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.
ClaimsThe 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.
FIELD: petroleum processing.
SUBSTANCE: invention, in particular, relates to purification of vacuum gas oils, mazuts, and/or dewaxed products used further as feedstock for hydrocracking and catalytic cracking as well as high-quality fuel oils and marine oils. Purification contemplates removal of polycyclic aromatic hydrocarbons, heteroatomic compounds, resins, asphaltenes, and heavy metal compounds. Process consists in liquid extraction of undesired components with two mutually immiscible solvents: polar N-methylpyrrolidone with 3-5% water at 40-60°C and nonpolar n-undecane or undecane fraction forming azeotropic mixtures with N-methylpyrrolidone having minimal boiling temperature (about 179°C). Weight ratio of nonpolar solvent to raw material is (0.4-0.5):1.
EFFECT: increased selectivity of process in reduced risk of thermooxidative and hydrolytic decomposition of N-methylpyrrolidone as well as corrosion of equipment.
1 dwg, 4 tbl, 4 ex
FIELD: petroleum processing and petrochemistry.
SUBSTANCE: lube fractions are brought into contact with N-methylpyrrolidone in extraction tower according to three-step countercurrent purification scheme to form raffinate and extract solutions. When distillate fraction II (300-400°C) is purified, of sulfoxide is preliminarily added in amount of 0.1-0.5% based on the weight of solvent. Distillate fraction III (350-420°C) is then purified after addition to solvent of 0.5-1.5% of extract obtained from purification of distillate fraction II.
EFFECT: deepened purification of raffinate, increased yield of raffinate as commercial product, and enabled qualified application of extract by-product.
11 tbl, 6 ex
FIELD: oil and gas production.
SUBSTANCE: invention refers to procedure of clarification of oil distillate under effect of magnetic field consisting in clarification of oil distillate with N-methyl-pyrrolidone, also, oil distillate is subjected to effect of constant magnetic field with induction 0.05-0.25 tesla. Force lines of constant magnetic field are directed perpendicular to vector of flow of oil distillate, while linear rate of flow in an active gap of a magnetizator amounts to 0.01-03 m/sec, whereupon oil distillate is mixed with N-methyl-pyrrolidone.
EFFECT: improved quantitative and qualitative indices of finish product, reduced critical temperature of oil distillate dissolving in N-methyl-pyrrolidone and reduced temperature of extraction.
2 cl, 4 ex, 2 tbl
FIELD: oil-and-gas production.
SUBSTANCE: invention relates to method whereby initial hydrotreated diesel fraction is separated by rectification into light and heavy components. Heavy component is subjected to liquid extraction with subsequent regeneration of solvent from refined and extracted solutions and blending of obtained refined product with light component of diesel fraction. Note here that solvent in liquid extraction is N-methylpyrrolidone. Hydrotreated diesel fractions with final boiling point approximating to 300°C are used as light component. Hydrotreated diesel fractions with initial boiling point approximating to 260°C are used as heavy component. Weight ratio between hydrotreated diesel fraction heavy component and N-methylpyrrolidone varies from 1:0.5 to 1:2. Temperature in liquid extraction is kept varying from 40°C to 70°C.
EFFECT: better ecological properties.
1 tbl, 2 ex
FIELD: oil-and-gas production.
SUBSTANCE: invention relates to production of diesel fuel. Proposed method comprises oil desalting, extraction of diesel fractions, their mixing and mix hydrofining. In distillation in atmospheric column, two diesel fractions are run off that boil away at 171-341°C and 199-360°C, 199-360°C-fraction is directed to fluid extraction to remove benzalkylthiophens at the stock-to-extragent ratio of 1:1 to 1:4. Note that said extragent represents the product of interaction of organic amine with organic acid, that is amide. Thereafter, fractions 171-341°C and 199-360°C are mixed after purification in percentage composition of 70-85% and 15-30%, respectively. Note here that said mix at distillation by ASTM D-86 method features dry point of 360°C. Produced mix is subjected to hydrofining to get diesel fuel.
