baber/WOPTO huggingface dataset:
Patent KR-20010062454-A (KR)
Inventor: IWANE TOMOHIKO
IPC: H01L21/60
Filed: 2000-12-15
Abstract: PURPOSE: To prevent a wiring pattern from being hollowed without the increase of cost even if an outer connection terminal part is gold-plated. CONSTITUTION: The wiring pattern 4 of a tape carrier 16 in COF 15 gold-plates 6 a part which is not filmed by solder resist 10. The inner lead 14 of the tape carrier 16 and the gold bump 3 of the electrode 2 of a semiconductor element 1 are heated and pressurized. Gold and gold are press-contacted and joined. The inner lead 14 is penetrated into the gold bump 3 so as to join them.
Patent KR-20020051349-A (KR)
Title: compact sewage treament system for nutrient removal
Inventor: CHO GYU GAP
IPC: C02F3/08
Filed: 2000-12-22
Abstract: PURPOSE: Provided is a compact sewage treatment system for nutrient removal which is suitable for installation to the collective place of residence of medium-small size isolated from the large scale sewage treatment area. CONSTITUTION: The compact sewage treatment system comprises: an anoxic reactor(10) to the bottom of which an inlet pipe(14) is connected; a fluidizing biological media(11); a perforated plate(13) installed to prevent washing-out of fluidizing biological media and an agitator(12); an aeration tank(20) in which a blower(22) and an air compressor(23) are installed, and is packed with fixed biological media(21), and sends treated water to the anoxic reactor; a clarifier(30) which settles biological mass sloughed away from the biological media. The fluidizing media in which many denitrification bacteria are cultivated can remove two kind of pollutants at once and the material of that is 30-60PPI of polyether which has a zeolite or not. The packing ratio of the fluidizing biological media is 5-20% of the anoxic reactor and the fixed biological media is 10-30% of the aeration tank.
Patent KR-20020053142-A (KR)
Title: Non-return valve apparatus of engine oil
Inventor: HAN BYEONG HYEOK
IPC: F16K15/04
Filed: 2000-12-27
Abstract: PURPOSE: A check valve of an engine oil is provided to prevent the draining of an engine oil by surely closing a valve seat. CONSTITUTION: A check valve(1) is installed on an oil supply path(2). A valve seat(4) is prepared in a valve chamber(3). The valve seat is opened and closed by a ball(5). The ball is retained by a retainer(6). The retainer is supported on a return spring(7). Plate members(9) are connected to the lower ends of the retainer. A pad body(10) is attached to the plate member. A compressive spring(11) connects the end portion of the plate member with the upper portion of the retainer. The plate member is forced to be opened by the elasticity of the compressive spring. The pad body performs first sealing. The oil passing through the pad body is blocked up by the ball.
Patent KR-20020054123-A (KR)
Title: Memory cell test device
Inventor: CHOI HONG SEOK
IPC: G11C29/00
Filed: 2000-12-27
Abstract: PURPOSE: An apparatus for testing a memory cell is provided to store data to reduce a test time for a memory cell by using a redundancy array in order to store data to a sub bit line for redundancy. CONSTITUTION: A redundancy array(20) for redundancy memory cell is connected with a normal array(10) of a structure of hierarchical bit line in order to perform a memory repair operation. A switching portion(30) is used for connecting a sub bit line(RSBL) of the redundancy array(20) for redundancy memory cell with a bit line(BL) of the normal array(10). The switching portion(30) stores the same as data of the sub bit line(RSBL) or the data of opposite polarity to the data of the sub bit line(RSBL) by changing a voltage level of a particular bit of input addresses in an input process of an active command.
Patent KR-20020054232-A (KR)
Title: Rotating apparatus of a bucket for a loader
Inventor: LEE CHAN U
IPC: E02F3/345
Filed: 2000-12-27
Abstract: PURPOSE: A bucket operating device of a loader is provided to improve construction efficiency by shortening the time required for disposing of muck. CONSTITUTION: The loader(100) comprises: a car body(110) where an operator boards to operate a bucket(150); an axle frame(120) installed to the front of the car body to be movable vertically; a bucket(150) whose center is connected with the axle frame(120) to load muck; a joint member(160) installed to a contact part of the axle frame(120) and the bucket(150); a primary hydraulic device(130) operating the bucket(150) horizontally; and a secondary hydraulic device(140) connecting the car body(110) and the bucket(150) on the axle frame(120) to move the bucket(150) vertically on the joint member(160).
