Production method of environment-friendly rubber oil

Abstract

The invention relates to a method for refining vacuum gas oil, which can be used for producing environment-friendly rubber extending oil with a high content of aromatic hydrocarbon and a low content of polyaromatic hydrocarbon. The method is characterized in that furfural, N-methyl pyrrolidone, phenol and dimethyl sulfoxide are used as solvent for extraction in an extraction tower, the solvent is fed in from the upper part of the extraction tower, vacuum distillate is fed in from the lower part of the extraction tower, the solvent and the vacuum distillate are in countercurrent contact, then refined solution flows out of the top of the extraction tower, and refined oil can be obtained after solvent recovery through evaporation and stripping; and primary extract solution on the tower bottom is fed into the middle upper part of a secondary extraction tower, extract oil is fed into the lower part of the secondary extraction tower, fresh solvent is fed into the upper part of the secondary extraction tower, then secondary refined solution flows out of the top of the secondary extraction tower, secondary refined oil can be obtained after solvent recovery through evaporation and stripping and can be used as the environment-friendly rubber extending oil with a high content of aromatic hydrocarbon, secondary extract solution flows out of the bottom of the secondary extraction tower, extract oil can be obtained after solvent recovery through evaporation and stripping, part of the extract oil returns to the lower part of the secondary extraction tower, and the rest of the extract oil is thrown out as the product.

Description

technical field [0001] The invention belongs to the field of petroleum and petroleum fraction refining, and relates to a method for producing and refining special oil products in the petroleum processing process. The International Patent Classification belongs to C10G 21 / 00. Background technique [0002] Rubber is a high polymer with high elasticity, toughness and considerable strength. It is widely used in modern society. Whether it is automobiles, aviation, navigation and other transportation industries, or construction, cutting-edge technology, medicine and health, daily life, etc., rubber is inseparable. Therefore, rubber has played an inestimable role in promoting the development of the national economy and improving people's living standards. Add a certain amount of rubber filling oil (referred to as rubber oil) to the rubber material, and the rubber products produced are soft and have good elasticity. [0003] Rubber extender oil is one of the important raw material...

AI Technical Summary

Problems solved by technology

[0004] In terms of the production of environmentally friendly rubber oil, some production methods have been proposed at home and abroad, such as the patent application No. 200910050832.3, which proposes to use furfural, phenol and other solvents to extract and remove polycyclic aromatic hydrocarbons in raw oil, and then recycle the solvent to obtain environmentally friendly aromatic hydrocarbons. Oil, the method used in this method is consistent with the current method, and there is no novelty; the existing problem is that it is difficult to achieve continuous production and quality that can meet the requirements simply by using the traditional solvent extraction process

The traditional lubricating oil refining process is to use furfural, phenol, N-methylpyrrolidone (NMP) and other solvent refining processes to remove polycyclic aromatic hydrocarbons and colloids. This process generally uses an extraction tower, and the solvent enters from the upper part of the tower. The oil enters from the lower part of the tower, and the two are in countercurrent contact in the tower. The refined liquid flows out from the upper part of the tower and enters the heating furnace and the evaporation stripping tower, and the refined oil is obtained after recovering the solvent; Extracted oil is obtained after recovering the solvent in the extraction tower. The refined oil obtained by this process is mainly used as lubricating oil. If it is used as rubber oil because of its low aromatic content and poor compatibility with rubber, it is rarely used. The extracted oil obtained at the bottom of the tower can be used As an ordinary rubber filling oil, but generally can not be used as an environmentally friendly rubber filling oil, because it contains a large amount of polycyclic aromatic hydrocarbons (PCA), more than 10%, so many researchers have proposed new refining or production methods

The application of patent application 200910088931.0 proposed a refining method, that is, the third-line raw material oil and furfural are contacted countercurrently in the extraction and extraction tower as mentioned above, and the solvent is recovered from the bottom of the tower to obtain the extracted oil, and then the extracted oil is subjected to secondary extraction. Extraction, the refined oil obtained by secondary extraction is environmentally friendly rubber oil; the application of patent application 200910088932.5 proposes another refining method, that is, the third-line raw material oil and furfural are contacted countercurrently in the extraction tower as described above, and after the solvent is recovered The refined oil is obtained, and then the refined oil is subjected to secondary extraction, and the extracted oil obtained by the secondary extraction is environmentally friendly rubber oil. These two patent applications need to first recover the solvent from the extracted liquid or refined liquid (both containing furfural and oil), and then carry out Secondary extraction requires multiple extractions and solvent recovery, high energy consumption, large equipment investment, and complicated process

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