Method for separating normal alkane from full fraction naphtha

Abstract

The full fraction naphtha is first treated via one adsorption and separation process to separate out arene, and then treated via one other adsorption and separation process to separate normal alkane from non-normal alkane. The naphtha component obtained through adsorption and separation process and with rich normal alkane is used as material for steam cracking equipment to raise the ethylene yield; the component with rich non-normal alkane is used as material for catalytic re-former to increase the yield of reformed gasoline or arene; and the component with rich arene is used as material for coking or reforming apparatus. The two adsorption and separation processes have efficient desorbing agent adopted for regenerating the adsorption saturated adsorbent for reuse.

Description

technical field

[0001] The invention is a method for adsorbing and separating normal paraffins, in particular, a method for adsorbing and separating normal paraffins from whole cut naphtha. Background technique

[0002] It is estimated that the global demand for ethylene will grow at an annual rate of 4-5% in the next few years, and petrochemical companies will meet the increasing demand for ethylene by transforming existing devices or building new devices. At present, steam cracking is the main means of producing ethylene. More than 50% of the steam cracking units use liquid hydrocarbon raw materials. Among them, the commonly used raw material naphtha is a mixture of various hydrocarbons, which can be cracked into various cracking products, of which only The cracking products of linear alkanes are light alkenes. Therefore, to increase the ethylene yield of the cracking unit, the raw materials used should be mainly n-paraffins. The yield of ethylene in the cracking product...

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