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.

Active Publication Date: 2021-11-19
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although chlorine gas has application value in the fields of disinfection and tap water treatment, the industrial demand for chlorine gas is far less than the demand for sodium hydroxide. At the same time, alkali production often requires harmless treatment of chlorine gas to reduce environmental hazards, thus causing a large amount of Production capacity is wasted, so regulating the production capacity of sodium hydroxide and chlorine gas has become an important issue for upgrading the industrial structure

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  • A kind of coproduction method of caustic soda and ferric orthophosphate

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Experimental program
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Effect test

Embodiment 1

[0025] The glycine was dissolved in an aqueous solution of 20 ml of 1 mol / L of the sodium sulfate solution at a concentration of 1 mol / L, and then the iron sulfate was dissolved according to the concentration of 0.5 mol / L under stirring. Anode electrolyte. The aqueous sodium sulfate solution of 20 ml of 1 mol / L was used as the cathode electrolyte. The electrolyte is stored in two storage tanks, respectively. The preparation of the anode concentration fluid is as follows: 5 mm thick carbon felt baked for 24 hours in air at 400 ° C, and the graphite sheet is combined as an anodic concentration fluid. The prepared by the cathode concentration fluid is followed: 5 mm thick carbon felt baked for 24 hours in 400 ° C air, inserted the mitolating titanium-plated titanium web of the same area, and the entire graphite plate is engaged as a cathode current collector. In this embodiment, the collector area is 10 cm. 2 . Then, 10 cm will be 2 The Nafion117 film was treated at 80 ° C in...

Embodiment 2

[0027] The glycine was dissolved in an aqueous solution of 20 ml of 1 mol / L of the sodium sulfate solution at a concentration of 1 mol / L, and then the iron sulfate was dissolved according to the concentration of 0.5 mol / L under stirring. Anode electrolyte. The aqueous sodium sulfate solution of 20 ml of 1 mol / L was used as the cathode electrolyte. The electrolyte is stored in two storage tanks, respectively. The preparation of the anode concentration fluid is as follows: 5 mm thick carbon felt baked for 24 hours in air at 400 ° C, and the graphite sheet is combined as an anodic concentration fluid. The prepared by the cathode concentration fluid is followed: 5 mm thick carbon felt baked for 24 hours in 400 ° C air, inserted the mitolating titanium-plated titanium web of the same area, and the entire graphite plate is engaged as a cathode current collector. In this embodiment, the collector area is 10 cm. 2 . Then, 10 cm will be 2 The Nafion117 film was treated at 80 ° C in...

Embodiment 3

[0029] Glycine accordance with 1mol / L was dissolved in a concentration of 20mL2mol / L aqueous solution of sodium chloride, ferrous chloride under stirring in accordance with a concentration of 0.5 mol / L was dissolved anolyte obtained. In 20mL1mol / L aqueous sodium sulfate solution as the catholyte. Electrolyte are stored in two tanks. Anode current collector prepared as follows: A 5 mm thick carbon felt burned for 24 hours at 400 deg.] C in air, in cooperation with the graphite plate is attached to the anode current collector. Cathode current collector was prepared as follows: A 5mm thick carbon felt burning 24 hours in air at 400 deg.] C, the same area platinized titanium mesh inserted in the middle, in cooperation with the graphite plate integrally attached to the cathode current collector. In this embodiment, the current collector is 10 cm on the area 2 . Then, 10 cm 2 Nafion117 film for 6 hours in 1 mol / L NaOH in 80 ℃, as a battery separator, assembled into a flow batt...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/16C01B25/37C25B1/00
CPCC01B25/375C25B1/00C25B1/16
Inventor 王永刚孔涛逸
Owner FUDAN UNIV
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