Objective The aims are to analyze the problems of tert-amyl alcohol accumulation in the methanol recovery column and oil entrainment in the bottom discharge of the methanol extraction column during the operation of the catalytic light gasoline etherification units,and to propose solutions.Methods For the problem of tert-amyl alcohol accumulation in the methanol recovery tower,the following measures were mainly taken to deal with:(1)Reduced the temperature difference between the feed tray and the top of the methanol recovery column.(2)The tert-amyl alcohol was extracted from the side stream of the methanol recovery column.(3)Reduced the mass fraction of tert-amyl alcohol in the feed of the methanol recovery column.The following measures were mainly taken to solve the problem of oil in the bottom discharge of methanol extraction tower:(1)Reduced the content of harmful substances in the feed of alcohol containing light gasoline.(2)Reduced the content of harmful substances in the methanol extraction column.(3)Optimized the structure of the light gasoline feed distributor.Results After taking the above measures,the occurrence of methanol recovery column flooding and flushing accidents caused by the accumulation of tert-amyl alcohol in the column were significantly reduced,the generation of by-products was reduced,and the product quality was improved.The amount of oil in the bottom discharge of the methanol extraction column was effectively reduced,and product loss and environmental pollution caused by a large amount of light gasoline being discharged into the flare through the methanol recovery column reflux drum were avoided.Conclusions After optimizing the process flow and operating conditions,accidents such as the accumulation of tert-amyl alcohol in the column and oil entrainment in the bottom discharge of the methanol extraction column can be effectively reduced,ensuring the long-term stable operation of the units.
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