Patent JPS583280A successfully refreshed from Google Patents.
Patent US3002035A successfully refreshed from Google Patents.
US3002035A
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Process for preparing para-xylene
Assignee: Hoechst AG
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Filing: 1957-05-10
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Granted: 1961-09-26
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Hieronymus Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:11
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C07; C07C; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; C07C5/412; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE MANUFACTURE OF PARA-XYLENE, WHICH COMPRISES AROMATIZING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIISOBUTYLENE, TRIISOBUTYLENE, HYDROGENATION PRODUCTS THEREOF AND MIXTURES THEREOF, IN THE PRESENCE OF A SOLID, CHROMIUM OXIDE-CONTAINING AROMATIZATION CATALYST, AT A TEMPERATURE IN THE RANGE FROM 450* C. TO 650*C. AT A CHARGE PER VOLUME AND TIME OF 0.4 TO 0.9 LITER OF LIQUID HYDROCARBON PER LITER OF CONTACT SPACE AND HOUR IN THE PRESENCE OF 65% TO 80% BY VOLUME OF A DILUENT SELECTED FROM THE GROUP CONSISTING OF NITROGEN, METHANE AND MIXTURES THEREOF, THE PERCENTAGE FIGURE BEING CALCULATED UPON THE TOTAL VOLUME OF THE DILUENT AND THE VAPORIZED STARTING MATERIAL.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE MANUFACTURE OF PARA-XYLENE, WHICH COMPRISES AROMATIZING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIISOBUTYLENE, TRIISOBUTYLENE, HYDROGENATION PRODUCTS THEREOF AND MIXTURES THEREOF, IN THE PRESENCE OF A SOLID, CHROMIUM OXIDE-CONTAINING AROMATIZATION CATALYST, AT A TEMPERATURE IN THE RANGE FROM 450* C. TO 650*C. AT A CHARGE PER VOLUME AND TIME OF 0.4 TO 0.9 LITER OF LIQUID HYDROCARBON PER LITER OF CONTACT SPACE AND HOUR IN THE PRESENCE OF 65% TO 80% BY VOLUME OF A DILUENT SELECTED FROM THE GROUP CONSISTING OF NITROGEN, METHANE AND MIXTURES THEREOF, THE PERCENTAGE FIGURE BEING CALCULATED UPON THE TOTAL VOLUME OF THE DILUENT AND THE VAPORIZED STARTING MATERIAL.
References Cited (Backward Citations)
US2785209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |