US4005987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying moist materials, particularly crystalline solids containing water of hydration
Assignee: GEA Group AG
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Filing: 1974-09-30
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Granted: 1977-02-01
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Expires: 1994-09-30
Abstract
Abstract A process for drying moist material, particularly substances containing water of crystallization, in which the material is passed in counterflow through a shaft to gases having an inlet temperature of 200 DEG to 1000 DEG C. The gas rises at a velocity of 2 to 30 m/sec. and the moist substances are introduced into the shaft in a high-density stream so that the moist materials agglomerate concurrently with the drying.
Inventors
- 👤 Egon Jury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:08
CPC Classifications
C; C01; C01D; C01D7/00; C01D5/00; C01D5/18; C01G; C01G49/00; C01G49/14; C22; C22B; C22B1/00; C22B1/14; C22B1/16; C22B1/214; C22B1/26; F; F26; F26B; F26B17/00; F26B17/12; F26B17/14; F26B3/00; F26B3/02; F26B3/14; F26B3/16; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
A process for removing water of hydration from iron sulfate heptahydrate and agglomerating the resulting crystalline solid which comprises the steps of: A. passing a hot gas stream upwardly through a shaft at a velocity of 2 to 30 m/sec and an inlet temperature of substantially 500° to 1000° C, B. introducing particles of said crystalline solid into said shaft at an upper portion thereof, C. permitting said particles to descend in counterflow to said gas stream whereby said particles agglomerate while water of hydration is driven off, D. cooling the agglomerated material at a lower portion of said shaft below that at which said hot gas stream is introduced by treating the agglomerated material with cold air, E. recovering fine particles from said hot gas stream upon its emergence from said shaft, and F. adding the recovered fine particles to the solid introduced into said shaft.
Claim 2
Dependent Claim
147 words
A process for removing water of hydration from iron sulfate heptahydrate and agglomerating the resulting crystalline solid which comprises the steps of: A. passing a hot gas stream upwardly through a shaft at a velocity of 2 to 30 m/sec and an inlet temperature of substantially 500° to 1000° C, B. introducing particles of said crystalline solid into said shaft at an upper portion thereof, C. permitting said particles to descend in counterflow to said gas stream whereby said particles agglomerate while water of hydration is driven off, D. cooling the agglomerated material at a lower portion of said shaft below that at which said hot gas stream is introduced by treating the agglomerated material with cold air, E. recovering fine particles from said hot gas stream upon its emergence from said shaft, and F. adding the recovered fine particles to the solid introduced into said shaft.
Claim 3
Dependent Claim
14 words
The process defined in claim 1 wherein said velocity is 8 to 25 m/sec.
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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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |