Light aromatic hydrocarbon hydrogenation pre-hydrogenation process

Abstract

The invention provides a light aromatic hydrocarbon hydrogenation pre-hydrogenation process, wherein the process includes the following steps: a deweighted product oil after deweighting comes from a tank area, is pressurized to 2.1 MPa by a hydrogenation feed pump and is mixed with a pre-hydrogenation reaction circulating liquid and new hydrogen, then the mixture enters an inlet distributor of thebottom of a pre-hydrogenation reactor, and then passes through a catalyst bed layer from bottom to top; selective hydrogenation reaction of diene, styrene and a small amount of monoolefins is preformed; a liquid phase circulating material extracted from the side face of the pre-hydrogenation reactor is pressurized by a pre-hydrogenation circulating pump, is cooled by a pre-hydrogenation circulating cooler, is mixed with new hydrogen and raw materials, enters an inlet of the pre-hydrogenation reactor again, is circulated, is discharged from the top of the pre-hydrogenation reactor and is subjected to main hydrogenation reaction. Through the process, the olefin content of the pre-hydrogenated oil product of the process is obviously reduced, the bromine number is also obviously reduced, coking of the main hydrogenation reaction is effectively prevented, the main hydrogenation reaction with high catalytic activity is completed, and the operation cycle of the device is long.

Description

technical field [0001] The process relates to the technical field of chemical processing, in particular to a process for hydrogenation and prehydrogenation of light aromatics. Background technique [0002] The cracking of light aromatic hydrocarbons contains more impurities such as sulfides, nitrides, oxides and some unsaturated hydrocarbons. The existence of these substances will deteriorate the properties of oil products, so that the products cannot meet the requirements. It is necessary to saturate these unsaturated hydrocarbons, remove sulfur, nitrogen, and oxygen compound impurities, and improve the quality of the product at the same time. Before removing sulfur, nitrogen, and oxygen compound impurities, a pre-hydrogenation reaction is carried out, which saturates the diene and prevents coking in the main hydrogenation reaction. Invention content: [0003] In order to solve the technical problems existing in the background technology, the present invention proposes a...

AI Technical Summary

Problems solved by technology

[0002] Cracking of light aromatic hydrocarbon aromatic components contains more impurities such as sulfides, nitrides, oxides and some unsaturated