CS239848B1 - Method of processing raffinate with lowered point of congelation - Google Patents

Abstract

invention addresses issues Contemporary zís- Kavan oil oil raffinates with you Sokymat and middle viscosity index and extract the · reduced point Pour and increased aromaticity. his the essence is a addition extract from the same or other- him oil oil or their mixtures to solution of extract that emerging from extraction for management follow treatment their temperature on the 40 until 70 ° C, sedimentation and distribution on the at good phase from those the after distilling solvent gave stredneindexový raffinate and stated extract. High refraction raffinate the gave in first refining degree.

Description

The invention relates to the co-production of high and medium index raffinate and an extract with reduced pour point.

According to author's certificate no. No. 214,627 is based on the possibility of utilizing extracts from petroleum oil refining for further refining by adding the distillate to the solution and mixing it. The phases formed and the new raffinate and the new extract obtained therefrom have properties determined by the amount of distillate added to the extract solution, the solvent to oil ratio (distillate plus extract) and the temperature / phase separation.

By this procedure, a new raffinate with a medium wax index of about 10 units higher than the added distillate in an amount close to that of the added distillate can be obtained, or a raffinate with a viscosity index of approximately the same as the distillate but in a larger quantity than of added distillate.

It arises. new extracts (reextracts have higher aromatic phosphorus, lower viscosity index and lower freezing point).

Author's certificate no. 214,627 discloses only the possibility of adding an oil distillate to the extract solution leaving the extraction apparatus. This is a drawback, since in this way it is not possible to obtain a middle-index raffinate with substantially increased cyclanicity from paraffinic petroleum oils.

Cyclanic oils have proven very successful in the production of greases, for the production of electrical insulating oils and for other uses. As cyclanic oils are increasingly scarce, they are looking for ways to produce cyclanic oils also from paraffinic oils.

Solvents used in oil refining also dissolve cyclanes at higher temperatures, whose solubility decreases significantly as temperature decreases.

According to the literature, heavy polycyclic hydrocarbons dissolve in furfural at temperatures above 60-80 ° C. Conventionally, the oil extracts, because of the higher temperatures used for oil refining, also contain polycyclanes, which are a suitable component of some oils.

This problem can be solved by the method of co-production of high and medium index raffinate and reduced freezing point extract according to the invention, by adding medium to the oil oil extract solution leaving the extraction apparatus, after mixing the temperature of the mixture to 40-70 ^{° C.} After separation of the phases in the settler, the solvent is distilled off from the individual layers, which is characterized in that the medium to be added is an extract of the same or another petroleum oil or a mixture thereof in an amount of 10 to 100% by weight. to extract solution.

The raffinate thus obtained (medium index) has a viscosity index (VI) before dewaxing of 10 to 50 and an aromatic carbon content (% C _A ) of approximately two-thirds of the starting extracts. The values of these characteristics depend on the properties of the starting extracts and on the operating parameters such as: the ratio of extracts to solvent and the phase separation temperature. High oil yields with increased cyclanicity are also an advantage.

EXAMPLE

The process of co-production of high and medium index raffinate and extract with reduced pour point is shown schematically in the figure. In the countercurrent extractor 1, oil oil distillate 6 is refined with solvent 5. To the extract solution 7 is added an extract of the same or another oil 8, the temperature of the mixture is adjusted in the heat exchanger 2, the streams are mixed thoroughly in the mixer 3 and the phases are separated. settler

4. A solution of high-index raffinate 9, intermediate-index raffinate 10, and an extract with reduced freezing point (re-extract) 11 is removed from the extraction section of the apparatus.

Example 1 a d 2

Extract solution of medium viscous, dewaxed distillate, containing 79% by weight. furfural leaving the extra, which at 95 ° C was mixed with the extract of the same oil obtained in the previous conventional refining under conditions identical to the current refining (extract properties: kinematic viscosity at 100 ° C 20,47 mm ² s ^-1 , VI = -103% C _A = 34.0, pour point 24 ° C).

In the resulting mixture, the weight ratio of furfural to extract was 2: 1. The mixture was cooled to 60 ° C and partitioned. Distilling the solvent off gave stredneindexový raffinate in a yield of _39/0 wt., Calculated on the extracts (kinematic viscosity at 100 ° C 11.67 mm ² s ^1, VI = 40% C = _A - 19.6), and the extract reduced freezing point (kinematic viscosity at 100 ° C 24.46 mm _S i, VI = -171,% C _A = 43, freezing point 14 ° C).

Example 3

Extract solution of very viscous, dewaxed distillate containing 80% by weight. furfuryl Ural (kinematic viscosity of the extract at 100 ° C for distillation of furfural · Ural was 34.23 mm ² s ^_1) opúšfajúci extractor extract was combined with the oil obtained by propane deasphalting the vacuum residue after the distillation of crude oil with a viscosity of 1Q0 C. 41.25 mm ² s ¹ .

The weight ratio of extracts was 1: 1 and furfural to extracts 1.8: 1. The mixture was cooled to 55 ° C and partitioned in a separatory funnel. After distilling off the solvent from the individual layers, a medium index raffinate was obtained in a yield of 55% by weight. (calculated for extracts) of kinematic] viscosity at 100 ° C of 27,15 mm ² s ¹ and viscosity index 25.

Claims (1)

A method for co-producing high and medium index raffinate and reduced freezing point extract by adding medium to the oil oil extract solution leaving the extraction apparatus, after mixing the temperature of the mixture to 40-70 ° C. OF THE INVENTION and the phase separation in the settler a solvent is distilled off from the individual layers, characterized in that the medium to be 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.