Process Design Of Removing Trace Water From Chloromethane By TEG

Methyl chloride as solvent is a very important role in the process of butyl rubber production.The production process of butyl rubber results in trace moisture in chloromethane,and the water not only reduces the degree of polymerization,at the same time affecting the quality of the plastic product.Therefore,how to removing the water in methyl chloride is an important task in the production of butyl.Activated alumina adsorption process is commonly used in butyl rubber production at present,basic can meet the needs of production,but the adsorption capacity of activated alumina adsorption is small,easy to saturation,dry production cycle is short,need frequent regeneration,cause the system stability,the high cost of operation,environment pollution and so on a series of problems.Based on the research and analysis of natural gas dehydration process,this paper puts forward a new process of dehydration by activated alumina after dehydration by triglycol system.Through the simulation software of ASPEN HYSYS process simulation optimization of design,get the new process of key operation parameters,and the process involved in the design of main equipment in detail calculation.Came to the conclusion that by simulation calculation show that the technology is feasible,using glycol method after dehydration,the level of water content in the original methyl chloride system can be from 2000 ?g/g to around 130 ?g/g,the content of triethylene glycol in chloromethane can be controlled below 50 mg/m3.Through the process simulation,it is concluded that the drying period of activated alumina can be greatly prolonged,increase from 72 hours to 400 hours each time,the regeneration times of activated alumina can be reduced,Reduced from 224 to 24 times a year,and the chloromethane system can be more stable;the concentration of the water-saturated rich glycol solution can reach 99.5% after dehydration in the regeneration system,which can be completely recycled Use.Light hydrocarbons from flash evaporation and light components from the top of regeneration tower are recovered to chloromethane system to reduce material loss.