US4028426A
Expired / Lapsed
US
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Removal of monochloroacetylene from chlorinated hydrocarbons
Assignee: PPG Industries Inc
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Filing: 1975-11-18
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Granted: 1977-06-07
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Expires: 1995-11-18
Abstract
Abstract Monochloroacetylene occurring as an impurity in 1,1-dichloroethylene is removed by chemical reaction in the presence of an aqueous HCl/cuprous chloride catalyst composition.
Inventors
- 👤 John Douglas Mansell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:48
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/395; C07C21/00; C07C21/02; C07C21/04; C07C21/073
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A method of reducing the monochloroacetylene content of liquid saturated or ethylenically unsaturated chlorohydrocarbons which comprises contacting said chlorohydrocarbons with a liquid catalyst composition comprising cuprous halide and aqueous haloid acid selected from HCl, HBr, HI at a temperature and pressure which mmaintains the catalyst in liquid form.
Claim 2
Independent Claim
48 words
A method of reducing the monochloroacetylene content of liquid saturated or ethylenically unsaturated chlorohydrocarbons which comprises contacting said chlorohydrocarbons with a liquid catalyst composition comprising cuprous halide and aqueous haloid acid selected from HCl, HBr, HI at a temperature and pressure which mmaintains the catalyst in liquid form.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein the catalyst composition comprises hydrochloric acid and cuprous chloride.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein the catalyst composition is contacted with the liquid saturated or ethylenically unsaturated chlorohydrocarbons for a time from one-tenth second to 10 hours.
Claim 5
Dependent Claim
48 words
A method according to claim 2 wherein the aqueous catalyst composition consists essentially of above 4 weight percent hydrogen chloride based on the weight of catalyst composition and solubilized cuprous chloride at a concentration of at least one weight percent of its maximum solubility in the catalyst composition.
Claim 6
Dependent Claim
31 words
A method according to claim 1 wherein the liquid saturated or ethylenically unsaturated chlorohydrocarbons are contacted with between 0.1 to 100 volume percent of catalyst composition based on the chlorohydrocarbons volume.
Claim 7
Dependent Claim
16 words
A method according to claim 4 wherein the catalyst composition has a density greater than 1,1-dichloroethylene.
Claim 8
Independent Claim
68 words
A method of reducing the monochloroacetylene content of liquid saturated or ethylenically unsaturated chlorohydrocarbons by distillation of the monochloroacethylene from said chlorohydrocarbons and subsequent chemical conversion of the monochloroacethylene; wherein the improvement comprises: contacting the distilled monochloroacetylene with a liquid catalyst composition comprising cuprous halide and aqueous haloid acid selected from HCl, HBr, and HI at a temperature and pressure which maintains the catalyst composition in liquid form.
Claim 9
Independent Claim
68 words
A method of reducing the monochloroacetylene content of liquid saturated or ethylenically unsaturated chlorohydrocarbons by distillation of the monochloroacethylene from said chlorohydrocarbons and subsequent chemical conversion of the monochloroacethylene; wherein the improvement comprises: contacting the distilled monochloroacetylene with a liquid catalyst composition comprising cuprous halide and aqueous haloid acid selected from HCl, HBr, and HI at a temperature and pressure which maintains the catalyst composition in liquid form.
Claim 10
Dependent Claim
29 words
A method according to claim 7 wherein the monochloroacetylene content of a liquid ethylenically unsaturated chlorohydrocarbon consisting of the 1,1-dichloroethylene product prepared by the dehydrochororination of 1,1,2-trichloroethane is reduced.
References Cited (Backward Citations)
US2809221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |