A method for preparing magnesium-aluminum hydrotalcite for PVC based on TBT by-product magnesium chloride

By using deep purification and hydrothermal synthesis with a composite alkali system, the problems of high energy consumption and resource waste of magnesium chloride, a byproduct of tetrabutyltin, were solved. High-purity magnesium aluminum hydrotalcite was prepared for use in PVC processing, which improved the thermal stability and compatibility of the product and realized the high-value utilization of industrial byproducts.

CN122403479APending Publication Date: 2026-07-17ANHUI HENGGUANG POLYURETHANE MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI HENGGUANG POLYURETHANE MATERIAL CO LTD
Filing Date
2026-04-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The existing technology for processing magnesium chloride, a byproduct of tetrabutyltin, suffers from problems such as high energy consumption, significant resource loss, difficulty in removing organotin residues, low product added value, and poor compatibility with PVC. Furthermore, traditional synthesis methods result in uneven grain size distribution and large batch-to-batch quality fluctuations.

Method used

A deep purification system combining hydrogen peroxide oxidation, modified activated carbon adsorption, and complexation with a composite complexing agent was adopted. Magnesium aluminum hydrotalcite was prepared by centrifugal spray drying, combined with magnesium hydroxide seed induction and hydrothermal synthesis of a composite alkali system. In-situ surface modification was then carried out to improve compatibility.

Benefits of technology

The preparation of high-purity, high-crystallinity magnesium aluminum hydrotalcite has been achieved, which has excellent thermal stability and good PVC compatibility, reducing production costs and environmental disposal pressure, and realizing the closed-loop high-value utilization of industrial by-products.

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Abstract

The application relates to the technical field of comprehensive utilization of chemical resources, and particularly discloses a method for preparing magnesium-aluminum hydrotalcite for PVC based on by-product magnesium chloride in TBT production. The method takes by-product magnesium chloride hexahydrate in tetrabutyl tin production as raw material, first converts organic tin into inorganic tin ions through pre-oxidation, then removes impurities through the cooperation of modified activated carbon and composite complexing agent, then induces the refined magnesium chloride solution through magnesium hydroxide seeds, hydrothermally synthesizes the refined magnesium chloride solution through a composite alkali system, performs in-situ surface modification, and performs centrifugal spray drying, and finally obtains magnesium-aluminum hydrotalcite. The whole process is chemically logical and rigorous, and has strong industrialization adaptability. The method solves the industry pain points of difficult removal of organic tin residues in by-product magnesium chloride in tetrabutyl tin production, great loss of magnesium resources, and insufficient product purity, the obtained product has a regular layered structure, excellent thermal stability and good PVC compatibility, realizes closed-loop high-value utilization of industrial by-products, and has outstanding environmental and economic benefits.
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