CA1081918A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Inert removal from chlorinated hydrocarbon production system
Assignee: Lummus Technology LLC
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Filing: 1976-01-16
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Granted: 1980-07-22
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Expires: 1996-01-16
Abstract
Abstract A B S T R A C T In the production of chlorinated hydrocarbons, a gas stream containing unreacted hydrocarbon, chlorinated hydro-carbon, carbon dioxide and inerts, such as, carbon monoxide and/or nitrogen, is contacted with a chlorinated hydrocarbon absorption oil to separate hydrocarbon, chlorinated hydro-carbon and carbon dioxide from inerts, The rich absorption solution is introduced into a stripper wherein chlorinated hydrocarbons are recovered as a sidestream, absorption solution as a bottoms and a hydrocarbon-carbon dioxide stream, containing a reduced amount of chlorinated hydrocarbons, as overhead. The overhead is introduced into a further absorption column, primarily designed to recover chlorinated hydrocarbons in the absorption solution, with a hydrocarbon overhead being withdrawn therefrom which is rich in carbon dioxide and is essentially free of low boiling chlorinated hydrocarbon, to thereby faeilitate subsequent separation of carbon dioxide. The process is particularly applicable to the production of chlorinated methanes or vinyl chloride. -i-
Inventors
- 👤 Chiung-Yuan Huang
- 👤 Stephen J. Sopko
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-03 19:30
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C7/00; C07C7/11; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
A process for separating low boiling chlorinated hydrocarbon from a gas stream containing hydrocarbon, at least one low boiling chlorinated hydrocarbon, carbon dioxide and inerts, comprising: introducing said gas stream into a first absorption zone wherein said gas stream is contacted with a chlorinated hydro-carbon absorption oil to absorb the hydrocarbon, carbon dioxide and the at least one bolling chlorinated hydrocarbon; withdrawing a rich absorption solution from the first absorption zone and introducing the rich absorption solution into a stripping zone to recover a first stream containing lean absoPption solution, a second stream containing the hydrocarbon, carbon dioxide and a minor portion of the at least one boiling chlorinated hydrocarbon and a third stream containing the at least one low boiling chlorinated hydrocarbon; introducing the second stream into a second absorption zone wherein the second stream is contacted with a chlorinated hydro-carbon absorption oil to selectively absorb the at least one low boiling chlorinated hydrocarbon from the second stream; and recovering from the second absorption zone the hydrocarbon and carbon dioxide essentially free of the at least one low boiling chlorinated hydrocarbon.
Claim 2
Dependent Claim
182 words
A process for separating low boiling chlorinated hydrocarbon from a gas stream containing hydrocarbon, at least one low boiling chlorinated hydrocarbon, carbon dioxide and inerts, comprising: introducing said gas stream into a first absorption zone wherein said gas stream is contacted with a chlorinated hydro-carbon absorption oil to absorb the hydrocarbon, carbon dioxide and the at least one bolling chlorinated hydrocarbon; withdrawing a rich absorption solution from the first absorption zone and introducing the rich absorption solution into a stripping zone to recover a first stream containing lean absoPption solution, a second stream containing the hydrocarbon, carbon dioxide and a minor portion of the at least one boiling chlorinated hydrocarbon and a third stream containing the at least one low boiling chlorinated hydrocarbon; introducing the second stream into a second absorption zone wherein the second stream is contacted with a chlorinated hydro-carbon absorption oil to selectively absorb the at least one low boiling chlorinated hydrocarbon from the second stream; and recovering from the second absorption zone the hydrocarbon and carbon dioxide essentially free of the at least one low boiling chlorinated hydrocarbon.
Claim 3
Dependent Claim
23 words
A process according to Claim 1 wherein rich absorption solution is recovered from the second absorption zone and introduced into the stripping zone.
Claim 4
Dependent Claim
45 words
A process according to Claim 2 wherein the chlorinated hydrocarbon absorption oil employed in the first and second absorption zones has a number of carbon atoms corresponding to the number of carbon atoms of the unreacted hydrocarbon and a boiling point of at least 140°F.
Claim 5
Dependent Claim
19 words
A process according to Claim 3 wherein the third stream is recovered as a sidestream from said stripping zone.
Claim 6
Dependent Claim
61 words
A process according to any one of Claims 2, 3 or 4 wherein the third stream includes a portion of the chlorinated hydrocarbon absorption oil and further comprising introducing the third stream into a further stripping zone to recover chlori-nated hydrocarbon absorption oil and recycling recovered chlori-nated hydrocarbon absorption oil to at least one of the first and second absorption zones.
Claim 7
Dependent Claim
35 words
A process according to any one of Claims 2, 3 or 4 wherein the first stream recovered from the stripping zone, containing chlorinated hydrocarbon absorption oil is recycled to the first and second absorption zones.
Claim 8
Dependent Claim
25 words
A process according to any one of Claims 2, 3 or 4 wherein the contacting in the first and second absorption zone is effected countercurrently.
Claim 9
Dependent Claim
48 words
A process according to any one of Claims 2, 3 or 4 wherein the hydrocarbon and carbon dioxide are introduced into a carbon dioxide absorption zone to absorb carbon dioxide there-from and hydrocarbon recovered from the carbon dioxide absorption zone is recycled to the chlorinated hydrocarbon production zone.
Claim 10
Dependent Claim
35 words
A process according to Claim 3 wherein the chlorinated hydrocarbons are chloromethanes, said hydrocarbon is methane and the chlorinated hydrocarbon absorption oil is selected from the group consisting of chloroform, carbon tetrachloride and mixtures thereof.
Claim 11
Dependent Claim
15 words
A process according to Claim 9 wherein the chlorinated hydrocarbon absorption oil is carbon tetrachloride,
Claim 12
Dependent Claim
49 words
A process according to Claim 10 wherein the gas stream introduced into the first absorption zone contains methyl chloride, methylene chloride and chloroform, said methyl chloride, methy-lene chloride and chloroform being recovered with carbon tetra-chloride absorption oil as said third stream withdrawn from the stripping zone as a sidestream.
Claim 13
Dependent Claim
38 words
A process according to any one of Claims 3, 9 or 10 wherein the first and second absorption zones are operated at a temperature of from 0°F to 170°F and a pressure of from 100 to 300 psig.
Claim 14
Dependent Claim
31 words
A process according to any one of Claims 2, 3 or 4 wherein the chlorinated hydrocarbons produced are C2 chlorinated hydrocarbons and the hydrocarbon is ethane, ethylene or a mixture thereof.
References Cited (Backward Citations)
No citation records indexed.
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