Hydrothermal pretreatment to prevent scale during liquefaction of certain solid carbonaceous materials
US4450066A · kind A · utility
7Cited by
8References
7Claims
0Family size
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Key dates
| Filing date | Nov 8, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Nov 8, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by hydrothermal pretreatment. The said pretreatment is believed to convert the scale-forming components to the corresponding carbonate prior to liquefaction. The said pretreatment is accomplished at a total pressure within the range from about 1000 to about 4400 psia. Temperature during said pretreatment will generally be within the range from about 500.degree. to about 700.degree. F.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.