A kind of coproduction method of caustic soda and ferric orthophosphate

A technology of ferric orthophosphate and caustic soda, which is applied in the field of electrolysis, can solve problems such as waste of production capacity, and achieve the effect of reducing energy consumption and overcoming excess production capacity of chlorine gas.
CN112853375BActive Publication Date: 2021-11-19FUDAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FUDAN UNIV
Publication Date
2021-11-19

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Abstract

The invention belongs to the technical field of electrolysis, and in particular relates to a co-production method of caustic soda and ferric orthophosphate. The co-production method of the present invention comprises: preparing NaOH and ferric ions by electrolytic method, using cation exchange membrane and / or microporous membrane as the separation membrane of cathode and anode, the aqueous solution containing sodium ion as catholyte, containing ferrous ion and An aqueous solution of sodium ions is used as an anolyte; ferric orthophosphate is prepared by a chemical precipitation method; a solution of ferric iron ions is used as a raw material, and an aqueous solution containing phosphate ions is added as a precipitating agent to generate ferric orthophosphate. Compared with the traditional chlor-alkali process, the present invention has the following advantages: 1. The caustic soda process can avoid the generation of chlorine gas and overcome the overcapacity of chlorine gas caused by caustic soda production; 2+ The oxidation potential (0.771V vs SHE) is much lower than that of chloride ion (1.36V vs SHE), so energy consumption can be reduced; the produced FePO 4 It can be used to prepare lithium-ion or sodium-ion battery electrode materials.
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Description

Technical field

[0001] The present invention belongs to the field of electrolysis technology, and is specifically involved in a bicyculin and iron of iron-free iron. Background technique

[0002] Due to the low energy consumption, high product quality, less pollution, electrolytic brine as a main method for obtaining sodium hydroxide has been widely used in industrial production. However, 1 mol of sodium hydroxide was obtained from the electrolysis process, 0.5 mol of chlorine gas was obtained. Although chlorine gas has the application value in the field of disinfection and tap water treatment, the demand for chlorine gas is far less than the demand for sodium hydroxide, and the alkali often needs to harmily harmlessly treated chlorine gas to reduce environmental hazards, thus causing a lot Waste production capacity, so capacity to regulate sodium hydroxide and chlorine is an important topic of industrial structure upgrade.

[0003] As an efficient electrochemical energy conversi...

Claims

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