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Process and equipment for reducing content of sulfuric acid in sulfonated product heavy alkyl benzene sulfonic acid

A technology for heavy alkylbenzene sulfonic acid and products, which is applied in the field of technology and equipment for reducing the content of sulfuric acid in heavy alkyl benzene sulfonic acid, a sulfonated product, can solve the problems of long process and many waste acids, and achieve the reduction of sulfuric acid content, The effect of simple equipment and improved quality

Pending Publication Date: 2022-08-02
WEIXIAN NANJING SCI TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuming sulfuric acid is mixed with heavy alkylbenzene and then reacted under normal pressure. The sulfonated product is obtained through aging, sedimentation and acid separation. This method has a long process and produces more waste acid.

Method used

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  • Process and equipment for reducing content of sulfuric acid in sulfonated product heavy alkyl benzene sulfonic acid
  • Process and equipment for reducing content of sulfuric acid in sulfonated product heavy alkyl benzene sulfonic acid

Examples

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Effect test

Embodiment 1

[0034] The present embodiment provides a device for reducing the sulfuric acid content in the sulfonated product heavy alkylbenzenesulfonic acid, including:

[0035] Heavy acid storage tank 1, for storing the sulfonated product heavy alkylbenzenesulfonic acid obtained by sulfonation;

[0036] The stirring tank 2 is used for adsorbing the sulfuric acid component in the heavy alkyl benzene sulfonic acid;

[0037] Filter 3 is used to separate the product heavy alkyl benzene sulfonic acid and filter residue, and the filter residue is used to produce by-products;

[0038] The neutralization tank 4 is used to adjust the pH of the solution after the filter residue is dissolved in water and liquid caustic so as to facilitate the production of by-products;

[0039] The evaporative crystallization unit 5 is used to produce the by-product sodium sulfate.

[0040] like figure 2 As shown, the heavy acid storage tank 1, the stirring tank 2 and the filter 3 are all connected in sequence ...

Embodiment 2

[0047] The difference between this example and Example 1 is: in the process of reducing the sulfuric acid content in the sulfonated product heavy alkylbenzenesulfonic acid, the consumption of diatom powder is 30kg / t. The sulfuric acid content in the chemical product heavy alkyl benzene sulfonic acid is 0.38%, and the rest are the same as in Example 1.

Embodiment 3

[0049] The difference between this example and Example 1 is: in the equipment for reducing the sulfuric acid content in the sulfonated product heavy alkyl benzene sulfonic acid, the filter adopts an automatic slag discharge filter; In the process of sulfuric acid content, the consumption of diatom powder is 25kg / t. After testing, the sulfuric acid content in the sulfonated product heavy alkylbenzenesulfonic acid treated in this example is 0.37%, and the rest are the same as in Example 1.

[0050] The content of sulfuric acid in the heavy alkyl benzene sulfonic acid products on the market is all about 2%. Using the process method and equipment provided in Examples 1-3 of the present invention to treat the sulfonated product heavy alkyl benzene sulfonic acid can effectively reduce the heavy alkyl benzene sulfonic acid. The sulfuric acid content in the sulfonic acid is lower than 0.4%, which can obviously improve the product quality of the heavy alkylbenzenesulfonic acid. In addi...

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Abstract

The invention relates to the technical field of membrane type sulfonation production, in particular to a process and equipment for reducing the content of sulfuric acid in sulfonated product heavy alkyl benzene sulfonic acid, and the process comprises the following steps: S1, conveying the sulfonated product heavy alkyl benzene sulfonic acid from a heavy acid storage tank to a stirring tank, adding diatom powder according to a proportion, carrying out heat preservation stirring, and standing; s2, conveying the solution after standing to a filter by using a conveying pump, and collecting filtrate, namely the product heavy alkyl benzene sulfonic acid; s3, the filter residues obtained in the step S2 are separated into a neutralization tank, water and liquid caustic soda are added to adjust the pH value, stirring and filtering separation are conducted, the diatom powder is recycled after being aired and dried, a generated sulfate solution is crystallized through an evaporative crystallization unit, and a byproduct sodium sulfate salt crystal is obtained. By adopting the process method and equipment provided by the invention to treat the sulfonated product heavy alkyl benzene sulfonic acid, the content of sulfuric acid in the heavy alkyl benzene sulfonic acid can be effectively reduced to be lower than 0.4%, and the product quality of the heavy alkyl benzene sulfonic acid can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of membrane sulfonation production, in particular to a process and equipment for reducing the sulfuric acid content in the sulfonated product heavy alkylbenzenesulfonic acid. Background technique [0002] In the process of producing heavy alkylbenzene sulfonic acid by membrane sulfonation, the main preparation methods include fuming sulfuric acid sulfonation method, gas sulfur trioxide sulfonation method and sulfur trioxide sulfonation method in which the solvent is liquid sulfur dioxide. [0003] The gas sulfur trioxide sulfonation method is to oxidize the molten refined sulfur with air to obtain sulfur dioxide and sulfur trioxide. After the sulfur trioxide is mixed with dry air, it is sulfonated with heavy alkyl benzene in a membrane reactor. The process of this method is It is lengthy, the investment is large, and the exhaust gas is generated. [0004] The liquid sulfur dioxide solvent method is to mix l...

Claims

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Application Information

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IPC IPC(8): C07C303/44C07C309/30C01D5/16
CPCC07C303/44C01D5/16C07C309/30
Inventor 牛云兴
Owner WEIXIAN NANJING SCI TECH CORP LTD
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