Extraction of depolymerized carbonaceous material using supercritical ammonia
AssigneeAir Products and Chemicals, Inc.
InventorsSwaminathan Sunder, Robert N. Miller
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Abstract
Improved extraction and recovery of carbonaceous products are achieved by the aqueous alkali depolymerization of carbonaceous materials, low rank coals, followed by the supercritical extraction with ammonia when the depolymerized material retains a significant aqueous presence.
Claims7
An extraction process for separating solid depolymerized carbonaceous product from carbonaceous materials selected from the group of wood, peat and low rank coals which are subjected to a depolymerization pretreatment in an aqueous alkali medium at elevated temperature and pressure, wherein the extraction is performed with ammonia under supercritical conditions on said pretreated solid materials which are retained in an aqueous presence subsequent to pretreatment such that the materials have an incipient moisture content of at least 30% during extraction.
Dependencies are inferred from the claim text.