The composition of the solvent for the separation of petroleum products
(57) Abstract:The solvent for the separation of oil contains acetone 50; isopropyl alcohol 40; stable nitroxyl radical 0,02 1,0; water, to 100. 3 table. The invention relates to the refining and petrochemical industries, in particular solvents for the separation of hydrocarbon fractions by chemical composition.With the development of catalytic cracking in the fuel balance of the country, an increasing share of the secondary middle distillates. Due to poor chemical composition they are typically used as components of the furnace, marine and gas turbine fuels, which is not economically advisable.The aim of the invention is to increase the output dearomatizing product obtained by extraction of the light gas oil catalytic cracking (LGCC) solvent for use as a high quality component of diesel fuel, improve the physical and chemical properties of the latter.There are various formulations of solvents for the separation of petroleum products, for example on the basis of heterocyclic compounds [1, 2] lanproton [3, 4]
However, these solvents are not ISI regeneration of the solvent, the limited resource base, high cost.Also known composition of the solvent used for the separation of petroleum fractions  consisting of flooded acetone (70-99% acetone and 30-1% water). A significant drawback is the high mutual solubility with any (chemical composition) hydrocarbons (PL. 1). As raw materials when testing the optimal modes always used a model blend consisting of 70% -methylnaphthalene and 30% tridecane.The closest to the technical essence and the achieved result is the composition of the solvent  containing the wt. Acetone Water 5.60 5.20 2-Propanol Else
The solvent is readily available, inexpensive, allowing to carry out the extraction at low temperature.However, the resulting outputs of the raffinate and the quality is poor even at high multiplicity of the solvent, and to simultaneously achieve a sufficiently deep dearomatization and large output of raffinate impossible (PL. 2).The elimination of the negative sides of this solvent is possible by modifying the properties of the extractant.Proposed composition of the solvent, wt. Acetone 50, 2-Propanol 40,
Stable nitro - silny radical of 0.02.1, Vodki to the mixture watered acetone propanol.As can be seen from the data (table. 3), the addition of stable nitroxyl radicals to the mixture watered acetone from 2-propanol increases the yield of raffinate, depending on the ratio of solvent to 15.45% allowing simultaneously selected outputs of the raffinate and its quality.The use of stable nitroxyl radicals is limited to 1 wt. because of this low number does not change the physical nature of the solvent and allows the use of existing technological scheme and the existing installation of extraction.The solvent is circulated in the system together with the radical, as the complexing ability of the latter with the greatest polar solvents  and the radicals have the ability to improve the acceptor properties of the extractant.Used nitroxyl radicals: 2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl (P-1) and of 188.8.131.52-tetramethyl-4-phenyl-3 - imidazolin-1-oxide (P-2). Their physicochemical properties are shown below.Nitroxyl radical 2,2,6,6-tetramer-4-oxopiperidin-1-oxyl (designation (text) R-1): Mol.m. 172 Temperature plale deposits,aboutWith 70.5 solubility in water, 10-2< / BR>The hyperfine constant taimedislim-1-oxyl, (P-2) Mol.m. 217 Temperature plale deposits,aboutWith 80 solubility in water, 210-3< / BR>The hyperfine interaction constant, e 1,460,29
As raw materials, modeling kerosene-gas oil fraction, was used a mixture of methylnaphthalene and tridecan in the ratio of 7:3. The ratio of solvent to raw materials (100:150:390) by mass.The extraction was carried out by the analytical method in the apparatus of the mixer-settler, imitating one theoretical stage of extraction at 25aboutC. the Resulting two-phase system thermostatically using L-8H with accuracy of 0.2aboutC. removing the solvent phase was carried out by washing with distilled water. Mixing time phases 10 min, defending the 1 o'clock conditions of the extraction, the yield of raffinate and its quality are given in table. 3.Changes in the concentration of radicals R-1 and R-2 is several orders of magnitude (from 10-2up to 1% ) increases the yield of raffinate at 15-45% and the structure introduced into the extractant radical practically no effect on the yield of raffinate. The composition of the SOLVENT FOR the SEPARATION of PETROLEUM products containing acetone, isopropyl alcohol and water, wherein the solvent further comprises a stable nitroxyl the Stable nitroxyl radical 0,02 1,0
Water To 100
FIELD: petroleum processing, petroleum chemistry.
SUBSTANCE: method involves extractive rectification of gasoline fraction and the following extraction of distillate with mixed solvent N-methylpyrrolidone - sulfolane. At stage of extractive rectification mixed solvent N-methylpyrrolidone - sulfolane containing 60-80 wt.-% of N-methylpyrrolidone is used, and at stage of extraction the same mixed solvent N-methylpyrrolidone - sulfolane containing 80-95 wt.-% of sulfolane is used. Method provides simultaneous isolation of highly purified aromatic (C6-C8)-aromatic hydrocarbons from gasoline fractions with the extraction degree 99.8%.
