化工设计摘要--

350kt/a C4 Comprehensive Utilization Project--Abstract 1. Process Design1. Process Design 1.1Raw Material and Products1.1Raw Material and Products The raw material of this project is C 4 hydrocarbon mixture, whose composition as follows: Table1-1 Composition of Raw MaterialsTable1-1 Composition of Raw Materials Composition i-butane n-butane 1-butylene Cis 2-butene Trans-2-butene i-butene 1,2-butadiene 1,3-butadiene 1-butyne 2-butyne Vinyl acetylene C5 C3 Fraction/wt% 0.4 5.8 37.27 4.0 5.16 1.17 - 45.3 - - 0.7 0.1 0.1 Table1-2 Composition and Specification of ProductsTable1-2 Composition and Specification of Products ItemTest National standard/% Company standard/% 99.7%(wt%) Quality excellent grade excellent grade Production （kt/a） 1631,3-butadieneGB/T13291-2008≥99.50（wt%） propyleneGB/T 7716-2002≥99.60（V/V）99.7%(V/V)145 1 350kt/a C4 Comprehensive Utilization Project--Abstract ethyleneGB/T7715-2003≥99.90 （V/V）99.9%(V/V)first-class32 1.2Process Scheme1.2Process Scheme This project consists of two sections: butadiene extraction and raffinate C 4 catalytic cracking. The section of butadiene extraction is to extract the butadiene from the C4hydrocarbon 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 Produce PFD butadienebutadiene refinerefine extractantextractant C4C4 firstfirst extractionextraction ExtractantExtractant recovery recovery firstfirst strippingstripping secondsecond extractionextraction secondsecond strippingstripping exhaust gasexhaust gas compresscompress purificapurifica tiontion Figure1-2 Raffinate C4 Cracking Produce PFD 2 350kt/a C4 Comprehensive Utilization Project--Abstract De-methanizingDe-methanizing processprocess EthyleneEthylene refiningrefining ethyleneethylene Raffinate C4Raffinate C4 PyrolysisPyrolysis ractionraction Front-endFront-end depropanizationdepropanization processprocess De-ethaneDe-ethane processprocess PropylenePropylene refiningrefining propylenepropylene C4C4、、C5C5 recoveryrecovery Post-treatment processPost-treatment process 1.3Main Innovation of Process1.3Main Innovation of Process (1).C4~C8 olefins can be reacted in the ZSM-5 catalyst. So the C 4~C5 olefins can be recycled to the raw material, which improves the yield coefficient of propylene. (2) We found the best conditions of catalytic cracking reaction from related patent. But the best dimension of the reactor is unknown. For that, we simulated three different aspect ratios of reactor by using Comsol Multiphysics. From the result of simulation, we got the best dimension of reactor. 3 350kt/a C4 Comprehensive Utilization Project--Abstract Figure 1-3 The Result of Simulation by Comsol Multiphysics (3).The control parameter can be optimized by Aspen Dynamics, which has guiding significance for the practical operation. Figure 1-2 Th