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Co-production method of caustic soda and ferric orthophosphate

A technology of ferric orthophosphate and caustic soda, applied in the field of electrolysis, can solve problems such as waste of production capacity, achieve the effect of reducing energy consumption and overcoming excess production capacity of chlorine gas

Active Publication Date: 2021-05-28
FUDAN UNIV
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  • Summary
  • 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

Method used

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  • Co-production method of caustic soda and ferric orthophosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Dissolve glycine at a concentration of 1 mol / L in 20 mL of 1 mol / L sodium sulfate aqueous solution, and then dissolve ferrous sulfate at a concentration of 0.5 mol / L under stirring to obtain an anolyte. Use 20mL of 1mol / L sodium sulfate aqueous solution as the catholyte. Electrolyte is stored separately in two storage tanks. The preparation of the anode current collector is as follows: a carbon felt with a thickness of 5 mm was fired in air at 400 °C for 24 hours, and then bonded with a graphite plate as the anode current collector. The preparation of the cathode current collector is as follows: a 5 mm thick carbon felt was burned in air at 400 °C for 24 hours, a platinum-coated titanium mesh of the same area was inserted in the middle, and the whole was bonded with a graphite plate as the cathode current collector. In this example, the current collector area is 10 cm 2 . Then, place the 10 cm 2 The Nafion117 membrane was treated in 1 mol / L NaOH at 80 °C for 6 hour...

Embodiment 2

[0027] Dissolve glycine at a concentration of 1 mol / L in 20 mL of 1 mol / L sodium sulfate aqueous solution, and then dissolve ferrous sulfate at a concentration of 0.5 mol / L under stirring to obtain an anolyte. Use 20mL of 1mol / L sodium sulfate aqueous solution as the catholyte. Electrolyte is stored separately in two storage tanks. The preparation of the anode current collector is as follows: a carbon felt with a thickness of 5 mm was fired in air at 400 °C for 24 hours, and then bonded with a graphite plate as the anode current collector. The preparation of the cathode current collector is as follows: burn a 5mm thick carbon felt in air at 400°C for 24 hours, insert a platinum-coated titanium mesh with the same area in the middle, and bond the whole with a graphite plate as the cathode current collector. In this example, the current collector area is 10 cm 2 . Then, place the 10 cm 2 The Nafion117 membrane was treated in 1 mol / L NaOH at 80 °C for 6 hours, used as a batte...

Embodiment 3

[0029] Dissolve glycine at a concentration of 1 mol / L in 20 mL of 2 mol / L sodium chloride aqueous solution, and then dissolve ferrous chloride at a concentration of 0.5 mol / L under stirring to obtain an anolyte. Use 20mL of 1mol / L sodium sulfate aqueous solution as the catholyte. Electrolyte is stored separately in two storage tanks. The preparation of the anode current collector is as follows: a carbon felt with a thickness of 5 mm was fired in air at 400 °C for 24 hours, and then bonded with a graphite plate as the anode current collector. The preparation of the cathode current collector is as follows: a 5 mm thick carbon felt was burned in air at 400 °C for 24 hours, a platinum-coated titanium mesh of the same area was inserted in the middle, and the whole was bonded with a graphite plate as the cathode current collector. In this example, the current collector area is 10 cm 2 . Then, place the 10 cm 2 The Nafion117 membrane was treated in 1 mol / L NaOH at 80 °C for 6 ho...

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Abstract

The invention belongs to the technical field of electrolysis, and particularly relates to a co-production method of caustic soda and ferric orthophosphate. The co-production method comprises the following steps: preparing NaOH and ferric ions by an electrolytic method, taking a cation exchange membrane and / or a microporous membrane as a separation membrane of a cathode and an anode, taking an aqueous solution containing sodium ions as a cathode electrolyte, and taking an aqueous solution containing ferrous ions and sodium ions as an anode electrolyte; preparing ferric orthophosphate by a chemical precipitation method; by using a ferric ion solution as a raw material, adding an aqueous solution containing phosphate ions as a precipitator to generate ferric orthophosphate. Compared with the traditional chlor-alkali process, the invention has the following advantages: the caustic soda process can avoid the generation of chlorine and overcome the excessive chlorine production capacity caused by caustic soda production; the oxidation potential (0.771 V vs SHE) of Fe < 2 + > is far lower than that (1.36 V vs SHE) of chloride ions, so that the energy consumption can be reduced; so that the produced FePO4 can be used for preparing a lithium ion or sodium ion battery electrode material.

Description

technical field [0001] The invention belongs to the technical field of electrolysis, and in particular relates to a co-production method of caustic soda and ferric orthophosphate. Background technique [0002] Due to low energy consumption, high product quality and less pollution, electrolysis of salt water has been widely used in industrial production as the main method to obtain sodium hydroxide. However, for every 1 mol of sodium hydroxide obtained during electrolysis, 0.5 mol of chlorine gas will be obtained. Although chlorine gas has application value in the fields of disinfection and tap water treatment, the demand for chlorine gas in industry is far less than that for sodium hydroxide. At the same time, chlorine gas is often required to be harmlessly treated 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 in upgrading...

Claims

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Application Information

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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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