Acrylic acid purification tower

A light-removing tower, acrylic acid technology, applied in distillation separation, organic chemistry, chemical instruments and methods, etc., can solve the problems of affecting efficiency, affecting the production cycle of the tower, and the separation effect is not optimal.

Inactive Publication Date: 2005-10-19
SHANGHAI HUAYI NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the polymerization of acrylic acid mostly occurs at the bottom of the tower and the stripping section of the tower, it is appropriate to use a large-pore sieve plate that is easy to clean when designing this part, but a large-pore sieve plate is also used in the rectification section where polymerization is not easy to occur. The design of the whole tower will inevitably affect the efficiency of the whole tower, thereby reducing the processing capacity of the light removal tower
Because the efficiency of the whole tower is not high, the separation effect is not optimal. In the actual operation process, in order to meet the requirements of the composition of the bottom of the tower for the content of acetic acid, the method of increasing the temperature of the bottom of the tower can only be adopted.
However, when the rectification tower operates in a higher temperature range, the possibility of polymerization reaction increases, which can easily cause unnecessary polymerization reaction and affect the production cycle of the tower.
On the other hand, too high operating temperature also causes the acrylic acid lost at the top of the tower to exceed the standard, which not only increases the unit consumption of acrylic acid production, but also adversely affects subsequent production and wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The total number of trays in the acrylic acid purification and light removal tower is 21 trays, and the feed port is between 11 and 12 trays. The stripping section of the tower adopts 11 large-hole through-flow type with an opening ratio of 10-20%. Sieve tray, 10 co-current jet trays are used in the rectification section (such as image 3 Shown), the inner diameter of the tower is 1400mm. The mass transfer unit of the tray adopts a packing-free structure, the purpose is to prevent a small amount of polymer that may be generated in the rectification section from clogging the tray, and if a small amount of polymer is generated, it is easy to remove. The height of the overflow weir is 10mm. During implementation, the content of acetic acid at the bottom of the tower is less than 2%, the loss of acrylic acid at the top of the tower is less than 2%, the pressure drop of the whole tower is about 6kpa, and the operating temperature at the bottom of the tower is about 85°C. Th...

Embodiment 2

[0029] On the basis of embodiment 1, the 5 unpacked co-current jet trays in the upper part of the rectification section are replaced with packed co-current jet trays (such as Figure 4shown), the remaining 5 blocks remain unchanged, and holes are opened on the upper part of the mass transfer unit to further reduce the pressure drop of the device. At the same time, in order to enhance the gas-liquid mass transfer effect, the height of the overflow weir is increased to 20mm. During implementation, the content of acetic acid at the bottom of the tower is controlled below 2.%, the loss of acrylic acid at the top of the tower is below 1.5%, the pressure drop of the whole tower remains about 6kpa, and the temperature at the bottom of the tower has been controlled below 82°C. The number of theoretical plates in the stripping section has not changed, but the number of theoretical plates in the rectifying section has increased to 4, and the number of theoretical plates in the whole col...

Embodiment 3

[0031] On the basis of Example 1, the 3 large-pore sieve trays near the rectification section in the upper part of the stripping section were replaced with filler-free co-flow jet trays, and 10 co-flow jet trays were still used in the rectification section. During the implementation process , the content of acetic acid at the bottom of the tower is controlled below 1.5%, the loss of acrylic acid at the top of the tower is below 1.0%, the pressure drop of the whole tower remains about 6.5kpa, and the temperature at the bottom of the tower is controlled at 83°C. The theoretical tray number of the whole tower is 7 trays. Under this operating condition, the processing capacity of the device exceeds 3500kg / h, and the production cycle reaches more than 120 days.

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Abstract

The present invention provides an acrylic acid purification light-removing tower whose lower stage adopts macroporous sieve-plate and upper stage adopts parallel flow jet tray. Said tower can effectively raise separation power and reduce temp. of tower bottom, reduce energy consumption and reduce the polymerization tendency of acrylic acid of tower bottom.

Description

field of invention [0001] The invention relates to a novel acrylic acid purification and light removal tower. Specifically, the present invention relates to the use of large-pore sieve trays in the stripping section of the tower, and the use of co-current jet trays in the rectification section, and the number of co-current jet trays accounts for 20-80% of the total number of trays. Background of the invention [0002] Acrylic acid and its esters are unsaturated compounds with double bonds, and their chemical properties are very active. The vinyl group they have is very easy to self-polymerize or copolymerize with other monomers. The polymerization speed of acrylic acid is much faster than that of acrylates. The polymerization reaction is very fast and releases a large amount of heat. Once it occurs, it is difficult to control. Therefore, preventing the self-polymerization of acrylic acid is the first consideration in the design of each device of the acrylic acid purification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/00C07C57/04C07C57/07
Inventor 唐勇郑相潮蓝仁水印俊
Owner SHANGHAI HUAYI NEW MATERIAL
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