通过石脑油正异构分离装置提高炼化一体化工程经济效益的研究

A Study into Improving Economic Benefits of Integrated Refining and Chemical Projectsthrough Naphtha Normal and Isomeric Hydrocarbon Separation Units

炼化一体化工程一般将直馏石脑油作为蒸汽裂解装置和催化重整装置的原料,虽然催化重整和蒸汽裂解装置的原料都是石脑油,但两个装置对于原料组成的要求却差别很大,石脑油正异构分离装置可同时优化催化重整和蒸汽裂解装置的原料,使石脑油的利用效率达到最优。该技术可以分别为两个装置提供适宜的原料,将石脑油分离为富含正构烷烃的抽出液和富含非正构烷烃的抽余液,抽出液是优质的蒸汽裂解原料,而抽余液的芳烃潜含量较高,是优质的催化重整原料。本文探讨了通过该装置提高全厂经济效益的可行性,石脑油正异构分离装置分离出的抽出液中,正构烷烃含量为93.0%;抽余液中分离出的轻石脑油中,异构烷烃、环烷烃和芳烃的含量高达84.9%,C6~C10组分的芳烃潜含量为49.0%。与基础方案相比,抽出液做蒸汽裂解原料可以提高乙烯收率47.16%,轻石脑油的RON值提高12个单位,达到80左右,C6~C10组分进催化重整装置可以提高对二甲苯收率14.09%。

Integrated refining and chemical units typically use straight-run naphtha as the feedstock for steam cracking units and catalytic reforming units.Although both catalytic reforming units and steam cracking units use naphtha as raw material,the two types of units have dramatically different requirements for the composition of feedstock.A naphtha normal and isomeric hydrocarbon separation unit can simultaneously optimize catalytic reforming and steam cracking feedstock to maximize the efficiency of use of naphtha.The technology can provide feedstock for both types of units and separate naphtha into an extract rich in normal alkane and the raffinate rich in isoalkane.The extract is an excellent steam cracking raw material and the raffinate has the highest potential content of arene,making it an excellent raw material for catalytic reforming.This article analyzes the feasibility of improving the factory ′ s economic efficiency through that unit.Normal alkane represents 93.0% of the extract separated by the normal and isomeric hydrocarbon separation unit and isoalkane,cycloalkane and arene account for as high as 84.9% of the light naphtha separated from the raffinate.The potential content of arene in C6-C10 components is 49.0%.Compared with the basic scheme,using the extract as the feedstock for steam cracking increases ethylene yield by 47.16% and the RON of light naphtha increases by 12 units to about 80.The entry of C6-C10 components into the catalytic reforming unit increases the yield of paraxylene by 14.09%.