Abstract: Based on the typical properties of saturated liquefied petroleum gas and saturated C5 feedstock processed by an ethylene unit of a petrochemical company, and the simulation results of monomeric hydrocarbon cracking products, the Aspen software was used to design and optimize the component separation process, and to simulate and analyze the cracking products after the separation of the components. The results show that among the main components of saturated liquefied petroleum gas and C5 feedstock, the simulated diene yields of isobutane and isopentane are significantly lower than those of other components. Compared with isohexane, the diene yields are 12.26 and 7.29 percentage points lower, respectively; after the feedstock is optimized, the simulated diene yields of saturated liquefied petroleum gas and C5 feedstock are increased by 5.40 and 6.33 percentage points, respectively; compared with separate cracking, the mixed cracking of the top product of the depropanizer and the bottom product of the debutanizer results in an increase of 0.16 percentage points in ethylene yield and a decrease of 0.20 percentage points in propylene yield. If the goal is to maximize the yield of dienes, it is advisable to choose a separate cracking scheme; compared with the initial operation, when the cracker has been running for 50 days, the diene yields of the top product of the depropanizer and the bottom product of the debutanizer are reduced by 1.13 and 0.50 percentage points, respectively, and the highest surface temperature of the crude tube of the cracker for the top product of the depropanizer is 1098.2℃, which meets the coke burning requirements.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">ethylene feedstock, component separation, cracking products, saturated liquefied petroleum gas, saturated C5, isobutane, isopentane, diene yield

摘要： 基于某石化公司乙烯装置加工饱和液化石油气、饱和C5原料典型性质与单体烃裂解产物模拟结果，利用Aspen软件设计并优化组分离流程，对组分离后原料进行裂解产物模拟分析。结果表明：饱和液化石油气与C5原料主要组分中异丁烷与异戊烷模拟双烯收率明显低于其他组分，与异己烷相比，双烯收率分别低12.26、7.29百分点；原料优化后，饱和液化石油气与C5原料模拟双烯收率分别提高5.40、6.33百分点；脱丙烷塔塔顶产品与脱异丁烷塔塔底产品混合裂解与单独裂解相比，乙烯收率增加0.16百分点，丙烯收率降低0.20百分点，若以双烯收率最大为目标，宜选择单独裂解方案；与运行初期相比，裂解炉运行到第50天时，脱丙烷塔塔顶产品与脱异丁烷塔塔底产品双烯收率分别降低1.13、0.50百分点，脱丙烷塔塔顶产品裂解炉粗管最高表面温度为1098.2℃，满足烧焦要求。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">乙烯原料, 组分离, 裂解产物, 饱和液化石油气, 饱和C5, 异丁烷, 异戊烷, 双烯收率