Upgrading solid fuel-derived tars produced by short residence time low pressure hydropyrolysis
AssigneeCities Service Company
InventorMarvin Greene
Life of this patent
Estimating the term…
Abstract
A process for producing and upgrading carbonaceous tars including adding the carbonaceous material into a first reaction zone of a reactor having at least two reaction zones; adding hot hydrogen to the stream of carbonaceous material to effect a reaction with same to produce reaction products; quenching the mixture while insuring that the total residence time varies from about 2 milliseconds to about 2 seconds; removing at least a portion of the reaction products from the quenched mixture; introducing the residual carbonaceous material into a subsequent reaction zone and repeating the steps for the subsequent reaction zone; and introducing carbonaceous tars produced directly into a fluid coking zone to obtain gas, upgraded coal tars, and hot coke.
Claims12
A process of producing and upgrading carbonaceous tars, comprising, in serial combination,
- a. adding liquid or crushed solid carbonaceous material into a first reaction zone of a reactor having at least two non-catalytic reaction zones, and a pressure of between atmospheric pressure and 450 psia;
- b. adding hot hydrogen to the stream of carbonaceous material to effect a reaction with same to produce reaction products, the reaction temperature in the reaction zone varying from about 400.degree. to about 2000.degree. C;
- c. quenching the mixture of step (b) while insuring that the total residence time, including heat-up, reaction and quench time, varies from about 2 milliseconds to about 2 seconds;
- d. removing at least a portion of the reaction products from said quenched mixture of step (c), leaving a residual carbonaceous material;
- e. introducing the residual carbonaceous material into a subsequent reaction zone and repeating steps (a)-(d) for said subsequent reaction zone;
- and
- f. introducing carbonaceous tars produced in step (d) directly into a fluid coking zone to obtain gas, upgraded tars, and hot coke.
A process for producing and upgrading coal tars comprising the steps of:
- a. introducing in a continuous stream of finely divided coal into a first reaction zone of a pressure vessel having at least two non-catalytic reaction zones and a pressure between atmospheric pressure and 450 psia;
- b. continuously adding hot hydrogen to the first reaction zone of the pressure vessel so as to impinge the coal stream and effect a reaction with same to produce coal tar reaction products, the reaction temperature in the reaction zone varying from about 400.degree. to about 2000.degree. C;
- c. limiting contact between the hydrogen and coal stream within the first reaction zone of the vessel to a period of less than 2 seconds;
- d. subsequently quenching the hot hydrogen-coal stream within the first reaction zone with cold hydrogen, so that the total residence time, including heat-up, reaction, and quench times, varies from about 2ms. to about 2 secs.;
- e. removing at least a portion of the coal tars from the quenched hydrocarbon-coal stream leaving residual coal,
- f. introducing the residual coal into a subsequent reaction zone and repeating the steps (a)-(e) for the subsequent reaction zone, and
- g. introducing said coal tars produced directly into a fluid coking zone to obtain gas, upgraded tars, and hot coke.
Dependencies are inferred from the claim text.