MgO催化丙酮气相缩合制3,5-二甲基苯酚的研究

Investigation on Vapor Phase Condensation of Acetone to 3,5-Xylenol by MgO as Catalyst

以MgO固体碱为催化剂,采用加压气固相催化反应装置,对连续流管式反应炉中丙酮气相一步缩合制3,5-二甲基苯酚的反应进行了研究.考察了温度、时间、压力和溶剂等因素对丙酮转化率和产物选择性的影响.实验得出反应适宜的温度为500℃,压力为0.5 MPa;在氢气氛围、空速为2.4 h-1条件下,使用环己烷和水的混合液为反应溶剂时,丙酮单程转化率为42.4%,目标产物3,5-二甲基苯酚的选择性达33.8%.

To obtain 3,5-xylenol by one-step vapor phase condensation of acetone in continuous flow pipe was studied in this paper,which adopts MgO solid base as catalyst with a fixed-bed reactor.The impact of various reaction parameters such as temperature,pressure,time,and solvent were considered.The test results show that MgO catalyst was found to be preferred in condensation of acetone under the optimum conditions of 500 ℃ reaction temperature,and 0.5 MPa reaction pressure.When a mixture of cyclohexane and water used as solvent,the conversion of acetone reached to 42.4% and the selectivity of 3,5-xylenol reached to 33.8% under the conditions of H2 protection and space velocity of 2.4 h-1.