Process for producing n-hexane by using reformate raffinate oil

Abstract

The invention relates to a process for producing n-hexane by using reformate raffinate oil. After the raffinate oil is pre-treated in a C5 decarbonization tower, low-boiling mixed C5 light components are distilled from the top of the C5 decarbonization tower; mixed C6 and C7 components at the bottom of the C75 decarbonization tower enter into a C7 decarbonization tower; after the mixed C6 and C7 components are treated in the C7 decarbonization tower, mixed C7 components are discharged from the bottom of the C7 decarbonization tower; unseparated mixed components enter into a C6 decarbonization tower from the top of the tower; after treatment in the C6 decarbonization tower, distillates at the top of the C6 decarbonization tower are mixed C6 components, a mixture at the bottom of the C6 decarbonization tower enters into an extractive distillation tower; a fraction at the top of the extractive distillation tower is high pure n-hexane, a mixture at the bottom of the extractive distillation tower enters into a solvent recovery tower; a distillate at the top of the solvent recovery tower is methylcyclopentane and a distillate at the bottom of the solvent recovery tower is an extraction agent which can be reused. The process solves the problems of comprehensive utilization of the reformate raffinate oil of an oil refinery, and increases deep processing level of oil products. A concentration of n-hexane can reach over 95%; and simultaneously, the mixed C5, mixed C6 and mixed C7 components are recycled.

Description

technical field [0001] The invention relates to a process method for comprehensive utilization of reformed raffinate oil. Specifically, the process of producing high-purity n-hexane is based on the reformed raffinate of the refinery as the raw material. Background technique [0002] n-Hexane is one of the most widely used hydrocarbon solvents in industry, and also one of the most representative non-polar solvents. As an important solvent and chemical raw material, it has been widely used in polymer materials, rubber, industrial medicine, Chemical, electronic and food analysis industries. [0003] High-purity n-hexane is an advanced solvent and diluent for pharmaceutical synthesis reactions, such as the preparation of steroids such as acetoxyethyl ester, cephalosporins, hormones and other sterile drugs. With the rapid development of biogenetic engineering, pharmaceutical engineering and other related fields at home and abroad, the market demand for high-purity n-hexane will...

AI Technical Summary

Problems solved by technology

[0004] The octane number of reformed raffinate is relatively low, generally only about 60. Currently, it cannot be used as motor gasoline. It can only be added in a small amount for blending. The utilization rate is low. Therefore, a comprehensive utilization of reformed raffinate is developed. technology is particularly important

The reformed raffinate contains n-hexane with a relatively high concentration (molar concentration greater than 10%). At present, it is obtained from straight-run or raffinate by rectification or double-tower separation of hydrogenation and concentration of platinum reformed raffinate The method of n-hexane is quite mature, but its purity is within 60%~90%. If it is further separated by ordinary rectification method, the energy consumption will be too large. Therefore, a new separation process of n-hexane is developed. The final high-purity n-hexane product can not only meet the demand for n-hexane in the domestic organic solvent market, but also effectively utilize reformed gasoline for deep processing and solve the problem of resource utilization, which has high social and economic benefits

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