Process for pyrolysis of coal

Inactive Publication Date: 2015-05-21
UOP LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a process to convert coal into a mix of oil and gas called cyrolysis. The process separates the oil from the gas and then uses hydrogen to make the oil into a recycled gas that is re-introduced into the pyrolysis process. This helps to convert a greater amount of coal into oil. Additionally, the process also allows for the recovery of certain products from the oil.

Problems solved by technology

However, petroleum is becoming more expensive because of increased demand in recent decades.
While lighter hydrocarbon streams from coal tar can be more easily processed to produce desirable products, the pitch stream includes aromatic cores that make the pitch more difficult to react in further processing.

Method used

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  • Process for pyrolysis of coal
  • Process for pyrolysis of coal

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Embodiment Construction

[0011]The Figure shows one embodiment of a coal conversion process 5 of the present invention. A coal feed 10 is sent to a pyrolysis zone 15. In some processes, all or a portion of the coal feed 10 is also sent to a gasification zone (not shown), where the coal feed is mixed with oxygen and steam and reacted under heat and pressure to form syngas, which is a mixture of carbon monoxide and hydrogen. The syngas can be further processed using the Fischer-Tropsch reaction to produce gasoline or using the water-gas shift reaction to produce more hydrogen. The coal feed 10 can be sent to the pyrolysis zone 15, the gasification zone, or the coal feed 10 can be split into two parts and sent to both.

[0012]In the pyrolysis zone 15, the coal feed 10 is heated at high temperature, e.g., up to about 2,000° C. (3,600° F.), in the absence of oxygen to drive off the volatile components. Pyrolysis produces a coke stream 25 and a coal tar stream 20. The coke stream 25 can be used in other processes, ...

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Abstract

A process for pyrolyzing a coal feed is described. The coal feed is pyrolyzed into a coal tar stream and a coke stream in a pyrolysis zone. The coal tar stream is fractionated into at least a pitch stream. The pitch stream is hydrogenated, and the hydrogenated pitch stream is recycled into the pyrolysis zone. The hydrocarbon stream may be processed further by at least one of hydrotreating, hydrocracking, fluid catalytic cracking, alkylation, and transalkylation.

Description

RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application No. 61 / 906,010, filed on Nov. 19, 2013, the entirety of which is incorporated 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 can be u...

Claims

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Application Information

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IPC IPC(8): C10G1/00
CPCC10G1/002C10G1/02C10G1/06C10G1/08
InventorBARGER, PAUL T.BRICKER, MAUREEN L.KOCAL, JOSEPH A.LIPPMANN, MATTHEW
OwnerUOP LLC