Method for preparing environmentally-friendly rubber oil through solvent refining and hydrofining combination technology

Abstract

The invention relates to a method for preparing environmentally-friendly rubber oil through a solvent refining and hydrofining combination technology. Aromatic hydrocarbon extract oil in a vacuum fraction is adopted as a raw material, a ternary composite solvent comprising 60-75% by volume of furfural, 20-35% by volume of a polyhydroxy alcohol or a polyhydroxy alcohol ester, and the balance an aqueous NaCl solution is adopted as a solvent in a solvent extraction segment, and extraction oil is obtained under operation conditions comprising that the top temperature of an extraction tower is 50-100DEG C, wherein the oil-solvent volume ratio is 0.5-3.0:1; and then the extraction oil is hydrofined under a high pressure, wherein the high-pressure hydrogenation treatment conditions comprise that the reaction pressure is 15.0Mpa, the reaction temperature is 330-350DEG C, the reaction air speed is 0.3-1.0h<-1> and the hydrogen-oil ratio is 500-1000:1, and a catalyst is a non-precious metal sulfide hydrogenation treatment catalyst treating Ni-W as a hydrogenation active component. Environmentally-friendly rubber oil with the CA percentage characterizing the aromatic hydrocarbon content of above 16 can be prepared through the method, the content of the polycyclic aromatic hydrocarbons (PCAs) in the rubber oil is less than 3%, and the sum of eight PAHs is less than 10mg / kg.

Description

technical field [0001] The invention relates to a method for refining hydrocarbon oil, in particular to a method for preparing environment-friendly rubber oil for tire rubber and its products by using a combined process of solvent extraction and hydrogenation refining. Background technique [0002] Naphthenic oils have relatively lower wax content, lower pour points, and more naphthenic ring structures than paraffinic oils. Due to these characteristics, it is generally used as an operating oil for elastomers such as rubber. [0003] Natural cycloalkyl fractions, with chromophores, sulfur-containing compounds and other impurities (such as basic nitrogen compounds), of course including symbiotic fused-ring aromatic compounds (PNA), must be effectively removed in order to meet the requirements of rubber processing. oil needs. [0004] The traditional methods of processing naphthenic oil include: solvent deacidification, sulfuric acid clay refining, solvent refining, hydrotrea...

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Problems solved by technology

[0005] The disadvantages of the above-mentioned traditional processes are: they cannot meet the compatibility requirements of rubber oil elastomers, and cannot take into account the yield of the target product and the quality of the product

[0009] American Journal of Industrial Medicine 2003, Volume 5, No. 3, disclosed an article about the Toxicological characteristics of refinery streams used to manufacture lubricating oils (Toxicological characteristics of refinery streams used to manufacture lubricating oils). The experimental research of coating on the above proves that the use of conventional solvent refining process to treat lubricating oil components has a good effect on reducing the induced deformity and variation of lubricating oil components, and even if sulfuric acid refining is used, it cannot reduce the lubricating oil components. The distortion induced by the natural components of the components on the human body, other processes such as solvent dewaxing, hydrofining and clay adsorption refining can not improve the distortion induced by the lubricating oil components on the human body

[0010] For aromatic oil extracted from naphthenic distillates, the structure of the aromatic ring is similar to that of the naphthenic ring. If it is used as a raw material, the combined process of conventional furfural solvent refining and high-pressure hydrogenation treatment will be used. Due to the Strong solvency, poor selectivity to polycyclic aromatic hydrocarbons, used to prepare environmentally friendly tire rubber oil with a PCA content of less than 3%, and has the disadvantages of low yield and low total aromatic content

[0011] For aromatics-rich aromatics extraction oil (DAE), mild hydrocracking under simple medium pressure (5.0-12.0MPa) conditions cannot produce products with a PCA content of less than 3%

Under the same pressure level conditions, if severe hydrocracking is carried out, the cracking activity of the catalyst will be lost and carbon deposition will affect the life of the catalyst. At the same time, the ring-opening reaction of single- and double-ring aromatics will affect the retention of aromatics

If the reaction pressure is further increased, DAE is treated under mild conditions (treatment temperature 300°C-360°C) and / or harsh conditions (340°C-400°C) in a high-pressure (greater than 12.0Mpa) environment, which cannot take into account the development of single-ring aromatics. Ring loss and the effect of removing fused ring aromatics, so it is impossible to obtain a product with a PCA content of less than 3% and an aromatics content of CA% reaching 16 or more at the same time