US4132536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filtration process
Assignee: Rexnord Inc
•
Filing: 1976-09-07
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Granted: 1979-01-02
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Expires: 1996-09-07
Abstract
Abstract The present invention provides a method for preventing cross crystallization of particulate matter entrained in, and to be removed from, a dirty gas stream on a selected filter media where the method includes the addition of 0.01% to 1% by weight of an organic volatile liquid to the gas stream and the weight percent of organic volatile liquid is based on the weight of particulate matter carried by the gas stream.
Inventors
- 👤 John W. Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:36
CPC Classifications
B; B01; B01D; B01D51/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
In a process for calcining and grinding a friable substance where an off-gas stream carrying entrained particulate material including material subject to cross-crystallization is emitted from the grinding process, and the off-gas stream is introduced to a filter media separator means for physical separation of a portion of the particulate material, introducing from 0.01% to 1.0% of a volatile organic liquid into the gas stream prior to introduction of the gas stream into the filter media separator means where the weight of the volatile organic liquid added is based on the weight of particulate material entrained in the gas stream.
Claim 2
Dependent Claim
100 words
In a process for calcining and grinding a friable substance where an off-gas stream carrying entrained particulate material including material subject to cross-crystallization is emitted from the grinding process, and the off-gas stream is introduced to a filter media separator means for physical separation of a portion of the particulate material, introducing from 0.01% to 1.0% of a volatile organic liquid into the gas stream prior to introduction of the gas stream into the filter media separator means where the weight of the volatile organic liquid added is based on the weight of particulate material entrained in the gas stream.
Claim 3
Dependent Claim
16 words
The invention of claim 1 wherein the volatile organic liquid is introduced after the calcining operation.
Claim 4
Dependent Claim
16 words
The invention of claim 1 wherein the volatile organic liquid is introduced after the grinding process.
Claim 5
Dependent Claim
13 words
The invention of claim 1 where the volatile organic liquid includes diesel oil.
Claim 6
Dependent Claim
29 words
The invention of claim 1 where the volatile organic liquid includes ethylene glycol of molecular weight susceptible to volitalization at the pressure and temperature conditions prevailing in the process.
Claim 7
Dependent Claim
29 words
The invention of claim 1 where the volatile organic liquid includes propylene glycols of molecular weight susceptible to volatilization at the pressure and temperature conditions prevailing in the process.
References Cited (Backward Citations)
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US3068110A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |