US4985228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogen peroxide
Assignee: EIDP Inc
•
Filing: 1990-07-17
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Granted: 1991-01-15
•
Expires: 2010-07-17
Abstract
Abstract A method is disclosed for the purification of hydrogen peroxide by using activated carbon which has been chemically modified by using ammonium carbonate, (NH 4 ) 2 CO 3 , or by using ethylenediaminetetraacetic acid diammonium salt, (NH 4 ) 2 EDTA, followed by distillation.
Inventors
- 👤 Kirby Kirksey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:29
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/013
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A process for the purification of hydrogen peroxide which includes the removal of impurities, comprising the steps of: (a) pretreating activated carbon by at least one hot washing of the same with ammonium carbonate; (b) contacting a quantity of hydrogen peroxide to be purified with the resultant washed activated carbon thereby effecting the absorbing of impurities present in the hydrogen peroxide; and (c) separating the contacted hydrogen peroxide and distilling the same.
Claim 2
Dependent Claim
72 words
A process for the purification of hydrogen peroxide which includes the removal of impurities, comprising the steps of: (a) pretreating activated carbon by at least one hot washing of the same with ammonium carbonate; (b) contacting a quantity of hydrogen peroxide to be purified with the resultant washed activated carbon thereby effecting the absorbing of impurities present in the hydrogen peroxide; and (c) separating the contacted hydrogen peroxide and distilling the same.
Claim 3
Dependent Claim
31 words
The process as defined in claim 1, wherein: (a) the step of washing said activated carbon includes the slurring of the same in deionized water to make approximately a 10% slurry.
Claim 4
Dependent Claim
25 words
The process as defined in claim 1, wherein: (a) the step of pretreating said activated carbon includes a plurality of hot washes with ammonium carbonate.
Claim 5
Dependent Claim
32 words
The process as defined in claim 2, wherein: (a) the ammonium carbonate was added to said slurry to make about 0.5 to about 3.0 wt % treatment with respect to the carbon.
Claim 6
Dependent Claim
27 words
The process as defined in claim 2, including the step of: (a) stirring the slurry of ammonium carbonate and carbon at ambient temperature for approximately 30 minutes.
Claim 7
Dependent Claim
30 words
The process as defined in claim 5, including the step of: (a) filtering and drying the slurry at a temperature of about 115° C. for at least about five hours.
Claim 8
Dependent Claim
72 words
A process for the purification of hydrogen peroxide which includes the removal of impurities, comprising the steps of: (a) pretreating activated carbon by at least one hot washing of the same with ethylenediaminetetraacetic acid diammonium salt; (b) contacting a quantity of hydrogen peroxide to be purified with the resultant washed carbon thereby effecting the absorbing of impurities in the hydrogen peroxide; and (c) separating the contacted hydrogen peroxide and distilling the same.
Claim 9
Dependent Claim
72 words
A process for the purification of hydrogen peroxide which includes the removal of impurities, comprising the steps of: (a) pretreating activated carbon by at least one hot washing of the same with ethylenediaminetetraacetic acid diammonium salt; (b) contacting a quantity of hydrogen peroxide to be purified with the resultant washed carbon thereby effecting the absorbing of impurities in the hydrogen peroxide; and (c) separating the contacted hydrogen peroxide and distilling the same.
Claim 10
Dependent Claim
31 words
The process as defined in claim 7, wherein: (a) the step of washing said activated carbon includes the slurring of the same in deionized water to make approximately a 10% slurry.
Claim 11
Dependent Claim
27 words
The process as defined in claim 7, wherein: (a) the step of pretreating said activated carbon includes a plurality of hot washes with ethylenediaminetetraacetic acid diammonium salt.
Claim 12
Dependent Claim
33 words
The process as in claim 8, wherein: (a) the ethylenediaminetetraacetic acid diammonium salt was added to said slurry to make about 0.5 to about 3.0 wt % treatment with respect to the carbon.
Claim 13
Dependent Claim
26 words
The process as defined in claim 8, including the step of: (a) stirring the slurry of ethylenediaminetetraacetic acid diammonium salt and carbon for approximately 30 minutes.
Claim 14
Dependent Claim
30 words
The process as defined in claim 11, including the step of: (a) filtering and drying the slurry at a temperature of about 115° C. for at least about five hours.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |