US5057642A
Expired / Lapsed
US
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Removal of basic impurities from olefin streams
Assignee: Phillips Petroleum Co
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Filing: 1991-04-18
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Granted: 1991-10-15
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Expires: 2011-04-18
Abstract
Abstract Basic impurities, in particular ammonia, are removed from monoolefin-containing feeds, in particular an isobutylene-containing feed, by contacting with a hydrated acidic clay.
Inventors
- 👤 Marvin M. Johnson
- 👤 Gerhard P. Nowack
- 👤 Mary E. Rezac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:35
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
A process for at least partially removing at least one basic impurity selected from the group consisting of ammonia, alkyl amines, cycloalkyl amines and aryl amines from a feed which comprises at least one monoolefin, comprising the step of contacting said feed with a hydrated acidic clay, under such contacting conditions as to obtain a product in which the concentration of said at least one basic impurity is lower than in said feed and the concentration of said at least one monoolefin is essentially the same as in said feed.
Claim 2
Dependent Claim
90 words
A process for at least partially removing at least one basic impurity selected from the group consisting of ammonia, alkyl amines, cycloalkyl amines and aryl amines from a feed which comprises at least one monoolefin, comprising the step of contacting said feed with a hydrated acidic clay, under such contacting conditions as to obtain a product in which the concentration of said at least one basic impurity is lower than in said feed and the concentration of said at least one monoolefin is essentially the same as in said feed.
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1, wherein said hydrated acidic clay contains about 0.05 to about 0.4 lb. of water per lb. of dry clay.
Claim 4
Dependent Claim
25 words
A process in accordance with claim 1, wherein said hydrated clay contains about 0.13 to about 0.20 lb. of water per lb. of dry clay.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 1, wherein said hydrated acidic clay is a hydrated acid-treated smectite clay.
Claim 6
Dependent Claim
46 words
A process in accordance with claim 4, wherein said hydrated acid-treated clay has an acidity of about 5-400 mg KOH per gram clay at phenolphthalein end point, a particle size of about 10-20 mesh, and a BET/N 2 surface area of about 200-500 m 2 /g.
Claim 7
Dependent Claim
19 words
A process in accordance with claim 1, wherein said at least one basic impurity in said feed is ammonia.
Claim 8
Dependent Claim
26 words
A process in accordance with claim 6, wherein the concentration of ammonia in said feed is about 1 ppm to about 500 ppm NH 3 .
Claim 9
Dependent Claim
24 words
A process in accordance with claim 1, wherein said feed contains about 50 to about 99.9 volume percent of said at least one monoolefin.
Claim 10
Dependent Claim
19 words
A process in accordance with claim 1, wherein said at least one monoolefin contains 2-5 carbon atoms per molecule.
Claim 11
Dependent Claim
31 words
A process in accordance with claim 1, wherein said at least one monoolefin contains 4 carbon atoms per molecule and said at least one basic impurity in said feed is ammonia.
Claim 12
Dependent Claim
34 words
A process in accordance with claim 10, wherein said at least one monoolefin is isobutylene and the concentration of ammonia in said feed is about 1 ppm to about 500 ppm NH 3 .
Claim 13
Dependent Claim
25 words
A process in accordance with claim 1, wherein said contacting conditions comprise a temperature of about 50°-250° F. and a pressure of about 0-500 psig.
Claim 14
Dependent Claim
25 words
A process in accordance with claim 12, wherein said contacting conditions comprise a temperature of about 70°-150° F. and a pressure of about 100-300 psig.
Claim 15
Dependent Claim
16 words
A process in accordance with claim 12, wherein said feed is liquid at said contacting conditions.
Claim 16
Dependent Claim
29 words
A process in accordance with claim 14, wherein said contacting conditions comprise a liquid hourly space velocity of about 0.5-10 volume feed per volume hydrated acidic clay per hour.
Claim 17
Dependent Claim
16 words
A process in accordance with claim 12, wherein said feed is gaseous at said contacting conditions.
Claim 18
Dependent Claim
29 words
A process in accordance with claim 16, wherein said contacting conditions comprise a gas hourly space velocity of about 100-2,000 volume feed per volume hydrated acidic clay per hour.
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) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |