METHOD FOR PRODUCING NON-CARCINOGENIC AROMATIC PROCESS OIL

摘要

The present invention relates to the chemical or petroleum-processing industry and can be used in the production of petroleum plasticizers for synthetic rubber and tyres. In the method for producing non-carcinogenic aromatic process oil, containing a PCA extract of less than 3.0% according to the IP-346 method, said method comprising purifying the oil fractions of petroleum with selective solvents and separating the extract, additionally processing the extract with a polar solvent and producing a raffinate as the end product, the polar solvent used is a mixture of dimethylsulphoxide and Nmethylpyrrolidone, which is used for preliminary processing of the extract, wherein, after the preliminary processing, the mixture of extract and polar solvent is filtered, divided and the light phase is sent to the additional processing of the extract with the polar solvent, and the heavy phase is sent to a polar solvent regeneration stage. The ratio of dimethylsulphoxide to N-methylpyrrolidone in the mixture is within the range of 1:0.1-0.5. The ratio of polar solvent to extract in the additional processing stage is within the range of 1.5-2.5:1. The ratio of polar solvent to extract in the preliminary processing stage is within the range of 0.1-0.3:1. The technical result consists in increasing the efficiency of the process by preventing the formation of an intermediate layer in the extractor column, by reducing the ratio of solvent:extract, and, as a consequence, by increasing the productivity of the plant, simplifying the process of drying the solvent, and eliminating a paraffin-naphthene solvent, which substantially simplifies the regeneration of extractant from the raffinate solution.

主权项

1. A process for producing non-carcinogenic aromatic process oil containing less than 3.0% of a PCA extract according to the IP-346 method, said process comprising the steps of refining petroleum oil fractions with selective solvents and separating an extract, additional treatment of the extract with a polar solvent and producing a raffinate as a desired product; and said process is characterized in using a mixture of dimethyl sulphoxide and N-methylpyrrolidone as a polar solvent, the extract is pretreated with said mixture, and, after the pretreatment, a mixture of the extract and polar solvent is filtered, separated, and the light fraction is directed to additional treatment of the extract with a polar solvent, and the heavy fraction is directed to a step of regeneration of the polar solvent.