Hydrodesulphurization of hydrocracked pitch
US4545879A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1984 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Jul 13, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S44/905
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An exceptionally effective technique has been developed for desulphurizing hydrocracked petroleum pitch containing organic molecules having at least some chemically bound sulphur. Particles of petroleum pitch and a para- or ferromagnetic material catalyst are intimately mixed and this mixture in the presence of hydrogen is subjected to microwave radiation so as to generate a high intensity oscillating electric field thereby releasing at least part of the chemically bound sulphur from the pitch as sulphur-containing gases without substantial increase of the temperature of the pitch and separating the sulphur containing gases thus formed. To avoid temperature rise during desulphurization, the microwave irradiation is preferably gated in a train of short pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.