Patent KR-20010025504-A (KR)
Title: system of supplement and settlement for traffic fee using mobile communicator within IC card
Inventor: JUNG YEONG TAE
Filed: 2000-12-30
Abstract: PURPOSE: The system for paying and recharging transportation charge is provided to pay and recharge the transportation charge conveniently by using the mobile communication terminal with a built-in card IC. CONSTITUTION: The mobile communication terminal(100) has a card IC(110) built-in, which is a non-contact mode transportation card for using a public transportation. A recharging module(200) saves the transportation charge for a predetermined period in the non-contact mode card IC. Namely, the recharging module(200) saves a predetermined amount of money in the card IC(110) built in the mobile communication terminal(100) in accordance with a user's need. A calculating module(300) calculates the transportation charge spent by a user of the mobile communication terminal(100) having a card IC(110) built-in.
Patent KR-20020057161-A (KR)
Title: Drying system for evaporator using waste heat of coolant
Inventor: KANG BOK SEON
IPC: B60H1/00
Filed: 2000-12-30
Abstract: PURPOSE: A system for drying evaporator using waste heat of coolant is provided to keep an inside of an air conditioning case dry by drying the evaporator using waste heat of coolant after an engine stops. CONSTITUTION: A system includes a coolant bypass pipe(4) branching from a coolant circulation pipe(3) connecting a heater core(1) and an engine(2) to bypass coolant to an inlet tube(6) and an outlet tube(6a) of an evaporator(5); a heat exchange block(10) installed on the coolant bypass pipe having a space therein and penetrated by the inlet tube and the outlet tube; an engine driving detective device detecting operational condition of the engine; an air conditioner operational condition detective device detecting operational condition of an air conditioner; and a control device controlling a pump(8) installed on the coolant bypass pipe based on signal of the engine driving detective device and the air conditioner operational condition detective device to circulate coolant to dry condensed water formed on a surface of the evaporator by conductive heat generated by controlling the pump for fixed time to circulate coolant to the coolant bypass pipe so as to heat the inlet tube and the outlet tube of the evaporator when the air conditioner works and stop and then the engine stops.
Patent KR-20010023579-A (KR)
Title: 음성 통신에서 잡음 감소를 위한 채널 이득 변형 시스템및 방법
IPC: H04B15/00
Filed: 1997-09-30
Abstract: 본 발명은 음성 처리 시스템(108)에서 잡음을 억제하기 위한 시스템 및 방법에 관한 것이다.  이득 추정기(220)는 입력신호의 각 프레임에 대하여 이득 및 잡음 억제레벨을 결정한다.  만일 프레임에 음성이 존재하지 않는다면, 이득은 소정의 최소치로 설정된다.  프레임내에 음성이 존재한다면, 이득 조절기(224)는 미리 결정된 주파수 채널 세트의 각 채널에 대한 이득 인자를 결정한다.  각각의 채널에 대하여, 이득인자는 채널에서 음성의 신호대 잡음비(SNR)에 대한 함수이다.  채널 신호대 잡음비(SNR)는 에너지 추정기(206b)에 의해 제공된 채널 에너지 추정치와 잡음 에너지 추정기(214b)에 의해 제공된 채널 잡음 에너지 추정치에 기초하여 신호대 잡음비(SNR) 추정기(210b)에 의해 발생된다.  잡음 에너지 추정기(214b)는 음성 검출기(208)에 의해 결정되는 것처럼 음성이 존재하지 않는 프레임동안 그것의 추정치를 갱신한다.
Patent KR-20010023834-A (KR)
Title: 접지되고 직렬접속되고 스택된 ｆｅｔ쌍을 가지는 토템 폴믹서
IPC: H04B1/26
Filed: 1998-09-09
Abstract: 본 발명은 비선형 왜곡의 완전하거나 실질적인 상쇄를 하기 위하여 매칭되는 직렬쌍의 스위칭 장치(61,62)의 사용에 기인하여 부분적으로 폭넓은 동적 범위가 달성되는 높은 동적 범위믹서 장치(60) 및 믹싱 방법을 제공한다.  본 발명 구조 및 방법은 중간주파수(IF) 밸룬이나 무선주파수(RF) 밸룬중 어느것도 필요없이 직렬쌍의 배면접속된 FET의 보상 및 상쇄 메카니즘을 유지한다.  전형적으로 스위칭 장치는 소스-대-소스 접속된, 에를 들면 MESFET와 같은 FET(61,62)이며,  하나의 드레인 단자(D20는 접지되고 비접지되거나 유동적인 스위칭 신호는 공통 게이트 단자 및 공통 소스 단자 사이에 인가된다.
