SU977476A1 - Process for purifying petroleum oil cuts - Google Patents

Description

This invention relates to refining and relates to a method for purifying oil fractions with selective solvents.

A known method of purification of oil fractions of oil by extraction with furfural.

However, the low selectivity of the indicated solvent does not ensure sufficient recovery of the desired components from the oil feedstock, the selection does not exceed 90% of the potential content of the desired components in the feedstock.

Closer to the proposed method in essence and the achieved result is the method of purification of oil fractions of oil by extraction with dimethylacetamide 2.

However, dimethylacetamide, which has a higher selectivity when cleaning oil fractions compared to phenol and furfural, has a density close to the density of the processed fractions, which adversely affects the hydrodynamic and thermodynamic mode of extraction, reduces the phase separation rate I and the mass transfer intensity. ,

The purpose of the invention is to increase

yield and improving the quality of purification of oil fractions.

The goal is achieved by the fact that according to the method of purification of oil fractions of oil by extraction with dimethylethamide, the extraction is carried out in the presence of a mono- or di- or tri-amide amine containing

ten

  SbNu -. or

radicals or alkyl C. - Cg, taken in an amount of 0.5-2 wt% for raw materials.

Substituted amines with surface-active properties, gs15 sorbiruyutsya on the interface, increase the rate of ascent of droplets from the splitting (extract) phase to the dispersed (raffinate) phase and increase the coalescence of drops in

20 settling sections of the extraction column.

The oil feedstock — vacuum distillates or asphalt-free oil — are fed to the bottom of the extraction column,

25 and dimethylacetamide - counter to its upper part.

Surface-active additives, substituted amines - are introduced into the zone of the extract solution below the level of section 30, la phase.

A refining solution containing 78-88% of the raffinate and 12-24% of solvent is withdrawn from the top of the extraction column, an extract solution containing 11-25% of the extract and 75-89% of solvent from the bottom of the column and directs to regeneration.

Example 1. A feedstock is an oily distillate from a mixture of West Siberian oils, boiling away in the previous stage. lah 350 - 490С, following quality:

Viscosity at cSt8.4

Density with, g / cm3 0,915

Sulfur content, wt.% 1.58

purified with dimethylacetamide at a ratio of solvent and raw materials of 1.5: 1 in the presence of triethylamine. The resulting raffinates are sent for dewaxing. The quality of the oils with a different amount of triethylamine is shown in Table. one.

Table 1

The quality of the raffinate: the refractive index at

Example 2. A raw material is an oil distillate from a mixture of West Siberian oils, boiling out of 330, of the following quality:

Viscosity at, cSt 4.8

Density at

, 888

Sulfur content

wt.% 1,3

The quality of the raffinate:

refractive index at 500s

1.4711

1.4709

1.4708

process in a countercurrent packed column with dimethylacetamide at a ratio of solvent and raw materials of 1.3: 1. Butylamine is fed into the column above the raw material input. The resulting raffinate is directed to dewaxing. In tab. 2 shows the quality indicators of the obtained raffinate and mas with a different amount of surfactant additive.

Table 2

1.4688

1,4692

1.4690

The quality of the raffinate:

refractive index at

The results show that it is SO that the input of surface-active additives in the extraction of oil distillates and deasphaltic acid by dimethylacetamide allows obtaining a Maola by selective cleaning of a sufficiently high level of output quality.

Continued table. 2

1.4816

1.4812

1.4808

In tab. Figure 4 shows the comparative data on the quality of oils obtained during the purification of distillates and residual feedstock with solvents (phenol, dimethyl aceticide (DMMA) and dimethylacetamide) in the presence of a surfactant additive (PAD) (triethanolamine.

Id

t3

s

R 0

"

Claims (2)

H 9 Data table. 4 show that carrying out the purification process in the presence of substituted amines, for example, triethanolamine, allows a significant increase in the yield of purified oil (by 3.2–4.2%) while improving the viscosity index of the resulting oil by 3–4 points, by 12–20 % reduce solvent consumption and ensures the production of high-quality oils from any type of crude oil - distillate and residual. DETAILED DESCRIPTION OF THE INVENTION The method of purification of oil fractions of oil by extracting dimethyl acetate 7610 with tamide, characterized in that, in order to increase the yield and improve the quality of purification of oil fractions, extraction is carried out in the presence of a mono- or di-, or tri-substituted amine containing C2. - C, in amount of 0.5 - 3 wt.% For raw materials, .. Sources of information taken into account during the examination 1. Kazakova L.P., Krein S.E. Physico-chemical basis for the production of petroleum oils. M., Himi, 1978, p.90. 2. Japan patent number 3fl44, cl. 18 D 5, publ. 1971 (prototype).