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With the rapid development of the national economy, the domestic demand for PVC is growing surge. PVC booming demand and supply driven to provide raw materials for its production of chlor-alkali industry, the rapid development of the end of the 20th century to the beginning of the 21st century, China's accession to the WTO, the chlor-alkali industry, with other industry gradually with the international standards, the formation of diaphragm caustic soda and ion-exchange membrane soda coexist, the overall size of my caustic soda plant has reached an annual output of 1,000 tons of caustic soda, has surpassed the United States, ranking first in the world, the brine purification technology changes naturally Development. The process of refining brine is one of the main processes of the caustic soda in the production process, the electrolysis of brine used in chlor-alkali industry diaphragm electrolyzer or ion-exchange membrane electrolyzer operating life, the technical and economic indicators is closely related to the quality of brine into the groove. Saline quality is directly related to the production of electricity consumption, the ion-exchange membrane life. The chlor-alkali industry has been the pursuit of the goals to improve the quality of brine. Traditional flocculation and sedimentation processes, calcium, magnesium and insoluble matter removal is not ideal, is a major problem affecting the electric groove running indicators. In recent years, \outstanding contributions, hailed as a revolution in Chinese chlor-alkali refining brine. The only drawback is that the membrane filtration process in the production practice found the preprocessor and membrane filter device structure, the filtration process is not reasonable, and there is more or less affect the production of stable and production cost. I combine course work and practical work practice, a systematic analysis of the actual production of domestic production unit of membrane filtration process under the guidance of instructors and the help of the chlor-alkali industry experts, clear of the subject technology research direction: the membrane filter and pre- processor device structure design, filtration process change theory research and application development, introduction of the innovation process, from continuously validate and improve production practices, to find solutions to practical membrane filtration actual production, economic rationality . The effect of the process through a large number of engineering practice, been shown to have stable brine quality, easy to operate, energy-saving, protecting seed by membrane filtration ability, and advanced process control for the user to save the investment and operating costs. The chlor-alkali enterprises apply this innovative technology has reached more than 10, new HVM film saline devices will be the main push of the innovation process. The same time, this technology has been concern by the chlor-alkali production enterprises abroad, foreign chlor-alkali project have chosen this technology. Expect the results of this research have a certain reference value of the chlor-alkali industry production enterprises brine refining device design, technical innovation and production. With this technology more and more of the actual production device operation, its users in the production and management bring significant economic benefits. Valuable practical experience gained from the practice of many user productivity will promote continued innovation of brine refining technology, to make a greater contribution to the development of the chlor-alkali industry.
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