Method of deasphalting tar

FIELD: chemistry; oil refinery industry.

SUBSTANCE: tar is mixed with a light hydrocarbon solvent in a mixture. After mixing, the tar and the solvent are passed through homogeniser, consisting of a distributor plate with 7 to 11 openings each with diameter of 20-30 mm, and are then extracted in the extractor. Asphalt solutions and asphalt-free oil are obtained, with subsequent recovery of the solvent from the solutions and its return for mixing with tar.

EFFECT: increased asphalt-free oil output.

1 dwg, 2 ex

 

The invention relates to a method of deasphalting tar (heavy petroleum residues vacuum distillation of fuel oil) propane to obtain the components of the residual base oils and can be used in the oil industry.

Known ["Pocket guide the oil refiner". Edited Meglumine and other M: Tsniiteneftehim, 2004, p.185-188] the method of deasphalting by filing in the middle part of the extractor, in the lower part of which is propane, with the formation of solutions of the vacuum residue and asphalt and the next stage of the regeneration solvent to obtain asphalt-free oil and asphalt.

The disadvantages of this method are not a high yield of vacuum residue and high power consumption when it is received.

Known methods for deasphalting oil residues [A.S. USSR №1281586, CL 10G 21/14, 1987, RF patent №2089591, CL 6 10G 21/1, 1995] by mixing tar and propane out of the extractor and feed mixture in the extractor.

The disadvantages of the known methods is insufficient mixing tar with propane before serving, mix in the extractor.

Known methods for deasphalting oil residues (Goldberg D.O., crane CE Lubricating oil from the Eastern oil fields, M.: Chemistry, 1972, p.64), according to which the efficiency of the process for deasphalting DOS is ikaetsya by increasing the surface of contact between the phases due to the presence in the extractor for deasphalting plates of various designs.

The disadvantages of these known methods include the following process: admission to the extractor raw mix inhomogeneous texture consisting of large drops of tar, which reduces the overall size of the mass, has a high deposition rate. These factors not only reduce the selection of asphalt-free, but also contribute to the formation of deposits on the inner devices of the extractors.

Closest to the invention is a method of deasphalting [Oil and gas technologies, 2003, №2, s], according to which the residual raw materials (e.g., tar), mixed at elevated temperature and pressure in the mixer with a hydrocarbon solvent (from propane to hexane), enters the extractor (separator asphaltenes). In it, the solvent is fed countercurrent raw materials, extracts from the last lighter components with obtaining a solution of the vacuum residue. From the bottom of the extractor deduce the solution of asphalt. After regeneration of the solvent from solutions of its return pump for mixing with the residual raw materials.

The disadvantages of the method adopted for the prototype, is the low output of the vacuum residue due to insufficient mixing tar with propane before serving, mix in the extractor and directly in the extractor due to the high viscosity raw material.

The aim of the invention is the increase in the output of the vacuum residue.

This goal is achieved by a method of deasphalting, according to which the tar is mixed with a light hydrocarbon solvent in the mixer. The mixture of tar with solvent after the mixer passes through the homogenizer containing the distribution plate 7-11 holes with a diameter of 20-30 mm each, where at a temperature 118-128°and the pressure of 3.6-4.5 MPa is formed of a homogeneous particulate phase.

Gomogenizirovannogo the mixture is fed to the extractor for the extraction of obtaining solutions of asphalt and asphalt-free oil, the subsequent regeneration of the solvent from solutions and return on mixing with tar.

A distinctive feature of the proposed method compared with the method adopted for the prototype is the passage obtained in the mixer a mixture of tar with solvent through the homogenizer containing the distribution plate 7-11 holes with a diameter of 20-30 mm each, where at a temperature 118-128°and the pressure of 3.6-4.5 MPa is formed of a homogeneous particulate phase.

Thus, the claimed method meets the criteria of the invention of "novelty."

The method is as follows. Raw tar with a temperature of at least 130°direct into the mixer where it is mixed with a hydrocarbon solvent (usually propane)having a temperature no higher than 46&x000B0; With in a volume ratio of 1.5-2.5:1. The quantity of propane fed to the mixer, shall not exceed 5-10% vol. of the total volume of propane fed to the extractor, so as not to burden settling zone extractors

After the mixer, the mixture of tar propane temperature 118-128°and a pressure of 3.6-4.5 MPa passes through the homogenizer containing the distribution plate 7-11 holes with a diameter of 20-30 mm each (see drawing). The resulting homogeneous particulate phase after cooling in air refrigerator to a temperature of not higher than 100°served on the top of the extractor. In the bottom of the extractor serves the main volume of propane (90-95%).

Asphalt destroying tar liquid propane flows at a pressure of 3.6-4.0 MPa, a temperature of the top 65-80°C, bottom 50-70°C, ratio of propane: raw 5-6:1,0 (vol.). As a result of deasphalting in the contactor formed of two layers: the top layer is a solution of the vacuum residue, the bottom layer is a solution of asphalt. The solution of the asphalt from the bottom of the contactor and the solution of the vacuum residue from the top of the contactor are directed to the regeneration unit propane, whence derive the asphalt-free oil, asphalt and recycled propane. Last recycle mixing with tar.

Analysis of the known technical solutions on how to deasphalting oil residues leads to the conclusion about the absence of these symptoms that are similar to the substantial distinctive features of the claimed method, that is, the compliance of the proposed method to the requirements of inventive step.

The advantages of the proposed method is shown in the following examples.

Example 1

Raw tar with the cube of the column vacuum distillation of the mixture Eastern oil (viscosity at 80°73 sec up to 500°boils 9%) with a temperature of 150°direct into the mixer where it is mixed with propane, having a temperature of 45°With, in a volume ratio of 2.0:1. The quantity of propane fed to the mixer is 10 vol.% of the total volume of propane fed to the extractor.

After the mixer, the mixture of tar with propane with a temperature of 120°and a pressure of 4.0 MPa passes through the homogenizer containing the distribution plate 7 holes with a diameter of 25 mm each. The resulting homogeneous particulate phase after cooling in air refrigerator to a temperature of 90°served on the top of the extractor. In the bottom of the extractor serves the main volume of propane (90 vol%).

Asphalt destroying tar liquid propane flows into the extractor at a pressure of 4.0 MPa, a temperature of the top 79°C, bottom 69°C, ratio of propane: raw materials 6:1 (by vol.). As a result of deasphalting in the extractor are formed two layers: the top layer is a solution of the vacuum residue, the bottom layer is a solution of asphalt. The solution of the asphalt from the bottom of the extractor and the solution DEAS is altitute from the top of the extractor are directed to the regeneration unit propane, where evacuate the vacuum residue (yield of 28.3 wt.% on tar, cocking behavior 0.84 wt.%), asphalt and recycled propane. Last recycle mixing with tar.

Example 2 (prototype)

The asphalt destroying tar is carried out in the conditions of example 1 except that after the mixer is missing homogenizer. The output of vacuum residue with cocking behavior of 0.91 wt.% 24.6 wt.% on the tar.

Holding the deasphalting according to the proposed method allows to increase the selection of vacuum residue with 24,6 to 28.3 wt.% (15 Rel.%). Benefits due to the fact that in the absence of a homogenizer in the extractor receives raw mixture heterogeneous texture consisting of large drops of tar, i.e. the total area of mass transfer is low. Large drops of tar have a higher deposition rate, which resulted in a reduction of the selection of the asphalt-free due to the deterioration process of mass transfer and the formation of deposits on the internal devices of the extractors. When working with a homogenizer located after the mixer, extractor comes particulate phase, the area of mass transfer increases and increase the selection.

The presence of a homogenizer after the mixer also allows you to reduce the viscosity of the cooled mixture due to its uniformity and to increase the coefficient telomere the ACI air refrigerator, that gives the possibility to increase the load installed on the pavement. This also increases the efficiency of interaction of propane with the tar out of the extractor and as a result, the process of deasphalting liquid propane in the extractors intensified.

The method of deasphalting by mixing it with a light hydrocarbon solvent in the mixer, the extraction in the extractor to obtain solutions of asphalt and asphalt-free oil, the subsequent regeneration of the solvent from solutions and return on mixing with tar, characterized in that the mixture of tar with solvent after the mixer passes through the homogenizer containing the distribution plate 7-11 holes with a diameter of 20-30 mm each.



 

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