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Comprehensive utilization method of sulphonation waste acid from sulphonation contraposition ester production process

A technology for the production process of sulfonated para-ester, applied in the direction of sulfonic acid preparation, sulfur trioxide/sulfuric acid, etc., can solve the problems of large waste of human resources, unacceptable environment, high incineration cost, etc.

Inactive Publication Date: 2009-07-15
TIANJIN DEK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Like evaporation, incineration is costly and causes acid rain, making it environmentally unacceptable
[0006] Using other methods: such as ozone method, electrolysis method and strong oxidant method, there are also problems such as large energy consumption, high cost, and large waste of human resources.

Method used

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  • Comprehensive utilization method of sulphonation waste acid from sulphonation contraposition ester production process

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Embodiment 1

[0020] 20m of sulfonated waste acid produced in the sulfonation process in the production of PS (sulfonated para-ester) 3 Collect it into the recovery tank at 50°C through an acid-resistant pump, add 60kg of granular activated carbon to it, stir slowly and absorb for 3 hours, then pump it to the filter press for pressure filtration by the acid-resistant pump, and filter out the colorless dilute sulfuric acid clear liquid. The concentration is about 40%. This dilute sulfuric acid is used to adjust the pH value of the diazotization reaction in the production process of reactive dyes.

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Abstract

The invention provides a method for treating and utilizing sulfonation waste acid, which comprises the following steps: firstly, collecting the waste acid generated by sulfonation in the sulfonated para-ester manufacture to a recycling pot; secondly, adding granular activated carbon inside the recycling pot to perform stirring adsorption or fixed bed adsorption; separating the waste acid solution from adsorbing agent after the adsorption, obtaining a waste acid clear solution by using a filter press to filter the waste acid, and using the waste acid clear solution for adjusting the pH value of the diazotization reaction.

Description

technical field [0001] The invention relates to a treatment and utilization method of waste acid produced by sulfonation reaction in the production process of sulfonated para-ester (PS). Background technique [0002] Sulfonation is an important reaction in the synthesis of fine chemicals. In the synthesis of sulfonated para-esters, fuming sulfuric acid with strong sulfonating ability is generally used as the sulfonating agent for sulfonation. After the sulfonation is completed, dilute and filter with suction, and the filtrate is the sulfonated waste acid, which has a large amount of acid solution, is dark brown, has complex chemical components, and high acidity (30% to 40%). If it is discharged without treatment, it will not only cause serious pollution to the environment, but also cause waste of acid resources. [0003] Neutralization is the most common method of waste acid treatment. After the waste sulfuric acid is neutralized, it will be landfilled in the form of gypsu...

Claims

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Application Information

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IPC IPC(8): C01B17/90C07C303/06
Inventor 张兴华邢广文
Owner TIANJIN DEK CHEM
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