Patent KR-20010040269-A (KR)
Title: 어드레스 종속 명령을 갖는 경계 스캔 시스템
IPC: G01R31/3185
Filed: 1998-11-03
Abstract: 경계 스캔 집적 회로는 테스트 데이터 입력(TDI)(16) 및 테스트 데이터 출력(TDO)(18)의 2개의 전용 핀 사이에 복수개의 새로운 레지스터(56, 61, 62, 65, 67)를 설치한다. 상기 레지스터는 어드레스 레지스터(56) 및 상기 IR(23) 내의 어드레스 명령을 사용하는 어드레스 레지스터에 의해 어드레스된 복수개의 테스트 데이터 레지스터(61, 62, 65, 66, 67)를 포함한다. 상기 어드레스 가능한 레지스터에 대한 명령은 상기 TDI 및 TDO 핀 사이에 활성된 어드레스 종속 레지스터에 의하여 수행되는 상기 IR 내에 위치한 ADDLOAD 명령을 갖는 정확한 레지스터로 조정할 수 있다. 어드레스 종속 명령의 세트로부터의 어떤 명령은 많은 수의 어드레스 가능한 데이터 레지스터에 사용되는 작은 수의 명령을 허용하는 어드레스 종속 명령을 어떤 레지스터가 처리하도록 한다. 경계 스캔 레지스터(54)와 같은 어드레스 불가능한 레지스터는 어드레스 독립 명령에 사용한다.
Patent KR-20010032807-A (KR)
Inventor: ESCHENLAUER GEORGES
IPC: B29C48/345
Filed: 1998-11-11
Abstract: The present invention relates to foamed products and methods for producing them, comprising a plurality of coalesced extruded layers or layers of coalesced strands of a foamed thermoplastic composition having a low density, by (a) providing at least one foamable composition comprising at least one polymer or copolymer and a blowing agent formulation, (b) extruding the composition through a die having a plurality of orifices, (c) foaming the extruded composition at a foaming temperature which is above the glass-transition temperature or the melting temperature of the polymer composition, (d) maintaining the foaming product at an elevated temperature for a sufficient period of time to obtain adhesion between individual foam layers, and (e) allowing the foamed product to cool, characterized in that foamed product is obtained comprising a plurality of adherent foam layers, wherein at least one of these foam layers extends across the whole breadth of the foamed product.
Patent KR-20010015885-A (KR)
Title: 포스포노세펨 유도체, 그 제법 및 용도
IPC: A61K31/435
Filed: 1998-12-17
Abstract: 우수한 항균작용, 안정성, 경구흡수성을 가지는 식 
     
       
     
     [식중, R 1 은 포스포노기 또는 포스포노기로 변할 수 있는 기를, R 2 는 수소원자 또는 탄소원자를 통하여 결합하는 기를, Q 및 X 는 각각 질소원자 또는 CH 를 나타내고, Y 는 S, O 또는 CH 2 를 나타내고, n 은 0 또는 1 을 나타내고, R 3 및 R 4 중의 한쪽은 치환되어 있을 수도 있는 피리디늄기를, 다른 쪽은 수소원자 또는 치환되어 있을 수도 있는 탄화수소기를 나타내거나, 또는 R 3 및 R 4 는 서로 결합하여 4 급화된 질소원자를 함유하는 치환되어 있을 수도 있는 복소환을 나타낸다] 로 표시되는 화합물 또는 그 에스테르 또는 그 염인 신규 세펨 화합물, 그 제조법 및 이것을 함유하는 의약을 제공한다.
Patent KR-20010034254-A (KR)
IPC: C07D249/12
Filed: 1999-01-30
Abstract: Alkoxytriazolinones of the formula (I) [known for example as intermediates for preparing agrochemically active compounds]wherein R represents an alkyl group, an alkenyl group, an alkinyl group, a cycloalkyl group, a cycloalkylalkyl group, an aryl group or an arylalkyl group, any of which may be substituted, are prepared by reacting a) thioimidodicarboxylic diesters of the general formula (II)  wherein R is as defined above and R1 represents an alkyl group, an arylalkyl group or an aryl group, any of which may be substituted, with b) hydrazine, hydrazine hydrate or an acid adduct of hydrazine. The reaction is conducted i) in the presence of a diluent and, optionally, in the presence of a basic reaction auxiliary, and ii) at temperatures between -10 DEG  C. and +100 DEG  C.
