Acrylic purification process and apparatus of bulkhead azeotropy rectification column

The technology of an azeotropic distillation column and a process method is applied in the field of purifying acrylic acid, which can solve the problems of high investment cost, equipment corrosion, complicated process and the like, and achieve the effect of saving equipment investment.

Inactive Publication Date: 2009-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of large amounts of inhibitors may completely prevent the polymerization of acrylic acid, but is not economically viable and creates problems such as equipment corrosion and waste water disposal
[0011] Among the above-mentioned patents, ...

Method used

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  • Acrylic purification process and apparatus of bulkhead azeotropy rectification column
  • Acrylic purification process and apparatus of bulkhead azeotropy rectification column

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: if figure 1 process shown. The next-wall azeotropic rectification column (1) adopts a tray column with a column diameter of 1200mm and a column height of 18000mm. The cross-sectional area ratio to the side rectification section (III) is 3.17:1. The vapor phase at the bottom of the next wall (5) flows into the stripping section (II) and the side line rectifying section (III) respectively in a certain proportion, and the ratio of the mass flow rate of the vapor phase entering the stripping section (II) and the side line rectifying section (III) is 3.38:1. With xylene as the entrainer, the acrylic acid aqueous solution containing acetic acid impurities as the raw material enters the tower from the 14th plate (numbered from top to bottom, the same below) at the bottom of the rectification section (I), and the supplementary entrainer is supplied by the phase separator (3) join in. The temperature at the top of the tower is 38.7°C, the temperature at the bottom...

example 2

[0024] Example 2: if figure 1process shown. The next-wall azeotropic distillation column (1) adopts a tray column with a column diameter of 1200 mm and a column height of 18000 mm. The cross-sectional area ratio of the stripping section (II) and the side line rectification section (III) is 0.89:1, and the area (I) ~The plate number of (IV) is as example 1. The vapor phase at the bottom of the next wall (5) flows into the stripping section (II) and the side line rectifying section (III) respectively in a certain proportion, and the ratio of the mass flow rate of the vapor phase entering the stripping section (II) and the side line rectifying section (III) is 0.97:1. The compound solvent of toluene and tetrachlorethylene is used as entrainer, the mass ratio of toluene and tetrachlorethylene is 3:1, and the acrylic acid aqueous solution containing acetic acid impurities as the raw material enters the tower from the 14th plate at the bottom of the rectification section (I) to su...

example 3

[0027] Example 3: if figure 1 process shown. The next-wall azeotropic rectification column (1) adopts a packed tower with a tower diameter of 1400mm, a tower height of 14000mm, and the packing heights of areas (I) to (IV) are respectively 3200mm, 3500mm, 3200mm, and 1200mm, and the stripping section (II) and The cross-sectional area ratio of the side rectification section (III) is 2.45:1. The vapor phase at the bottom of the next wall (5) flows into the stripping section (II) and the side line rectifying section (III) respectively in a certain proportion, and the ratio of the mass flow rate of the vapor phase entering the stripping section (II) and the side line rectifying section (III) is 2.08:1. Using isopropyl ether as an entrainer, the acrylic acid aqueous solution containing acetic acid impurities as a raw material enters the tower from the bottom of the rectification section (I), and the supplementary entrainer is added through a phase separator (3). The temperature a...

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Abstract

The invention relates to a novel azeotropic distillation process method and a device thereof, in particular to a process method which use a septal azeotropic distillation column to produce acrylic acid, and a device thereof. The septal azeotropic distillation column is achieved by arranging a septal wall in the azeotropic distillation column in the vertical direction from the upper part to the bottom of the column, and the right side of the septal wall is sealed, and the azeotropic distillation column is divided into four areas. The acrylic acid solution containing the impurity of acetic acid enters into the column from the bottom of the rectification part (I); wherein, light components (water and acetic acid) and entrainer form azeotrope to be steamed out of the top of the column, and then the steam on the top of the column is condensed and treated by the phase separation; wherein, the organic phase (entrainer) reflows; the water phase (containing water and acetic acid) is exhaused out of the system; the material flow on the side rectification part (III) reflows to the feeding pipeline to be recycled; the acrylic acid product with the mass fraction of more than 99 percent can be obtained at the bottom of the public stripping part. With the invention, the dehydration of acrylic acid, the remove of acetic acid and the recycle of entrainer can be finished in the same column, thus the cost of the equipment and energy consumption are reduced.

Description

technical field [0001] The invention relates to an azeotropic rectification process and device, specifically a novel process and device for purifying acrylic acid by using a next-wall azeotropic rectification tower. to the same tower. Background technique [0002] Acrylic acid is mainly used in the production of butyl and ethyl acrylate comonomers for water-soluble coatings and adhesives and in the production of superabsorbent resins. Crude (unrefined) acrylic acid is almost all used in the production of acrylates (the most important are butyl, methyl, ethyl and 2-ethylhexyl esters) and other products used in coatings, papermaking, spinning, adhesives and ink industries. derivative. Glacial acrylic acid is mainly used in the production of superabsorbent polymers (superabsorbent resins, SPA) and detergent polymers, and a small amount is used in the production of polyacrylates as thickeners, dispersants and rheology control agents. [0003] The acrylic acid aqueous solution...

Claims

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Application Information

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IPC IPC(8): C07C57/07C07C51/44B01D3/36
Inventor 孙兰义李军昌兴武郭晓燕李青松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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