Method for preparing industrial grade and food grade phosphoric acid by wet method phosphoric acid

A wet-process phosphoric acid, industrial-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of excessive sodium ions in the purification acid, serious organic phase entrainment in the acid phase, increased process and purification costs, etc. Achieve complete removal, reduce energy consumption, reduce density and viscosity
CN1204044CInactive Publication Date: 2005-06-01SICHUAN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2005-06-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for preparing industrial-grade phosphoric acid with wet-process phosphoric acid. The process steps include pretreatment, desulfurization, filtration and separation, extraction, deep desulfurization, washing, back-extraction and concentration; Fluorine agent and decolorizing agent, desulfurization, defluorination and decolorization are carried out in one process, the reaction temperature is 60-80°C, and the reaction time is 2-4 hours. The method of preparing food-grade phosphoric acid with wet-process phosphoric acid is to add a deep defluorination process on the basis of the above-mentioned process steps for preparing industrial-grade phosphoric acid, and the deep defluorination process is placed after the stripping process. This method simplifies the process, reduces energy consumption and saves costs.
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Description

1. Technical field

[0001] The invention belongs to the preparation method of industrial-grade phosphoric acid and food-grade phosphoric acid, and particularly relates to a process for purifying wet-process phosphoric acid into industrial-grade phosphoric acid or food-grade phosphoric acid by using a solvent extraction method using wet-process phosphoric acid as a raw material. 2. Background technology

[0002] The preparation of industrial-grade phosphoric acid and food-grade phosphoric acid can be either hot-process phosphoric acid or wet-process phosphoric acid. Due to the high energy consumption of thermal phosphoric acid production, people are more willing to use wet-process phosphoric acid due to the increasing energy shortage. However, wet-process phosphoric acid contains high impurities and must be purified to meet the requirements of industrial-grade phosphoric acid and food-grade phosphoric acid. Regarding the purification of wet-process phosphoric acid, there are m...

Claims

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