A method for recovering tribromophenol, tetrabromobisphenol a, and dibromophenol from a bromine-containing solid waste by melt crystallization

By using the melt crystallization method to treat bromine-containing solid waste, the problems of high treatment difficulty and high cost in existing technologies have been solved. This method enables the efficient and low-energy recovery of tribromophenol, tetrabromobisphenol A, and dibromophenol, improving product purity and recovery rate.

CN120518445BActive Publication Date: 2025-10-17天津绿缘环保工程股份有限公司 +1
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Patent Information

Application Number
CN202511003259.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-21
Publication Date
2025-10-17
Estimated Expiration
2045-07-21

AI Technical Summary

Technical Problem

In existing technologies, the treatment methods for bromine-containing solid waste have problems such as difficulty in treating incineration exhaust gas, easy generation of secondary pollution, high cost, and difficulty in recovering tetrabromobisphenol A due to the decomposition of tribromophenol.

Method used

The melt crystallization method involves reacting bromine-containing solid waste, solvent, and catalyst, followed by liquid-liquid separation. Solvents are recovered by utilizing the difference in their boiling points. The mixture is then subjected to melting, cooling, sweating, and melting treatments, combined with recrystallization and drying steps, to separate tribromophenol, tetrabromobisphenol A, and dibromophenol products.

Benefits of technology

The system achieved the recovery of tribromophenol, tetrabromobisphenol A, and dibromophenol with high purity (all greater than 99 wt%) and high recovery rate, reducing energy consumption, improving product quality, simplifying the process, and achieving ecological and economic benefits.

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Abstract

The application provides a method for recovering tribromophenol, tetrabromobisphenol A and dibromophenol from bromine-containing solid waste by melting crystallization, and relates to the field of solid waste recovery. The method comprises the following steps: mixing bromine-containing solid waste, a solvent and a catalyst to perform a reaction, then performing liquid-liquid separation to obtain a bromine-containing organic phase and salt-containing wastewater; recovering the solvent in the bromine-containing organic phase to obtain a bromine-containing organic mixture; preheating the bromine-containing organic mixture, then performing melting, cooling, sweating and melting treatment to obtain crude tribromophenol and crude tetrabromobisphenol A; performing vacuum rectification on the crude tribromophenol to obtain dibromophenol and a column still product; performing recrystallization, solid-liquid separation, water washing and drying on the column still product to obtain tribromophenol; and performing recrystallization, solid-liquid separation, alkali washing and drying on the crude tetrabromobisphenol A to obtain tetrabromobisphenol A. The method provided in the application adopts reaction impurity removal and melting crystallization and is coupled with a recrystallization process, so that tribromophenol, tetrabromobisphenol A and dibromophenol products can be obtained at the same time, the process is simple, and the energy consumption is significantly reduced compared with the traditional method.
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