METHOD FOR MODIFYING WASTE IN ISOPRENE MANUFACTURING Russian patent published in 2005 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to chemical modification of dioxane alcohols and their mixture with their esters and formals that are waste in manufacturing isoprene and used, in particular, as a secondary plasticizing agent in manufacturing polyvinyl chloride compositions. As a modifying agent method involves using at least one substance taken among the group including cyclic anhydride (preferably maleic anhydride, phthalic anhydride, phosphoric anhydride, succinic anhydride, waste in manufacturing phthalic anhydride) or cyclic amide (preferably caprolactam, butyrolactam) taken in the mass ratio alcohol (or mixture of alcohols with esters and formals):modifying agent = (0.56-400):1. Treatment is carried out at temperature 100-180°C for 2-6 h. Invention provides increasing yield of product, replacing high-expensive raw for inexpensive and more available raw, reducing temperature of the process, reducing acid number and the content of volatile impurities in the end product.

EFFECT: improved modifying method.

3 cl, 4 tbl, 12 ex