Patent US4571445A successfully refreshed from Google Patents.
US4571445A
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Process for removal of sulfur compounds from conjugated diolefins
Assignee: Shell USA Inc
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Filing: 1984-12-24
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Granted: 1986-02-18
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Expires: 2004-12-24
Abstract
Abstract A process is disclosed for reducing the level of sulfur compounds from liquid conjugated diolefin hydrocarbons by contacting said sulfur compound-bearing hydrocarbon liquids with sorbents prepared by combining particulate alumina with at least one compound decomposable to of sodium oxide, barium oxide, calcium oxide or a salt decomposable to potassium oxide, but excluding potassium carbonate and potassium bicarbonate and calcining. The process is particularly useful for removal of hydrogen sulfide and carbon disulfide from butadiene and isoprene.
Inventors
- 👤 Lynn H. Slaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:18
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/041; B01J20/06; B01J20/08; B01J20/30; B01J20/3078; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A process for reducing the level of sulfur compounds selected from hydrogen sulfide and carbon disulfide in a sulfur compound-containing liquid conjugated diolefin hydrocarbon having an atmospheric boiling point in the range from about -5° to about 45° C. which comprises contacting said liquid diolefin at a temperature up to about the boiling point of said liquid diolefin with a sorbent prepared by combining a porous particulate alumina having a surface area of about 100 to 365, M 2 per gram with a compound decomposable to sodium oxide, barium oxide, calcium oxide or a compound decomposable to potassium oxide, but excluding the carbonate or bicarbonate of potassium; and calcining the resultant alumina product at a temperature from about 350° to about 600° C.
Claim 2
Dependent Claim
123 words
A process for reducing the level of sulfur compounds selected from hydrogen sulfide and carbon disulfide in a sulfur compound-containing liquid conjugated diolefin hydrocarbon having an atmospheric boiling point in the range from about -5° to about 45° C. which comprises contacting said liquid diolefin at a temperature up to about the boiling point of said liquid diolefin with a sorbent prepared by combining a porous particulate alumina having a surface area of about 100 to 365, M 2 per gram with a compound decomposable to sodium oxide, barium oxide, calcium oxide or a compound decomposable to potassium oxide, but excluding the carbonate or bicarbonate of potassium; and calcining the resultant alumina product at a temperature from about 350° to about 600° C.
Claim 3
Dependent Claim
26 words
The process of claim 1, where in the sorbent the molar ratio of sodium or potassium metal to alumina ranges from about 1:1 to about 1:50.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein the sorbent is prepared by impregnating with sodium carbonate, sodium bicarbonate or potassium hydroxide.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein the sorbent is prepared by impregnating alumina with a sodium or potassium salt.
Claim 6
Dependent Claim
26 words
The process of claim 1, where in preparation of the sorbent, the combined alumina is calcined at a temperature from about 350° to about 500° C.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein said liquid conjugated diolefin is selected from butadiene, isoprene and the piperylenes.
Claim 8
Dependent Claim
11 words
The process of claim 6, wherein said liquid olefin is isoprene.
Claim 9
Dependent Claim
26 words
The process of claim 1, where in the sorbent, the molar ratio of barium or calcium metal to alumina ranges from about 1:1 to about 1:100.
Claim 10
Dependent Claim
21 words
The process of claim 1, where in the sorbent is prepared by impregnating the alumina with a barium or calcium salt.
Claim 11
Dependent Claim
12 words
The process of claim 9, wherein the conjugated diolefin liquid is isoprene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |