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Process for preparation of highly pure, non-yellowing (meth)acrylic acid

An acrylic acid, high-purity technology, applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of high residual monomer concentration, prolonged initiation period, and no production of acrylic acid

Active Publication Date: 2014-12-10
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of mercaptans during the methacrylate production process always carries the risk of problems such as prolonged initiation periods or high residual monomer concentrations during downstream polymerization
[0007] None of the above examples of the prior art resulted in a truly long-term color stable (meth)acrylic acid

Method used

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  • Process for preparation of highly pure, non-yellowing (meth)acrylic acid
  • Process for preparation of highly pure, non-yellowing (meth)acrylic acid
  • Process for preparation of highly pure, non-yellowing (meth)acrylic acid

Examples

Experimental program
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Embodiment 1

[0051] This example was carried out analogously to comparative example 2, except that, instead of filtration after the ion exchange treatment, distillation was carried out according to method step e).

Embodiment 2-4

[0055] These examples were carried out according to Example 1, however, with different ratios of methacrylic acid to ion exchanger as shown in Table 2.

Embodiment 5-6

[0059] These examples were carried out according to Example 1, however, with the ion exchange treatment temperatures indicated in Table 3.

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Abstract

This invention relates to a process of preparing highly pure, non-yellowing (meth)acrylic acid necessary for high-tech applications requiring long-term color stability in the presence of amines. Process for the preparation of highly pure, non-yellowing (meth)acrylic acid comprising the steps: f) condensation of a (meth)acrylic acid- containing gas phase obtained via a gas phase oxidation process of a C4-compound to generate an aqueous (meth)acrylic acid solution g) separation of the (meth)acrylic acid from the aqueous (meth)acrylic acid solution to obtain crude (meth)acrylic acid h) rectification of the crude (meth)acrylic acid to obtain pure (meth)acrylic acid via a sidestream outlet of the rectification column i) treatment of the pure (meth)acrylic acid generated in step c) with an ion exchange resin j) distillation of the (meth)acrylic acid generated in step d).

Description

technical field [0001] The present invention relates to the preparation of high purity non-yellowing (meth)acrylic acid required for high technology applications requiring long-term color stability. Background technique [0002] Various methods of preparing methacrylic acid are known in the art. In addition to synthetic routes starting from C2 or C3 sources, the ACH method and C 4 The heterogeneously catalyzed gas-phase oxidation of compounds such as isobutene, tert-butanol, methacrolein or isobutyraldehyde is also widely used in practice. In particular, in the C 4 Process Aldehydes formed as by-products in the production of methacrylic acid (absorbing in the UV range, even at very low concentrations) lead to undesired yellowing, which generally also leads to unacceptable coloring of the resulting applications. The degree of coloration of a liquid is usually quantified by means of the APHA value, which is often determined by ASTM standard D 1209 or via DIN ISO 6271. Meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/43C07C51/44C07C51/47C07C51/48C07C57/04
CPCC07C51/21C07C51/43C07C51/44C07C51/47C07C51/48C07C57/04
Inventor 张正风G·克尔博L·萨托雷利H·希尔特王汇晟M·米尔寇
Owner ROHM G M B H
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