负载磷钨杂多酸催化甲基异丙苯异构化合成间甲基异丙苯的研究
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摘要
在高压釜和固定床反应器中,考察了催化剂的活性及反应的最佳工艺条件,在此基础上进行了催化剂的寿命实验。结果表明:负载型杂多酸催化剂对甲基异丙苯的异构化反应有很好的活性,高温焙烧后Si-B型硅胶作载体时,催化剂的活性最佳。优化试验得到的反应最佳工艺条件为:反应温度125℃,空速小于2 h~(-1),原料甲苯中的水含量小于100μg/g的条件下,产物中甲基异丙苯三种异构体的分布为间甲基异丙苯(m-IPT)∶对甲基异丙苯(p-IPT)∶邻甲基异丙苯(o-IPT)=65.73∶30.81∶3.46,间甲基异丙苯的选择性高,而且邻甲基异丙苯含量低于4%,满足后续吸附分离提纯的进料要求。
The activity of supported phosphotungstic-acid on the isomerization of IPT was studied and the influence of carrier on the activity of catalysts was investigated in autoclave and fix-bed reactors. On these bases, the life test of the catalysts was carried out. The results showed that the supported heteropolyacid could be used as catalyst in the isomerization of IPT, the high-temperature baked SiO_2 which named Si-B was the best carrier for the catalyst. The best operation conditions included that reaction temperature was 125 ℃, WHSV was fewer than 2 h~(-1), the water content of the raw material toluene is less than 100 μg/g, and under these conditions, the ration of three isomers in IPT is m-IPT∶p-IPT∶o-IPT= 65.73∶30.81∶3.46.
The activity of supported phosphotungstic-acid on the isomerization of IPT was studied and the influence of carrier on the activity of catalysts was investigated in autoclave and fix-bed reactors. On these bases, the life test of the catalysts was carried out. The results showed that the supported heteropolyacid could be used as catalyst in the isomerization of IPT, the high-temperature baked SiO_2 which named Si-B was the best carrier for the catalyst. The best operation conditions included that reaction temperature was 125 ℃, WHSV was fewer than 2 h~(-1), the water content of the raw material toluene is less than 100 μg/g, and under these conditions, the ration of three isomers in IPT is m-IPT∶p-IPT∶o-IPT= 65.73∶30.81∶3.46.
引文
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[4] BARMAN S,MAITY S K,PRADHAN N C.Alkylation of toluenewith isopropyl alcohol catalyzed by Ce-exchanged NaX zeolite[J].Chemical Engineering Journal,2005,114:39-45.
[5] SAVIDHA R,PANDURANGAN A.Isopropylation of toluene:acomparative study of microporous zeolites and mesoporous MCM-41 materials[J].Applied Catalysis A:General,2004,276:39-50.
[6]杨书江,唐祥海,朱瑞芝,等.甲苯和丙烯烷基化合成对异丙基甲苯催化剂的研究[J].燃料化学学报,1997,25(4):299-303.
[7]郭汝生,李书纹,刘靖,等.甲苯和丙烯选择烃化合成低邻位异丙基甲苯[J].天然气化工,1995,20(3):39-43.
[8]王岩,李建伟,李英霞,等.β分子筛上甲苯与丙烯烷基化反应的研究[J].化学反应工程与工艺,2010,26(3):248-252.WANG Yan,LI Jianwei,LI Yingxia,et al.Investigation of alkylationof toluone with propylene over beta zeolite catalyst[J].ChemicalReaction Engineering and Technology,2010,26(3):248-252.
[9] OKUHARA T,MIZUNO N,MISONO M.Catalytic chemistry ofheteropoly compounds[J].Advances in Catalysis,1996,41(8):113-252.
[10]凌云,杜泽学,张永强.甲苯与丙烯烷基化反应催化剂和工艺条件的研究[J].化工进展,2003(1):22-29.LING Yun,DU Zexue,ZHANG Yongqiang.Study on the catalystsand process for alkylation of toluene by propylene chemical[J].Industry and Engineering Progress,2003(1):22-29.
[11]温朗友,沈师孔,闵恩泽.在杂多酸催化剂上苯和1十二烯的烷基化合成十二烷基苯[J].催化学报,2000,21(6):529-532.WEN Langyou,SHEN Shikong,MIN Enze.Alkylation of benzenewith 1-dodecene catalyzed by heteropoly acids[J].Chinese Journalof Catalysis,2000,21(6):529-532.
[12] SEHWEGLER M A,BEKKUM H V.Heteropolyaeids as catalystsfor the produetion of phthalate diesters[J].Applied Catalysis,1991,74:191-199.
[13]杜迎春,郭金宝.负载杂多酸催化剂的表征及催化合成乙酸正丁酯的研究[J].石油炼制与化工,2007,38(8):15-18.DU Yingchun,GUO Jinbao.Study on the synthesis of normal butylacetate over silicotungstic acid supported catalystⅡ.synthesis andcharacterization of silicotungstic acid(SiW12)supported catalyst[J].Petroleum Processing and Petrochemicals,2007,38(8):15-18.
[14]何奕工,李奋,王蓬,等.杂多酸催化剂的吸附、酸性和物化性质[J].石油炼制与化工,1996,27(8):12-16.