a cleavage c 9+ Hydrogenated solvent oil denaphthalene process and low naphthalene aromatic hydrocarbon solvent oil

Abstract

The invention relates to a process method for removing naphthalene from pyrolysis C<9+> hydrogenation solvent oil as well as low-naphthalene aromatic solvent oil. The method comprises the following steps: dipping a porous hydrophilic carrier into an aqueous solution of a naphthalene-removing agent and filtering to obtain a supported naphthalene-removing agent, wherein the naphthalene-removing agent is at least one of sulfite and bisulfate; and filling a fixed bed with the supported naphthalene-removing agent, performing naphthalene-removing treatment on the pyrolysis C<9+> hydrogenation solvent oil through the fixed bed filled with the supported naphthalene-removing agent at the air speed being not more than 20 h<-1>, and drying to obtain the low-naphthalene aromatic solvent oil. The naphthalene-removing process is simple, capable of performing continuous operation and high in naphthalene-removing efficiency, the naphthalene is easy to recover and the supported naphthalene-removing agent is easy to regenerate in the subsequent treatment, equipment is not corroded, environmental pollution is avoided, and the problems of low rectification and deep hydrogenation efficiency and high cost are solved. According to the low-naphthalene aromatic solvent oil prepared by the naphthalene-removing method, the dissolving capacity is high, the naphthalene content is ultrahigh and reaches 10 ppm or less, the European and American standards can be met and wide application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of industrial naphthalene removal, in particular to a cracking C 9+ Hydrogenated solvent oil denaphthalene process and low naphthalene aromatic hydrocarbon solvent oil. Background technique [0002] cleavage C 9+ Distillate is a by-product of petroleum cracking to produce ethylene, accounting for about 10% to 20% of the total weight of cracking products. With the rapid development of my country's petrochemical industry, especially the continuous improvement of ethylene production capacity, cracking C 9+ The production of distillates continues to increase. cleavage C 9+ The composition of the distillate is complex, and the boiling points of the monomers contained are similar, so it is difficult to carry out fine separation. For a long time, except for a small amount of petroleum resin and solvent oil, most of it is used as fuel. cleavage C 9+ The distillate is rich in aromatics and is an important sour...

AI Technical Summary

Problems solved by technology

Cracked C produced by two-stage hydrogenation 9+ The content of naphthalene and its homologues (hereinafter collectively referred to as naphthalene) in hydrogenated solvent oil is generally higher than 100ppm. Because naphthalene is carcinogenic, it seriously affects the quality and safe use of solvent oil. Therefore, it is necessary to develop a method that can crack C 9+ Hydrogenated solvent oil denaphthalene process

[0004] At present, there are usually two methods for removing naphthalene in industry: one is rectification, but due to the cracking of C 9+ The monomer boiling point of hydrogenated solvent oil is similar, so it is more difficult to separate by rectification separation method; to improve the separation efficiency, it is necessary to increase the height of the rectification tower, and the cost is high

The second is to crack C 9+ Deep hydrogenation of hydrogenated solvent oil, hydrogenation of naphthalene into tetrahydronaphthalene, but this method requires the use of noble metal catalysts, and noble metal catalysts are prone to excessive hydrogenation into saturated decahydronaphthalene, decahydronaphthalene is cycloalkane, dissolved Not as powerful as aromatics; therefore, the method is costly and poorly selective, which greatly limits its application