甲醇制丙烯分离流程的研究与优化
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摘要
以170万吨/年甲醇制丙烯(MTP)实际装置为背景,对MTP分离流程进行了研究和优化,借鉴石脑油乙烯装置分离的经验,并针对MTP产品气的组成特点,优化形成了适合MTP产品气分离的顺序、前脱丙烷和前脱乙烷分别组合装置自身物料做吸收剂的中冷油吸收技术的三种分离流程,省去了乙烯制冷系统。通过对全流程模拟计算数据的对比分析,优选出了前脱乙烷组合装置自身物料做吸收剂的中冷油吸收技术分离流程。对优化组合采用脱乙烷预分离技术、脱甲烷塔尾气回收分凝分馏塔技术、吸收剂物流的选择、碳二分离高度热耦合技术进行了研究,并通过对全流程模拟计算数据的比较分析,优选出了最优化的分离流程,即前脱乙烷中冷油吸收流程组合预分离技术、用自身物流混合碳四做吸收剂、分凝分馏塔回收脱甲烷塔尾气技术和高度热耦合的脱碳二分离技术。在没有乙烯、碳四和碳五循环回MTP反应器及尾气中乙烯损失满足设计要求的前提下,采用此优选分离流程,产品气压缩机和丙烯压缩机双机功率为19.8 MW。
Based on the actual equipment of 1.7 million tons/year methanol to propylene(MTP), this paper studies and optimizes the MTP separation process, draws on the experience of separation of naphtha ethylene unit, and optimizes the formation characteristics of MTP product gas. The process combination, process simulation and optimization of the separation technology are carried out together with de-methanizer tower and its exhaust gasrecovery system, highly thermal coupling decarburization system(de-ethanizer and ethylene rectifying column),sorbent selection, and screen out a more suitable separation technology consisting of the following process unit: pre-cutting front-end deethanizer, recovery of de-methanizer tail gas by combination of intercooling oil absorption andthrottle expansion, highly thermally coupled deethanizer system, take carbon four mixture as absorbing agent, etc.Assuming that there are no ethylene, carbon four and carbon five cycles back to the MTP reactor, the ethylene lossin the exhaust meets the design requirements, using the optimized separation technique, the dual power of thecompressor and propylene compressor is 19.8 MW. The simulation results show that the optimized flow has a good application prospect.
Based on the actual equipment of 1.7 million tons/year methanol to propylene(MTP), this paper studies and optimizes the MTP separation process, draws on the experience of separation of naphtha ethylene unit, and optimizes the formation characteristics of MTP product gas. The process combination, process simulation and optimization of the separation technology are carried out together with de-methanizer tower and its exhaust gasrecovery system, highly thermal coupling decarburization system(de-ethanizer and ethylene rectifying column),sorbent selection, and screen out a more suitable separation technology consisting of the following process unit: pre-cutting front-end deethanizer, recovery of de-methanizer tail gas by combination of intercooling oil absorption andthrottle expansion, highly thermally coupled deethanizer system, take carbon four mixture as absorbing agent, etc.Assuming that there are no ethylene, carbon four and carbon five cycles back to the MTP reactor, the ethylene lossin the exhaust meets the design requirements, using the optimized separation technique, the dual power of thecompressor and propylene compressor is 19.8 MW. The simulation results show that the optimized flow has a good application prospect.
引文
[1] Rothaemel M, Holtmann H D. Methanol to propylene MTP:Lurgi is way[J]. Erdol Erdgas Kohle, 2002, 118(5):234-237.
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[3]胡玉梅.甲醇制丙烯技术应用前景及装置建设相关问题探讨[J].国际石油经济, 2005, 13(9):45-49.Hu Y M. Prospects of MTP application and development of related equipment.[J]. International Petroleum Economics, 2005, 13(9):45-49.
[4]柯丽,冯静,张明森.甲醇转化制烯烃技术的新进展[J].石油化工, 2006, 35(3):205-211.Ke L, Feng J, Zhang M S. Advances in catalytic conversion process of methanol[J]. Petrochemical Technology, 2006, 35(3):205-211.
[5]毛东森,郭强胜,卢冠忠.甲醇转化制丙烯技术进展[J].石油化工, 2008, 37(12):1328-1333.Mao D S, Guo Q S, Lu G Z. Advances in catalytic conversion of methanol to propylene[J]. Petrochemical Technology, 2008, 37(12):1328-1333.
[6]潘澍宇,江洪波,翁惠新.甲醇作为催化裂化部分进料的反应过程[J].化工学报, 2006, 57(4):785-790.Pan S Y, Jiang H B, Weng H X. Reaction of methanol as part of FCC feedstock[J]. Journal of Chemical Industry and Engineering(China), 2006, 57(4):785-790.
[7]朱杰,崔宇,陈元君,等.甲醇制烯烃过程研究进展[J].化工学报, 2010, 61(7):1674-1684.Zhu J, Cui Y, Chen Y J, et al. Recent researches on process from methanol to olefins[J]. CIESC Journal, 2010, 61(7):1674-1684.
[8]吴文章,郭文瑶,肖文德,等.甲醇与C4~C6烯烃共反应制丙烯副产物生成途径[J].化工学报, 2012, 63(2):493-499.Wu W Z, Guo W Y, Xiao W D, et al. Reaction path for formation of by-products in co-reaction of methanol and C4—C6alkenes to propylene[J]. CIESC Journal, 2012, 63(2):493-499.
[9]严丽霞,蒋云涛,蒋斌波,等.移动床甲醇制丙烯技术的工艺与工程[J].化工学报, 2014, 65(1):2-11.Yan L X, Jiang Y T, Jiang B B, et al. Methanol to propylene process using moving bed technology and its engineering study[J].CIESC Journal, 2014, 65(1):2-11.
[10]陈硕,王定博,吉媛媛,等.丙烯为目的产物的技术进展[J].石油化工, 2011, 40(2):217-224.Chen S, Wang D B, Ji Y Y, et al. Development in on-purpose propylene technology[J]. Petrochemical Technology, 2011, 40(2):217-224.
[11]王松汉.乙烯装置技术与运行[M].北京:中国石化出版社有限公司, 2009.Wang S H. Technology and Operation of Ethylene Plant[M].Beijing:China Petrochemical Press Co. Ltd., 2009.
[12]王松汉.乙烯工艺与技术(精化版)[M].北京:中国石化出版社有限公司, 2012.Wang S H. The Production Process and Technology(Essence Edition)[M]. Beijing:China Petrochemical Press Co. Ltd., 2012.
[13]陈明辉,王俭,李勇.国际先进乙烯装置分离技术的进展[J].化学反应工程与工艺, 2005, 21(6):542-550.Chen M H, Wang J, Li Y. Progress in separation technology of world ethylene plant[J]. Chemical Reaction Engineering and Technology,2005, 21(6):542-550.
[14]王子宗.一种从甲醇制丙烯产品气中回收乙烯的系统及方法:201410247261.3[P]. 2017-06-20.Wang Z Z. A system and method for recovering ethylene from gas from methanol to propylene production:201410247261.3[P]. 2017-06-20.
[15]王子宗.一种组合吸收塔、尾气膨胀系统及尾气回收方法:201410462689. X[P]. 2017-09-12.Wang Z Z. A combined absorption tower, tail gas expansion system and tail gas recovery method:201410462689.X[P].2017-09-12.
[16]王松汉.改进的分凝分馏塔系统:1070385C[P].2001-09-05.Wang S H. Improved fractionating and fractionating tower system:1070385C[P]. 2001-09-05.
[17]王子宗,王松汉,李广华.分凝分馏塔工业试验[J].石油化工,2003, 32(S):816-818.Wang Z Z, Wang S H, Li G H. Industrial test of fractionating fractionator[J]. Petrochemical Technology, 2003, 32(S):816-818.
[18]龚旭辉.一种利用甲醇生产丙烯和高辛烷值汽油的方法:201110242549.8A[P].2012-06-20.Gong X H. A method for producing propylene and high octane gasoline by using methanol:201110242549.8A[P].2012-06-20.
[19]李围潮,王松汉.油吸收分离流程的可行性分析和评价[J].乙烯工业, 1999, 11(2):7-11.Li W C, Wang S H. Feasibility analysis and evaluation of oil absorption and separation process[J]. Ethylene Industry, 1999, 11(2):7-11.
[20] Jana A K. Heat integrated distillation operation[J]. Appl. Energ.,2010, 87(5):1477-1494.
[21] Linnhoff B, Dunford H, Smith R. Heat integration of distillation columns into overall processes[J]. Chem. Eng. Sci., 1983, 38(8):1175-1188.
[22] Wright R O. Fractionation apparatus:US 2471134[P]. 1949-05-24.
[23] Petlyuk F B, Platonoy V M, Slavinskii D M. Thermodynamically optimal method for separating multicomponent mixtures[J]. Int.Chem. Eng., 1965, 5:555-561.
[24] Wolff E A, Skogestad S. Operation of integrated three-product(Petlyuk)distillation column[J]. Ind Eng. Chem. Res., 1995, 34(6):2094-2103.
[25] Kaibel G. Distillation columns with vertical partitions[J]. Chem.Eng. Technol., 1987, 10(1):92-98.
[26]刘雪刚,何畅,雷杨,等.基于塔总组合曲线的内部热耦合精馏塔优化设计方法[J].化工学报, 2017, 68(4):1482-1489.Liu X G, He C, Lei Y, et al. Optimized design method for internal heat-integrated distillation columns based on column grand composite curve[J]. CIESC Journal, 2017, 68(4):1482-1489.
[27]常亮,刘兴高.内部热耦合空分塔的节能优化分析[J].化工学报, 2012, 63(9):2936-2940.Chang L, Liu X G. Energy optimization analyses of internal thermally coupled air separation columns[J]. CIESC Journal,2012, 63(9):2936-2940.
[28]李玉刚,王晓红,郑世清,等.含非清晰塔的精馏系统综合[J].化工学报, 2008, 59(2):415-419.Li Y G, Wang X H, Zheng S Q, et al. Synthesis of distillation system consideration no-sharp separation[J]. Journal of Chemical Industry and Engineering(China), 2008, 59(2):415-419.
[2]曹湘洪.重视甲醇制乙烯丙烯的技术开发大力开拓天然气新用途[J].当代石油石化, 2004, 12(12):1-6.Cao X H. Attaching great important to technical development of MTO&MTP, devoting major efforts to explore new application of natural gas[J]. Petroleum&Petrochemical Today, 2004, 12(12):1-6.
[3]胡玉梅.甲醇制丙烯技术应用前景及装置建设相关问题探讨[J].国际石油经济, 2005, 13(9):45-49.Hu Y M. Prospects of MTP application and development of related equipment.[J]. International Petroleum Economics, 2005, 13(9):45-49.
[4]柯丽,冯静,张明森.甲醇转化制烯烃技术的新进展[J].石油化工, 2006, 35(3):205-211.Ke L, Feng J, Zhang M S. Advances in catalytic conversion process of methanol[J]. Petrochemical Technology, 2006, 35(3):205-211.
[5]毛东森,郭强胜,卢冠忠.甲醇转化制丙烯技术进展[J].石油化工, 2008, 37(12):1328-1333.Mao D S, Guo Q S, Lu G Z. Advances in catalytic conversion of methanol to propylene[J]. Petrochemical Technology, 2008, 37(12):1328-1333.
[6]潘澍宇,江洪波,翁惠新.甲醇作为催化裂化部分进料的反应过程[J].化工学报, 2006, 57(4):785-790.Pan S Y, Jiang H B, Weng H X. Reaction of methanol as part of FCC feedstock[J]. Journal of Chemical Industry and Engineering(China), 2006, 57(4):785-790.
[7]朱杰,崔宇,陈元君,等.甲醇制烯烃过程研究进展[J].化工学报, 2010, 61(7):1674-1684.Zhu J, Cui Y, Chen Y J, et al. Recent researches on process from methanol to olefins[J]. CIESC Journal, 2010, 61(7):1674-1684.
[8]吴文章,郭文瑶,肖文德,等.甲醇与C4~C6烯烃共反应制丙烯副产物生成途径[J].化工学报, 2012, 63(2):493-499.Wu W Z, Guo W Y, Xiao W D, et al. Reaction path for formation of by-products in co-reaction of methanol and C4—C6alkenes to propylene[J]. CIESC Journal, 2012, 63(2):493-499.
[9]严丽霞,蒋云涛,蒋斌波,等.移动床甲醇制丙烯技术的工艺与工程[J].化工学报, 2014, 65(1):2-11.Yan L X, Jiang Y T, Jiang B B, et al. Methanol to propylene process using moving bed technology and its engineering study[J].CIESC Journal, 2014, 65(1):2-11.
[10]陈硕,王定博,吉媛媛,等.丙烯为目的产物的技术进展[J].石油化工, 2011, 40(2):217-224.Chen S, Wang D B, Ji Y Y, et al. Development in on-purpose propylene technology[J]. Petrochemical Technology, 2011, 40(2):217-224.
