Method for removing sulfide from oil products with high aromatic hydrocarbon content

Abstract

The invention provides a method for removing sulfides in a high aromatic hydrocarbon content oil product. The method comprises the following steps: 1) the mixed liquid of monatomic organic low-carbon acid and inorganic acid, vitriol acid salt or acid salt of phosphoric acid with the mol concentration ratio of 1 to between 4 and 9 to 2 is prepared, the mixed acid prepared is mixed with an oxidant according to the volume ratio of between 10 to 1 and 1 to 5, and the mixed solution is mixed with raw oil according to the volume ratio of between 1 to 8 and 9 to 1 to form an oil-water two phase medium; 2) the medium is subjected to emulsion breaking and split phase; and 3) by a composite extractant consisting of a polar solvent in which the aromatic hydrocarbon is not dissolved and water, the oil product after oxidation is subjected to extraction, the polar solvent is mixed with the water according to the volume ratio of between 2 to 1 and 1 to 4 to obtain the composite extractant, and the sulfides in the oil product are removed to obtain a low-sulfur product. The method can be applied to the desulfating process of heavy oil and the high aromatic hydrocarbon content oil product, and the method also has the advantages of low cost, simple method, good desulfating effect and no secondary pollution, and meets the requirement of an environment-friendly chemical engineering process.

Description

Technical field [0001] The invention belongs to the technical field of desulfurization in petrochemical industry, and particularly relates to a method for removing sulfide from high-content aromatic oil products. Background technique [0002] With the heavy and degraded petroleum raw materials, the content of aromatic hydrocarbons in petroleum raw materials and products gradually increases. As aromatics are important chemical raw materials, for example, C9 aromatic fuel oil is an important gasoline additive, organic solvent, and also an important raw material for the production of resins and carbon black. Therefore, removing sulfides from aromatic oils and maintaining aromatics content has gradually become the focus of scientific researchers, but there is no efficient desulfurization method for C9 aromatics. [0003] At present, the technology for producing low-sulfur petroleum products is mainly hydrodesulfurization technology (HDS). Under high temperature and high pressure cond...

AI Technical Summary

Problems solved by technology

Although this patent provides a method with relatively high selectivity, it is only suitable for oil products with low aromatic content. For oil products with aromatic hydrocarbons and other unsaturated hydrocarbon content as high as 70% or even more than 98%, due to the high content of aromatic hydrocarbons on the reaction The solvent and the subsequent extractant have a fairly high solubility, so this process is still not suitable for oils with high aromatic content

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