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Integrated conversion of 1-butanol to 1,3-butadiene

机译：1-丁醇向1,3-丁二烯的整体转化

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Renewed interest in production of 1,3-butadiene from non-petroleum sources has motivated research into novel production routes. In this study, we investigated an integrated process comprising 1-butanol dehydration over a γ-Al _(2) O _(3) catalyst to produce a mixture of linear butenes, coupled with a downstream K-doped Cr _(2) O _(3) /Al _(2) O _(3) catalyst to convert the butenes into butadiene. Linear butene yields greater than 90% are achievable at 360 °C in the dehydration step, and single-pass 1,3-butadiene yields greater than 40% are achieved from 1-butene in a N _(2) atmosphere in the dehydrogenation step. In the integrated process, 1,3-butadiene yields are 10–15%. In all cases, linear C4 selectivity is greater than 90%, suggesting that 1,3-butadiene yields could be significantly improved in a recycle reactor. Doping the Cr _(2) O _(3) catalyst with different metals to promote H _(2) consumption in a CO _(2) atmosphere did not have a large effect on catalyst performance compared to an undoped Cr _(2) O _(3) catalyst, although doping with K in an N _(2) -diluted atmosphere and with Ni in a CO _(2) -enriched atmosphere showed slight improvement. In contrast, doping with K and Ca in a CO _(2) -enriched atmosphere showed slightly decreased performance. Similarly, employing a CO _(2) -enriched atmosphere in general did not improve 1,3-butadiene yield or selectivity compared to reactions performed in N _(2) . Overall, this study suggests that an integrated dehydration/dehydrogenation process to convert 1-butanol into 1,3-butadiene could be feasible with further catalyst and process development.
机译：对从非石油来源生产1,3-丁二烯的新兴趣引起了对新颖生产路线的研究。在这项研究中，我们研究了一个集成过程，该过程包括在γ-Al_（2）O _（3）催化剂上进行1-丁醇脱水，以生成线性丁烯的混合物，以及下游的K掺杂Cr _（2）O _（3）/ Al _（2）O _（3）催化剂将丁烯转化为丁二烯。在脱水步骤中，在360°C时，线性丁烯的收率可达到90％以上;在脱水步骤中，在N _（2）气氛中，从1-丁烯中获得的单程1,3-丁二烯收率可达到40％以上。 。在集成过程中，1,3-丁二烯的产率为10-15％。在所有情况下，线性C4选择性均大于90％，表明在循环反应器中1,3-丁二烯的收率可以得到显着提高。与未掺杂的Cr _（2）相比，在Cr _（2）O _（3）催化剂中掺杂不同的金属以促进CO _（2）气氛中的H _（2）消耗对催化剂性能没有太大影响。 O_（3）催化剂虽然在N_（2）稀释的气氛中掺入K，而在CO_（2）富集的气氛中掺入Ni，但显示出轻微的改善。相反，在富含CO_（2）的气氛中掺入K和Ca会显示性能略有下降。类似地，与在N_（2）中进行的反应相比，采用富含CO_（2）的气氛通常不会提高1,3-丁二烯的收率或选择性。总体而言，这项研究表明，通过进一步的催化剂和工艺开发，将1-丁醇转化为1,3-丁二烯的综合脱水/脱氢工艺是可行的。

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