Improved T acid wastewater extraction process and preparation method of modified naphthalene dispersant or naphthalene water reducer

Abstract

The invention discloses an improved T acid wastewater extraction process and a preparation method of a modified naphthalene dispersant or naphthalene water reducer. Specifically, the T acid wastewaterextraction process uses concentrated sulfuric acid to adjust the pH value of T acid wastewater, also utilizes an extractant to extract a waste T acid complex, and then performs back extraction through a back-extractant, thus obtaining waste T acid alkaline liquid with a sodium sulfate content of less than 10% and a recovered extractant. The recovered extractant can be repeatedly used for T acid wastewater extraction process, and the waste T acid alkaline liquid can be used for preparation of the undermentioned modified naphthalene dispersant or naphthalene water reducer. The preparation method of the modified naphthalene dispersant or naphthalene water reducer includes: subjecting naphthalene or methylnaphthalene to sulfonation reaction, adding the waste T acid alkaline liquid for hydrolysis reaction, and adding formaldehyde dropwise for condensation reaction, thus finally obtaining a modified naphthalene dispersant or naphthalene water reducer liquid product with a solid content of 30-50%.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an improved T-acid wastewater extraction process and a preparation method for a modified naphthalene-based dispersant or a naphthalene-based water reducer. Background technique [0002] H-acid intermediates are extremely important raw materials in the synthesis of reactive dyes, acid dyes and other dyes. However, in the production process, T-acid wastewater and H-acid wastewater will be generated. The current treatment method is through traditional extraction methods. The organic matter is highly concentrated together, but because in the process of extraction and stripping, new sodium sulfate will still be entrained, and the content is relatively high, generally exceeding 15%. The use of naphthalene-based sulfonated compounds has brought great difficulties. Some people have tried to add them in the condensation reaction stage of naphthalene-based sulfonated compounds...

AI Technical Summary

Problems solved by technology

[0002] H-acid intermediates are extremely important raw materials in the synthesis of reactive dyes, acid dyes and other dyes. However, in the production process, T-acid wastewater and H-acid wastewater will be generated. The current treatment method is through traditional extraction methods. The organic matter is highly concentrated together, but because in the process of extraction and stripping, new sodium sulfate will still be entrained, and the content is relatively high, generally exceeding 15%. The use of naphthalene-based sulfonated compounds has brought great difficulties. Some people have tried to add them in the condensation reaction stage of naphthalene-based sulfonated compounds during the preparation of naphthalene-based dispersants or naphthalene-based water reducers, trying to make these organic compounds access to naphthalene-based dispersants. Naphthalene-based water reducer or naphthalene-based water reducer molecular structure, but without success, it affects the dispersion performance of naphthalene-based dispersant or naphthalene-based water-reducer. The fundamental reason is that during the condensation reaction, methylene can only condense in these On the amino group of the organic matter, this is equivalent to terminating the further condensation of the molecular chain of the naphthalene-based sulfonate, which will affect the normal condensation reaction of the naphthalene-based sulfonate, greatly reducing the molecular weight of the product, thereby seriously affecting the dispersion performance of the product

This has led to many manufacturers of naphthalene-based dispersants or naphthalene-based water reducers unwilling to use highly concentrated organic matter in wastewater provided by H-acid manufacturers.