35万吨C4综合利用项目 Shangchuan--Abstract.docVIP

350kt/a C4 Comprehensive Utilization Project--Abstract  PAGE \* MERGEFORMAT 10 350kt/a C4 comprehensive utilization project With the rapid development of ethylene industry, the C4 produced in catalytic cracking process is more and more excessive. However, the using efficiency of C4 at home is still in a low level. So, finding a better comprehensive utilization method of C4 has became a problem that needed to be solved straightly. This project aims to design a C4 comprehensive utilization branch plant for Xinjiang Dushanzi Petrochemical Corporation. Our raw material of C4 comes from the project of 1000kt/a steam cracking of Xinjiang Dushanzi Petrochemical Corporation. The product scheme of this project is producing 163kt/a butadiene, 145kt/a propylene and 32kt/a ethylene. 1. Process Design 1.1Raw Material and Products The raw material of this project is C4 hydrocarbon mixture, whose composition as follows: Table1-1 Composition of Raw Materials CompositionFraction/wt%i-butane0.4n-butane5.81-butylene37.27Cis 2-butene4.0Trans-2-butene5.16i-butene1.171,2-butadiene-1,3-butadiene45.31-butyne-2-butyne-Vinyl acetylene0.7C50.1C30.1Table1-2 Composition and Specification of Products ItemTest methodNational standard/%Company standard/%QualityProduction（kt/a）1,3-butadieneGB/T13291-2008≥99.50（wt%）99.7%(wt%)excellent grade163propyleneGB/T 7716-2002≥99.60（V/V）99.7%(V/V)excellent grade145ethyleneGB/T7715-2003≥99.90（V/V）99.9%(V/V)first-class321.2Process Scheme This project consists of two sections: butadiene extraction and raffinate C4 catalytic cracking. The section of butadiene extraction is to extract the butadiene from the C4 hydrocarbon mixture raw material, which consists of double extracting, double stripping and butadiene purification. The section of catalytic cracking consists of catalytic cracking and separating, which produced polymer grade propylene and ethylene. Figure1-1 Butadiene Extraction Prod