GB886714A - Production of fluorocarbons - Google Patents
Production of fluorocarbonsInfo
- Publication number
- GB886714A GB886714A GB27356/59A GB2735659A GB886714A GB 886714 A GB886714 A GB 886714A GB 27356/59 A GB27356/59 A GB 27356/59A GB 2735659 A GB2735659 A GB 2735659A GB 886714 A GB886714 A GB 886714A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pyrolysis
- chlorodifluoromethane
- hexafluoropropylene
- mixture
- fluorocarbons
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
- C07C17/386—Separation; Purification; Stabilisation; Use of additives by distillation with auxiliary compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/26—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton
- C07C17/263—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions
- C07C17/269—Preparation of halogenated hydrocarbons by reactions involving an increase in the number of carbon atoms in the skeleton by condensation reactions of only halogenated hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
<PICT:0886714/IV (b)/1> Hexafluoropropylene and perfluoro-cyclobutane are separated from a mixture of fluorocarbons obtained by the pyrolysis of chlorodifluoromethane at 400 DEG C. to 900 DEG C. followed by the removal of tetrafluoroethylene, hydrogen chloride and unreacted chlorodifluoro-methane from the mixture, by extractive distillation under liquid distillation conditions by aromatic or chlorinated aromatic hydrocarbons. The pyrolysis may be carried out from 0.05 to 5 seconds at a pressure between 0.1 to 2.0 atmospheres and the hydrocarbon may be alkyl or chlorosubstituted benzene such as xylene, toluene, chlorobenzene o- or p-chlorotoluene, or o-chloroethyl benzene preferably employed in from 1 to 25 times the amount of fluorocarbons produced in the pyrolysis. In an embodiment of the process, gases from the pyrolysis of chlorodifluoromethane in a multiple tube furnace (10), are cooled (11) and compressed (12) and tetrafluoroethylene and hydrogen chloride are distilled off (13), chlorodifluoromethane removed (15), and the compounds boiling higher than chlorohexafluoropropane removed (17), the mixture is then passed to an extractive distillation column (18) into which solvent is charged. The overhead fraction comprising pure hexafluoropropylene and perfluorocyclobutane is then separated in a further distillation column (19) and the solvent dried and recycled. Specified examples are given and the process may be employed for the preparation of hexafluoropropylene and perfluorocyclobutane. U.S.A. Specification 2,551,573 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US886714XA | 1958-08-14 | 1958-08-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB886714A true GB886714A (en) | 1962-01-10 |
Family
ID=22212731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27356/59A Expired GB886714A (en) | 1958-08-14 | 1959-08-11 | Production of fluorocarbons |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1108205B (en) |
FR (1) | FR1238480A (en) |
GB (1) | GB886714A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5049241A (en) * | 1990-03-27 | 1991-09-17 | E. I. Du Pont De Nemours And Company | Extractive distillation |
WO1999044973A1 (en) * | 1998-03-05 | 1999-09-10 | E.I. Du Pont De Nemours And Company | Processes for purifying perfluorocyclobutane |
-
1959
- 1959-08-11 GB GB27356/59A patent/GB886714A/en not_active Expired
- 1959-08-14 DE DEP23367A patent/DE1108205B/en active Pending
- 1959-08-14 FR FR802824A patent/FR1238480A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5049241A (en) * | 1990-03-27 | 1991-09-17 | E. I. Du Pont De Nemours And Company | Extractive distillation |
WO1999044973A1 (en) * | 1998-03-05 | 1999-09-10 | E.I. Du Pont De Nemours And Company | Processes for purifying perfluorocyclobutane |
Also Published As
Publication number | Publication date |
---|---|
DE1108205B (en) | 1961-06-08 |
FR1238480A (en) | 1960-08-12 |
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