METHOD OF PRODUCING ESTERS OF DICARBOXYLIC ACIDS C-C AND ALCOHOLS C-C Russian patent published in 2009 - IPC C07C69/02 C07C67/03 C07C69/34 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing esters through etherification of a mixture of mono- and dicarboxylic acids C₂-C₆ (containing 53 to 60% adipic acid), obtained from evaporating acid waste water from caprolactam production, on acid catalysts in the presence of a third component (benzol) at temperature ranging from 80 to 90°C until release of water stops completely, with subsequent neutralisation of the catalyst and unreacted acid, washing with water from the formed salts, separation of the organic layer from water, extraction of the product through distillation, consisting of a distillate of the benzol fraction, distillate of the alcohol fraction, vacuum distillation of highly volatile esters, thereby obtaining a product as vat, where the etherifying agent used is cyclohexyl alcohol (at least 99.8% purity) or an alcohol fraction which contains 70 to 75% mixture of amyl, isoamyl and cyclohexyl alcohols, also a waste product from caprolactam production. The desired product, which is a mixture of esters, has good plasticising properties, flash point≥185°C; can be used as plasticiser for PVC compositions, rubber products in place of EDOS (3^rd class of hazard) and dioctylphthalate (3^rd class of hazard dioctylphthalate).

EFFECT: considerably low cost price, 4^th class of hazard.

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