Method for preparing high-purity crystalline aluminum chloride from 1, 4-bis (4-fluorobenzoyl) benzene production wastewater

Through the series treatment of three-effect evaporator, static mixer and crystallizer, the problems of environmental protection and resource waste in the wastewater treatment of 1,4-bis(4-fluorobenzoyl)benzene production are solved, and the preparation of high-purity crystalline aluminum chloride and efficient recycling of wastewater are achieved, thereby reducing energy consumption and equipment costs.

CN120483216APending Publication Date: 2025-08-15ORION NEW MATERIALS (SHANDONG) CO LTD
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Patent Information

Application Number
CN202510625720.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-15
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

In the prior art, the 1,4-bis(4-fluorobenzoyl)benzene production wastewater treatment method has environmental problems, waste of aluminum resources and high energy consumption, and the treatment process is complex and costly, making it difficult to achieve high value-added utilization.

Method used

The crystalline aluminum chloride wastewater is treated in series by using a three-effect evaporator, static mixer and crystallizer. High-purity crystalline aluminum chloride is prepared by circulating concentration, acidification and filtration, and the pH value is adjusted using hydrochloric acid and reduced insoluble matter, reducing equipment investment and energy consumption.

Benefits of technology

The preparation of high-purity (≥98%) crystalline aluminum chloride is achieved, which reduces energy consumption and equipment costs, and efficient recycling of wastewater, avoids environmental protection problems and waste of aluminum resources.

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Abstract

The invention discloses a method for preparing high-purity crystalline aluminum chloride from 1, 4-bis (4-fluorobenzoyl) benzene production wastewater, which belongs to the technical field of 1, 4-bis (4-fluorobenzoyl) benzene production, and comprises the following steps: (1) introducing aluminum chloride wastewater generated in 1, 4-bis (4-fluorobenzoyl) benzene production into a triple-effect evaporator for cyclic concentration and evaporation; (2) filtering the crystallized aluminum chloride solution concentrated in the step (1), and mixing with hydrochloric acid, so that the pH value of the crystallized aluminum chloride solution is less than 2; (3) feeding the acidified crystalline aluminum chloride solution in the step (2) into a crystallizer for crystallization; and (4) feeding the material in the crystallizer in the step (3) to a centrifugal filter for filtering to obtain crystalline aluminum chloride with the purity of more than 98%, and returning the mother liquor to the crystallizer. According to the method, the aluminum chloride wastewater is treated by using the triple-effect evaporator, aluminum-containing insoluble substances generated by thermal decomposition and hydrolysis after evaporation are treated by adding hydrochloric acid, the purity of crystallized aluminum chloride is high and can be stabilized at 98% or above, and the standard of a premium grade product is met.
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