PREPARATION OF CITRACONIC ANHYDRIDE

Title:

PREPARATION OF CITRACONIC ANHYDRIDE

Document Type and Number:

Japanese Patent JPH07247277

Kind Code:

A

Abstract:

PURPOSE: To obtain citraconic anhydride in a single step without a problem of adjusting temperature in good yield and without causing polymerization by heating itaconic acid in the presence of a specific catalyst.

CONSTITUTION: For example, in a reaction solvent such as (pseudo)cumene, (A) itaconic acid is added with 0.1-30 (wt.)% (preferably 1-4%), based on component (A), catalyst of an at least partially organic acid/base type having a pKa of 4-10 (preferably 5-9) and a melting point of lower than 200°C (preferably not higher than 180°C) (suitable examples being pyridium p-toluenesulfonate, pyridium itaconate or the like) and heated to 130-180°C (preferably 150-170°C), and the water formed is removed by azeotropic distillation during the reaction to obtain citraconic anhydride.

Inventors:

MISHIERU ARASU
ARAN SHIJISUMONDEI
FUIRITSUPUUJIYAN TEIRERU

Application Number:

JP1184195A

Publication Date:

September 26, 1995

Filing Date:

January 27, 1995

Export Citation:

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Assignee:

RHONE POULENC CHIMIE

International Classes:

C07D307/60; B01J31/02; C07B61/00; C07C51/56; (IPC1-7): C07D307/60; B01J31/02

Attorney, Agent or Firm:

Yoshio Kawaguchi (2 outside)

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