Patent US3798877A successfully refreshed from Google Patents.
US3798877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel odor control method
Assignee: Stauffer Chemical Co
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Filing: 1972-12-21
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Granted: 1974-03-26
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Expires: 1992-12-21
Abstract
Abstract The invention is an odor control system for use in processes for manufacturing and preparing pesticidal and herbicidal compositions, said process involves the passage of the effluent stream or exhaust gases associated with the manufacturing and handling of the compositions through a zone into which finely divided activated carbon is introduced so as to make contact with the exhaust gases and to become entrained therein prior to the venting of the gases into the atmosphere. This system is particularly useful for controlling the odors which accompany the manufacture and preparation of synthetic organic pesticide and herbicide compositions containing sulfur and particularly phosphorothioate, phosphorodithioate and thiolcarbamate compositions.
Inventors
- 👤 N Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
40 words
The method of claim 1, wherein the activated carbon is fed into said carbon contacting zone at a feed rate which is from about two to 20 times the rate necessary to adsorb the odorous compositions from the gas stream.
Claim 2
Dependent Claim
62 words
The method of claim 1, wherein said pesticide and herbicide compositions are selected from the group consisting of: O,O-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate; Ethyl-N,N-di-n-propylthio carbamate; S-ethyl diisobutylthiocarbamate; O-ethyl-S-phenylethylphosphonodithioate; O,O-dimethyl S-phthalimidomethyl phosphorodithioate; S-(((p-chlorophenyl thio)methyl) O,O-diethyl phosphorodithioate; S-(((p-chlorophenyl)thio) methyl) O,O-dimethyl phosphorodithioate; S-(O,O-diisopropyl phosphorodithioate) of N-(2-mercaptoethyl) benzenesulfonamide; S-ethyl cyclohexyl ethyl thiocarbamate; S-propyl butyl ethylthiocarbamate; S-propyl dipropylthiocarbamate; Tetra-n-propyl dithiopyrophosphate; S-ethyl dipropylthiocarbamate; O,O-diethyl S-(ethylthio) methyl phosphorodithioate; and, S-ethyl hexahydro-H-azepine-1-carbothioate.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the herbicide and pesticide composition is selected from the group consisting of phosphorothioate, phosphorodithioate, phosphonothioate, phosphonodithioate, and thiolcarbamate.
Claim 4
Dependent Claim
38 words
The method of claim 1, wherein the gas stream passes through a particulate removal zone prior to passing through said carbon contacting zone; said particulate removal zone containing suitable means for removing particulate matter from said gas stream.
Claim 5
Dependent Claim
16 words
The method of claim 5, wherein said particulate removal zone comprises at least one fabric filter.
Claim 6
Dependent Claim
23 words
The method of claim 6, wherein said fabric filter is coated with a layer of adsorbant material on at least one surface thereof.
Claim 7
Dependent Claim
46 words
The method of claim 5, wherein the gas stream passes through a carbon separation zone subsequent to passing through said carbon contacting zone and prior to being vented into the atmosphere; said carbon separation zone containing suitable means for separating activated carbon from the gas stream.
Claim 8
Dependent Claim
19 words
The method of claim 8 wherein said carbon separation zone comprises at least one fixed bed of actIvated carbon.
Claim 9
Dependent Claim
57 words
The method of claim 1, wherein the gas stream passes through a carbon separation zone subsequent to passing through said carbon contacting zone and prior to being vented into the atmosphere; said carbon separation zone containing suitable means for removing said particles of finely divided activated carbon as well as other particulate materials from said gas stream.
Claim 10
Dependent Claim
16 words
The method of claim 10, wherein said carbon separation zone comprises at least one fabric filter.
Claim 11
Dependent Claim
39 words
The method of claim 10, wherein the activated carbon removed from the gas stream in said carbon separation zone is recycled back into the gas stream at a point subsequent to its contact with the herbicide and pesticide compositions.
Claim 12
Dependent Claim
80 words
The method of claim 1, wherein the gas stream which has contacted the herbicide and pesticide compositions passes through a particulate removal zone prior to passing through said activated carbon contacting zone and thereafter also passes through an activated carbon separation zone subsequent to passing through said carbon contacting zone and prior to being vented into the atmosphere; said particulate removal zone and said activated carbon separation zone both containing suitable means for removing particulate material from said gas stream.
