Coal tar catalytic upgrading method

Abstract

The invention discloses a coal tar catalytic upgrading method which is as follows: a catalytic segment is added into the coal coking process, a catalyst is put into the catalytic segment, the catalytic segment is arranged between a coke oven coal pyrolysis crude coal gas outlet and an ammonia cooling section, 650 to 800 DEG C discharged crude coal gas from a coke oven directly enters into the catalytic segment to fully contact with the catalyst in the catalytic segment for catalytic cracking of heavy components in coal tar, and then enters into the ammonia cooling section for ammonia condensation. The method can effectively reduce the heavy component content in tar, promote low polycyclic aromatic compound formation, improve the yield of chemical products, increase the tar utilization efficiency and avoid the pipeline blocking problem caused by heavy tar condensation for the reason of systematic temperature change, reduces heavy subsequent purification processing work, and has the good application prospect and economic benefit.

Description

technical field [0001] The invention relates to a method for upgrading coal tar, in particular to a method for realizing on-line lightening of heavy components of coal tar in a coal coking process. Background technique [0002] Coal is the main fossil energy in my country in the next 50 years, and it is the energy guarantee for the development of the national economy. There are many ways of coal processing and utilization, and the coal coking industry to support the steel industry is one of the main ways of processing and utilization. Coal tar is an associated product in the coking process, and its output accounts for about 3% of the coal in the furnace. Tar is rich in unique fused-ring aromatic compounds and is a valuable chemical industry resource. Reasonable processing of coal tar can extract valuable chemical products and improve the utilization efficiency of tar. [0003] In the current tar rectification and separation process, the yield of heavy components of coal t...

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Problems solved by technology

[0006] The shortcomings of the above technologies are mainly reflected in: 1. For the heavy components (bitumen) of coal tar up to 50%, there is no good treatment method at present; 2. The heavy components (bitumen) in the condensed tar It has already been highly condensed, and catalytic cracking is more difficult; 3. After the coal tar is condensed and separated, the light components of the tar are then heated and hydrotreated, and the process consumes more heat

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