Patent US985486A successfully refreshed from Google Patents.
Patent US4122684A successfully refreshed from Google Patents.
US4122684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the recovery of volatile liquids
Assignee: BP Chemicals Ltd
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Filing: 1976-06-28
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Granted: 1978-10-31
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Expires: 1996-06-28
Abstract
Abstract Condensing of low boiling material from a gas by contact with heat exchange surface cooled with a boiling intermediate refrigerant which is itself condensed by boiling cryogenic fluid passing from a source to a sink of cryogenic fluid.
Inventors
- 👤 Michael J. Clarkson
- 👤 Robert Duffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
F; F17; F17C; F17C9/00; F17C9/02; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2203/00; F17C2203/03; F17C2205/00; F17C2205/01; F17C2205/0153; F17C2205/018; F17C2221/00; F17C2221/01; F17C2221/016; F17C2221/03; F17C2221/031; F17C2221/032; F17C2221/033; F17C2221/035; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161; F17C2227/00; F17C2227/03; F17C2227/0337; F17C2227/0341; F17C2265/00; F17C2265/01; F17C2265/015
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
The process for the recovery of a low boiling material present as a vapour in a gas which comprises feeding a bulk cryogenic fluid from a source of liquid cryogenic fluid to a sink of gaseous cryogenic fluid across the first side of a first heat exchange surface through which heat is removed from liquid intermediate refrigerant condensing on the second side of the first heat exchange surface, then passing the condensed liquid intermediate refrigerant, without compressing said refrigerant, to the first side of the second heat exchange surface through which it removes heat into boiling liquid intermediate refrigerant from low boiling materials present as a vapour in a gas, which vapour is condensing as a liquid on the second side of the second heat exchange surface.
Claim 2
Dependent Claim
127 words
The process for the recovery of a low boiling material present as a vapour in a gas which comprises feeding a bulk cryogenic fluid from a source of liquid cryogenic fluid to a sink of gaseous cryogenic fluid across the first side of a first heat exchange surface through which heat is removed from liquid intermediate refrigerant condensing on the second side of the first heat exchange surface, then passing the condensed liquid intermediate refrigerant, without compressing said refrigerant, to the first side of the second heat exchange surface through which it removes heat into boiling liquid intermediate refrigerant from low boiling materials present as a vapour in a gas, which vapour is condensing as a liquid on the second side of the second heat exchange surface.
Claim 3
Dependent Claim
22 words
The process according to claim 1 wherein the intermediate refrigerant is selected from the group consisting of methane, propane, propylene and argon.
Claim 4
Dependent Claim
30 words
The process according to claim 1 wherein the low boiling material is vinyl chloride which is present in a stream of gas fed into contact with the second heat exchanger.
Claim 5
Dependent Claim
11 words
The process according to claim 3 wherein the gas is air.
Claim 6
Dependent Claim
12 words
The process according to claim 4 wherein the intermediate refrigerant is methane.
Claim 7
Dependent Claim
12 words
The process according to claim 5 wherein the gas stream is dry.
Claim 8
Dependent Claim
29 words
The process according to claim 1 wherein the total amount of freezable materials present in the gas stream is not more than 10% by weight of the vinyl chloride.
Claim 9
Dependent Claim
21 words
The process according to claim 1 wherein the pressure of the gas stream is in the range 0 to 80 psig.
Claim 10
Dependent Claim
18 words
The process according to claim 1 wherein the temperature of the gas stream is 20° to -60° C.
Claim 11
Dependent Claim
41 words
The process according to claim 1 wherein all the heat exchange required to transfer heat from the gas containing the low boiling substance by way of the intermediate refrigerant to the liquid cryogenic fluid takes place within a common insulated shell.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |