Optimization of ethylene cracker unit feedstock through saturated liquefied petroleum gas separation

Petroleum Refinery Engineering ›› 2025, Vol. 55 ›› Issue (2): 36-40.

Previous Articles Next Articles

Optimization of ethylene cracker unit feedstock through saturated liquefied petroleum gas separation

Sun Yanpeng¹, Sun Xuanyuan²

1.Strategic Business Unit of Chlor-Alkali； 2.Liaoning Petrochemical College, Jinzhou

Online:2025-02-15 Published:2025-02-25

通过饱和液化石油气分离优化乙烯裂解装置原料

孙艳朋¹，孙渲渲²

1.中国中化氯碱事业部； 2.辽宁石化职业技术学院

作者简介:孙艳朋，高级工程师，硕士研究生，2011年毕业于浙江工业大学，从事生产、设备管理工作。E-mail: sypan62@126.com。

Abstract

Abstract:

The unit of a large refining company was limited by the saturated liquefied petroleum gas transportation and storage process, resulting in a high isobutane content in the mixed saturated liquefied petroleum gas, which affected the ethylene yield. By analyzing the composition of saturated liquefied petroleum gas and comparing the energy consumption and equipment size of two liquefied petroleum gas separation processes, front-end depropanization and back-end depropanization, the newly built 850 kt/a saturated liquefied petroleum gas separation unit adopted a three-tower process of depropanization tower, isomerization separation tower, and deethanization tower. The results showed that the ethylene yield of the entire unit increased by 8.23 percentage points, the propylene yield decreased by 1.65 percentage points, and the yield of mixed C4 and cracking gasoline decreased by 5.96 percentage points; the comprehensive energy consumption calibration value of the unit was 29.11 kgoe/t, which was 20.42 kgoe/t lower than the design value. The production operations of the depropanization tower, isomerization separation tower, and deethanization tower of the unit are normal. The separation effect of the towers can meet the normal production requirements, and the product quality is qualified, achieving the goal of optimizing ethylene cracking feedstock, delaying the coking cycle, and increasing ethylene production.

Key words: saturated liquefied petroleum gas, ethylene cracker unit, isobutane content, ethylene yield, front-end depropanization, back-end depropanization, energy consumption

摘要： 某大型炼化公司装置受饱和液化石油气输储流程限制，导致混合饱和液化石油气中异丁烷含量偏高，影响乙烯收率。通过分析饱和液化石油气组成，对比分析前脱丙烷流程和后脱丙烷流程两种液化石油气分离流程方案的能耗、设备尺寸结果后，新增850 kt/a饱和液化石油气分离装置采用脱丙烷塔+正异构分离塔+脱乙烷塔三塔流程。结果表明：全装置产品乙烯收率上升8.23个百分点，丙烯下降1.65个百分点，混合C4及裂解汽油下降5.96个百分点；装置综合能耗标定值为29.11 kgoe/t，比设计值低20.42 kgoe/t。装置的脱丙烷塔、正异构分离塔、脱乙烷塔生产操作正常、塔的分离效果能满足正常生产要求，产品质量合格，实现优化乙烯裂解原料、延缓生焦周期并增产乙烯的目标。

关键词: 饱和液化石油气, 乙烯裂解装置, 异丁烷含量, 乙烯收率, 前脱丙烷, 后脱丙烷, 能耗

Sun Yanpeng, Sun Xuanyuan. Optimization of ethylene cracker unit feedstock through saturated liquefied petroleum gas separation[J]. Petroleum Refinery Engineering, 2025, 55(2): 36-40.

孙艳朋, 孙渲渲. 通过饱和液化石油气分离优化乙烯裂解装置原料[J]. 炼油技术与工程, 2025, 55(2): 36-40.

[1]	Wang Pingping, Hao Taoyuan, Li Guoqing. Research on the new process for low-carbon hydrocarbon steam reforming hydrogen production and operational optimization [J]. Petroleum Refinery Engineering, 2025, 55(1): 16-23.
[2]	Wu Guoqing, Liang Hongyan, Ni Xiaojing. Separation of ethylene feedstock components and simulation optimization of cracking products [J]. Petroleum Refinery Engineering, 2024, 54(9): 34-37.
[3]	Cao Keteng, Du Xiang, Li Hejie . Simulation and optimization of the separation process of dimethoxymethane and methanol by azeotropic distillation with n-pentane [J]. Petroleum Refinery Engineering, 2024, 54(4): 1-5.
[4]	Li Chunxiao, Liu Qianchen, Song Runrun, Long Yihua . Comparison of technical schemes for producing styrene from saturated dry gas and pure ethylene as feedstocks [J]. Petroleum Refinery Engineering, 2024, 54(3): 6-9.
[5]	Lai Fanrong . Technical scheme selection and engineering practice of low-temperature heat utilization in aromatics unit [J]. Petroleum Refinery Engineering, 2024, 54(2): 40-44.
[6]	Chen Zhenjiang. Summary of the Application of FDFCC-Ⅲ Process and Overlapping Two-Stage Regeneration Technology [J]. Petroleum Refinery Engineering, 2024, 54(11): 10-13.
[7]	Pan Long, Zhang Weiqi, Xu Kaijian. Operational analysis of 3.1 MMTPY domestic continuous reforming unit [J]. Petroleum Refinery Engineering, 2024, 54(10): 12-15.
[8]	Xu Renchun, Zhu Ming. Study on energy consumption reduction of rectisol thermal regeneration system by closed thermal pump distillation [J]. Petroleum Refinery Engineering, 2024, 54(10): 57-61.
[9]	Liang Feng . Optimization design of filling process of pipeline hydrogen supply station for refinery enterprise [J]. Petroleum Refinery Engineering, 2024, 54(1): 1-4.
[10]	Yi Jianbin . Study on revamping scheme for running fuel type CCR unit newly adding xylene product seperation process [J]. Petroleum Refinery Engineering, 2023, 53(7): 10-15.
[11]	Zhuang Suqing, Zhao Jianwei, Wang Jinlan, Jiang Yuna . Research on “crude oil to chemical” processing flow and low carbon emissions in refining and chemical enterprises [J]. Petroleum Refinery Engineering, 2023, 53(5): 5-11.
[12]	Li Zhigang . Summary of industrial application of GS-HA catalyst with high activity and low water ratio for ethylbenzene dehydrogenation [J]. Petroleum Refinery Engineering, 2023, 53(5): 46-49.
[13]	Sui Xiupeng, Wang Chunming, Liu Changcheng, Zhong Jianming, Ma Aizeng, Wang Jieguang . Discussion about technical paths of reducing energy consumption in propane dehydrogenation process [J]. Petroleum Refinery Engineering, 2023, 53(4): 1-4.
[14]	Wu Jun . Operation summary of hydrogen system shared by newly-built wax oil hydrogenation unit and diesel hydrogenation unit [J]. Petroleum Refinery Engineering, 2023, 53(3): 15-18.
[15]	Liu Tianbo, Liu Xiaofeng, Jiang Bin . Industrial application of RTO in the wastewater treatment plant [J]. Petroleum Refinery Engineering, 2023, 53(3): 69-72.

Optimization of ethylene cracker unit feedstock through saturated liquefied petroleum gas separation

通过饱和液化石油气分离优化乙烯裂解装置原料

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments