firststagehycrogenation分一段二段Cs ~ 200℃馏分加氢加氢馏secondarystage-Chycrogenation分Cs ~ 200℃一段二段CC6C9C~C6 ~C馏分馏加氢加氢CCs分一段二段Cs ~200℃C6C9C6馅馏分加氢加氢Schema of cracking gasoline fractionation
Schema of cracking gasoline fractionation first stage hycrogenation secondary stage hycrogenation
(3)Aromatization of light hydrocarbon and heavyaromatics tolight aromaticsofaromaticsCyclarproductionbyprocessaromatization oflighthydrocarbon(BP)produced inBritishAromaticsPetroleumwerecompany by catalytic dehydrogenation, oligomerization,cyclization and aromatization of excess and cheap liquefiedpetroleum gas -propane, butane in the world market.Characteristics: (comparison with naphtha reforming)This process is simple, and raw materials need not bepretreatedExtraction unit of aromatics is not used, high puritybenzene can be produced, and yield of by-product hydrogenis high
⚫ Cyclar process of aromatics production by aromatization of light hydrocarbon Aromatics were produced in British Petroleum (BP) company by catalytic dehydrogenation, oligomerization, cyclization and aromatization of excess and cheap liquefied petroleum gas - propane, butane in the world market. ⚫ Characteristics: (comparison with naphtha reforming) This process is simple, and raw materials need not be pretreated Extraction unit of aromatics is not used, high purity benzene can be produced, and yield of by-product hydrogen is high (3) Aromatization of light hydrocarbon and heavy aromatics to light aromatics
二、Separation ofaromaticfractionsAromatic fractions are the mixtures consisting ofaromatics andnon-aromaticsMethod of solvent extractionBenzene, toluene,xylenes were separated from longfractionsMethod of extraction distillationHigh purity single aromatics was separated fromnarrow fractions with high aromatics content
⚫ Aromatic fractions are the mixtures consisting of aromatics and non-aromatics. ⚫ Method of solvent extraction Benzene, toluene, xylenes were separated from long fractions. ⚫ Method of extraction distillation High purity single aromatics was separated from narrow fractions with high aromatics content. 二、 Separation of aromatic fractions
Solvent extractionMethod of industrial productionDiglycol- Udex method:Sulfolane- Sulfolane method:N-methyl pyrrolidone-Axosolvan method:CH3- IFP method:Dimethyl sulfoxideDMSOCH3HaC-S
◼ Method of industrial production – Udex method: Diglycol – Sulfolane method: Sulfolane – Axosolvan method: N-methyl pyrrolidone – IFP method: Dimethyl sulfoxide Solvent extraction DMSO
ExtractiondistillationPrincipleExtraction distillation is the technologicalprocess designed on the basis of the principle ofhydrocarbon vapor pressure decreasing andmixture initial boiling point increasing as thepolar solvent mixing with hydrocarbon
⚫ Principle Extraction distillation is the technological process designed on the basis of the principle of hydrocarbon vapor pressure decreasing and mixture initial boiling point increasing as the polar solvent mixing with hydrocarbon. Extraction distillation