Claim 13
Dependent Claim
22 words
The method of claim 13, wherein said particulate removal zone and said carbon contacting zone each comprise at least one fabric filter.
Claim 14
Dependent Claim
28 words
The method of claim 14, wherein said fabric filter in said particulate removal zone is precoated with a layer of particulate material on at least one surface thereof.
Claim 15
Dependent Claim
29 words
The method of claim 15, wherein said fabric filter in said activated carbon removal zone is precoated with a layer of activated carbon on at least one surface thereof.
Claim 16
Independent Claim
147 words
A method of controlling the odor of the gas stream which is discharged int0 the atmosphere during the manufacture and formulation of herbicides and insecticides composition selected from the group consisting of: O,O-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate; Ethyl-N,N-di-n-propylthio carbamate; S-ethyl diisobutylthiocarbamate; O-ethyl-S-phenylethylphosphonodithioate; O,O-dimethyl S-phthalimidomethyl phosphorodithioate; S-(((p-chlorophenyl)thio) methyl) O,O-diethyl phosphorodithioate; S-(((p-chlorophenyl)thio) methyl) O,O-dimethyl phosphorodithioate; S-(O,O-diisopropyl phosphorodithioate) of N-(2-mercaptoethyl) benzenesulfonamide; S-ethyl cyclohexyl ethyl thiocarbamate; S-propyl butyl ethylthiocarbamate; S-propyl dipropylthiocarbamate; Tetra-n-propyl dithiopyrophosphate; S-ethyl dipropylthiocarbamate; O,O-diethyl S-(ethylthio) methyl phosphorodithioate; and, S-ethyl hexahydro-H-azepine-1-carbothioate; said method comprising passing the gas stream for the apparatus used in preparing said herbicide and insecticide compositions through an activated carbon contacting zone into which particles of finely divided activated carbon are fed so as to make contact with and are entrained in said gas stream, said particles thereby adsorbing odor forming components from said effluent stream while they are entrained therein; said effluent thereafter being vented into the atmosphere.
Claim 17
Dependent Claim
41 words
The method of claim 17, wherein the activated carbon is fed into said activated carbon contacting zone at a feed rate which is from about two to 20 times the rate necessary to adsorb the odorous components from the gas stream.
Claim 18
Dependent Claim
38 words
The method of claim 17, wherein the gas stream passes through a particulate removal zone prior to passing through said carbon contacting zone; said particulate removal zone containing suitable means for removing particulate matter from said gas stream.
Claim 19
Dependent Claim
16 words
The method of claim 19, wherein said particulate removal zone comprises at least one fabric filter.
Claim 20
Dependent Claim
23 words
The method of claim 20, wherein said fabric filter is precoated with a layer of activated carbon on at least one surface thereof.
Claim 21
Dependent Claim
59 words
The method of claim 17, wherein the gas stream passes through said activated carbon separation zone subsequent to passing through said activated carbon contacting zone and prior to being vented into the atmosphere; said activated carbon separation zone containing suitable means for removing said particles of finely divided activated carbon as well as other particulate materials from said effluent.
Claim 22
Dependent Claim
16 words
The method of claim 22, wherein said carbon separation zone comprises at least one fabric filter.
Claim 23
Dependent Claim
51 words
The method of claim 22, wherein the activated carbon removed from the gas stream in said activated carbon separation zone is recycled back into the gas stream at a point subsequent to its contact with the pesticide and herbicide compositions, but prior to its entry into said activated carbon contacting zone.
Claim 24
Dependent Claim
72 words
The method of claim 16, wherein the gas stream passes through a particulate removal zone prior to passing through said activated carbon contacing zone and thereafter also passes through an activated carbon separation zone subsequent to passing through said activated carbon contacting zone and prior to being vented into the atomopshere; said particulate removal zone and said activated carbon separation zone both containing suitable means for removing particulate material from said effluent.
Claim 25
Dependent Claim
23 words
The method of claim 25, wherein said particulate removal zone and said activated carbon contacting zone each comprise at least one fabric filter.
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |