SU735626A1 - Method of oil fraction purification - Google Patents

Description

(54) METHOD FOR C5 CLEANING OIL FRACTIONS

The invention relates to oil refining and relates to a method for the selective purification of oil fractions with phenol. There is a method for selective purification of oil fractions with phenol in a column type extractor, in which it feeds raw materials to the column filled with packing mainly from Raschig's ceramic rings, phenol in the middle part, and from 3 to 15% of water in the calculation per charged phenol. As a result of countercurrent extraction, two phases are formed in the column (in the upper mouth of the raffinate and in the lower - extract O. As the target extraction products from the top of the column, the mixture of raffinate with phenol is removed, and from the bottom - a mixture of phenol and water extra The main disadvantage of this method is the relatively low clarity of separation of the raw material into raffinate and extract, resulting in up to 1 O-2 O% unwanted hydrocarbons remaining in the raffinate and the same amount of oil hydrocarbons. leaves with the extract; therefore, the performance properties of commercial oils deteriorate and especially quality indicators such as viscosity index, color, coke, sulfur content and a number of others. In addition, the low definition of carbon separation is due to the increased solubility of oil hydrocarbons in phenol. Although the addition of water as an anti-solvent to the zone of the extract solution also reduces the carryover of oily hydrocarbons with the extract solution due to the excitation in this zone of the recycle, but at the same time the selective properties of phenol deteriorate, which leads to a deterioration in the clarity of the separation of hydrocarbons into the desired and undesirable parts. For these reasons, it is not possible to simultaneously achieve the desired output of the raffinate and the extract with the desired quality. There is also known a method for purifying oil fractions by treating them with phenol to obtain raffinate and extract

solutions in cooTBeTdTByrofflHx zones, followed by phenol regeneration to form raffinate and extract, in which, in order to further extract useful hydrocarbons, the extract solution is sent to a settling tank before phenol regeneration and treated with additional phenolic water. The secondary raffinate phase thus isolated is returned to the zone of the extract solution of the main extractor 2.

This method allows to increase the yield of raffinate, however, in this case there is an additional deterioration in the viscosity and temperature properties of its 3ai account due to the additional involvement of undesirable hydrocarbons.

The purpose of the invention is to improve the quality and increase the yield of oil fractions.

The goal is achieved by the fact that the B method of purifying oil fractions by treating them with phenol to obtain raffinate and extracts in solutions in the respective zones with feeding the secondary raffinate phase to the zone of extract solution and subsequent regeneration of the phenol to obtain raffinate and extract, to the zone extract solution is additionally supplied with 1O-5O vol.% extract. The secondary raffinate phase is fed in the amount of 5-30 vol.% To the purified fractions.

The essence of the invention consists in the fact that in the lower part of the extract zone of the core extractor an additional 10% by volume of dephenolized extract is supplied. The excitation of the risykle in the extract zone of the main extractor is carried out instead of phenolic water by the extract, as a result of which the distribution of hydrocarbons between the refinate and extract is changed, as well as the group hydrocarbon composition of the secondary raffinate, which ensures the achievement of the goal,

Example 1, Deasphalted oil from a mixture of oil (Romashki and Kuibyshevsky are treated in a countercurrent column extractor with phenol in a ratio of 1: 2.87, 10% of the extract is fed to the lower part of the extractor, and 2% by volume of the extract is taken from the extractor water is fed to the loaded phenol and sent to the tank from the steadfast, from where the recovered secondary raffinate phase in an amount of 30% by volume to the recovered raw material is returned to the main extractor in the zone between the points of input of the raw material and the extract. afinat a yield of 60.7% on the raw material and the viscosity index after dewaxing 93 points.

Example 2. A viscous distillate {fraction 37O-5OO ° C) from a mixture of oil (Romashkin and Kuibyshev) is treated with phenol in a ratio of 1: 2.05, 30ob.% Extract is fed to the lower part of the extractor, to the extract solution before the settling tank Serves 5 vol.% phenolic water. The separated secondary raffinate phase in the amount of 20 vol.% Per raw material being cleaned is returned to the zone of the extract solution of the main extractor. After distilling off the phenol, refining is obtained in the amount of 63.5% of damp with a viscosity index after dewaxing 94 points.

EXAMPLE 3 A viscous distillate from a mixture of oil {Romashkin and Kuybyshev) is treated with phenol in a ratio of 1: 1.75, 30 vol.% Of extract is supplied to the lower part of the extractor, 5 are fed into the extract solution before the settling tank. vol.% phenolic water. The separated secondary raffinate phase in the amount of 30 vol.% Per raw material being cleaned is returned to the zone of the extract solution. After raffinate is obtained from the race of phenol in the amount of 71% of the raw material with a viscosity index of 84 points.

Comparative data of industrial and experimental tests of the proposed and known methods are given in the table.

As can be seen from the table, the proposed method in comparison with the known improves the quality of the raffinate and its output.

The proposed method increases the clarity of separation of the oil fractions into raffinate and extract, which allows either to improve the quality of the raffinate while maintaining its yield to the raw material, or with the same quality, to increase the yield. 60,763,5 93

Coefficient of refraction

neither ft

Experimental data Output on the feedstock,%

Viscosity Index after dewaxing

Refractive index neither

Claims (2)

1. The method of purification of oil fractions jj by treating them with phenol to obtain raffinate and extract solutions in the corresponding zones with feeding the secondary raffinate phase to the zone of the extract solution and subsequent regeneration to phenol to obtain raffinTa and extract, characterized in that In order to improve the quality and increase the yield of oil fractions, 10-45-50% by volume of the extract are additionally fed to the zone of the extract solution. 4546.8 9292 94 1.4790 1.4732 1.4780 1.4694 71 68.7, 84 84 1.4795 1.4770 2. The method according to p. 1, about tl and h and y and with the fact that the secondary raffinate phase is served in an amount of 5-30% by volume to the purified fractions. Sources of information taken into account in the examination 1. Brazhnikov V.T. Modern installations for the production of lubricating oils. 1959, p. 117-149. 2.Goldberg D.O. Lubricating oils from the oils of eastern deposits. M., 1972, p. 88-89 (prototype).