Process and apparatus for producing diglycerin

Details Process and apparatus for producing diglycerin Process and apparatus for producing diglycerin

1995-02-24

1996-04-23

Evans, Joseph E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

422193, C07C 4102, C07C 4310, B01J 1400

Patent

active

055105424

ABSTRACT:
A process for producing diglycerin having a low content of cyclic components by reacting glycerin with epichlorohydrin by a continuous process in which the epichlorohydrin required for the reaction is introduced into at least one flow reactor at several separate spots or reaction zones mutually separated in space in the direction of flow; the reacted reaction mixture is substantially freed of excess glycerin in at least one evaporator; the remaining chlorohydrin/ether mixture is hydrolyzed in at least one first step with a 5 to 40 mole % excess alkali carbonate solution, calculated with respect to organically bound chlorine in the chlorohydrin ether, at a pH of 6.5 to 9.5, and hydrolysis is at least substantially completed in a second step with an alkali hydroxide at a pH above 10; the resulting hydrolyzed crude product solution is adjusted to a pH of 5.5 to 8 with a mineral acid, preferably hydrochloric acid; and the resulting solution is condensed, precipitating salts are removed, and the diglycerin solution containing less than 8% by weight residual inorganic salts is freed of cyclic diglycerin and residual glycerin in a flash evaporator. Apparatus for carrying out the foregoing method is also disclosed.

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