Process for the preparation of metacru00eclico acid of high purity, metacru00eclico acid of high purity.Methods to prevent the decomposition of hiba within a stream containing acid metacru00eclico and acid catalyst.To remove a stream containing acid metacru00eclico hiba and to purify a stream of MAA containing hiba in a purification process

摘要

"Process for the preparation of metacru00eclico acid of high purity, metacru00eclico acid of high purity.Methods to prevent the decomposition of hiba within a stream containing acid metacru00eclico and acid catalyst.To remove a stream containing acid metacru00eclico hiba and to purify a stream of MAA containing hiba in a purification process.A process is provided in this report for the production of high yield of glacial methacrylic acid of high purity (hpmaa ') that is substantially pure, specifically 99% pure or more.With water content of 0.05% or less and low levels of other impurities, including hiba, acrylic acid, mompa, metacroleu00edna and others.This improved process comprises the supply of a current of MAA and the purification of the raw stream of crude methacrylic acid in a series of successive stages of distillation involving two COlunas distillation. The process of the invention is capable of producing the product of methacrylic acid of high purity is especially suitable for the production of polymers of MAA special.