Hydrothermal pretreatment to prevent scale during liquefaction of certain solid carbonaceous materials

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:865016

Stone, John B ^[1]; Floyd, Frank M ^[2]

---

1. Houston, TX
2. Baytown, TX

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.

• Research Organization: Exxon Research and Engineering Co. (Florham Park, NJ)
• DOE Contract Number: FC01-77ET10069
• Assignee: Exxon Research and Engineering Co. (Florham Park, NJ)
• Patent Number(s): US 4450066
• OSTI ID: 865016
• Country of Publication: United States
• Language: English

Related Subjects

hydrothermal
pretreatment
prevent
scale
liquefaction
solid
carbonaceous
materials
formation
ranking
coals
similar
significantly
reduced
prevented
believed
convert
scale-forming
components
corresponding
carbonate
prior
accomplished
total
pressure
range
1000
4400
psia
temperature
500
degree
700
scale formation
significantly reduce
scale-forming components
ranking coals
total pressure
carbonaceous materials
carbonaceous material
solid carbonaceous
significantly reduced
similar carbonaceous
solid carbon
prevent scale
corresponding carbonate
/208/