Patent KR-20010082509-A (KR)
Inventor: GUYER CHARLES DAVID
IPC: C12Q1/68
Filed: 1999-01-28
Abstract: The present invention provides plant riboflavin biosynthesis genes, including a gene that encodes the beta subunit of the plant riboflavin synthase enzyme complex (lumazine synthase) and a gene that encodes the bifunctional enzyme GTP cyclohydrolase II/DHBP synthase. Also disclosed are the recombinant production of these plant riboflavin biosynthesis enzymes in heterologous hosts, screening chemicals for herbicidal activity using these recombinantly produced enzymes, and the use of thereby identified herbicidal chemicals to suppress the growth of undesired vegetation. Furthermore, the present invention provides methods for the development of herbicide tolerance in plants, plant tissues, plant seeds and plant cells using the riboflavin biosynthesis genes of the invention.
Patent KR-20010041088-A (KR)
Title: 아연-핑거 클래스의 ｄｎａ-결합 단백질의 디자인 방법
IPC: G06F17/50
Filed: 1999-02-19
Abstract: 본 발명은 어떤 예정된 타겟 이중-가닥 DNA 서열에 결합할 수 있는 DNA-결합 단백질(DBP)의 디자인에 관한 것이다.  단백질을 디자인하기 위한 규칙; 최적 DBP를 스크리닝하기 위한 알고리즘; 규칙과 알고리즘을 사용하는 컴퓨터 시스템; 단백질을 포함하는 일반식; 및 단백질 사용 방법을 개시한다.
Patent KR-20010041894-A (KR)
Title: 구강 내에서 급속히 붕괴되는 정제 및 이의 제조방법
IPC: A61K47/26
Filed: 1998-10-13
Abstract: 본 발명은 약물, 당류(A) 및 비결정성 당류(B)를 포함하고 성형후 가습 건조시킨, 구강 내에서 급속히 붕괴되는 정제에 관한 것이다.  상세하게는, 본 발명은 약물, 당류(A) 및 비결정질이 될 수 있는 결정 상태의 당류를 의약적으로 허용되는 용매에 용해시키고 당해 용액으로부터 용매를 제거하고 건조시켜 수득된 비결정성 당류(B)로 이루어진 혼합물을 성형한 후 가습 건조시킨, 구강 내에서 급속히 붕괴되는 정제에 관한 것이다. 
     본 발명의 정제는 제조 공정에서 가습 건조 공정후, 비결정성 당류가 결정 상태로 비가역적으로 변화하고, 보존시 습도에 대하여 안정하고, 또한 정제 강도를 안정하게 유지할 수 있다.  또한, 본 발명의 정제에 있어서는, 본 발명의 당류와 비결정성 당류를 1종류의 당류로부터 제조하는 것도 가능하기 때문에, 약물의 안정성을 고려한 제제 설계가 가능하다.  또한, 본 발명의 정제에 있어서는, 통상의 과립기와 타정기를 사용하는 제조방법을 제공하는 것이 가능하다.
Patent KR-20010043586-A (KR)
Title: 종양괴사인자 수용체 방출효소 활성에 영향을 주는 요인
IPC: A61K38/00
Filed: 1999-05-14
Abstract: 시토킨 TNF의 생물학적 효과는 세포의 표면상에서 수용체에 결합함으로써 매개된다. 이 개시는, TNF 수용체의 효소적 개열과 방출을 촉진하는 새로운 단백질과 폴리뉴클레오티드를 기술한다. TNF 수용체 쉐딩에 영향을 주는 부가적인 화합물들을 확인하는 방법이 또한 제공된다. 약제학적 조성물안의 활성성분으로서, 본 발명의 생성물은 TNF 신호전달을 증가시키거나 감소시켜 질병의 병리를 완화시킨다.
Patent KR-20020068647-A (KR)
Title: Wall structure of PCB through-hole and wall structure of PSGA stud
Inventor: BAEK YEONG HWAN
IPC: H05K1/11
Filed: 2001-02-21
Abstract: PURPOSE: A wall surface structure of through hole of printed circuit board and stud of polymer stud grid array(PSGA) is provided to improve performance of product and reduce deflective ratio by increasing a bonding force between the stud and metal. CONSTITUTION: A wall surface structure of through hole is characterized in that the through hole of a printed circuit board(16) has a wall surface(12) having a diameter gradually decreasing as it goes from the top to the bottom, such that the wall surface is inclined with respect to an ion beam(10) radiating downward. The wall surface has a slope angle(θ) of 10 to 89° with respect to the perpendicularity of the bottom surface. A wall surface structure of stud is characterized in that the stud has a wall surface decreasing as it goes from the bottom to the top, such that the wall surface is inclined with respect to the ion beam radiating downward.
