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Process for removing mercury from a coal tar product

a technology of coal tar and mercury, which is applied in the direction of hydrocarbon oil treatment, metal treatment, and treatment with plural serial refining stages, etc., can solve the problems of increasing the cost of petroleum and the high cost of coal tar products, and achieves the effect of reducing the cost of petroleum production and reducing the cost of coal tar production

Inactive Publication Date: 2015-05-21
UOP LLC
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AI Technical Summary

Benefits of technology

The invention is a process for removing mercury from a coal tar product. The process involves contacting the coal tar stream with a solvent to remove one or more products, such as elemental mercury, organic mercury compounds, and inorganic mercury compounds. The removed products are then contacted with an adsorbent material to remove the mercury compounds. The remaining coal tar stream is then separated into different fractions. In another embodiment, the process includes using a catalytic distillation zone to separate the coal tar stream into different fractions, with the mercury compounds reacting in the presence of a catalyst to form elemental mercury in one of the fractions. This fraction is then treated to remove the elemental mercury. Overall, the process allows for the efficient removal of mercury from coal tar.

Problems solved by technology

However, petroleum is becoming more expensive because of increased demand in recent decades.
The products from the coal tar often contain undesirable compounds, such as mercury, which must be removed.

Method used

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  • Process for removing mercury from a coal tar product
  • Process for removing mercury from a coal tar product
  • Process for removing mercury from a coal tar product

Examples

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Embodiment Construction

[0012]FIG. 1 shows one embodiment of a mercury removal process 5 of the present invention. The coal feed 10 can be sent to the coking oven zone 15, the gasification zone 20, or the coal feed 10 can be split into two parts and sent to both.

[0013]In the coking oven zone 15, the coal is heated at high temperature, e.g., up to about 2,000° C. (3600° F.), in the absence of oxygen to drive off the volatile components. Coking produces a coke stream 25 and a coal tar stream 30. The coke stream 25 can be used in other processes, such as the manufacture of steel.

[0014]The coal tar stream 30 which comprises the volatile components from the coking process can be sent to an optional contaminant removal zone 35, if desired.

[0015]The contaminant removal zone 35 for removing one or more contaminants from the coal tar stream or another process stream may be located at various positions along the process depending on the impact of the particular contaminant on the product or process and the reason fo...

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Abstract

A process for removing mercury from a coal tar product is described. A coal tar stream is contacted with a solvent to remove a product, and the product stream is contacted with an adsorbent material to remove elemental mercury, organic mercury compounds, and / or inorganic mercury compounds. Alternatively, the coal tar stream can be treated in a catalytic distillation zone of a fractionation zone.

Description

[0001]This application claims the benefit of Provisional Application Ser. No. 61 / 905,902 filed Nov. 19, 2013, entitled Process for Removing Mercury from a Coal Tar Product.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 is used in making ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G53/08
CPCC10G53/08C10G21/16C10G21/27C10G21/28C10G45/02C10G45/08C10G45/12C10G21/06C10G21/14C10G2300/205C10G2300/4087
Inventor GORAWARA, JAYANT K.BEDARD, ROBERT L.JAN, DENG-YANGMAHER, GREGORY F.RENDE, DEAN E.
Owner UOP LLC
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