Process for utilization of the reaction heat generated by the catalytic oxidation of o-xylene
US4169098A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1977 |
| Grant date | Sep 25, 1979 |
| Priority date | — |
| Expiry date | Jan 21, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A process for utilization of the reaction heat generated by the catalytic oxidation of o-xylene with air to phthalic anhydride in a tubular reactor, which heat is partially carried away from the reactor by the reaction gas and partially by fused salt used as a cooling medium. Water is heated by heat exchange with the hot reaction gas, evaporated by heat exchange with the fused salt and the steam is superheated and expanded in a condensation turbine coupled with the feed air compressor. The hot reaction gas is used successively to heat, or evaporate, a heat carrier liquid serving for the heating of the phthalic anhydride distillation, and the pressurized water. Low pressure steam can be generated by heat exchange of pressurized water with the reaction gas and used for heating the feed air and/or o-xylene. Preferably, the evaporation and superheating of the heated pressure water is effected in two fused salt cooling stages; the compressed air is successively heated by heat exchange with low pressure steam generated by cooling of the reaction gas and with the high pressure steam generated by cooling of the fused salt; and, the heating liquid and the pressurized water are heated in a t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.