发明名称 |
Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation |
摘要 |
Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with a pretreating agent selected from the group consisting of phthalic acid, phthalic anhydride, pyromellitic acid and pyromellitic anhydride. The pretreatment is believed to convert the scale-forming components to the corresponding phthalate and/or pyromellitate prior to liquefaction. The pretreatment is accomplished at a total pressure within the range from about 1 to about 2 atmospheres. Temperature during pretreatment will generally be within the range from about 5 DEG to about 80 DEG C.
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申请公布号 |
US4332668(A) |
申请公布日期 |
1982.06.01 |
申请号 |
US19790023565 |
申请日期 |
1979.03.26 |
申请人 |
EXXON RESEARCH & ENGINEERING CO. |
发明人 |
BRUNSON, ROY J. |
分类号 |
C10G1/04;(IPC1-7):C10G1/04;C10G1/00 |
主分类号 |
C10G1/04 |
代理机构 |
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