Epoxidation of 2-Butene from Raffinate 2 Feedstock
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- 作者：Torsten Berndt ; Andreas Kreipl ; Uwe Lenski
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2010
- 出版时间：April 21, 2010
- 年：2010
- 卷：49
- 期：8
- 页码：3957-3960
- 全文大小：132K
- 年卷期：v.49,no.8(April 21, 2010)
- ISSN：1520-5045
文摘
The gas-phase epoxidation of 2-butene (trans or cis) has been conducted in a flow-through reactor at a pressure of 0.5 bar and a temperature of 325 °C using a N2/O2 mixture as the carrier gas. The primary oxidizing agent in the feed gas is ozone. Selectivity to epoxide (trans- and cis-epoxide in total) of about 90% is observed. Investigations using mixtures of trans-2-butene with 1-butene or n-butane revealed a clearly preferred reaction of trans-2-butene. Kinetic analysis of the overall process yielded ratios for the corresponding rate coefficients of k(trans-2-butene)/k(1-butene) = 5.4−7.2 and k(trans-2-butene)/k(n-butane) 67. A few experiments showed a similar behavior for cis-2-butene. Using raffinate 2 (1-butene, 2-butene, n-butane, and iso-butane) as the feedstock for epoxidation, a selective production of 2-butene oxide (trans/cis mixture) is feasible. Additions of methane (1.7−12.5 vol %), H2O vapor (1.7−4.2 vol %), or CO2 (1.7−25 vol %) in the carrier gas do not influence the epoxidation reaction.