Method for removing moisture from chloroethylene or gas mixture with chloroethylene

A vinyl chloride and mixed gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of increasing energy consumption and high regeneration temperature, and achieve improved operation flexibility, low energy consumption, and simple process flow. Effect
CN101898068AActive Publication Date: 2010-12-01四川开元科技有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
四川开元科技有限责任公司
Publication Date
2010-12-01

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Abstract

The invention relates to a method for removing moisture from chloroethylene or gas mixture with chloroethylene. The method comprises the following steps: sending moisture-contained chloroethylene or gas mixture with chloroethylene from the entrance end into a dryer which is at least filled with macropore silica gel and 5A molecular sieve desiccant; performing adsorption drying under the gauge pressure of 0.30-0.70MPa; obtaining dry chloroethylene or gas mixture product with chloroethylene from the exit end of the dryer, at least heating desiccant in the dryer for desorption and cooling the desiccant to regenerate the desiccant, and performing the next adsorption drying operation repeatedly, wherein the average pore diameter of the silica-gel desiccant is 8.0-10.0nm, the specific surface area is 300-400m<2> / g, the pore volume is 0.8-1.0ml / g and the heat regeneration temperature of the desiccant is 70-150 DEG C. The total moisture content of the gas product dried by the method of the invention is up to (10-100)*10<-6>; and compared with the common drying methods and technologies such as solid caustic soda method, before and subsequent gravity dewatering method and coalescer dewatering and drying method, the method has the advantages of high dewatering accuracy, low operating cost, high recovery rate, more environmental friend and the like.
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Description

technical field

[0001] The invention relates to a method for removing moisture in mixed gas by adsorption, more specifically a method for removing moisture in vinyl chloride (VCM) or mixed gas containing vinyl chloride. Background technique

[0002] In the production process of vinyl chloride (VCM) or polyvinyl chloride (PVC), whether the calcium carbide process or the oxychlorination process is adopted, there is a problem of dehydration and drying of vinyl chloride (VCM). If the water content is high or exceeds the production control index, it is easy to cause adverse consequences such as equipment corrosion, chloride ion pitting and VCM self-polymerization; for the calcium carbide process, it is also easy to cause self-polymerization blockage of the rectification tower, black and yellow spots in PVC and "fish". The number of "eyes" increases, which seriously affects the quality of PVC. There is a consensus on the harm of water in vinyl chloride at home and abroad, so it i...

Claims

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