Patent ID: 6787001
Filing Date: 2004-09-07
Classification: B01D,C07C,Y10S

Abstract:
A method for distilling a raw material liquid containing (meth)acrylic acid free from azeotropic solvents, which comprises;subjecting gas phase catalytic oxidation reaction of propylene and/or acrolein with a molecular oxygen-containing gas or by gas phase catalytic oxidation reaction of at least one selected from the group consisting of isobutylene, t-butyl alcohol and methacrolein with the molecular oxygen-containing gas to form a mixed gas; feeding the resulting mixed gas to a (meth)acrylic acid collection column wherein materials containing (meth)acrylic acid are collected with a collection agent to form the raw material liquid containing (meth)acrylic acid free from azeotropic solvents; feeding to a distillation column the raw material liquid containing (meth)acrylic acid free from azeotropic solvents which temperature is substantially equal to that of an entrance place in the column; and distilling the raw material liquid in the distillation column, wherein the temperature of the raw material liquid is adjusted by heating or cooling.