SU1162853A1 - Method of refining petroleum and petroleum products - Google Patents

Abstract

A METHOD FOR CLEANING OIL AND PETROLEUM PRODUCTS from heteroatomic products by splicing the latter with titanium tetrachloride followed by separation of the complex, characterized in that, in order to increase the degree of purification, it is reduced to shr after the complex formation by 20-30 times. .

Description

  . The invention relates to a method for refining petroleum and petroleum products from heteroatomic compounds (GUS), and can be used in the refining and petrochemical industries. Removal of gas from petroleum and petroleum products will improve the quality of petroleum products, improve the service life and performance of catalysts for oil refining and petrochemistry. A known method of purification of petroleum products from nitrogenous and asphalt-resinous components by complexing the latter with titanium tetrachloride (TXT) in a propylene carbonate medium, followed by separating the propylene carbonate and isolating the lj complex from it. However, this purification method is applicable only to distillation fractions boiling above 300 ° C. In the case of oil refining, the separation of the phases (propylene carbonate feedstock) either does not occur at all or takes a lot of time. The disadvantages of the method are also incomplete extraction of the gas and low degree of purification from sulfur components. In addition, useful components can be extracted into the propylene carbonate phase. The disadvantages of the method include the difficulty of cleaning the raw material from traces of propylene carbonate and the complexity and power consumption of the process of separating complexes of heteroatomic compounds from propylene carbonate. A known method of purification of oils and petroleum products from nitrogenous compounds (AS) and astphalt-resinous substances (ASMV) with a single treatment with titanium tetrachloride followed by separation of the insoluble complexes by filtration or centrifugation 2. The disadvantage of the known method is the incomplete purification of nitrogenous and resinous compounds. The purpose of the invention is to improve the degree of purification of petroleum and petroleum products. The objective is achieved by the method of refining petroleum and petroleum products from heteroatomic products by complexing the latter with titanium tetrachloride, followed by separating the complex, which means that 32 are diluted before or after the complex formation 32 -30-fold excess of aliphatic hydrocarbon. The method is carried out in two versions as follows. 1st option. A portion of the oil or petroleum product is treated with TXT. The separated, insoluble complex. X is separated. Soluble TXT and HAS complexes are diluted with a 20-30 fold excess of pentane, and precipitated, which is also separated. The amount of TXT is determined by the GAS content. 2nd option. A portion of the oil or petroleum product is diluted with a 20-30 fold excess of pentane. The TXT is dosed and the precipitated precipitate is separated (by filtration, centrifugation or decanting). In the first embodiment, two GAS concentrates are obtained, differing in properties and able to find different uses. The second is characterized by the possibility of combining it with the deasphalting process, i.e. opportunity to do without additional energy costs. The purification is carried out at a temperature below the boiling point of the diluent, in pentane at room temperature. The complex is decomposed with water or an aqueous solution. alkali. GUS forms a separate phase. TXT in the form of titanium dioxide can be used as an independent product or sent for regeneration to TXT. Pentane is separated from the raffinate by distillation and can be used multiple times in a cleaning cycle. Example 1. The CCbOg fraction above Samotlor oil was added 10 g of TXT. The mixture is stirred for 10 minutes, the precipitate 1 is separated by centrifugation. The weight of the precipitate is 1-7.9 g. The raffinate is diluted with a 30-fold amount of pentane (1800 ml). After standing for an hour, the precipitate was filtered off. Draft weight 19.4 g. After distillation of pentane, the raffinate does not contain nitrogen. The content in the concentrate isolated from the sediment .1, sulfur 1.80%, nitrogen 1.12%, from sediment 2 - sulfur 2.22%, nitrogen 0.54%. Example 2. 60 g fraction of the highest 400 Samotlor oil with nitrogen content of 0, J2%, sulfur 1.40%

3

diluted with 30 times the amount of pentane (1800 ml). 10 g of TX are metered in. The mixture is stirred for 20 minutes, the precipitate is separated by filtration. The raffinate after separation of pentane contains 0.72% sulfur. Nitrogen is not.

Example 3.45g of oil {Soviet deposit) with a nitrogen content of 0.35%, sulfur 1.1%, silica gel resins 6%, asphaltenes 2.0% diluted with a 20-fold amount of pentane (900 ml), 5 g of TXT are metered, After settling the precipitate is filtered, the raffinate does not contain nitrogen, tar, asphaltenes, sulfur 0.47%.

Example D. To dissolved in 30-fold excess of pentane (900 ml) sample -30 g VAC. gas oil 340-490 0 Angarsk NHC with a nitrogen content. 0.14%, sulfur 1.5%, resins 3.2%, asphaltenes 0.3% at room temperature, 2.5 g of TXT are added. After settling, the precipitate is filtered off. No tar, nitrogen, asphaltenes are detected in the raffinate. Sulfur content reduced to 0.68%

The comparative characteristics of the raffinates according to the proposed and known methods before and after purification are given in table. one .

The required dilution to achieve the maximum depth of refining depends on the group chemical composition of the oil or oil product.

628534

Determination of the degree of dilution is shown in Example 1. After dosing TXT, the weight of the separated precipitate is 17.9 g. On addition of 5,600 ml (10-fold excess), 1.2 g of precipitate is additionally released. Adding another 600 ml (20-fold excess) of pentane releases 12.4 g of precipitate of the complex. The next portion of 600 ml of pentane gives an additional 5.8 g of precipitate. Further addition of the solvent does not result in the separation of the complexes.

The data are summarized in table. 2,

From tab. 2, it follows that a dilution of 10 times does not cause a noticeable increase in the degree of excretion. At multiples above 10, the degree of excretion increases and reaches a maximum at a 20-30 to 30-fold excess, depending on the starting product. A further increase in dilution does not increase the cleaning efficiency.

Thus, the proposed method allows for a more complete purification of petroleum oil from gas. The advantage of the proposed method is the quantitative isolation of AS and an increase in the degree of purification from sulfur compounds. The latter will have a positive effect on the quality of petroleum products, will make it possible to lower the catalytic surface processes and reduce emissions of sulfur and nitrogen oxides into the atmosphere.

Table 1

0.12

one

No 0.12

2 3 4 0.35 0.14 0.19

P, 006 famous

0, .70 0.72 0.47

6.0 No 2.0 No 3.2 0.3, 68 6.0, 0.8 1.0 0.60

T a b l and d a 2

Claims (1)

METHOD FOR CLEANING OIL AND OIL PRODUCTS from heteroatomic products by complexing the latter with titanium tetrachloride followed by separation of the complex, characterized in that, in order to increase the degree of purification, the feedstock is diluted with an excess of aliphatic hydrocarbon 20-30 times by volume in order to increase the degree of purification.