US4880765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing carbon molecular sieves
Assignee: Bergwerksverband GmbH
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Filing: 1987-05-22
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Granted: 1989-11-14
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Expires: 2007-05-22
Abstract
Abstract Process for producing carbon molecular sieves for separating oxygen and nitrogen by treating a carbonaceous product with inert gas and steam in a vibrating oven and further treating said product with benzene at a high temperature in a vibrating oven to thereby narrow the existing pores.
Inventors
- 👤 Karl Knoblauch
- 👤 Ferdinand Tarnow
- 👤 Heinrich Heimbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:59
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/28; B01J19/285; B01J20/00; B01J20/02; B01J20/20; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0259; C01B13/0262; C01B13/0266; C01B21/00; C01B21/04; C01B21/0405; C01B21/0433; C01B21/045; C01B21/0455; C01B21/0461; C01B32/00; C01B32/30; C01B32/306; C01B32/39; C01B2210/00; C01B2210/0043; C01B2210/0045; C01B2210/0046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
Process for producing carbon molecular sieves for the separation of oxygen and nitrogen, wherein a carbonization product with a content of up to 5% by volume of volatile components is treated with carbon-splitting hydrocarbons which react in the carbon structure of the carbonization product with narrowing the already existing pores, characterized in that the carbonization product is passed through a vibrating oven at 800° C. to 900° C. for 5 to 30 minutes, whereinto a stream of inert gas with a steam concentration of 20 to 95% by volume has been fed in counterflow to produce a slightly activated product and this slightly activated product is again passed through the vibrating oven, at 750° C. to 850° C., whereinto a stream of inert gas with a benzene vapor concentration of 5 to 12% by volume has been fed in counterflow to produce a carbon molecular sieve having narrower pores than said carbonization product.
Claim 2
Dependent Claim
153 words
Process for producing carbon molecular sieves for the separation of oxygen and nitrogen, wherein a carbonization product with a content of up to 5% by volume of volatile components is treated with carbon-splitting hydrocarbons which react in the carbon structure of the carbonization product with narrowing the already existing pores, characterized in that the carbonization product is passed through a vibrating oven at 800° C. to 900° C. for 5 to 30 minutes, whereinto a stream of inert gas with a steam concentration of 20 to 95% by volume has been fed in counterflow to produce a slightly activated product and this slightly activated product is again passed through the vibrating oven, at 750° C. to 850° C., whereinto a stream of inert gas with a benzene vapor concentration of 5 to 12% by volume has been fed in counterflow to produce a carbon molecular sieve having narrower pores than said carbonization product.
Claim 3
Dependent Claim
150 words
Process for producing carbon molecular sieves for the separation of oxygen and nitrogen, wherein a carbonization product with a content of volatile components up to 5% is treated with carbon-splitting hydrocarbons, which react in the carbon structure of the carbonization product with narrowing of already existing pores, characterized in that the carbonization product is passed through a vibrating oven at 800° C. to 900° C. for 5 to 30 minutes, whereinto a stream of inert gas with a steam concentration of 20 to 95% by volume has been fed in counterflow to produce a slightly activated product and this slightly activated product is passed through a second vibrating oven at 750° C. to 850° C., whereinto a stream of inert gas with a benzene vapor concentration of 5 to 12% by volume has been fed in counterflow to produce a carbon molecular sieve having narrower pores than said carbonization product.
Claim 4
Dependent Claim
150 words
Process for producing carbon molecular sieves for the separation of oxygen and nitrogen, wherein a carbonization product with a content of volatile components up to 5% is treated with carbon-splitting hydrocarbons, which react in the carbon structure of the carbonization product with narrowing of already existing pores, characterized in that the carbonization product is passed through a vibrating oven at 800° C. to 900° C. for 5 to 30 minutes, whereinto a stream of inert gas with a steam concentration of 20 to 95% by volume has been fed in counterflow to produce a slightly activated product and this slightly activated product is passed through a second vibrating oven at 750° C. to 850° C., whereinto a stream of inert gas with a benzene vapor concentration of 5 to 12% by volume has been fed in counterflow to produce a carbon molecular sieve having narrower pores than said carbonization product.
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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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |