Process for the separation of HF via Azeotropic distillation
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-003/00
C07C-017/00
출원번호
US-0226737
(1988-08-01)
발명자
/ 주소
Manzer Leo E. (Wilmington DE) Rao V. N. Mallikarjuna (Wilmington DE) Rockwell Richard T. (Corpus Christi TX) Sisk Michael A. (Corpus Christi TX) Warwas Edwin J. (Wilmington DE) Winteringham Roy (Hock
출원인 / 주소
E. I. DuPont de Nemours and Company (Wilmington DE 02)
인용정보
피인용 횟수 :
16인용 특허 :
6
초록
Process for the separation of hydrogen fluoride (HF), 2,2-dichloro-1,1,1-trifluoroethane (FC-123), and/or 2-chloro-1,1,1,2-tetrafluoroethane (FC-124) from mixtures containing them by controlling the molar ratio of HF/FC-123 in the mixture prior to subjecting the mixture to azeotropic distillation.
대표청구항▼
A process for the separation of hydrogen fluoride from an initial mixture which comprises hydrogen fluoride and either 2,2-dichloro-1,1,1-trifluoroethane or both 2,2-dichloro-1,1,1-trifluoroethane and 2-chloro-1,1,1,2-tetrafluoroethane, comprising the steps of: (a) controlling the molar ratio of hyd
A process for the separation of hydrogen fluoride from an initial mixture which comprises hydrogen fluoride and either 2,2-dichloro-1,1,1-trifluoroethane or both 2,2-dichloro-1,1,1-trifluoroethane and 2-chloro-1,1,1,2-tetrafluoroethane, comprising the steps of: (a) controlling the molar ratio of hydrogen fluoride to 2,2-dichloro-1,1,1-trifluoroethane in said initial mixture by adding 2,2-dichloro-1,1,1-trifluoroethane when the molar ratio of hydrogen fluoride to 2,2-dichloro-1,1,1-trifluoroethane is greater than about 1.3:1, thereby providing said initial mixture with a molar ratio of hydrogen fluoride to 2,2-dichloro-1,1,1-trifluoroethane of 1.3:1, or less; (b) separating the initial mixture provided in step (a) by azeotropic distillation in a distillation column having a temperature of from about 50°C. to 300°C. and a pressure of from about 0.10 MPa to about 4.0 MPa at the bottom of the column; (c) removing top products from the distillation column which contain a portion of the 2,2-dichloro-1,1,1-trifluoroethane from the initial mixture provided in step (a) and substantially all of the hydrogen fluoride from the initial mixture provided in step (a) and which comprise at least one low-boiling azeotrope selected from the group consisting of azeotropes of hydrogen fluoride and 2,2-dichloro-1,1,1-trifluoroethane, azeotropes of hydrogen fluoride and 2-chloro-1,1,1,2-tetrafluoroethane, and azeotropes of hydrogen fluoride and both 2,2-dichloro-1,1,1-trifluoroethane and 2-chloro-1,1,1,2-tetrafluoroethane; and (d) removing bottom products from the distillation column which are substantially free of hydrogen fluoride and which comprise 2,2-dichloro-1,1,1-trifluoroethane; wherein sufficient 2,2-dichloro-1,1,1-trifluoroethane is withdrawn from the bottom of the distillation column to maintain said temperature and pressure.
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이 특허에 인용된 특허 (6)
Abel Michel (Pierre-Benite FRX) Fine Francois (St. Laurent de Mure FRX) Foulletier Louis (Oullins FRX) Verot Yvan (Ecully FRX), Continuous process for the gaseous-phase preparation of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochlo.
Merchant Dhirendra Ranchhoddas (Paducah KY) Hodges Jimmie Ray (Benton KY), Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride.
Scott, John David; Blake, Charles Brian; Ewing, Paul Nicholas; Hunns, Jeremy Charles Bauser; Toplis, Steven; Irwin, Andrew Neil; Spruce, Mark, Apparatus for vaporization of liquids.
Pham Hang Thanh ; Singh Rajiv Ratna ; Shankland Ian Robert ; Tung Hsueh Sung, Azeotrope-like composition of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride.
Pham Hang Thanh ; Singh Rajiv Ratna ; Shankland Ian Robert ; Tung Hsueh Sung, Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride.
Baker Ralph Thomas ; Petrov Viacheslav Alexandrovich ; Rao Velliyur Nott Mallikarjuna ; Sievert Allen Capron, Process for the manufacture of halocarbons and selected compounds and azeotropes with HF.
Baker, Ralph Thomas; Miller, Ralph Newton; Petrov, Viacheslav Alexandrovich; Rao, Velliyur Nott Mallikarjuna; Sievert, Allen Capron, Process for the manufacture of halocarbons and selected compounds and azeotropes with HF.
Baker, Ralph Thomas; Miller, Ralph Newton; Petrov, Viacheslav Alexandrovich; Rao, Velliyur Nott Mallikarjuna; Sievert, Allen Capron, Process for the manufacture of halocarbons and selected compounds and azeotropes with HF.
Homoto Yukio,JPX ; Shibanuma Takashi,JPX ; Nishitsuji Masanobu,JPX, Process of separating pentafluoroethane and process of producing pentafluoroethane using the same.
Furmanek Paul S. ; Glasscock David A. ; Keane ; Jr. Michael, Production of dihalomethanes containing fluorine and azeotropes of dihalomethanes containing chlorine with HF.
Furmanek Paul S. ; Glasscock David A. ; Keane ; Jr. Michael ; Mahler Barry A. ; Rao V. N. Mallikarjuna, Production of dihalomethanes containing fluorine and azeotropes of dihalomethanes containing chlorine with HF.
Merkel, Daniel C.; Pokrovski, Konstantin A.; Tung, Hsueh S.; Pham, Hang T.; Singh, Rajiv R., Separation of close boiling compounds by addition of a third compound.
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