Patent US4045545A successfully refreshed from Google Patents.
US4045545A
Expired / Lapsed
US
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Manufacture of complex hydrides
Assignee: Albemarle Corp
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Filing: 1975-01-29
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Granted: 1977-08-30
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Expires: 1995-01-29
Abstract
Abstract A process for the preparation of alkali metal aluminum hydrides including reacting aluminum and an alkali metal or alkali metal hydride with hydrogen at elevated temperatures and under super atmospheric pressure in the presence of an aliphatic or aromatic hydrocarbon.
Inventors
- 👤 Eugene C. Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:12
CPC Classifications
C; C01; C01B; C01B6/00; C01B6/24; C01B6/243
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
The process for the manufacture of alkali metal aluminum tetrahydrides in solid, readily filterable form comprising pressure hydrogenating at a temperature of about 50° C. to 250° C., a mixture consisting essentially of aluminum, the hydride of an alkali metal, and an organic liquid reaction medium stable at reaction conditions, said medium being selected from the class consisting of aliphatic hydrocarbons and aromatic hydrocarbons, said pressure hydrogenating being carried out in the presence of a catalyst selected from the group consisting of alkyl compounds of metals of Group I-A, II-A and III-A of the periodic table, said catalyst being in proportions of up to about 5 weight percent of the reaction medium thereby forming an alkali metal aluminum tetrahydride consisting of aluminum, the alkali metal and hydrogen in solid form and recovering said solid.
Claim 2
Dependent Claim
134 words
The process for the manufacture of alkali metal aluminum tetrahydrides in solid, readily filterable form comprising pressure hydrogenating at a temperature of about 50° C. to 250° C., a mixture consisting essentially of aluminum, the hydride of an alkali metal, and an organic liquid reaction medium stable at reaction conditions, said medium being selected from the class consisting of aliphatic hydrocarbons and aromatic hydrocarbons, said pressure hydrogenating being carried out in the presence of a catalyst selected from the group consisting of alkyl compounds of metals of Group I-A, II-A and III-A of the periodic table, said catalyst being in proportions of up to about 5 weight percent of the reaction medium thereby forming an alkali metal aluminum tetrahydride consisting of aluminum, the alkali metal and hydrogen in solid form and recovering said solid.
Claim 3
Dependent Claim
15 words
The process of claim 1 further defined in that the liquid reaction medium is toluene.
Claim 4
Dependent Claim
16 words
The process of claim 1 further defined in that the liquid reaction medium is 2,2,5-trimethyl hexane.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said alkali metal is sodium.
Claim 6
Dependent Claim
125 words
A process for the manufacture of alkali metal aluminum tetrahydrides in solid, readily filterable form comprising hydrogenating at a super atmospheric pressure of up to about 5000 pounds per square inch, and at an elevated temperature of up to about 250° C., a reaction system as defined hereafter, said reaction system consisting essentially of aluminum and an alkali metal hydride, and an organic liquid reaction medium stable at reaction conditions, said medium being selected from the class consisting of aliphatic and aromatic hydrocarbons, the hydrogenating being carried out in the presence of a catalyst consisting of an alkyl aluminum compound in proportions of up to about 5 percent based upon the liquid reaction medium thereby forming said tetrahydride in solid form and recovering said solid.
Claim 7
Dependent Claim
125 words
A process for the manufacture of alkali metal aluminum tetrahydrides in solid, readily filterable form comprising hydrogenating at a super atmospheric pressure of up to about 5000 pounds per square inch, and at an elevated temperature of up to about 250° C., a reaction system as defined hereafter, said reaction system consisting essentially of aluminum and an alkali metal hydride, and an organic liquid reaction medium stable at reaction conditions, said medium being selected from the class consisting of aliphatic and aromatic hydrocarbons, the hydrogenating being carried out in the presence of a catalyst consisting of an alkyl aluminum compound in proportions of up to about 5 percent based upon the liquid reaction medium thereby forming said tetrahydride in solid form and recovering said solid.
Claim 8
Dependent Claim
15 words
The process of claim 5 further defined in that the liquid reaction medium is toluene.
Claim 9
Dependent Claim
16 words
The process of claim 5 further defined in that the liquid reaction medium is 2,2,5-trimethyl hexane.
Claim 10
Dependent Claim
11 words
The process of claim 5 wherein said alkali metal is sodium.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |