Phosphoric acid desulfurization method

Through the combination of multi-stage extraction and refined desulfurization system, the problem that the sulfate content in wet phosphoric acid cannot meet industrial-grade standards is solved, efficient sulfate removal and product quality improvement are achieved, and resource recycling and cost reduction are promoted.

CN119683584APending Publication Date: 2025-03-25WENGFU (GRP) CO LTD
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Patent Information

Application Number
CN202411926493.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The prior art has poor effect in the wet phosphoric acid desulfurization process, resulting in the sulfate content in the phosphoric acid that cannot meet industrial-grade standards, affecting the quality of downstream products.

Method used

The combination of multi-stage extraction and refined desulfurization system is adopted to gradually reduce the sulfate content in the phosphoric acid by pretreating and precise adjustment of no-load solvents, low-thiophosphoric acid and desulfurization agents, and further optimize the desulfurization effect by controlling the packaging of the desulfurizer and barium sulfate.

Benefits of technology

It effectively reduces the sulfate content in phosphoric acid, makes it meet industrial-grade standards, improves product quality, and achieves the goal of sustainable development through the recycling of resources and the reduction of costs.

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Abstract

The invention relates to a phosphoric acid desulfurization method. Raw material phosphoric acid passes through a first desulfurization reaction tank and a first-stage phase splitter to obtain a first load solvent and first raffinate acid; the first load solvent and low-sulfur phosphoric acid 1 are extracted in a second desulfurization reaction tank and separated by a second-stage phase splitter to obtain a second load solvent and second raffinate acid, and the second load solvent and low-sulfur phosphoric acid 2 are extracted in a third desulfurization reaction tank and separated by a third-stage phase splitter to obtain a third load solvent and third raffinate acid; the third load solvent enters a fine desulfurization system for a desulfurization reaction, a fourth load solvent and fourth raffinate acid are obtained, the fourth load solvent enters a washing tower for washing, the washed fourth load solvent enters a back extractor for back extraction, and a no-load solvent and back extraction acid are obtained; the sulfur content in the reverse extraction acid reaches the standard of industrial grade purified phosphoric acid.
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