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
CN101456807BActive Publication Date: 2012-07-11SHANGHAI HUAYI NEW MATERIAL
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI HUAYI NEW MATERIAL
Publication Date
2012-07-11

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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