Patent KR-20020068872-A (KR)
Title: Hand-free apparatus of moving communication terminal using car audio
Inventor: EUM SANG SUB
IPC: H04B1/38
Filed: 2001-02-23
Abstract: PURPOSE: A handsfree device for a mobile communication terminal using a car audio is provided to perform a telephone conversation using a handsfree through the car audio according to the operation of a user by forming an installing portion for installing the mobile communication terminal in a control panel installed in the car audio and connecting an earphone/microphone jack of the mobile communication terminal to an internal portion of the car audio through an earphone/microphone plug. CONSTITUTION: A mobile communication terminal installing portion(41) is formed in a control panel(40), and a mobile communication terminal body(10) is installed in the mobile communication terminal installing portion(41) by a mount and dismount type. A microphone(14) inputs a voice signal of a user. An earphone/microphone plug connects to a car audio body(30) or the control panel(40), and is inserted into an earphone/microphone jack composed in the mobile communication terminal body(10) for inputting a telephone conversation voice signal of the mobile communication terminal body(10) and a reproduction voice signal of an MP3 to the car audio body(30) or the control panel(40) and inputting the voice signal of the microphone(14) to the mobile communication terminal body(10). A control circuit controls the car audio body(30) so that the car audio body(30) selects and outputs the voice signal inputted from the mobile communication terminal body(10) to the car audio body(30) or the control panel(40) through the earphone/microphone plug.
Patent KR-20020069050-A (KR)
Title: Hexahedral Finite Element Mesh To Control The Element Size Modelling Method And Storage Medium Thereof
Inventor: LEE YEONG GYU
IPC: G06T17/20
Filed: 2001-02-23
Abstract: PURPOSE: A hexahedron finite element modeling method for controlling an element size and a recording medium of a modeling system are provided to model a hexahedron finite element more efficiently. CONSTITUTION: A hexahedron is modeled into a face contact unit element network in a manner that one face of the hexahedron is divided into four and the opposite face is divided into sixteen(S100). The hexahedron is modeled into a corner contact unit element network that shares two faces of the face contact unit element network in a manner that the edge of one face of the hexahedron is bisected and the diagonally opposite edge is divided into four(S200). The hexahedron is modeled into a point contact unit element network that shares three faces of the corner contact unit element network in a manner that each of three faces coming into contact with one another having one point of the hexahedron in the center is divided into four and a partial region of each of three faces coming into contact with one another having the diagonally opposite point in the center is divided into four(S300).
Patent KR-20020069384-A (KR)
Title: Method for controlling torque of gripping device using an electric motor
Inventor: LEE SANG SIK
IPC: B25J9/18
Filed: 2001-02-26
Abstract: PURPOSE: A motor for controlling a torque of a gripping apparatus using a motor is provided to grip stably an article by flowing a high current at a grip completing step and increasing temporarily a gripping force of a grip. CONSTITUTION: A gripping apparatus comprises a grip(3) for gripping directly an article, a grip apparatus(1) including a motor(4) for controlling the grip, and a current controller(6) for controlling an operation of the grip apparatus. The grip apparatus(1) is composed of a grip(3) for gripping the article by a compressed force, a ball screw(5) and the motor for guiding a rotation movement of the ball screw. The ball screw is coupled at a rear side of the grip, and performs a finger closing operation for gripping the article and a finger opening operation. The current controller comprises a speed sensing and current command generator(7), a current control algorithm portion(8) and a current amplifier(9).
Patent KR-20020069874-A (KR)
Title: A guard of rubber tube for coupling tube
Inventor: LEE EUN KYUNG
IPC: F16L25/04
Filed: 2001-02-28
Abstract: PURPOSE: A rubber tube protecting member used for jointing pipes is provided to safely protect a joint section of a pipe and to prevent the rubber tube from being broken. CONSTITUTION: A rubber tube used for jointing a metal pipe is surrounded by a protecting cover(1) and a coupling member(4), so that the rubber tube is prevented from being broken with maintaining a sealing state in a joint portion of the metal pipe. The protecting cover(1) has a width identical to or larger than a width of the rubber tube and has a predetermined length enough to completely surround the rubber tube. A corrugated section(11) is formed in the protecting cover(1) when rolling the protecting cover(1). The coupling member(4) includes a coupling strip(5), two shafts(6,6') coupled to both ends of the coupling strip(5), a fixing bolt(7) coupled to the shafts(6,6') and an auxiliary strip(8).
