SU1089105A1 - Process for purifying petroleum and its products - Google Patents

Abstract

A METHOD FOR CLEANING OIL AND PETROLEUM PRODUCTS from heteroatomic compounds by complexing the latter with titanium tetrachloride with the subsequent separation of the raffinate, o t and h ay. u “and so that, in order to increase the degree of purification ,. the raffinate is additionally treated with triethylamins at a molar ratio of it with titanium tetrachloride para 1:

Description

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The invention relates to a method of refining oil and petroleum products from heteroatomic compounds (GAS) and can be used in the refining and petrochemical industry. Removal of GAS from oil and its refining product will eliminate a number of technological processes for the additional purification of petroleum feedstock, improve the quality of petroleum products, to increase the service life and performance of catalysts for oil refining and petrochemistry. Known to clean the oil of raw materials from nitrogenous compounds (AS) of asphalt-resinous substances (ASMV) by a single treatment of petroleum and petroleum products from petroleum products by titanium (in pure form or in a solution of hydrocarbons), followed by separation of insoluble complexes by filtration or centrifugation with ClJ. Closest to the proposed by the technical essence method of cleaning oil products from AU and ASMV by complexing the latter with titanium tetrachloride (TXT) in propylene carbonate medium followed by J Separating the complex and separating the G2 raffinate}. However, the known purification method is applicable only to distillation fractions, boiling above 300 C. In the case of oil, phase separation (raw material — propylene carbonate) either does not occur simultaneously, or requires a lot of time. The disadvantage of the method is also incomplete extraction of the AU and a low degree of purification from sulfur components. The purpose of the invention is an increase in the degree of purification of the crude oil from HAS (sulfur and nitrogen). The goal is achieved according to the method of purification of oil and petroleum products from heteroatomic compounds by complexing the latter with titanium tetrachloride and subsequent separation of the raffinate, the raffinate is additionally treated with triethylamine at a molar ratio of 1: (O, 5-2.0) . The method is carried out as follows. A portion of the oil or oil product is treated with TXT. The isolated non-soluble complex is separated by center 052 by fugging. The hydrocarbon-soluble TXT complexes with HAS, as well as the excess of the formaker, are added to the precipitate by addition of TEA, which is also separated by centrifugation. The amount of complexing agent is determined by the GAS content. The molar ratio of TXT TEA 1: (0.5-2.0). Cleaning is carried out in the temperature range of 20- (0 ° C, depending on the viscosity of the system. To reduce the viscosity, it is possible to pre-dilute the oil or oil product with hydrocarbons C. The complex is decomposed with water or an aqueous alkali solution. The HAS form a separate phase. can be used as a standalone product or sent for chlorination.The refined product is washed with TEA with water, after rectification, it can be used in the purification process. Example 1. To 103 g of oil with a nitrogen content of 0.15%, add 13 g of TXT at The mixture is stirred for 15 minutes, the precipitate is separated by centrifugation. 6 g of TEA is added to the centrate. The mixture is stirred again, the precipitate is separated. The raffinate is washed with water. It does not contain nitrogen. Example 2. To 100 g of oil with% content : nitrogen 0.33; sulfur 1.0; silica gel resins 7.0 and asphaltenes 1.7 added 10 / g TXT at room temperature.The mixture is stirred for 20 minutes, the precipitate is separated, to the raffinate 5 g of tea is added. The raffinate contains 0.01% nitrogen, 0, -5% sulfur, 0.2% tar, no asphaltenes. Example Z.K29g fraction 350-450 ° C with a nitrogen content of 0.15% and sulfur 1.30% added 2.6 g of the complexing agent. The mixture is stirred for 15 minutes at. The precipitate is separated by centrifugation and 1.3 g of tea are introduced into the centrate with stirring. The raffinate does not contain nitrogen, the sulfur content is reduced to 0.8%. Example 4. To 100 g of vacuum gas oil 340-490 with a content,% nitrogen 0.14; sulfur 1.5; silica gel resins 3.2 and asphaltenes 0.3% at 60 ° C. 6 g of complexing agent are added. After stirring and separating the precipitate, 3 g of TEA are added to the mixture. After cleaning, no tar, asphaltenes and nitrogen were found in the raffinate. Sulfur content reduced to 0.84%.

The dependence of the quality of purification on the ratio of TXT and TEA is shown in Table 1.

Characteristics of raw materials and refined are summarized in table 2.

A change in the molar ratio of components downward from the optimal effect on the completeness of separation of hetero compounds, and an increase in this ratio does not lead to an increase in the degree of purification. Thus, the proposed method of purification of oil and petroleum products from heteroatomic compounds can work at a ratio of 1: 0.5 - 1: 2, however, the optimal ratio of titanium tetrachloride and triethylamine is 1: 1.

Thus, the proposed method allows the purification of petroleum from GAS (nitrogenous, sulfur, tar-asphalt compounds). In contrast (E from the prototype of the proposed method, it is possible to purify not only distillate fractions, but also crude oils. The latter is of great importance for refining processes, since it allows

Comparative characteristics of the raffinates according to the proposed and known methods are missing. 0.040 The proposed 0.15 0.01 0.047 20.33 Lack 0.041 30.15 4 0.14 The same 0.033 Known 21 0.11 0.07 0.033 2 0.11 0.03 0.033

switch off many technological processes of additional purification and refining of crude oil. The advantage of this method is the quantitative separation of the AU and an increase in the degree of purification from sulfur compounds. The latter has a positive effect on the quality of petroleum products, since it reduces catalytic processing and reduces emissions of nitrogen and sulfur oxides into the atmosphere.

Table 1

1: 0.5 21.6 0.30 93.0 1.6 35.5 1: 1 21.8 0.30 94.0 1.9 44.0 1: 2 22.0 0.30 94.0 1.9 44.0

Table No-Same 1.00, 006 1, 50 1.25 0.003 1.50 1.19

Way

The proposed 1 - 2--7, 0

30.63 0.10

Known 2 1 2

Continued table. 2

0.21.7

whine

Out of 0.3

There is no vuit

1.1 0.25

Same ||

Out of 0.25

Claims (1)

METHOD FOR CLEANING OIL AND OIL PRODUCTS from heteroatomic compounds by complexing the latter with titanium tetrachloride followed by separation of the raffinate, ref. u 'I d from the fact that, in order to increase the degree of purification, _h trietilamintsm raffinate is further treated with a molar ratio of titanium tetrachloride with its different 1: (0.5-2.0). cl 1089 105 2