Continuous chlorine-alkali industry electrolytic alkali production device and method

Abstract

The invention discloses a continuous chlorine-alkali industry electrolytic alkali production device and method. A cation exchange membrane is arranged in an electrode tank to divide the electrode tank into an anode chamber and a cathode chamber, the anode chamber is provided with an anode, and the cathode chamber is provided with a cathode. A concentrated sodium chloride aqueous solution flows into the anode chamber, water flows into the cathode chamber, the sodium chloride aqueous solution and the water reversely flow in the anode chamber and the cathode chamber, meanwhile, direct current is introduced into the anode and the cathode for electrolysis, a dilute sodium chloride aqueous solution flows out of the anode chamber, and alkali liquor containing sodium hydroxide flows out of the cathode chamber. According to the invention, sodium ions are always migrated along the concentration gradient while the electrolytic reaction is continuously carried out, and a relatively stable concentration difference is kept, so that the phenomena of electrolytic reaction stop, electrode dry burning and the like are avoided, the electric energy loss and the electrode loss are reduced, and continuous, high-efficiency and low-energy-consumption chlor-alkali production is realized.

Description

technical field [0001] The invention relates to the technical field of chlor-alkali industry, in particular to a continuous chlor-alkali industrial electrolytic alkali production device and method. Background technique [0002] The chlor-alkali industry is the basic industry of the national economy. Its products are widely used in various fields of the national economy such as agriculture, petrochemical industry, light industry, textile, chemical building materials, electric power, national defense and military industry, etc. It plays a pivotal role in my country's economic development. However, the chlor-alkali industry is a high-energy-consuming industry in my country's petroleum and chemical industries, which is mainly reflected in the power consumption of caustic soda production. Therefore, reducing the energy consumption of electrolysis is of great significance to the sustainable development of the national economy. [0003] As we all know, the main electrochemical rea...

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Problems solved by technology

[0009] 1. After a certain period of electrolysis, it is necessary to stop and change the liquid, and the electrolysis cannot be carried out continuously

[0010] 2. At the beginning of the electrolysis reaction, the concentration of sodium ions differs greatly between the anode chamber and the cathode chamber, and the electrolysis efficiency is not high

At the end of the electrolysis reaction, there may be a reverse concentration difference of sodium ions between the anode chamber and the cathode chamber, resulting in the cessation of the electrolysis reaction and dry burning of the electrodes.

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