Patent US730188A successfully refreshed from Google Patents.
Patent US1287900A successfully refreshed from Google Patents.
US4400568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing styrene, and an appropriate agent
Assignee: Individual
•
Filing: 1982-04-16
•
Granted: 1983-08-23
•
Expires: 2002-04-16
Abstract
Abstract The invention relates to a process for oxidatively dehydrogenating dehydrogenatable organic compounds to prepare styrene. In this process, the compounds mentioned are reacted in the vapor phase with oxygen at a temperature above 350° C. in the presence of a catalyst based on zirconium phosphate. Suitable dehydrogenatable organic compounds are above all saturated alkylaromatics, in particular ethylbenzene.
Inventors
- 👤 Hanns Hofmann
- 👤 Gerd Emig
- 👤 Wolfgang Ruppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:39
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; C; C07; C07C; C07C5/00; C07C5/42; C07C5/48
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
113 words
A process for oxidatively dehydrogenating ethylbenzene to prepare styrene, which process comprises reacting ethylbenzene in the vapor phase with oxygen at a temperature above 350° C. in the presence of a crystalline zirconium phosphate catalyst capable of ion exchange, said zirconium phosphate catalysts having been precipitated in a gel-like form from a zirconium salt solution by the addition of an excess of phosphate ions, impregnated with at least 1 liter of an at least 10 M orthosphophoric acid per 100 g of zirconium phosphate gel, filtered off from excess phosphoric acid, washed with water until the water draining off has a pH of 2 to 3 and dried at 120° to 250° C.
Claim 2
Dependent Claim
113 words
A process for oxidatively dehydrogenating ethylbenzene to prepare styrene, which process comprises reacting ethylbenzene in the vapor phase with oxygen at a temperature above 350° C. in the presence of a crystalline zirconium phosphate catalyst capable of ion exchange, said zirconium phosphate catalysts having been precipitated in a gel-like form from a zirconium salt solution by the addition of an excess of phosphate ions, impregnated with at least 1 liter of an at least 10 M orthosphophoric acid per 100 g of zirconium phosphate gel, filtered off from excess phosphoric acid, washed with water until the water draining off has a pH of 2 to 3 and dried at 120° to 250° C.
Claim 3
Dependent Claim
46 words
The process as claimed in claim 1, wherein a mixture of an oxygen-containing gas and ethylbenzene is passed over the catalyst at a temperature of 350° C.-550° C. and a residence time of 0.5 to 5 grams of gas mixture per gram of catalyst per hour.
Claim 4
Dependent Claim
21 words
The process as claimed in claim 2, wherein the ethylbenzene is diluted with an up to 10-fold amount of inert gas.
Claim 5
Dependent Claim
17 words
The process as claimed in claim 1, wherein the temperature is about 380° C. to 530° C.
Claim 6
Dependent Claim
18 words
The process as claimed in claim 1, wherein the molar ratio of oxygen ethylbenzene is 0.5:1 to 2:1.
Claim 7
Dependent Claim
41 words
The process as claimed in claim 1, wherein the catalyst is subjected to an impregnating period of 10 to 14 hours at about the boiling point and to 30-40 hours at room temperature and to a drying period of 24-48 hours.
Claim 8
Dependent Claim
19 words
The process as claimed in claim 1, wherein Cs ions are added before the impregnating step and drying step.
Claim 9
Dependent Claim
19 words
The process as claimed in claim 1, wherein the catalyst has a surface area of 10-50 m 2 /g.
Claim 10
Dependent Claim
47 words
The process as claimed in claim 1, wherein the regeneration of the catalyst, when necessary, is carried out by incompletely burning off the carbon-containing deposits at 400°-540° C. down to a residual content of 7-15% by weight by means of oxygen or gases which contain molecular oxygen.
Claim 11
Dependent Claim
34 words
The process as claimed in claim 1, wherein the catalyst further contains ions of an element from the group Ia, IIa, IVb, Vb, VIb, VIIb or VIII of the periodic system of the elements.
Claim 12
Dependent Claim
22 words
The process as claimed in claim 10, wherein the ions are contained in the catalyst in a concentration of 1-20% by weight.
Claim 13
Dependent Claim
26 words
The process as claimed in claim 10, wherein the ions are taken from the group of K, Cs, Mg, Ba, Cr, Mn, Fe or Ni ions.
Claim 14
Dependent Claim
23 words
The process as claimed in claim 10, wherein the ions are taken from the group of K, Cs, Ba, Fe, or Ni ions.
Claim 15
Dependent Claim
25 words
The process as claimed in claim 10, wherein the ions are taken from the group of K, Cs, Mg, Cr, Mn, Fe or Ni ions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |