The method of preparation of raw material for catalytic cracking and hydrocracking

 

The invention relates to the refining industry and can be used when cleaning the raw material for hydrocracking and catalytic cracking from polycyclic aromatic hydrocarbons, heteroatomic compounds and heavy metals. The method involves solvent extraction of impurities from the vacuum gas oil (feedstock cracking processes) two immiscible solvents - polar N-organic or dimethylacetamide containing 3 wt.% water at a temperature of 30-50oWith and nonpolar pentane or heptane at a mass ratio of non-polar solvent: the raw material is 0.5-1:1. The method improves the selectivity of the process and reduces the loss of solvent from the extract phase. 3 table.

The invention relates to the refining industry and can be used when cleaning the raw material for hydrocracking and catalytic cracking from polycyclic aromatic hydrocarbons, heteroatomic compounds and heavy metals.

Raw material processes, hydrocracking and catalytic cracking are vacuum gas oils, which imposed strict requirements on the content of politicalarena the economic indicators of the cracking processes leads to increased coxworthy, rapid deactivation of the catalysts decrease the degree of the conversion of raw materials and output of gasoline fractions, low quality fuels [Ind. Eng. Chem. Res. 1998. V. 37. N 12. R. 4637-4640].

Known methods for cleaning vacuum gas oil in order to obtain lubricating oils, operational properties are also reduced with increased content of polycyclic aromatic hydrocarbons and heteroatomic compounds, liquid extraction using selective solvent is furfural, phenol, N-methylpyrrolidone, dimethylformamide, dimethylacetamide, etc. [Kazakov L. P., crane, S. E. Physico-chemical basis for the production of oil. M.: Chemistry, 1978. - 320 S.]. Closest to the technical essence and the achieved effect of the method of cleaning oil oil fractions N-organic.

The main drawback of these methods is not sufficiently selective removal of undesirable components in the processes of selective treatment with the extract lost up to 20 wt.% saturated hydrocarbons contained in the raw materials.

To improve the selectivity of the process of removing unwanted components from the vacuum gas oil is proposed to carry out the extraction with two solvents, polar and nonpolar, being the containing 3-5 wt. % of water, and as nonpolar - pentane or heptane containing 1 wt. % toluene. The last mixture simulates the composition of the raffinate with the installation of extraction of benzene and toluene from catalization reforming.

In table. 1 shows the characteristic of vacuum gasoil, which is the raw material for catalytic cracking and hydrocracking, obtained with the installation of the primary distillation of crude oil AVT-6 "Kirishinefteorgsintez".

Selective cleaning of vacuum gas oil was carried out countercurrent extraction with N-organic and dimethylacetamide in the presence of nonpolar solvents (pentane and heptane) under the conditions shown in table. 2.

The results of the extraction cleaning vacuum gasoil prototype and the proposed method are given in table. 3: example 1 - the prototype (N-organic, without the use of a non-polar solvent), example 2 - the proposed method (N-organic preemptive and non-polar solvent pentane), example 3 - the proposed method (with dimethylacetamide preemptive and non-polar solvent heptane containing 1 wt.% toluene).

As follows from the data given in table. 3, the use of pentane or heptane as leaching nonpolar dissolve Ira, leads to decrease their losses from the extract phase. So, when similar concentrations of aromatic hydrocarbons in the raffinate (experiments 1 and 3) loss of saturated hydrocarbons from the extract phase is reduced more than 3 times - from 19.6 wt.% (without pentane, the prototype) to 6.2 wt.% the number of these valuable components (for subsequent processes hydrocracking or catalytic cracking) in raw materials.

The extract obtained with the use of extraction systems N-organic - pentane, characterized by a higher content of aromatic compounds, as evidenced by increased values of the content sulfurylase and factor aromaticity than one extraction solvent N-organic without pentane (cf. examples 1 and table 2. 3).

Adding washing nonpolar solvent is reduced and the content in the raffinate gray - and nitrogen-containing compounds, and heavy metals. The sulphur content in the raw material is reduced from 1.38 wt.% to 0.57-0.76 per cent for the proposed method (the prototype to 0.97%); nitrogen - from 0.24% to 0.10-0,09% (on prototype to 0.16%).

The proposed method can more fully be removed from the raffinate feedstock for catalytic cracking and hydrocracking of heavy metal compounds: the degree ingelesa - 68,6 and 71.4% (prototype - 56,2).

Thus, the introduction of non-polar wash solvent (pentane or heptane) increases the selectivity cleaning vacuum gasoil from unwanted components.

The extract can be used as a plasticizer in rubber mixtures and polymer compositions, in particular, as a plasticizer oil MO-S (macromarketing for tire rubbers).

Example 1 (prototype).

In the lower part of the Packed extraction columns efficiency 5 theoretical stages is served at the 30oWith the vacuum gas oil (consumption of 100 g/h), and in the upper part of N-organic with 5 wt.% water (flow rate of 500 g/h). In the countercurrent extraction after stable mode are selected at the same time the raffinate and extract phases.

From rafinate phase N-organic washed with water, hydrocarbon fraction (raffinate) is analyzed. Received 58,0 g of raffinate containing a 27.4 wt. % of aromatic hydrocarbons, which can be used as high-quality raw material for catalytic cracking and hydrocracking. The extract phase is fed to the regeneration of N-methylpyrrolidone vacuum distillation. VAT residue vacuum columns (extract) washed vodadone extraction column efficiency 5 theoretical stages is served at the 30oWith the vacuum gas oil (consumption of 100 g/h) and pentane (100 g/h), and in the upper part of N-organic with 3 wt.% water (flow rate of 500 g/h). In the countercurrent extraction after stable mode are selected at the same time the raffinate and extract phases.

From rafinate phase to a distillation column (20 theory. plates) Argonauts pentane, then under vacuum, N-organic. VAT residue - hydrocarbon fraction (raffinate) is washed with water and analyzed. Obtained 60 g of raffinate containing and 22.6 wt.% aromatic hydrocarbons which can be used as high-quality raw material for catalytic cracking and hydrocracking.

From the extract phase is distilled pentane, then under vacuum, N-organic. VAT residue (40g) contains 85,1% sulfurylase and can be used as a plasticizer for rubber and polymer compositions.

Example 3.

In the lower part of the Packed extraction columns efficiency 5 theoretical stages is served at the 30oWith the vacuum gas oil (consumption of 100 g/h) and heptane containing 1 wt.% toluene (100 g/h), and in the upper part - dimethylacetamide with 3 wt.% water (flow rate of 500 g/h). In the countercurrent extraction after reaching the stable is alone (20 theory. plates) Argonauts heptane, then under vacuum dimethylacetamide. VAT residue - hydrocarbon fraction (raffinate) is washed with water and analyzed. Received to 67.3 g of the raffinate, containing 27.0 wt.% aromatic hydrocarbons which can be used as high-quality raw material for catalytic cracking and hydrocracking.

From the extract phase is distilled pentane, then under vacuum dimethylacetamide. VAT residue (32,7 g) contains 90.1% of sulfurylase and can be used as a plasticizer for rubber and polymer compositions.

Claims

The method of preparation of raw material for catalytic cracking and hydrocracking by solvent extraction of aromatic hydrocarbons, heteroatomic compounds and heavy metals from the vacuum gasoil N-organic or dimethylacetamide containing 3 wt.% water at a temperature of 30-50o, Characterized in that the extraction is carried out in the presence of nonpolar leaching solvent is pentane or heptane at a mass ratio of non-polar solvent : raw 0,5=1:1.

 

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1 dwg, 4 tbl, 4 ex

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11 tbl, 6 ex

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2 cl, 4 ex, 2 tbl

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1 tbl, 2 ex

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1 tbl, 6 ex

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3 cl, 1 tbl, 15 ex

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8 cl, 8 dwg, 7 tbl, 6 ex

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1 tbl, 2 ex

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2 tbl, 1 ex

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1 tbl, 2 ex

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