Method for continuously controlling the water content of sulfuric acid alkylation catalyst
US4018846A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Dec 29, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2527/1206
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The water content of an alkylation catalyst comprising water and an acid selected from the group consisting of sulfuric acid and fluorosulfuric acid is determined continuously by contacting fuming sulfuric acid with said catalyst in a flow ratio sufficient to maintain the mixture thus formed at the point of incipient fuming. The presence of SO.sub.3 evolved therefrom is determined by use of an SO.sub.3 detector. The flow ratio at the point of incipient fuming is a direct measure of the amount of water in the alkylation catalyst stream. The water content thus measured is then compared to the desired water content and a signal corresponding to the deviation is used to vary the rate of fresh acid makeup to the alkylation reaction zone so as to maintain the desired water content of the catalyst in said reaction zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.