Liquefaction process

Patent · Thu Jan 01 00:00:00 EST 1981

OSTI ID:864067

Poddar, Syamal K ^[1]

---

1. Baytown, TX

Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with a combination of pretreating agents comprising SO.sub.2 and an oxidizing agent. It is essential to effective operation that the moisture content of the solid carbonaceous material be within the range from about 10 to about 25 wt %, based on dry solid carbonaceous material, during the pretreatment. The pretreatment is believed to convert at least a portion of the scale-forming components and particularly calcium, to the corresponding sulfate prior to liquefaction. The pretreatment may be accomplished with the combination of pretreating agents either simultaneously by using a mixture comprising SO.sub.2 and a gaseous oxidizing agent or sequentially by first treating with SO.sub.2 and then with an oxidizing agent.

• Research Organization: Exxon Research and Engineering Co.
• DOE Contract Number: EF-77-A-01-2893
• Assignee: Exxon Research & Engineering Co. (Florham Park, NJ)
• Patent Number(s): US 4304655
• OSTI ID: 864067
• Country of Publication: United States
• Language: English

Related Subjects

liquefaction
process
scale
formation
ranking
coals
similar
carbonaceous
materials
significantly
reduced
prevented
pretreatment
combination
pretreating
agents
comprising
oxidizing
agent
essential
effective
operation
moisture
content
solid
material
range
10
25
wt
based
dry
believed
convert
portion
scale-forming
components
particularly
calcium
corresponding
sulfate
prior
accomplished
simultaneously
mixture
gaseous
sequentially
treating
scale formation
significantly reduce
scale-forming components
dry solid
ranking coals
moisture content
carbonaceous materials
liquefaction process
carbonaceous material
solid carbonaceous
mixture comprising
significantly reduced
oxidizing agent
similar carbonaceous
solid carbon
sulfate prior
particularly calcium
pretreating agents
gaseous oxidizing
oxidizing agen
agents comprising
/208/