Patent US3720041A successfully refreshed from Google Patents.
US3720041A
Expired / Lapsed
US
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Process for drying methyl chloride in a polymer plant
Assignee: Individual
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Filing: 1971-12-08
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Granted: 1973-03-13
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Expires: 1991-12-08
Abstract
Abstract A process for drying methyl chloride in a butyl rubber process using glycol is improved by presaturating the glycol with liquid methyl chloride thereby avoiding temperature increases during presaturation. Need for a glycol-methyl chloride cooler is thereby eliminated. Since the absorber operates at a lower temperature, drying of the methyl chloride stream is more complete.
Inventors
- 👤 E Upchurch
- 👤 J Alvarez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:34
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
In a process for preparing butyl rubber, wherein the diluent stream is fried by contacting said diluent stream with a glycol in an absorption tower, the improvement which comprises: a. presaturating the glycol stream with liquid methyl chloride; b. storing the presaturated glycol in a presaturation vessel; and c. maintaining a constant pressure differential between the absorption tower and the presaturation vessel, said prEsaturation vessel being at about 1 to about 10 psi higher than said absorption tower.
Claim 2
Dependent Claim
78 words
In a process for preparing butyl rubber, wherein the diluent stream is fried by contacting said diluent stream with a glycol in an absorption tower, the improvement which comprises: a. presaturating the glycol stream with liquid methyl chloride; b. storing the presaturated glycol in a presaturation vessel; and c. maintaining a constant pressure differential between the absorption tower and the presaturation vessel, said prEsaturation vessel being at about 1 to about 10 psi higher than said absorption tower.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the absorption tower pressure is about 25 to about 75 psig.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the pressure differential between the absorption tower and presaturation vessel is about 2 to about 6 psi.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the pressure differential is about 5 psi.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the glycol is triethylene glycol, diethylene glycol or ethylene glycol.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the glycol is triethylene glycol.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the glycol stream comprises about 10 to about 30 wt. percent of an alkanolamine.
References Cited (Backward Citations)
US3005808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |