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Title: Liquefaction process

Abstract

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.

Inventors:
 [1]
  1. (Baytown, TX)
Issue Date:
Research Org.:
Exxon Research and Engineering Co.
OSTI Identifier:
864067
Patent Number(s):
4304655
Assignee:
Exxon Research & Engineering Co. (Florham Park, NJ) OSTI
DOE Contract Number:  
EF-77-A-01-2893
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Poddar, Syamal K. Liquefaction process. United States: N. p., 1981. Web.
Poddar, Syamal K. Liquefaction process. United States.
Poddar, Syamal K. Thu . "Liquefaction process". United States. https://www.osti.gov/servlets/purl/864067.
@article{osti_864067,
title = {Liquefaction process},
author = {Poddar, Syamal K.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

Patent:

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