EFFECT: diesel fuel with sulfur content not exceeding 10 ppm.
1 tbl, 6 ex
FIELD: oil and gas industry.
SUBSTANCE: task is settled by extraction of nitrogen-containing compounds from hydrocarbon phase into ion fluid (process solution). Process solution represents ion fluid, for example, on the base of alkilimidazol cation and tetrafluoroborate anion or chloride, that contains diluted compounds of transition metals selected from the group including complexes of cobalt (II) and cuprum (I) with 4,5- dicarboxyphtalocianin. Method includes further separation of hydrocarbon fracture from ion fluid and electrochemical regeneration of ion fluid. Ion fluid regeneration is done by electrochemical oxidation of nitrogen-containing compounds.
EFFECT: improvement of hydrocarbon raw materials quality.
3 cl, 1 tbl, 15 ex
FIELD: oil and gas industry.
SUBSTANCE: invention refers to diesel fuel denitration. The invention is related to the method of diesel fuel denitration which includes contact of diesel fuel containing one or several nitrogen-containing compounds with acid ionic liquid at mass ration of diesel fuel and acid ionic liquid equal from 1:0.2 up to 1:2 in at least one extraction zone for selective removal of nitrogenous compounds and production of effluent of denitrated diesel fuel that contains denitrated diesel fuel and acid ionic liquid with nitrogen-containing molecules and extraction of denitrated diesel fuel from effluent of denitrated diesel fuel; at that acid ionic liquid is hydrosulphate butyl methyl imidazoline (BMIMHSO4) or methyl sulphate butyl methyl imidazoline (BMIMCH3SO4).
EFFECT: production of the product with low content of nitrogen.
8 cl, 8 dwg, 7 tbl, 6 ex
FIELD: oil and gas industry.
SUBSTANCE: invention relates to the method of treatment of light hydrocarbon fractions containing sulphureous compounds and carbon dioxide, by means of contact in a counterflow absorber within a single stage with a circulating modified aqueous solution of alkanolamine regenerated to preserve a modifying additive by means of temperature desorption of carbon dioxide and sulphureous compounds. The modifying additive is sodium hydroxide in the amount of 0.005-1%, which after regeneration together with the absorbent is returned into the process. Absorbent supply into the absorber column is carried out by two flows into the upper and medium part of the column, the flow of saturated absorbent is discharged accordingly from the medium and the lower part of the absorber, flows are combined and sent for regeneration into a desorber.
EFFECT: high extent of treatment from carbon dioxide, hydrogen sulfide and other sulphureous compounds.
1 tbl, 2 ex
SUBSTANCE: invention is related to oil refining processes, in particular, to production of pollution-free diesel fuel. Invention is referred to the method including division of source straight run diesel into light (fr. 150-315°C) and heavy (fr. 315-360°C) components with further oxidation of the heavy component by 30% water solution of hydrogen peroxide in presence of acetone as catalyst at temperature of 90°C, time of oxidation is 20 minutes and at intensive mixing and extracting oxidation products after water separation by N-methylpyrrolidone with receipt of extraction and raffinate solutions with further regeneration of N-methylpyrrolidone from the above solutions with obtainment of refined oil and its compounding with light component of straight run diesel. The received compound is subjected to hydrofining with production of hydrogenation product being pollution-free diesel fuel.
EFFECT: fuels complying with requirements of Euro-4 and Euro-5 standards with low content of sulphur and polycyclic aromatic hydrocarbons.
2 tbl, 1 ex
SUBSTANCE: invention relates to a method of dearomatising a gasoline fraction - pyrolysis material, which involves extraction of aromatic hydrocarbons from a gasoline fraction at 62-180°C, obtaining a raffinate with low content of aromatic hyrocarbons, wherein the selective solvent used is a mixture containing 50-65 wt % N-methylpyrrolidone, 30-45% triethylene glycol, 3-7 wt % water.
EFFECT: low content of aromatic hydrocarbons in the gasoline fraction.
1 tbl, 2 ex