Patent GB-190705542-A (GB)
Title: Method of Producing an Arbutin Derivative
Inventor: VILMAR CARL
Filed: 1907-03-07
Granted: 1907-06-06
Abstract: 5542. Vilmar, C. March 7. Monobenzoylarbutinis prepared by the action of benzoyl chloride on arbutin, or vegetable extract of arbutin. According to an example, the leaves of the bear-berry (urva ursi) are repeatedly extracted with water at 60-75‹ C., and the extract is evaporated down and treated with subacetate of lead. The liquid is separated from the precipitate produced, and the lead is removed by means of potassium carbonate. The liquor, which is then separated, is treated with successive small quantities of benzoyl chloride, after the addition of each of which the mixture is neutralized. From the resultant mixture, monobenzoylarbutin is precipitated as a white powder, and is collected, washed, and dried. It may then be recrystallized from boiling water. 5545. Bonallo, K. March 7. Acetylene.-The carbide container D is riveted to a base E which is connected to a lower casing K by a gas-tight joint F. The gasholder G has liquid seals K<1>, R<3>, guide-pulleys a having rubber tyres, liquid buffers comprising a cylinder X filled with glycerine and a piston Y, an outlet tube 30, and two rods R supporting a cross-head 3 which passes out of the casing K through slots K<2>, K<3>. The cross-head 3 is attached to the square end of a rod 2 which carries a tappet frame V and a tube D' within the carbide container. The frame V has tappets S which actuate levers 17, when the gas bell falls, whereby two rods T are raised ; these rods in turn raise rods U arranged to disturb the carbide upwardly and slightly centrally. The combined effect of the fall of the tube D<2> and the rise of the rods U when the gas-bell falls is to cause some carbide to fall down through the tube D<2> on to a perforated plate A<2>. Packing is provided at F<1> in the bearings of the tubes D<2> and the rods U to prevent undue wear by minute carbide crystals. The rods U are controlled by weak springs V<1> and several such rods may be used connected to yokes U<1>. Springs 15 prevent the levers 17 from moving too far and out of the operating position. The acetylene generated escapes through a slot Z and up a space R<1> into the gas-bell G. A cleaning snug Z<1> is attached to the cross-head 3. A bottom guide 1 is provided to reduce the free surface of the water and thereby to minimize the disturbing influence of the vibrations thereof. For the same purpose and also for confining the reaction to a small volume of water whereby the heat of reaction prevents the water from freezing, the water chamber M is made conical as shown. A sludge door 11 is hinged at 14 and is operated by a chain 8 ; a perforated check door 12 is arranged in connexion therewith to prevent the entrance of weeds or other obstructions. A tube 6 serves to fill or empty the seal K<1>. A tube 7 is provided for throwing down a small quantity of carbide for generating sufficient gas so raise the bell G before the cap Q is opened for recharging the carbide container. The carbide used is previously soaked in a non-viscous and non-freezable oil. The tube D<2> connects with the frame V by parallel flat flanged faces so that the tube can be disconnected by sliding it sideways, when the container D and base E are detached and lifted up. The outlet tube 30 from the gas-holder connects through a telescopic glycerine seal 0 and a flexible tube to the lamp P. A tubular shield d prevents any water that may enter the gallery B from finding its way to the seal O. The seal O acts also as an indicator of the height of the gas-bell. A safety escape device is provided, consisting of a tube 33 dipping below glycerine in a closed chamber c and a tube 34 rising therein above the level of the glycerine.