摘要 |
Disclosed are processes for the production of fluorinated olefins, preferably adapted to commercialization of CF<SUB>3</SUB>CF=CH<SUB>2</SUB> (1234yf). Three steps may be used in preferred embodiments in which a feedstock such as CCI<SUB>2</SUB>=CCICH<SUB>2</SUB>CI (which may be purchased or synthesized from 1,2,3- trichloropropane) is fluorinated (preferably with HF in gas-phase in the presence of a catalyst) to synthesize a compound such as CFaCCl=CH2, preferably in a 80-96% selectivity. The CF<SUB>3</SUB>CCl=CH<SUB>2</SUB> is preferably converted to CF<SUB>3</SUB>CFClCH<SUB>3</SUB> (244-isomer) using a SbCl<SUB>5</SUB> as the catalyst which is then transformed selectively to 1234yf, preferably in a gas-phase catalytic reaction using activated carbon as the catalyst. For the first step, a mixture Of Cr2O3 and FeCl<SUB>3</SUB>/C is preferably used as the catalyst to achieve high selectivity to CF<SUB>3</SUB>CCl=CH<SUB>2</SUB> (96%). In the second step, SbCl<SUB>5</SUB>/C is preferably used as the selective catalyst for transforming 1233xf to 244-isomer, CF<SUB>3</SUB>CFClCH<SUB>3</SUB>. The intermediates are preferably isolated and purified by distillation and used in the next step without further purification, preferably to a purity level of greater than about 95%. |
申请人 |
HONEYWELL INTERNATIONAL INC.;TUNG, HSUEH, SUNG;MUKHOPAHYAY, SUDIP;VAN DER PUY, MICHAEL;MA, JING, JI;BORTZ, CHERYL;LIGHT, BARBARA;PHILLIPS, STEVEN, D.;DUBEY, RAJESH;MERKEL, DANIEL, C. |
发明人 |
TUNG, HSUEH, SUNG;MUKHOPAHYAY, SUDIP;VAN DER PUY, MICHAEL;MA, JING, JI;BORTZ, CHERYL;LIGHT, BARBARA;PHILLIPS, STEVEN, D.;DUBEY, RAJESH;MERKEL, DANIEL, C. |