Method for producing (methyl) acrylic acid

A technology of acrylic acid and methyl, which is applied in the fields of oxidative preparation of carboxylic acid, organic chemistry, etc., can solve the problems of difficulty in maintaining the operating temperature of the tower, restricting the processing capacity of the whole tower, and reducing the flux of the stripping section, etc., to achieve increased thickness, large The effect of improving throughput and processing capacity

Active Publication Date: 2012-07-11
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-pore sieve plate structure is adopted in the stripping section because the concentration of acrylic acid in the stripping section is high and it is easy to polymerize. The pressure drop is high, and the operating temperature of the tower bottom is difficult to maintain in a low range, which cannot fundamentally solve the problem of polymerization of acrylic acid at the bottom of the tower

Method used

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  • Method for producing (methyl) acrylic acid
  • Method for producing (methyl) acrylic acid
  • Method for producing (methyl) acrylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, and the stripping section adopts vertical sieve plates. And holes are opened on the upper part of the vertical sieve plate mass transfer unit to further reduce the pressure drop of the device. The vertical sieve plate in this embodiment can prevent a small amount of acrylic acid polymer that may be produced in the stripping section from clogging the tray, and it is also easy to remove if a small amount of polymer is generated. The height of the overflow weir is 10 mm.

[0029] The acrylic acid aqueous solution containing 45% (mass) acrylic acid, 2% (mass) acetic acid and a small amount of formic acid and formaldehyde is continuously entered into the acrylic acid aq...

Embodiment 2

[0031] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, and the stripping section adopts guided valve trays. At the same time, in order to enhance the gas-liquid mass transfer effect, the height of the overflow weir on the guide valve tray is 10mm. The guide valve tray in this embodiment can prevent a small amount of acrylic acid polymer that may be generated in the stripping section from clogging the tray, and it is also easy to remove if a small amount of polymer is generated.

[0032] The acrylic acid aqueous solution containing 45% (mass) acrylic acid, 2% (mass) acetic acid and a small amount of formic acid and formaldehyde is continuously entered into the acrylic acid aqueous rectification tower, and the tower is f...

Embodiment 3

[0034] The acrylic acid aqueous solution distillation tower adopts the vacuum azeotropic distillation method, the height of the tower is 20000mm, and the diameter of the tower is 1500mm. In this embodiment, the upper part of the rectification section of the rectification tower adopts corrugated ceramic packing with a porosity of 75%, the lower part of the rectification section adopts co-current injection packed trays, and the stripping section adopts vertical sieve trays. And holes are opened on the upper part of the vertical sieve plate mass transfer unit to further reduce the pressure drop of the device. At the same time, in order to enhance the effect of gas-liquid mass transfer, the height of the overflow weir is increased to 15mm. The co-current injection packed trays of this embodiment can prevent the small amount of acrylic acid polymers that may be produced in the rectification section from clogging the trays, and if a small amount of polymers are generated, it is also...

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Abstract

The invention provides a method for producing (methyl) acrylic acid. The method comprises: selecting at least one of C3 compounds such as propane, propylene, isopropanol, glycerin and acrolein, or at least one of C4 compounds such as isobutene, isobutene, tertiary butyl alcohol and acrylaldehyde as raw materials to carry out catalytic oxidation to prepare a gas mixture containing the (methyl)acrylic acid; absorbing the gas mixture, and separating the (methyl)acrylic acid water solution, wherein a rectifying section of a rectifying tower separating the (methyl)acrylic acid water solution adopts regular packing or parallel-current jet packing trays, or the upper part of the rectifying section adopts the regular packing and the lower part of the rectifying section adopts the parallel-current jet packing trays; and a stripping section adopts directed floating valve trays or vertical sieve trays, or the upper part of the stripping section adopts the directed floating valve trays and the lower part of the stripping section adopts the vertical sieve trays. The rectifying tower with combined tower internal structure embodies a concentrated reflection of the advantages of the regular packing, the parallel-current jet packing trays, the directed floating valve trays and / or vertical sieve trays in the same rectifying system, thereby effectively improving separating capability of the rectifying tower, lowering full-tower pressure drop and operational temperature, avoiding convergescence of the (methyl)acrylic acid at a high temperature, making the water content of tower-bottom discharged material reduced below 0.5 percent, the acetic acid content of the tower-bottom discharged material reduced below 2 percent and the (methyl)acrylic acid content of tower-top water phase reduced below 0.5 percent, further reducing unit consumption of the (methyl)acrylic acid products and improving product quality.

Description

technical field [0001] The present invention relates to a method for producing (meth)acrylic acid, in particular, the present invention relates to a novel rectification tower for separating (meth)acrylic acid in aqueous solution of (meth)acrylic acid, and the upper part of the rectification section of the rectification tower adopts Structured packing, the lower part of the rectification section adopts co-current jet packing trays, and the number of co-flow jet packing trays accounts for 20-80% of the total number of trays in the rectification section. The upper part of the stripping section adopts guided valve trays, and the lower part of the stripping section adopts vertical sieve trays, and the number of guided valve trays accounts for 20-80% of the total number of trays in the stripping section. Background technique [0002] It is well known that the method of producing (meth)acrylic acid consists of 3 At least one of the compounds propane, propylene, isopropanol, glycer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/04C07C57/05C07C57/07C07C51/16
Inventor 唐勇张春雷马建学邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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