公开(公告)号：US09296669B2

公开(公告)日：2016-03-29

申请号：US14371069

申请日：2013-01-08

申请人： E.I. DU PONT DE NEMOURS AND COMPANY

发明人： Xuehui Sun ,  Mario Joseph Nappa ,  Haiyou Wang ,  Haluk Kopkalli

IPC分类号： C07C17/25 ,  B01J19/00 ,  B01J19/02 ,  B01J19/24

CPC分类号： C07C17/25 ,  B01J19/002 ,  B01J19/02 ,  B01J19/24 ,  B01J19/2415 ,  B01J2219/00247 ,  B01J2219/0236 ,  B01J2219/0277 ,  B01J2219/0286 ,  C07C21/18

摘要： Disclosed is a process for passivating a surface of a dehydrochlorination reactor comprising: stopping a flow of hydrochlorofluoropropane to a reactor, passing a gas mixture comprising hydrogen gas through the reactor at a temperature of at least 25° C. for a period of time sufficient to restore the selectivity of a dehydrochlorination reaction, stopping the flow of the hydrogen gas mixture, and resuming the flow of hydrochlorofluoropropane to the dehydrochlorination reaction. Also disclosed is a process for producing a fluoropropene of formula CF3CX═CX2, wherein each X is F or H, at least one X is H and at least one X is F, comprising pyrolyzing a hydrochlorofluoropropane of formula CF3CXYCX2Y, wherein each X is F or H, at least one X is H, and at least one X is F and one Y is CI and the other Y is H, in the gas-phase in the absence of a catalyst in a reaction vessel, maintained at a temperature high enough to effect the pyrolysis of said hydrochlorofluoropropane to said fluoropropene, and wherein said reaction vessel is periodically subjected to a passivation step to passivate the inner surface of said reaction vessel. Also disclosed is a process for producing a fluoropropene of formula CF3CX═CX2, wherein each X is F or H, at least one X is H and at least one X is F, comprising pyrolyzing a hydrochlorofluoropropane of formula CF3CXYCX2Y, wherein each X is F or H, at least one X is H, and at least one X is F and one Y is CI and the other Y is H, in the gas-phase in the absence of a catalyst in a reaction vessel, maintained at a temperature high enough to effect the pyrolysis of said hydrochlorofluoropropane to said fluoropropene, and wherein said hydrochlorofluoropropane comprises less than 300 ppm of hydrogen fluoride.

摘要翻译： 公开了一种钝化脱氯化氢反应器的表面的方法，包括：停止氢氯氟丙烷流入反应器，使包含氢气的气体混合物在至少25℃的温度下通过反应器一段足以使 恢复脱氯化氢反应的选择性，停止氢气混合物的流动，并恢复氢氟氯丙烷的流动到脱氯化氢反应。 还公开了制备式CF 3 C X = C X 2的氟丙烯的方法，其中每个X是F或H，至少一个X是H，并且至少一个X是F，包括热解式CF 3 C XYCX 2 Y的氢氯氟丙烷，其中每个X是F 或H，至少一个X为H，至少一个X为F，一个Y为Cl，另一个Y为H，在反应容器中不存在催化剂的气相中，保持在高温 足以使所述氢氯氟丙烷热解为所述氟丙烯，并且其中所述反应容器周期性地进行钝化步骤以钝化所述反应容器的内表面。 还公开了制备式CF 3 C X = C X 2的氟丙烯的方法，其中每个X是F或H，至少一个X是H，并且至少一个X是F，包括热解式CF 3 C XYCX 2 Y的氢氯氟丙烷，其中每个X是F 或H，至少一个X为H，至少一个X为F，一个Y为Cl，另一个Y为H，在反应容器中不存在催化剂的气相中，保持在高温 足以使所述氢氯氟丙烷热解为所述氟丙烯，并且其中所述氢氯氟丙烷包含小于300ppm的氟化氢。