Patent US3761534A successfully refreshed from Google Patents.
US3761534A
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Removal of acidic contaminants from process streams
Assignee: Dow Chemical Co
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Filing: 1971-12-29
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Granted: 1973-09-25
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Expires: 1991-12-29
Abstract
Abstract Acidic contaminants such as sulfuric acid, HCl, H2S, mercaptans and organic acids are efficiently removed from organic process streams by contacting the acid-containing streams with a porous granular alkali composed of 5-95 percent NaOH and 95-5 percent CaO or Ca(OH)2. The process is preferably carried out by introducing the organic stream at the bottom of a column of alkali with a sump or reservoir below the bottom.
Inventors
- 👤 Chung Sun Yun
- 👤 R Dickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:50
CPC Classifications
C; C10; C10G; C10G19/00; C10G19/073; C07; C07C; C07C29/00; C07C29/74; C07C29/88; C07C45/00; C07C45/78; C07C45/79; C07C7/00; C07C7/148; C07C7/14833; C07C7/1485; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921; Y10S585/924; Y10S585/926
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The method of claim 1 wherein the alkali is 15-85 parts of NaOH and 85-15 parts of Ca(OH)2, CaO or mixture thereof.
Claim 2
Dependent Claim
23 words
The method of claim 1 wherein the organic liquid is an alkylated aromatic compound containing a small amount of a strong mineral acid.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the acidic compound is H2S or a mercaptan.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein about 0.5-5 percent by volume of a water-miscible alcohol is added to the acid-containing organic liquid.
Claim 5
Dependent Claim
65 words
The method of claim 1 wherein the alkali forms a vertically disposed, substantially cylindrical bed of granular solid resting on a liquid-permeable support, a sump is defined below said support, the acid-contaminated organic liquid is introduced into the lower portion of said bed and passes upwardly therethrough, and solid salts formed upon contact of the acidic contaminants with the alkali are collected in said sump.
Claim 6
Dependent Claim
12 words
The process of claim 6 wherein the sump contains an aqueous liquid.
Claim 7
Dependent Claim
12 words
The process of claim 7 wherein the aqueous liquid is aqueous alkali.
References Cited (Backward Citations)
US1809554A
Cited
US1904381A
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US2227811A
Cited
US3000817A
Cited
US3164545A
Cited
US3496098A
Cited
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |