Method for preparing acid and alkali through sodium sulfate bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and sodium sulfate, applied in the direction of separation methods, chemical instruments and methods, sulfur trioxide/sulfuric acid, etc., can solve the problems of complex soda production process and high production cost, and achieve the solution of complex process and production cost Low, high conversion utilization

Inactive Publication Date: 2021-06-11
四川恩特普环保科技有限公司
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Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing acid-base by sodium sulfate bipolar membrane electrodialysis, which solves the problems of complicated and high production cost in the existing acid-base production process

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  • Method for preparing acid and alkali through sodium sulfate bipolar membrane electrodialysis
  • Method for preparing acid and alkali through sodium sulfate bipolar membrane electrodialysis

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[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0019] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention discloses a method for preparing acid and alkali through sodium sulfate bipolar membrane electrodialysis, belongs to the technical field of acid and alkali making, and aims to solve the problems that the existing acid and alkali making process is complex and high in production cost. The method comprises the following steps: (1) dissolving a sodium sulfate decahydrate solid to form a sodium sulfate solution; (2) adding sodium carbonate and sodium hydroxide into the sodium sulfate solution, reacting to form a solid precipitate, and adjusting the pH value of the solution to 8-10; (3) carrying out filtering and advanced oxidation processes on the solution to remove solid impurities and organic matter impurities; (4) performing secondary filtration on the solution, adsorbing impurities through activated carbon, and adsorbing calcium and magnesium ions through resin; (5) filtering the solution through a precision filter, so that the contents of various ions and impurities in the filtrate meet the design requirements of bipolar membrane electrodialysis; and (6) treating the filtrate through a bipolar membrane electrodialysis process to obtain sodium hydroxide and a sulfuric acid solution, and recycling the low-concentration sodium sulfate solution. The method is suitable for sodium sulfate bipolar membrane electrodialysis acid-base preparation.

Description

technical field [0001] The invention belongs to the technical field of acid and alkali production, and in particular relates to a method for preparing acid and alkali by sodium sulfate bipolar membrane electrodialysis. Background technique [0002] my country is a large agricultural country. The huge demand for fertilizers in agricultural production has directly led to the vigorous development of my country's sulfuric acid industry. At the same time, sulfuric acid is also widely used in the chemical industry. In the past ten years, the output of sulfuric acid in my country has increased year by year, providing an important raw material guarantee for the development of the national economy. However, behind the rapid development, there are many problems. For many years, the discharge of acidic wastewater and harmful waste residues has also caused serious environmental problems that need to be solved urgently. The production of sulfuric acid has gradually shifted to the directi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01B17/74C01B17/90C01D1/38C02F1/28C02F1/469C02F1/72
CPCC02F9/00C01D1/38C01B17/745C01B17/90C02F1/72C02F1/283C02F1/4693
Inventor 郭定江蔡松林郭乾勇唐旭东梁志饶赵宏凌
Owner 四川恩特普环保科技有限公司
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