Patent RU-2515993-C2 (RU)
Inventor: DJUKS ANDRE
IPC: C07C68/08
Filed: 2009-06-19
Granted: 2014-05-20
Abstract: FIELD: chemistry.SUBSTANCE: invention relates to method of obtaining at least one diarylcarbonate of general formula(I), in which R, R' and R" independently on each other stand for hydrogen atom, non-branched or branched alkyl with 1-34 carbon atoms, alkoxy with 1-34 carbon atoms, cycloalkyl with 5-34 carbon atoms, alkylaryl with 7-34 carbon atoms, aryl with 6-34 carbon atoms or halogen atom, and R, R' and R" in both parts of formula (I) can be similar or different, and R can also represent group -COO-R'", in which R'" can stand for hydrogen atom, non-branched or branched alkyl with 1-34 carbon atoms, alkoxy with 1-34 carbon atoms, cycloalkyl with 5-34 carbon atoms, alkylaryl with 7-34 carbon atoms or aryl with 6-34 carbon atoms, at least, of one dialkylcarbonate and from at least one aromatic hydroxycompound of general formula(III), in which R, R? and R" independently on each other have above mentioned values, and (a) dialkylcarbonate(s) in presence of at least one catalyst of re-etherification interact(s) with aromatic hydroxycompound(s) in first reaction column with at least one strengthening zone, located in its upper part, below which located is at least one reaction zone, consisting of at least two sections, (b) bottom product from first reaction column is supplied in at least one other reaction column with at least one strengthening zone, located in its upper part, below which located is at least one reaction zone, and subjected to further conversion, (c) unconverted or formed during reaction in reaction columns technological stages (a) and/or (b) dialkylcarbonate is fully or partially separated from formed during reaction alkyl alcohol at least one other technological stage, provided with at least one distillation column, (d) vapour, removed from upper part of at least one reaction column of technological stage (b) and containing aromatic hydroxycompound(s) is fully or partially supplied to at least one other provided with at least one distillation column technological stage, at which separated are compounds with temperature of boiling lying in the interval between the points of boiling of dialkylcarbonate and formed in the process of obtaining alkylarylcarbonate diarylcarbonate of general formula(IV), in which R, R' and R" independently on each other have above mentioned values, and Ris non-branched or branched alkyl with 1-34 carbon atoms and (e) diarylcarbonate-containing bottom product of other(s) reaction column(s) of technological stage (b) is supplied to at least one other technological stage for purification in at least one distillation column with at least one strengthening zone in upper part and with at least one stripping zone in the bottom part, and at least one reaction column, selected from group, including first reaction column and other reaction column(s), is provided with one or several condensers, and heat of condensation, realised in condenser(s) is directly or indirectly returned into technological process, and heat of condensation, realised in condenser(s) of other(s) reaction column(s) is directly or indirectly used for separation of dialkylcarbonate from alkyl alcohol, formed during reaction and/or for evaporation of dialkylcarbonate, directed into first reaction column, and working pressure in separating distillation column(s) of technological stage of dialkylcarbonate and alkyl alcohol separation is set in such a way that temperature of evaporation in boiler of separation distillation column(s) of technological stage of dialkylcarbonate and alkyl alcohol separation is below condensation temperature in condenser(s) of other(s) reaction column(s) and/or if necessary present intermediate condenser(s) of first reaction column.EFFECT: method makes it possible to optimise internal application of heat energy in efficient way.17 cl, 14 dwg, 1 ex