Patent KR-20020071405-A (KR)
Title: plate assembly and apparatus having the same
Inventor: AHN GYE TAEK
IPC: H01L21/687
Filed: 2001-03-06
Abstract: PURPOSE: A plate assembly and a processing apparatus having the same are provided to minimize an aligning error of a wafer by providing vacuum atmosphere of a process chamber to a back side of the wafer. CONSTITUTION: A plate assembly(32) includes a pad(32a) and a plate(32b). The pad(32a) has recesses. The recesses have a shape of groove. A vacuum atmosphere of a process chamber is provided by the recesses of the pad(32a). The vacuum atmosphere is provided to a back side of a wafer loaded on the plate assembly(32). The plate assembly(32) has a disc shape. A diameter of the plate assembly(32) is larger than the diameter of the wafer. The pad(32a) is formed by rubber material. A silicon material can be added into the pad(32a). A robot arm transfers the wafer from the outside of a process chamber to the plate assembly(32) or the plate assembly(32) to the outside of the process chamber.
Patent KR-20020071526-A (KR)
Title: A sound absorption panel assembly
Inventor: HAN GEUN SEON
IPC: E04B1/86
Filed: 2001-03-07
Abstract: PURPOSE: A noise absorbing panel assembly is provided to effectively remove noise reflected and propagated into different directions within a closed space such as a subway tunnel, and to improve durability thereof. CONSTITUTION: The noise absorbing panel assembly comprises a front surface case(100), a rear surface case(200), and a noise absorbing member(300). The front surface case is formed with upper and lower noise absorbing holes(110,120) and left and right noise absorbing holes(130,140). A horizontal outer surface(150) and a longitudinal outer surface(160) are formed around the edge of the front surface case to form the side surfaces of the panel assembly. The rear surface case is formed with horizontal and longitudinal sections(250,260) corresponding to the horizontal and longitudinal outer surfaces. For the fastening of the front and rear surface cases, fastening holes and fastening pieces are formed on the sections and the outer surfaces. Also, the rear surface case has horizontal and longitudinal partitions(210) to define a plurality of noise spaces(230) therein. The noise absorbing member is filled in the noise spaces.
Patent KR-20020071634-A (KR)
Title: A purification method of pravastatin precursor compactin and derivatives thereof using HP20 resin and ethanol
Inventor: CHA JE UK
IPC: C12P17/06
Filed: 2001-03-07
Abstract: PURPOSE: A purification method of pravastatin precursor compactin and derivatives thereof is provided particularly by absorption chromatography using ethanol and HP20 resin. CONSTITUTION: The purification method of pravastatin precursor compactin and its derivatives comprises the steps of: fermenting strains which produce compactin and its derivatives in order to obtain a fermentation solution; performing absorption chromatography with the fermentation solution using ethanol and HP20 resin; and recovering pravastatin precursor compactin and its derivatives by using ethanol, wherein the absorption chromatography is performed at 0-20% of the ethanol content in absorption solution with maintaining the ethanol content in eluting solution to 60% or more.
Patent KR-20010091948-A (KR)
Title: Process for the production of alpha-tocopherol acetate by condensation of trimethylhydroquinone with isophytol with recycling of an acetic catalyst solution
Inventor: HUTHMACHER KLAUS
IPC: C07D311/72
Filed: 2001-03-09
Abstract: PURPOSE: A method for preparing alpha-tocopherol acetate is provided by condensing trimethylhydroquinone with circulated acetic catalyst solution. CONSTITUTION: In the method for the production of alpha-tocopherol acetate in a recirculating process by condensation of trimethylhydroquinone and isophytol in the presence of a catalyst system consisting of a zinc halide and an aqueous protonic acid and optionally an elemental metal in a polar solvent/water mixture extractable or miscible with water, the alpha-tocopherol initially obtained is separated from the aqueous catalyst phase and esterified with an acylating agent, the solution of the catalysts obtained after working up by aqueous extraction is regenerated and the solution containing acetic acid is returned to the reaction and the catalyst mixture comprising zinc halide and protonic acid is concentrated and reintroduced into the reaction in liquid form.