CS239848B1 - A method of co-production of high and medium index raffinate and reduced freezing point extract - Google Patents

Abstract

The invention solves the problem of simultaneous obtaining of petroleum oil raffinates with high and medium viscosity index and extract with reduced freezing point and increased aromaticity. Its essence is adding extract from the same or different petroleum oil or their mixture to the extract solution coming from the extraction device, subsequent adjustment of their temperature to 40 to 70 °C, settling and separation into the appropriate phases, from which after distillation of the solvent, medium index raffinate and the above extract are obtained. High index raffinate is obtained in the first refining stage.

Description

239848 3

The present invention relates to co-production of high and medium index raffinate and to an extractively reduced pour point.

According to the author's certificate No. 214 627, the possibility of utilizing the extracts of petroleum oil refining for further refining is possible by adding the distillate and mixing the distillate. The phases formed therefrom and the new raffinate obtained and the new extracts have properties determined by the amount of distillate added to the r-solution extract, solvent to oil ratio (iplusextrate distillate) and temperature; in which the phases are separated. By this method, a new graft can be obtained with an average wavelength index of about 10 units higher than the added distillate in an amount close to the amount of added distillate, or the raffinate is obtained by the viscosity index roughly the same as that of the distillate however, the greater the amount of added distillate.

Emerging. new extracts (reextracts) have a higher aromatic, lower viscous index and lower freezing point.

Author's certificate No. 214 627 discloses the possibility of adding oil distillate to the extract solution leaving the extraction device. This is a drawback, since it is not possible to obtain a medium-index raffinate with substantially increased cyclanicity from the β-ara-petroleum oils.

Cyclic oils have been very well-suited for the production of greases, for manufacturing and insulating oils and for other applications. Because cyclanic oil is increasingly rare, 'The roads are intended to produce oils with enhanced-cyclanicity from petroleum oils.

The solvents used in the refining of oil, at higher temperatures, also dissolve the cyclanes, the solubility of which decreases with decreasing temperature.

According to the literature, heavy polycyclic hydrocarbons are dissolved in furfurale at temperatures above 60 to 80 ° C. Conventional oil and oil extracts, due to the higher oil refining temperatures employed, also contain polycyclines, which are a suitable component of some oils. This problem can be solved by the co-production of high and medium-index raffinate and reduced solidification extract of the present invention, addition of the oil-extract extract solution to the oil-extracting solution, and mixing the mixture to 40-70 ° C. and after separating the phases in the settling from the individual layers, the solvent consisting of the added medium is extracted from the same or other petroleum oil or a mixture thereof in an amount of 10 to 100% by weight. to the extract solution.

The raffinate thus obtained (medium index) has a viscosity index (VI) of 10 to 50 before the dewaxing and an aromatic carbon content (% CA) of approximately two-thirds compared to the starting ones. These characteristics depend on the properties of the base extracts and the working parameters, such as: p-omer of solvent extracts and phase separation temperature. High oil yields and enhanced cyclanicity are also preferred. Přikladl

The process of co-production of high and medium index raffinate and reduced solidification extract is schematically shown in the figure. In the countercurrent extractor 1, the petroleum oil distillate 6 is refined by means of the solvent 5. To extract the extract 7 from the same or another oil 8, the temperature of the mixture is adjusted in the heat exchanger 2, the streams are thoroughly mixed in the mixer 3 and the phase a solution of a high-grade raffinate 9, a medium index rinse 10 and an extract with a reduced re-extract is removed from the extraction part of the apparatus.

Extract solution of medium viscous non-dewaxed distillate, containing 79% by weight. furfural, leaving the extractor at 95 ° C, was mixed with the extract of a pure oil obtained during the previous refining under the same conditions as in the current refining (tract properties: kinematic viscosity at 100 ° C 20.47 mm 2 s -1, VI = -103% CA = 34.0, pour point 24 ° C).

In the resulting mixture the weight / furfural to extract ratio was 2: 1. The mixture was cooled to 60 ° C and partitioned. After the solvent was distilled off, the intermediate index refinate was obtained in 39% by weight, calculated as extracts (kinematic viscosity at 100 ° C 11.67 mm 2 s -1, VI = 40% CA = - 19.6) ) and a reduced freezing point extract (kinematic viscosity at 100 ° C 24.46 millimeters S -1, VI = -171% CA = 43, pour point 14 ° C). Example 3

Extract of a highly viscous non-paraffinic distillate extract containing 80% by weight furfural (kinematic viscosity of this extract at 100 ° C after distillation of the furfural shell 3-4.23 mm 2 s -1) leaving the extract was mixed with the oil extract obtained by deasphalting the residue after vacuum distillation of the oil with a viscosity of 10 ° C. 41.25 mm2 s "1.

The weight ratio of extracts was 1: 1 afurfural to 1.8: 1 extracts. The mixture was cooled to 55 ° C and partitioned. After distilling off the solvent from the individual layers

Claims (1)

An average refined raffinate of 55% by weight was obtained. (calculated on extracts) with kinematic viscosity at 100 ° C 27,15 millimeters2 and viscosity index 25. * SUBJECT TO THE PRODUCTION OF HIGH AND CENTRAL INDEX Raffinate And Extract With Reduced Freezing Point By Adding Medium To Oil Oil Extract Solution Allowing Extraction Device, after mixing, the temperature of the mixture is adjusted to 40-70 ° C. EXPLOSING and separating the phases in the settler, the solvent is distilled off from the individual layers, characterized in that the medium added is an extract of the same or another petroleum oil or a mixture thereof in an amount of 10 to 100% by weight. extract. 1 sheet of drawings