Solid phosphoric acid catalyst
US4946815A · kind A · utility
10Cited by
9References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 23, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Dec 23, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A solid phosphoric acid catalyst having a total X-ray intensity of at least 30 percent relative to alpha-alumina. The solid phosphoric acid catalyst is produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material at a temperature of from 250.degree. to 450.degree. C. and in the presence of from 3 to 50 mole percent water vapor based upon the total vapor rate to the crystallizing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.