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Process and device for preparing alkali by full-brine mechanical steam recompression method

A mechanical steam and recompression technology, which is applied in the field of industrial soda production, can solve the problems of electrolytic cell current efficiency drop, heat energy loss, and large footprint, so as to reduce the dependence on boiler equipment, reduce the dependence on boiler equipment, and occupy an area of ​​equipment The effect of less area

Active Publication Date: 2013-01-02
广州新普利节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used multi-effect vacuum evaporation brine concentration equipment has a large volume, a large floor area, and a low chance of reusing the final effect steam after being absorbed, resulting in a large amount of heat loss and high energy consumption.
Moreover, the use of raw steam as a heat source for evaporation requires supporting boilers and other equipment, which causes great pollution
In addition, in the existing ionic membrane alkali production process, most of the sulfate radicals are removed by the poisonous and harmful BaCl2 method, which causes large pollution, high cost, and difficult to control the purification quality; however, iodide ions in brine are rarely removed. When the iodine ion concentration in the battery exceeds the requirement of the ionic membrane, it is easy to produce insoluble periodate and deposit on the ionic membrane. Long-term operation will cause the accumulation of iodine, resulting in a decrease in the current efficiency of the electrolytic cell and affecting the service life of the ionic membrane.

Method used

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  • Process and device for preparing alkali by full-brine mechanical steam recompression method
  • Process and device for preparing alkali by full-brine mechanical steam recompression method

Examples

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Effect test

Embodiment 1

[0039] Please refer to figure 1 , the whole brine mechanical steam recompression method alkali making process of the present invention comprises the following steps:

[0040] 1) One-time refining of brine: put caustic soda-soda ash into raw brine to make Ca 2+ , Mg 2+ 、Ba 2+ 、Al 3+ 、Sr 2+ Metal ions react chemically to form precipitates, thereby removing Ca 2+ , Mg 2+ 、Ba 2+ 、Al 3+ 、Sr 2+ and other metal ions;

[0041]2) Secondary refining of brine: the brine after primary refining is sent to the chelating resin tower for ion exchange to further remove Ca 2+ , Mg 2+ 、Ba 2+ 、Al 3+ 、Sr 2+ Wait for metal ions, reduce the concentration of metal ions in brine, and meet the requirements of entering the ion-exchange membrane electrolyzer;

[0042] 3) Nanofiltration membrane separation and concentration: After step 2), the brine treated in step 2) is first adjusted to a pH between 5-8 and a temperature between 20-38°C, and then separated and concentrated through a nanof...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that after the brine is firstly refined, the precipitated salts and impurities are firstly filtered and purified through a tubular membrane filter, and then the brine is secondarily refined.

Embodiment 3

[0052] The difference between this example and Example 1 is that in order to protect the ion-exchange membrane electrolyzer and prolong its service life, the brine evaporated and concentrated in step 7) was first adjusted to a pH of 11 and a temperature of 65°C before electrolysis.

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Abstract

The invention discloses a process for preparing alkali by a full-brine mechanical steam recompression method. The process comprises the steps as follows: refining the brine at the first time; refining the brine at the second time; separating and concentrating via a nanofiltration membrane; mixing the refined brine and light salt brine; preheating and heating the mixed saline; mechanically recompressing the mixed saline under steam so as to circularly evaporate; transferring the evaporated and concentrated saline into an ionic exchange membrane cell; taking out the light salt brine from the ionic exchange membrane cell; and carrying out dechlorinating and iodine removing on the light salt brine; and then mixing with the refined brine; and recycling. The invention also discloses a device for achieving the technology. Compared with the prior art, the alkali preparing process provided by the invention is low in cost, low in energy consumption, and long in service life of equipment.

Description

[0001] technical field [0002] The invention relates to the technical field of industrial soda production, in particular to a soda production process and device by mechanical vapor recompression of full brine. [0003] Background technique [0004] Caustic soda, hydrogen, chlorine, and hydrochloric acid produced by the soda industry are basic chemical raw materials. The existing caustic soda manufacturing process is generally divided into diaphragm method and ionic membrane method. Compared with the diaphragm method, the ionic membrane method has the advantages of high purity, low energy consumption, and low pollution, and is widely used. [0005] At present, in the ion-exchange membrane caustic soda production process, the electrolyzer requires the concentration of sodium chloride in the feed brine to be 305-315g / L, and the electrolyzer also has strict control requirements for other impurities, such as calcium, magnesium, barium, iron and other metals The total mass con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/34C25B1/46C01D3/06C01D3/14
Inventor 莫新来莫明光陈胜利何睦盈谭子斌覃涛
Owner 广州新普利节能环保科技有限公司
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