<p>CASE 3999/4113 "IMPROVEMENTS IN FILRATION" In the extraction of coal using a liquid solvent oil, filtration can be assisted by using a filter aid which is of coal origin. The filter aid is produced by high temperature processing of coal or an ash-rich coal-derived residue under conditions at which the ash component of the coal or residue does not fuse. A preferred starting material is filter cake from a coal extraction process.</p>
申请公布号
CA1127103(A)
申请公布日期
1982.07.06
申请号
CA19790335780
申请日期
1979.09.17
申请人
COAL INDUSTRY (PATENTS) LIMITED, HOBART HOUSE, GROSVENOR PLACE, LO