Appeal No. 1997-1536
Application 08/342,817
carbonaceous chargestocks include coal and coal slurries in a
hydrocarbon diluent. By "coal", patentees intend anthracite,
bituminous, semi-bituminous, lignite and peat (column 3, line
54 through column 4, line 5).
Marten is directed to the conversion of relatively low-
value coal and gypsum to valuable gas streams and solid
products (column 1, lines 6 through 11). The process includes
reacting coal in a coal gasification zone in the presence of
oxygen and sulfur dioxide-containing atmosphere under partial
coal gasification conditions to produce carbonaceous char and
a crude coal gas stream (column 2, lines 5 through 9). The
carbonaceous char is fed into a gypsum reactor to produce
sulfur dioxide-containing gas (column 3, lines 7 through 42).
The first step in the process produces carbonaceous char and a
crude gas stream (column 3, lines 43 through 59; column 4,
lines 45 through 52; column 6, lines 57 and 58). Suitable
coals include lignite, subituminous and bituminous (column 5,
lines 1 and 2). The coal has a residence time in the oxygen-
lean atmosphere of the gasifier sufficient to produce a
gaseous effluent and carbonaceous char (column 5, lines 48
8
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