Chlorine zero-pressure control method applied to process for preparing alkali by utilizing zero-pole ionic membrane electrolytic cell

Abstract

The invention discloses a chlorine zero-pressure control method applied to a process for preparing alkali by utilizing a zero-pole ionic membrane electrolytic cell. In the method, zero-pole ionic membrane electrolytic cell, a chlorine safety water seal, a hydrogen safety water seal, a chlorine drying device, a 3K chlorine compressor and a hydrogen compressor which are sequentially connected are utilized; the difficulty that accidental injuries occur on elastomers and iconic membranes caused by the abnormal chlorine header pipe pressure difference and negative pressure difference occurrence when the iconic membrane device is in a normal production state and in an emergent condition is solved by setting the pressure of the chlorine generated by refining salt water though electrolysis of the zero-pole iconic membrane electrolytic cell into (0+ / -12) kPa, and the hydrogen pressure into (4+ / -2) kPa, thus lowering the equipment operation cost, improving the equipment use ratio and increasing the economic benefits. The method provided by the invention can be widely applied into the iconic membrane alkali production process, especially the method for producing the alkali by utilizing the high-current density zero-pole iconic membrane electrolytic cell.

Description

Technical field: [0001] The invention relates to a zero-pole-distance sub-membrane electrolytic cell alkali-making process using chlorine gas zero pressure control method, and is particularly suitable for the high-current-density zero-pole-distance sub-membrane electrolytic cell electrolytically refined brine soda making process. Background technique: [0002] In the production process of ionic membrane electrolysis, energy consumption is an important part of the cost. In order to reduce energy consumption, it is necessary to obtain high current efficiency and low cell voltage, and to maintain low power consumption under high current density. The zero-pole distance sub-membrane electrolysis alkali production technology is recognized worldwide as the most advanced production technology and the most economical alkali production method because of its low energy consumption, high product quality, and pollution-free and many other advantages. [0003] The anode of the zero-pole-d...

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Problems solved by technology

[0006] The invention solves the problems in the prior art that the elastic body of the zero-pole-distance electrolytic cell is deformed under pressure and the ion membrane is damaged due to the abnormal pressure difference in the normal production and emergency of the electrolytic cell, and further provides a method that can avoid the chlorine main pipe The method of effectively protecting the elastomer and ion membrane of the electrolytic cell due to pressure fluctuations and negative pressure differences

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