[11]王松汉.乙烯装置技术与运行[M].北京:中国石化出版社有限公司, 2009.Wang S H. Technology and Operation of Ethylene Plant[M].Beijing:China Petrochemical Press Co. Ltd., 2009.
[12]王松汉.乙烯工艺与技术(精化版)[M].北京:中国石化出版社有限公司, 2012.Wang S H. The Production Process and Technology(Essence Edition)[M]. Beijing:China Petrochemical Press Co. Ltd., 2012.
[13]陈明辉,王俭,李勇.国际先进乙烯装置分离技术的进展[J].化学反应工程与工艺, 2005, 21(6):542-550.Chen M H, Wang J, Li Y. Progress in separation technology of world ethylene plant[J]. Chemical Reaction Engineering and Technology,2005, 21(6):542-550.
[14]王子宗.一种从甲醇制丙烯产品气中回收乙烯的系统及方法:201410247261.3[P]. 2017-06-20.Wang Z Z. A system and method for recovering ethylene from gas from methanol to propylene production:201410247261.3[P]. 2017-06-20.
[15]王子宗.一种组合吸收塔、尾气膨胀系统及尾气回收方法:201410462689. X[P]. 2017-09-12.Wang Z Z. A combined absorption tower, tail gas expansion system and tail gas recovery method:201410462689.X[P].2017-09-12.
[16]王松汉.改进的分凝分馏塔系统:1070385C[P].2001-09-05.Wang S H. Improved fractionating and fractionating tower system:1070385C[P]. 2001-09-05.
[17]王子宗,王松汉,李广华.分凝分馏塔工业试验[J].石油化工,2003, 32(S):816-818.Wang Z Z, Wang S H, Li G H. Industrial test of fractionating fractionator[J]. Petrochemical Technology, 2003, 32(S):816-818.
[18]龚旭辉.一种利用甲醇生产丙烯和高辛烷值汽油的方法:201110242549.8A[P].2012-06-20.Gong X H. A method for producing propylene and high octane gasoline by using methanol:201110242549.8A[P].2012-06-20.
[19]李围潮,王松汉.油吸收分离流程的可行性分析和评价[J].乙烯工业, 1999, 11(2):7-11.Li W C, Wang S H. Feasibility analysis and evaluation of oil absorption and separation process[J]. Ethylene Industry, 1999, 11(2):7-11.
[20] Jana A K. Heat integrated distillation operation[J]. Appl. Energ.,2010, 87(5):1477-1494.
[21] Linnhoff B, Dunford H, Smith R. Heat integration of distillation columns into overall processes[J]. Chem. Eng. Sci., 1983, 38(8):1175-1188.
[22] Wright R O. Fractionation apparatus:US 2471134[P]. 1949-05-24.
[23] Petlyuk F B, Platonoy V M, Slavinskii D M. Thermodynamically optimal method for separating multicomponent mixtures[J]. Int.Chem. Eng., 1965, 5:555-561.
[24] Wolff E A, Skogestad S. Operation of integrated three-product(Petlyuk)distillation column[J]. Ind Eng. Chem. Res., 1995, 34(6):2094-2103.
[25] Kaibel G. Distillation columns with vertical partitions[J]. Chem.Eng. Technol., 1987, 10(1):92-98.
[26]刘雪刚,何畅,雷杨,等.基于塔总组合曲线的内部热耦合精馏塔优化设计方法[J].化工学报, 2017, 68(4):1482-1489.Liu X G, He C, Lei Y, et al. Optimized design method for internal heat-integrated distillation columns based on column grand composite curve[J]. CIESC Journal, 2017, 68(4):1482-1489.
[27]常亮,刘兴高.内部热耦合空分塔的节能优化分析[J].化工学报, 2012, 63(9):2936-2940.Chang L, Liu X G. Energy optimization analyses of internal thermally coupled air separation columns[J]. CIESC Journal,2012, 63(9):2936-2940.
[28]李玉刚,王晓红,郑世清,等.含非清晰塔的精馏系统综合[J].化工学报, 2008, 59(2):415-419.Li Y G, Wang X H, Zheng S Q, et al. Synthesis of distillation system consideration no-sharp separation[J]. Journal of Chemical Industry and Engineering(China), 2008, 59(2):415-419.
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