Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Defibration by projection or explosion
Reexamination Certificate
2007-03-13
2007-03-13
Hug, Eric (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Defibration by projection or explosion
C162S090000, C162S014000, C162S016000, C162S078000, C162S079000, C162S065000, C162S068000, C162S056000, C435S161000
Reexamination Certificate
active
10373588
ABSTRACT:
This invention relates to a process of treating a lignocellulosic material to produce bio-ethanol. The process includes the steps of: (a) exposing the lignocellulosic material to conditions including a pH not less than about 8, and steam at a first pressure, to produce a step (a) product; (b) explosively discharging the step (a) product to a second pressure less than the first pressure to produce a step (b) product; and (c) further processing the step (b) product to produce bio-ethanol and other co-products. In another embodiment, the invention relates to a conical auger fractionation column. The fractionation column includes a column body having an input and an output. A conical filter is positioned inside the column body, the filter having a larger diameter end directed toward the input and a smaller diameter end directed toward the output. A conical auger is positioned inside the conical filter, the conical auger having an outer diameter which is approximately the same as an inner diameter of the conical filter. The auger and filter are adapted to cooperate to separate cellulosic solids from a liquid stream in a process of producing bio-ethanol from a lignocellulosic material.
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TAPPI 1997, “Continuous Steam Explosion Pulping: Process Optimization . . . ”, pp. 1-13 of 13.
Butzel Long
Hug Eric
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