作者:Janne Leiner、Achim Stolle、Bernd Ondruschka、Thomas Netscher、Werner Bonrath
DOI:10.3390/molecules18078358
日期:——
Linalool is an important intermediate for syntheses of isoprenoid fragrance compounds and vitamins A and E. One process option for its production is the thermal gas-phase isomerization of cis- and trans-pinan-2-ol. Investigations of this reaction were performed in a flow-type apparatus in a temperature range from 350–600 °C and a residence time range of 0.6–0.8 s. Rearrangement of the bicyclic alcohol led to linalool, plinols arising from consecutive reactions of linalool and other side products. Effects of residence time, temperature, surface-to-volume-ratio, carrier gas, and the presence of additives on yield and selectivity were studied. Furthermore, the effects of such parameters on ene-cyclization of linalool affording plinols were investigated. Results indicate that manipulation of the reaction in order to affect selectivity is difficult due to the large free path length to other molecules in the gas phase. However, conditions have been identified allowing one to increase the selectivity and the yield of linalool throughout pyrolysis of pinan-2-ol.
芳樟醇是合成类异戊二烯香料化合物以及维生素 A 和 E 的重要中间体。其生产的一种工艺选择是顺式和反式蒎烷-2-醇的热气相异构化。该反应的研究是在流动式装置中进行的,温度范围为 350-600 °C,停留时间范围为 0.6-0.8 秒。双环醇的重排产生了芳樟醇,由芳樟醇和其他副产物的连续反应产生的普林醇。研究了停留时间、温度、表面积与体积比、载气和添加剂的存在对产率和选择性的影响。此外,还研究了这些参数对提供普林醇的芳樟醇烯环化的影响。结果表明,由于气相中其他分子的自由程长度较大,因此很难控制反应以影响选择性。然而,已经确定了允许在蒎烷-2-醇热解过程中提高芳樟醇的选择性和产率的条件。