Solvent refining method of rubber plasticizer

Abstract

The invention discloses a solvent refining method of a rubber plasticizer. The solvent refining method comprises the following steps: enabling decompressed fraction oil and a solvent to enter an extraction column from an upper part and a lower part of the extraction column respectively; carrying out solvent refining on the decompressed fraction oil and the solvent in the extraction column through counter-current contact; obtaining an extracted solution from the column bottom of the extraction column and recycling the solvent to obtain extracted oil; taking one part of the extracted oil as circulating extracted oil and mixing the circulating extracted oil with the decompressed fraction oil to obtain crude oil; enabling the crude oil to enter the extraction column from the lower part of the extraction column, and carrying out the solvent refining on the crude oil and the solvent entering from the upper part of the extraction column through the counter-current contact; obtaining a refined solution from the column top of the extraction column; and recycling the solvent to obtain refined oil, namely the rubber plasticizer. Extracted oil circulation of aromatic hydrocarbon is carried out, so that the content of the aromatic hydrocarbon is relatively high; and operation conditions in a production process are relatively easy to realize, and the quality of obtained products is improved to a certain extent.

Description

technical field [0001] The invention relates to a solvent refining method for a rubber plasticizer, which belongs to the field of petroleum processing. Background technique [0002] In recent years, some achievements have been made in the development of various environmentally friendly rubber plasticizers at home and abroad, but the production of environmentally friendly rubber plasticizers by conventional solvent refining methods will lead to low aromatic content in the product, which cannot meet the requirements for use. Therefore, research Both of them have improved the conventional solvent refining method, and many patent reports have also occurred. For example, Chinese patent 200810224694.1 and Chinese patent 200810224695.6 disclose a high-yield and low-condensed ring aromatic content rubber plasticizer manufacturing method based on a solvent secondary extraction process, but the production cycle of this method is long and the product yield is low; China Patent CN10214...

AI Technical Summary

Problems solved by technology

[0002] In recent years, some achievements have been made in the development of various environmentally friendly rubber plasticizers at home and abroad, but the production of environmentally friendly rubber plasticizers by conventional solvent refining methods will lead to low aromatic content in the product, which cannot meet the requirements for use. Therefore, research Both of them have improved the conventional solvent refining method, and many patent reports have also appeared.

For example, Chinese patent 200810224694.1 and Chinese patent 200810224695.6 disclose a high-yield and low-condensed ring aromatic content rubber plasticizer manufacturing method based on a solvent secondary extraction process, but the production cycle of this method is long and the product yield is low; China Patent CN102140369A discloses a method for improving the separation effect of aromatics by adding back-extraction solvent to the refined main solvent. Although the effect is achieved, the product yield is not greatly improved, and it has a certain impact on the production of other lubricating oil products; Qualified environmentally friendly rubber plasticizers are obtained by using vacuum residue oil as raw material and using solvent deasphalting-solvent supplementary refining technology, but this product has too high viscosity, is inconvenient to use, and contains asphaltenes, so it is not applicable to the specified IP346 test method, which is controversial in terms of environmental protection

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