US5103031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Falling film aluminoxane process
Assignee: Albemarle Corp
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Filing: 1990-06-22
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Granted: 1992-04-07
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Expires: 2010-06-22
Abstract
Abstract Alkylaluminoxanes are made by conducting a solution of an alkylaluminum (e.g. trimethyl aluminum) in an inert solvent to the top of an upright hollow column and allowing the solution to flow as a thin film down the inner surface of the column while passing a wet inert gas (e.g. nitrogen) through the column such that the wet inert gas contacts the thin falling film of alkyl aluminum solution forming alkylaluminoxane.
Inventors
- 👤 Gerald Z. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:36
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
A process for making an alkylaluminoxane, said process comprising: (A) forming a solution of alkyl aluminum compound in an inert solvent, (B) conducting said alkyl aluminum solution to the upper end of a vertical or inclined hollow column, (C) causing said alkyl aluminum solution to flow in a thin film down the inner surface of said vertical or inclined column, (D) contacting an inert gas with water to form a wet inert gas, (E) conducting said wet inert gas stream inside said vertical or inclined column such that said wet inert gas passes through said vertical or inclined column and contacts said alkyl aluminum solution flowing down the inner surface of said vertical or inclined column and (F) collecting the effluent liquid at the bottom of said vertical or inclined column.
Claim 2
Dependent Claim
131 words
A process for making an alkylaluminoxane, said process comprising: (A) forming a solution of alkyl aluminum compound in an inert solvent, (B) conducting said alkyl aluminum solution to the upper end of a vertical or inclined hollow column, (C) causing said alkyl aluminum solution to flow in a thin film down the inner surface of said vertical or inclined column, (D) contacting an inert gas with water to form a wet inert gas, (E) conducting said wet inert gas stream inside said vertical or inclined column such that said wet inert gas passes through said vertical or inclined column and contacts said alkyl aluminum solution flowing down the inner surface of said vertical or inclined column and (F) collecting the effluent liquid at the bottom of said vertical or inclined column.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein said wet inert gas passes downwardly through said vertical or inclined column co-currently with said alkyl aluminum solution.
Claim 4
Dependent Claim
16 words
A process of claim 1 wherein said alkyl aluminum compound is a tri-C 1-8 alkyl aluminum.
Claim 5
Dependent Claim
13 words
A process of claim 3 wherein said alkyl aluminum compound is triisobutyl aluminum.
Claim 6
Dependent Claim
13 words
A process of claim 3 wherein said alkyl aluminum compound is trimethyl aluminum.
Claim 7
Dependent Claim
13 words
A process of claim 3 wherein said inert solvent is an aromatic hydrocarbon.
Claim 8
Dependent Claim
13 words
A process of claim 6 wherein said alkyl aluminum compound is triisobutyl aluminum.
Claim 9
Dependent Claim
13 words
A process of claim 6 wherein said alkyl aluminum compound is trimethyl aluminum.
Claim 10
Dependent Claim
11 words
A process of claim 6 wherein said aromatic hydrocarbon is toluene.
Claim 11
Dependent Claim
13 words
A process of claim 9 wherein said alkyl aluminum compound is triisobutyl aluminum.
Claim 12
Dependent Claim
13 words
A process of claim 9 wherein said alkyl aluminum compound is trimethyl aluminum.
Claim 13
Dependent Claim
10 words
A process of claim 1 wherein inert gas is nitrogen.
Claim 14
Dependent Claim
24 words
A process of claim 12 wherein said nitrogen is bubbled through water maintained at 20-60° C. to form a substantially water saturated nitrogen stream.
Claim 15
Dependent Claim
35 words
A process of claim 13 wherein said saturated nitrogen stream is heated to a temperature above the temperature of said water while being conducted to said vertical or inclined columns to prevent condensation of water.
Claim 16
Dependent Claim
41 words
A process of claim 1 wherein said effluent liquid is collected in a vessel and about 10-90 percent of said effluent liquid is recirculated to said upper end of said vertical or inclined column and mixes with said alkyl aluminum solution.
Claim 17
Dependent Claim
36 words
A process of claim 15 wherein a portion of said effluent liquid is withdrawn from said vessel and not recirculated, said withdrawal being at a rate which maintains a substantially constant liquid level in said vessel.
Claim 18
Dependent Claim
25 words
A process of claim 15 wherein said inert solvent is an aromatic hydrocarbon and said solution is about 5-20 weight percent tri-C 1-8 alkyl aluminum.
Claim 19
Dependent Claim
17 words
A process of claim 17 wherein said aromatic hydrocarbon is toluene and said inert gas is nitrogen.
Claim 20
Dependent Claim
12 words
A process of claim 18 wherein said alkyl aluminum is triisobutyl aluminum.
Claim 21
Dependent Claim
12 words
A process of claim 18 wherein said alkyl aluminum is trimethyl aluminum.
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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) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |