申请人:Honeywell International Inc.
公开号:US07026520B1
公开(公告)日:2006-04-11
Methane is used as the selective dehydrating agent for the production of 2,3,3,3-tetrafluoro-1-propene (R1234yf) from 2,2,3,3,3-pentafluoro-1-propanol. Supported transition metal catalysts are prepared and used for this reaction with high activity. Almost 58% selectivity to R1234yf is obtained at an alcohol conversion level of 60% using unsupported Ni-mesh as the catalyst. Pd and Pt show almost similar level of conversion; however, the selectivity to the desired product is low. The activity of the metal catalyst was found to be a function of the type of support material, activated carbon showing better activity than alumina. Different important process parameters such as temperature, pressure, and contact time are studied to optimize the process. High pressure and temperature are deleterious to the rate of 1234yf formation; yet, the highest yield to 1234yf is obtained while performing a reaction at 494° C. with a contact time of 23 sec.
甲烷被用作选择性脱水剂,用于从2,2,3,3,3-五氟-1-丙醇生产2,3,3,3-四氟-1-丙烯(R1234yf)。支持的过渡金属催化剂经过制备并用于这一反应,具有很高的活性。在酒精转化率为60%时,使用不支持的Ni网作为催化剂,几乎可以获得58%左右的选择性产物R1234yf。Pd和Pt表现出几乎相似的转化率;然而,对所需产物的选择性较低。发现金属催化剂的活性取决于支撑材料的类型,活性炭的活性优于氧化铝。研究了不同重要的工艺参数,如温度、压力和接触时间,以优化该过程。高压和高温对1234yf生成速率有害;然而,在494°C下进行反应,23秒的接触时间内获得了最高的1234yf产量。