Hydrogenation preprocessing method for coal tar raw material

Abstract

The invention relates to the field of coal tar processing, and discloses a hydrogenation preprocessing method for a coal tar raw material. The method is implemented in a reaction system comprising a first prehydrogenation reaction region and a second prehydrogenation reaction region and includes the steps that 1, the coal tar raw material to be preprocessed is sequentially degassed and dehydrated to obtain the dehydrated coal tar raw material, wherein the content of dissolved oxygen in the dehydrated coal tar raw material is smaller than 1 microliter / liter, and the content of water is smaller than 500 microgram / gram; 2, in the presence of hydrogen, the dehydrated coal tar raw material sequentially enters the first prehydrogenation reaction region and the second prehydrogenation reaction region. When the method is adopted to process coal tar, the use ratio of a hydrogenation protecting catalyst in the coal tar processing technical process can be remarkably increased, and the method has the advantages of low energy consumption, the simple technology, a long device operation cycle, the high product yield and good characteristics.

Description

technical field [0001] The invention relates to the field of coal tar processing, in particular to a method for hydrogenation pretreatment of coal tar raw materials. Background technique [0002] With the sustained and rapid development of social economy, my country's demand for petroleum products is also increasing. However, petroleum is a non-renewable energy source and is facing a crisis of depletion. In contrast, China has relatively abundant coal reserves, so producing liquid fuel from coal has become a basic direction of coal processing and utilization. [0003] With the rapid growth of the international and domestic steel industry, the coking industry presents a high growth trend, the output of coal tar is increasing, and the clean processing and effective utilization of coal tar are becoming more and more important. At present, the conventional processing method is to cut various fractions with concentrated components through pretreatment distillation, and then use...

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Problems solved by technology

However, coal tar raw material is introduced into the raw material of this method, and the inventor only considered how to solve the coking problem of coal tar and coking distillate oil, and did not consider the removal of metals, etc., resulting in the deposition of metals in the feedstock on the catalyst bed , so that the pressure drop of the bed layer rises too fast, which affects the extension of the operating cycle of the device

[0006] Therefore, how to overcome the defect of using the above-mentioned prior art to process coal tar raw materials, and provide a method for processing coal tar with a simple process and a long device operation period on the basis of low energy consumption to provide a clean fuel with high yield and excellent properties is Key research objectives of researchers in this field

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