Process for the production of chlorinated propenes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-017/25
C07C-017/093
C07C-017/20
C07C-017/06
C07C-017/23
C07C-017/10
출원번호
US-0236275
(2012-08-01)
등록번호
US-8907148
(2014-12-09)
국제출원번호
PCT/US2012/049204
(2012-08-01)
§371/§102 date
20140130
(20140130)
국제공개번호
WO2013/022677
(2013-02-14)
발명자
/ 주소
Tirtowidjojo, Max M.
Fish, Barry B.
Laitar, David S.
출원인 / 주소
Dow Global Technologies LLC
대리인 / 주소
Ruszala, Lois K.
인용정보
피인용 횟수 :
13인용 특허 :
84
초록▼
Processes for the production of chlorinated propenes are provided. The present processes make use of a feedstock comprising 1,2,3-trichloropropane and chlorinates the 1,1,2,3-tetrachloropropane generated by the process prior to a dehydrochlorination step. Production of the less desirable pentachloro
Processes for the production of chlorinated propenes are provided. The present processes make use of a feedstock comprising 1,2,3-trichloropropane and chlorinates the 1,1,2,3-tetrachloropropane generated by the process prior to a dehydrochlorination step. Production of the less desirable pentachloropropane isomer, 1,1,2,3,3-pentachloropropane, is thus minimized. The present processes provide better reaction yield as compared to conventional processes that require dehydrochlorination of 1,1,2,3-tetrachloropropane prior to chlorinating the same. The present process can also generate anhydrous HCl as a byproduct that can be removed from the process and used as a feedstock for other processes, while limiting the production of waste water, thus providing further time and cost savings.
대표청구항▼
1. A process for the production of chlorinated propenes from a feedstream comprising 1,2,3-trichloropropane, wherein at least a portion of the 1,1,2,3-tetrachloropropane produced by a first chlorination step is subjected to a second chlorination step prior to a first dehydrochlorination step and whe
1. A process for the production of chlorinated propenes from a feedstream comprising 1,2,3-trichloropropane, wherein at least a portion of the 1,1,2,3-tetrachloropropane produced by a first chlorination step is subjected to a second chlorination step prior to a first dehydrochlorination step and wherein the second chlorination step is conducted in the presence of a free radical initiator comprising an azo-group and results in the production of a product stream comprising less than 8 molar % hexachloropropane isomers. 2. The process of claim 1, wherein the first chlorination step produces a mixture comprising tetrachloropropanes and pentachloropropanes. 3. The process of claim 2, wherein the mixture is separated to provide a stream comprising the 1,1,2,3-tetrachloropropane. 4. The process of claim 3, wherein the 1,1,2,3-tetrachloropropane is chlorinated in the second chlorination step to provide a mixture comprising 1,1,1,2,3-pentachloropropane and 1,1,2,2,3-pentachloropropane. 5. The process of claim 1, wherein the free radical initiator comprising an azo-group comprises azobisisobutyronitrile, 1,1′-azobis(cyclohexanecarbonitrile), 2,2′-azobis(2,4-dimethyl valeronitrile), and dimethyl 2,2′-azobis(2-methylpropionate), or a combination of these. 6. The process of claim 1, wherein the first chlorination step is conducted in the presence of a free radical initiator or an ionic chlorination catalyst. 7. The process of claim 2, wherein the mixture further comprises unreacted 1,2,3-trichloropropane that is separated and recycled to the first chlorination step. 8. The process of claim 2, wherein the mixture further comprises HCl that is separated and recovered from the process as anhydrous HCl. 9. The process of claim 4, wherein the remainder of the mixture is dehydrochlorinated in the first dehydrochlorination step. 10. The process of claim 9, wherein the dehydrochlorination is conducted in the presence of a dehydrochlorination catalyst. 11. The process of claim 9, wherein the dehydrochlorination step produces a mixture comprising 1,1,2,3-tetrachloropropene, HCl and unreacted pentachloropropanes. 12. The process of claim 11, wherein the unreacted pentachloropropanes are separated and dehydrochlorinated to provide a mixture comprising 1,1,2,3-tetrachloropropene and 2,3,3,3-tetrachloropropene. 13. The process of claim 1, wherein Cl2, SO2Cl2 or combinations of these is/are used as a chlorinating agent in the first and/or second chlorinating steps. 14. The process of claim 4, wherein the second chlorination step also produces HCl and chlorine. 15. A process for preparing 2,3,3,3-tetrafluoroprop-1-ene or 1,3,3,3-tetrafluoroprop-1-ene comprising converting a chlorinated propene prepared by the process of claim 1 into 2,3,3,3-tetrafluoroprop-1-ene or 1,3,3,3-tetrafluoroprop-1-ene.
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