1-Hexene was ethoxylated with ethanol and ethanol–water mixtures mimicking bioethanol in a liquid phase, continuous flow process over a fixed bed of zeolite beta catalyst at a reaction temperature of 423 K and a pressure of 6 MPa. The selectivity for ethoxy alkanes on a hexene basis exceeded 90%. GC-MS, 1H & 13C-NMR and 13C DEPT NMR confirmed the main reaction products to be 2-ethoxy hexane and 3-ethoxy hexane in molar ratio 20 : 1. Side products were diethyl ether from ethanol and dodecenes and hexanol from 1-hexene. Under optimized reaction conditions, the catalyst was stable for at least 14 hours on-stream. The 2-ethoxylation activity of 1-alkenes by zeolite beta was confirmed in reactions with 1-octene and 1-decene. 1-Alkenes can be synthesized out of biomass via conversion into synthesis gas and the Fischer–Tropsch process. The here presented ethoxylation process could contribute green chemicals to the diesel pool and presents a pathway for synthesis of high boiling solvents.
1-己烯在423 K的反应温度和6 MPa的压力下,使用以
乙醇和模仿
生物乙醇的
乙醇-
水混合物进行液相、连续流动反应,通过固定床的β
沸石催化剂进行反应。以己烯为基础的乙氧
烷烃选择性超过90%。GC-MS、1H和13C NMR以及13C
DEPT NMR确认主要反应产物为2-乙氧己烷和3-乙氧己烷,其摩尔比为20:1。副产品包括来自
乙醇的二
乙醚,以及来自
1-己烯的
十二烯和
己醇。在优化的反应条件下,催化剂至少在在线状态下稳定14小时。通过与1-
辛烯和1-
癸烯的反应确认了β
沸石对1-烯烃的2-乙氧化活性。1-烯烃可以通过转化为合成气和费托合成工艺从
生物质中合成。这里提出的乙氧化过程可以为柴油池贡献绿色
化学品,并为高沸点溶剂的合成提供了一条途径。