Crude benzene hydrorefining process

Abstract

The invention relates to effective utilization of a coal coking by-product crude benzene, particularly to a crude benzene hydrorefining process, which comprises: a liquid phase catalytic pre-hydrogenation reaction, a gas phase catalytic pre-hydrogenation reaction, a main catalytic hydrogenation reaction, and extraction rectification of the material obtained from the main catalytic hydrogenation reaction, wherein a raw material pre-separation unit, a hydrorefining unit, a pre-distillation unit, an extraction distillation unit, an aromatic hydrocarbon refining unit, and an xylene distillation unit are arranged. According to the present invention, with the crude benzene hydrorefining process, the heavy benzene in the crude benzene can be hydrogenated to prepared the mixed aromatic hydrocarbon, and the mixed aromatic hydrocarbon can be used as the high-quality blending component for gasoline and diesel oil so as to improve the output value and the added value of the material.

Description

technical field [0001] The invention relates to the effective utilization of crude benzene, a by-product of coal coking, in particular to a crude benzene hydrogenation refining process. Background technique [0002] In recent years, with the continuous development of the national economy, the country's demand for coke has grown rapidly, resulting in a continuous increase in the output of resource-based by-products such as coking crude benzene, because coking crude benzene contains some unsaturated hydrocarbons and organic compounds containing sulfur and nitrogen , such as straight-chain alkane mercaptans, aryl mercaptans, sulfides, thiophene, dibenzothiophene, thioindenes, pyridine, etc., cannot be directly used as organic raw materials, and can only be used after the above impurities are removed. Coking crude benzene The traditional impurity removal method is pickling method. Although this method can partially remove sulfur compounds and other impurities in crude benzene, t...

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Problems solved by technology

[0002] In recent years, with the continuous development of the national economy, the country's demand for coke has grown rapidly, resulting in a continuous increase in the output of resource-based by-products such as coking crude benzene, because coking crude benzene contains some unsaturated hydrocarbons and organic compounds containing sulfur and nitrogen , such as straight-chain alkane mercaptans, aryl mercaptans, sulfides, thiophene, dibenzothiophene, thioindenes, pyridine, etc., cannot be directly used as organic raw materials, and can only be used after the above impurities are removed. Coking crude benzene The traditional impurity removal method is pickling method. Although this method can partially remove sulfur compounds and other impurities in crude benzene, the loss of aromatic compounds is large during the processing process, and the by-product waste acid tar and residues are still free. Effective treatment methods cause environmental pollution, the quality of the final product is quite different from that of petroleum-grade products, the use is relatively limited, the added value is low, and the economic benefits are relatively poor. The prior art shows that the existing crude benzene There are many deficiencies in the refining process, not only is there a lot of waste of raw materials, but also the reaction system is easy to coke and block, and at the same time, it requires high reaction temperature