US4680127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of scavenging hydrogen sulfide
Assignee: Veolia WTS USA Inc
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Filing: 1985-12-13
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Granted: 1987-07-14
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Expires: 2005-12-13
Abstract
Abstract The present invention is directed to methods of reducing the amount of hydrogen sulfide in hydrogen sulfide-containing aqueous or wet gaseous mediums without solids formation. This invention comprises adding an effective amount for the purpose of glyoxal or glyoxal in combination with formaldehyde or glutaraldehyde to the desired hydrogen sulfide-containing medium.
Inventors
- 👤 James G. Edmondson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; C; C02; C02F; C02F1/00; C02F1/20; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
46 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without solids formation, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal.
Claim 2
Independent Claim
46 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without solids formation, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal.
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein said glyoxal is added in an amount to provide a glyoxal:hydrogen sulfide molar ratio from about 1:1 to about 2.5:1.
Claim 4
Dependent Claim
24 words
A method according to claim 1, wherein said glyoxal is added in an amount to provide a glyoxal:hydrogen sulfide molar ratio of about 2.07:1.
Claim 5
Dependent Claim
16 words
A method according to claim 1, wherein said aqueous medium has a pH of about 9.
Claim 6
Dependent Claim
14 words
A method according to claim 1, wherein the addition is conducted at ambient temperature.
Claim 7
Independent Claim
81 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal and a formaldehyde in combination, wherein said glyoxal and said formaldehyde are each added in an amount to provide a glyoxal/formaldehyde:hydrogen sulfide molar ratio from about 0.3:1 to about 3:1.
Claim 8
Independent Claim
81 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal and a formaldehyde in combination, wherein said glyoxal and said formaldehyde are each added in an amount to provide a glyoxal/formaldehyde:hydrogen sulfide molar ratio from about 0.3:1 to about 3:1.
Claim 9
Dependent Claim
27 words
A method according to claim 6, wherein said glyoxal and said formaldehyde are added in an amount to provide a glyoxal/formaldehyde:hydrogen sulfide molar ratio of about 3:1.
Claim 10
Dependent Claim
16 words
A method according to claim 6, wherein said aqueous medium has a pH of about 9.
Claim 11
Dependent Claim
14 words
A method according to claim 6 wherein the addition is conducted at ambient temperature.
Claim 12
Independent Claim
81 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal and a glutaraldehyde in combination, wherein said glyoxal and said glutaraldehyde are each added in an amount to provide a glyoxal/glutaraldehyde:hydrogen sulfide molar ratio from about 0.3:1 to about 3:1.
Claim 13
Independent Claim
81 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises adding to the aqueous medium an effective amount for the purpose of a glyoxal and a glutaraldehyde in combination, wherein said glyoxal and said glutaraldehyde are each added in an amount to provide a glyoxal/glutaraldehyde:hydrogen sulfide molar ratio from about 0.3:1 to about 3:1.
Claim 14
Dependent Claim
16 words
A method according to claim 10, wherein said aqueous medium has a pH of about 9.
Claim 15
Dependent Claim
14 words
A method according to claim 10, wherein the addition is conducted at ambient temperature.
Claim 16
Independent Claim
54 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing wet gaseous aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises contacting said wet gaseous medium with an effective amount for the purpose of a glyoxal.
Claim 17
Independent Claim
54 words
A method for reducing the amount of hydrogen sulfide in a hydrogen sulfide-containing wet gaseous aqueous medium without the formation of a solid reaction product, wherein said aqueous medium has a pH from neutral to alkaline, which method comprises contacting said wet gaseous medium with an effective amount for the purpose of a glyoxal.
Claim 18
Dependent Claim
26 words
A method according to claim 13, wherein said glyoxal is added in amount to provide a glyoxal:hydrogen sulfide molar ratio from about 1:1 to about 2.5:1.
Claim 19
Dependent Claim
14 words
A method according to claim 13, wherein said contacting is conducted at ambient temperature.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |