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Process for preparation of high purity methacrylic acid

A technology of pure methacrylic acid and methacrylic acid, which is applied in the direction of carboxylate preparation, carboxylate preparation, chemical instruments and methods, etc., and can solve the problems such as the decrease of methacrylic acid yield

Active Publication Date: 2014-08-13
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, by C 4 The known method for producing pure methacrylic acid has the disadvantage that, in addition to the extraction step, at least two additional distillation steps are required in order to separate low-boiling and high-boiling impurities
Since methacrylic acid tends to form methacrylic acid dimers, methacrylic acid oligomers and methacrylic acid polymers under thermal load, each additional distillation step results in the formation of dimers, oligomers or polymeric lead to a decrease in the yield of methacrylic acid

Method used

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  • Process for preparation of high purity methacrylic acid
  • Process for preparation of high purity methacrylic acid
  • Process for preparation of high purity methacrylic acid

Examples

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Effect test

Embodiment 1

[0124] use figure 1 The device, the difference is that instead of column 17, use figure 2 The column (column 32) serves as the distillation column of the purification unit. The salt bath temperatures of the first and second reaction tubes were 360°C for the first reactor and 300°C for the second reactor, respectively. Isobutene (5 vol.%) was oxidized in two steps with air (85 vol.%) and water (10 vol.%) to form a reaction product containing methacrylic acid in the gas phase. This reaction product is condensed in a quench column to form an aqueous methacrylic acid solution and then separated from low boiling components in a first distillation column. An aqueous methacrylic acid solution having the composition given in Table 1 without the methacrylic acid component (in which the total weight including methacrylic acid adds up to 100 wt. %) was obtained. Methacrylic acid is extracted from aqueous methacrylic acid with n-heptane, as described in EP 0 710 643 A1. The resultin...

Embodiment 2

[0130] use figure 1 The device, and the crude methacrylic acid side inlet and the pure methacrylic acid side outlet at similar heights in the rectification column.

[0131] Methacrylic acid having a composition according to Table 2 was withdrawn continuously at the side outlet for pure methacrylic acid.

Embodiment 3

[0133] This example corresponds to example 1, wherein aminoguanidine bicarbonate (1000 ppm) was added to the reflux of the rectification column. Methacrylic acid having the composition of Table 2 was withdrawn continuously at the top of the column.

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Abstract

The present invention relates to a method for preparing pure methacrylic acid, which at least comprises the following process steps: a) gas-phase oxidation of C4 compounds to obtain a gas phase containing methacrylic acid; b) condensing the gas phase containing methacrylic acid to obtain methacrylic acid an aqueous solution; c) separating at least a portion of methacrylic acid from an aqueous solution of methacrylic acid to obtain at least one crude methacrylic acid-containing product; d) separating by thermal separation from at least one crude methacrylic acid-containing product at least a portion of methacrylic acid to obtain pure methacrylic acid. The present invention also relates to the high purity methacrylic acid obtainable by this method, the method for preparing methacrylate, the methacrylate obtainable by this method, the method for preparing polymethacrylic acid, by this method Polymethacrylic acid obtained by the method, method for preparing polymethacrylate, polymethacrylate obtained by this method, pure methacrylic acid obtainable by the method of the invention and obtainable by the method of the invention Uses of methacrylates, as well as fibers, films, varnishes, coatings, molding materials, shaped bodies, paper additives, leather additives, flocculants and drilling additives.

Description

technical field [0001] The present invention relates to a method for preparing pure methacrylic acid, high-purity methacrylic acid obtained by this method, a device for preparing methacrylic acid, a method for preparing methacrylate, methacrylate obtained by this method, preparation Method for polymethacrylic acid, polymethacrylic acid obtained by this method, method for preparing polymethacrylate, polymethacrylate obtained by this method, pure Uses of methacrylic acid and methacrylates obtained by the process according to the invention, as well as fibres, films, varnishes, coatings, molding materials, shaped bodies, paper additives, leather additives, flocculants and drilling additives. Background technique [0002] Methacrylic acid ("MAA") and methacrylates, such as methyl methacrylate ("MMA") and butyl methacrylate, and polymeric materials including them are used in a wide variety of applications. Typical end-use applications include acrylic plastic profiles and sheet, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/05C07C57/055C07C57/07C07C69/54C07C67/08C08F20/06C08F20/18
CPCC07C51/252C07C67/08C07C51/43C07C51/48B01D3/14C07C51/44Y02P20/582C07C57/04C07C69/54
Inventor M·克斯特纳G·克尔布尔R·迈尔
Owner ROHM G M B H
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