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US 4,394,215 AGranted
Apparatus for converting coal into liquid products
AssigneeSasol One (Proprietary) Limited
InventorsBerend Jager, Andries Brink, Cornelis Kleynjan
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AssigneeSasol One (Proprietary) Limited
InventorsBerend Jager, Andries Brink, Cornelis Kleynjan
Estimating the term…
The invention provides a process and an apparatus for hydrogenative liquefaction of coal to produce high yields of gasoline fraction and optional yields of diesel and residue fraction, all of superior quality. The coal is slurried and digested in two separate and distinct streams. The pasting oil of the first stream is heavy residue fraction derived to a substantial extent from the second stream, preferably mixed with light oil derived partly or wholly from the first stream. The pasting oil of the second stream is middle oil derived from the fractionated discharge of the first stream, any shortfall being made up from the discharge of the second stream. A high degree of flexibility is possible by varying the ratio of coal fed to the respective streams between 3:1 and 1:3, and individual manipulation of the process parameters within each stream in respect of pressure, temperature, catalyst, residence time, pasting oil composition and coal quality.
An apparatus for carrying out a coal liquefaction process comprising in parallel separate and distinct first and second coal digestion reactors for digesting particulate coal in a pasting oil under pressure, first and second separate and distinct coal slurrying means feeding separately into the first and second reactors respectively, fractionating means coupled to said first and second reactors and adapted to produce light oil, middle oil and heavy or residue fractions, means for recycling to the first slurrying means heavy or residue fraction derived at least in part from the discharge of the second reactor, means for recycling to the second slurrying means middle oil derived at least in part from the discharge of the first reactor, and means for discharging as a product light oil derived from the discharge of the second reactor.
Dependencies are inferred from the claim text.