Low-temperature crude benzene hydrogenation process

Abstract

The invention discloses a low-temperature crude benzene hydrogenation process which comprises the following steps: S1, primary distillation: filtering a raw material of crude benzene, feeding the filtered raw material into a distillation mechanism, and separating a crude benzene component at the top of the distillation mechanism; S2, liquid-phase catalytic pre-hydrogenation: mixing the crude benzene component in the S1 with hydrogen, and conducting heating to 80-140 DEG C under the condition of Co-Mo serving as a catalyst and hydrogen oil, so as to obtain a first product; and S3, gas-phase catalytic pre-hydrogenation: heating the first product obtained by liquid-phase catalytic pre-hydrogenation in the S2 to 160-210 DEG C under the condition of NiW serving as a catalyst and hydrogen oil to obtain a second product. According to the process, unsaturated olefin in crude benzene is hydrogenated to prepare saturated hydrocarbon at a low reaction temperature. The condition that unsaturated hydrocarbon which is contained in the crude benzene and is easily polymerized at high temperature is polymerized and coked at high temperature to block a system in a subsequent process is avoided, the processing technology is reduced, and the processing quality is improved.

Description

technical field [0001] The invention relates to the technical field of hydrogenation process, in particular to a low-temperature hydrogenation process of crude benzene. Background technique [0002] With the development of the organic synthesis industry, the demand for industrial pure benzene is increasing, and the increasing shortage of petroleum resources has seriously restricted the output of petroleum crude benzene. As another source of pure benzene, coking crude benzene is becoming more and more important. However, due to the improvement of environmental quality requirements, countries around the world have increasingly strict restrictions on the amount of sulfur in oil products. Coking crude benzene is a light fraction recovered from coal coking crude gas, the main components are benzene, toluene, xylene, and a small amount of non-aromatic components. In its purification process, the most critical thing is the removal of organic sulfur and coking substances. [0003...

AI Technical Summary

Problems solved by technology

[0003] In the crude benzene hydrogenation process, the crude benzene needs to be pre-hydrogenated to remove diolefins, styrene and other substances before it can undergo deep desulfurization, denitrogenation and other reactions. During the processing process, the loss of aromatic compounds is large, and the by-product waste acid tar There is still no effective treatment method for residues and residues, which causes environmental pollution. The quality of the final product is quite different from that of petroleum-grade products. There are relatively large limitations in use, low added value, and relatively poor economic benefits. There are many deficiencies in the process, not only the waste of raw materials, so we propose a crude benzene low-temperature hydrogenation process to solve the above problems