Process for pyrolyzing coal using a recycled hydrogen donor
a hydrogen donor and pyrolysis technology, applied in the field of pyrolysis coal using a recycled hydrogen donor, can solve the problems of increasing the cost of petroleum, and achieve the effect of reducing the pressure in the pyrolysis zone and maintaining the pressur
Inactive Publication Date: 2015-05-21
UOP LLC
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Benefits of technology
The patent describes a process for pyrolyzing coal using a recycled hydrogen donor. The process involves heating the coal feed to a high temperature in the absence of hydrogen and then introducing a hydrogen donor solvent. The pressure in the pyrolysis zone is increased to create a coke stream and a coal tar stream. By controlling the amount of hydrogen donor solvent introduced, the amount of coke produced can be controlled. The technical effect of this process is the ability to produce a high-quality coke with reduced emissions and increased efficiency.
Problems solved by technology
However, petroleum is becoming more expensive because of increased demand in recent decades.
Method used
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[0011]The FIGURE shows one embodiment of a coal pyrolysis process 5. A coal feed 10 can be sent to a pyrolysis zone 15, such as a coking oven. Alternatively, the coal feed 10 can be sent to a gasification zone 20, or be split into two parts and sent to both the pyrolysis zone 15 and the gasification zone 20.
[0012]In the pyrolysis zone 15, the coal is heated to high temperature in the absence of oxygen to produce a coke stream 25 and a coal tar stream 30. In particular, the coal feed 10 is first heated to a temperature of about 300° C. in the absence of hydrogen. This initial heating begins to drive off volatile compounds.
[0013]Once the coal has been heated to about 300° C., a hydrogen donor solvent 75 is introduced into the pyrolysis zone 15. The temperature in the pyrolysis zone 15 is then increased to bring the coal feed 10 and the hydrogen donor solvent 75 to a temperature of about 475° C. The pressure in the pyrolysis zone 15 is also increased so that the pressure in the pyrolys...
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Abstract
A process for pyrolyzing coal using a recycled hydrogen donor includes introducing a coal feed to a pyrolysis zone and heating the coal feed to a temperature of about 300° C. in the absence of hydrogen. A hydrogen donor solvent is introduced to the pyrolysis zone after the coal feed is heated to about 300° C., and the temperature of the coal feed and the hydrogen donor solvent is increased to about 475° C., while increasing a pressure in the pyrolysis zone to at or above a vapor pressure of the hydrogen donor solvent. At least an aromatic hydrocarbon rich fraction is separated from the coal tar stream and hydrogenated. The hydrogenated aromatic hydrocarbon rich fraction is recycled to the pyrolysis zone as the hydrogen donor solvent.
Description
RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application No. 61 / 905,931 filed on Nov. 19, 2013, the entirety of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Many different types of chemicals are produced from the processing of petroleum. However, petroleum is becoming more expensive because of increased demand in recent decades.[0003]Therefore, attempts have been made to provide alternative sources for the starting materials for manufacturing chemicals. Attention is now being focused on producing liquid hydrocarbons from solid carbonaceous materials, such as coal, which is available in large quantities in countries such as the United States and China.[0004]Pyrolysis of coal produces coke and coal tar. The coke-making or “coking” process consists of heating the material in closed vessels in the absence of oxygen to very high temperatures. Coke is a porous but hard residue that is mostly carbon and inorganic ash, which ca...
Claims
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IPC IPC(8): C10B57/04C10C1/18C10C1/08
CPCC10B57/045C10C1/18C10C1/08C10J3/00C10K3/04C10B57/08C10B57/12C10C1/205C10J2300/093C10J2300/0959C10J2300/0976C10J2300/1659
Inventor COUGHLIN, PETER K.CHEN, JOHN Q.FREY, STANLEY J.JOHNSON, JAMES A.THAKKAR, VASANT P.
Owner UOP LLC