Supercritical alkylation and butene dimerization over sulfated zirconia and iron-manganese promoted sulfated zirconia catalysts

被引:47
作者
Chellappa, AS [1 ]
Miller, RC [1 ]
Thomson, WJ [1 ]
机构
[1] Washington State Univ, Dept Chem Engn, Pullman, WA 99164 USA
关键词
alkylation; butene dimerization; supercritical reaction; sulfated zirconia; dimethyl hexenes;
D O I
10.1016/S0926-860X(00)00774-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Supercritical alkylation and butene dimerization were investigated using sulfated zirconia (SZ) and iron-manganese promoted sulfated zirconia catalysts (SFMZ), as a function of iso-butane/olefin (I/O) ratio and at temperatures between 60 and 155 degreesC. Detailed product analysis demonstrated that while C-8 yields were as high as 80 wt.%, neither catalyst produced significant quantities of trimethyl pentanes, although both had high selectivities to dimethyl hexenes. A comparison of 1-butene versus 2-butene as the olefin feed charge showed that 1-butene first isomerizes to 2-butene, which then produces C-8 products. In all cases, the products consisted primarily of C-8 olefins, which in turn was dominated by dimethyl hexenes. The addition of water at a concentration as low as 1.4 mol% was found to increase dimethyl hexene selectivity (94 wt.%), and lowered the deactivation rate by 30%. The dimerization of a straight 2-butene charge produced a C5+ yield in excess of 90 wt.%, with a 73 wt.% selectivity to dimethyl hexenes. Subsequent regenerations of this catalyst resulted in about 10% conversion loss/generation, but with minimal change in dimethyl hexene selectivities. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:359 / 374
页数:16
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