EFFECT: improved method for isolating.
2 tbl, 1 ex
SUBSTANCE: invention includes the primary methanol separation on the hydrophilic ultrafine or superfine fiber up to the residual methanol concentration no more than 250 mg/l of the liquid hydrocarbons, extraction of the methanol from liquid hydrocarbons with water, separation of the water solution of methanol from liquid hydrocarbons, removal of the purified hydrocarbons and water solution of methanol, if necessary the removal of the residual water solution of methanol from liquid hydrocarbons with sorption and following desorption and/or catalytical conversion obtaining hydrocarbons and water.
EFFECT: decrease of the energy consumption and efficiency increase in the process of liquid hydrocarbons purification from water methanol solution.
2 cl, 7 ex, 9 dwg
SUBSTANCE: invention relates to a method of extracting oxidised sulphur compounds, particularly sulphoxides and sulphones, from a mixture with hydrocarbons and sulphur compounds by treating the mixture with an extractant in weight ratio raw material: extractant from 1:1 to 1:7, and temperature from 30 to 70°C. The extractant used is isopropyl alcohol with water content from 30 to 50 vol. % (36.55-59.77 wt %) and hydrocarbon content from 0.05 to 0.1 wt %.
EFFECT: high content of sulphoxides and sulphones in the concentrate.
7 ex, 1 tbl
SUBSTANCE: present invention relates to an ethylene oligomerisation method. The method involves the following steps: (i) oligomerisation of ethylene in a reactor in the presence of a solvent and a catalyst composition; (ii) outlet of a product stream containing the catalyst composition from the reactor; (iii) deactivation and extraction of the catalyst composition with a polar phase, wherein the product stream and the polar phase are mixed in a dynamic mixer having a rotor and a stator, having concentric operating rings which are cut and/or bored radially, wherein the annular gap lies in the range from 0.1 to 5 mm. The invention also relates to a reactor system for realising said method.
EFFECT: present invention enables to easily and quickly deactivate and extract a catalyst composition from an organic product stream of an oligomerisation reactor.
SUBSTANCE: invention relates to a method of producing isoprene via liquid-phase reaction of formaldehyde and isobutylene and/or substances which are sources thereof, for example, 4,4-dimethyl-1,3-dioxane and trimethyl carbinol, in the presence of an aqueous solution of an acid catalyst at high temperature and pressure while extracting a vapour-liquid stream of reaction products and water from the reaction zone. Further, the vapour-liquid stream is separated, cooled, condensed and split into aqueous and oily layers, followed by extraction of isoprene from the oily layer. The method is characterised by that before extracting isoprene, the oily layer is washed with water in a countercurrent column at temperature 20-60°C, pressure 0.4-1.0 MPa in weight ratio (10-50):1, respectively.
EFFECT: method reduces loss of isoprene during extraction thereof.
3 cl, 1 tbl, 4 ex, 1 dwg
FIELD: power engineering.
SUBSTANCE: method to produce liquefied hydrocarbon gases includes stabilisation of a deethanised gas condensate by extraction of hydrocarbon gases from it, their cooling, mixing of liquefied hydrocarbon gases (LHG) with water, washing of methanol and phase separation into LHG and a water-methanol solution. At the same time at the washing stage the mixture of LHG with water is dispersed in water phase, then coalescence of finely dispersed drops of the water-methanol solution is carried out, afterwards phase separation is carried out. A plant to produce liquefied hydrocarbon gases comprises the following serially joined components: a rectification tower of gas condensate stabilisation, a cooling device, a mixing device, at least one reservoir for methanol washing and a separating reservoir. At the same time at least one reservoir for methanol washing and the separating reservoir are arranged in the form of sections of a reservoir filter, separated by two partitions with coalescent filter cartridges installed in them to form three sections in the inner cavity of the specified filter, besides, two sections represent reservoirs of methanol washing, and the third section - a separating reservoir.
EFFECT: using the invention will make it possible to minimise capital and current costs for a plant due to its simplification.
5 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: selective dissolvent is a mixture containing 15-30 wt % of N-methyl pyrrolidone, 65-80% triethylene glycol, 3-7 wt % of water.
EFFECT: using this invention makes it possible to increase extent of extraction of aromatic hydrocarbons from reforming catalysate.
1 cl, 4 ex, 1 tbl
SUBSTANCE: invention relates to two versions of the method of using dimethyl ether (DME) synthesis products to convert oxygenates to olefins. One of the versions comprises the following steps: extracting from a DME reactor a stream containing DME, water and methanol; separating, in a liquid-gas separator, carbon dioxide gas from the stream from the DME reactor to obtain a degassed output stream; feeding the degassed output stream into a DME column to obtain crude DME material and a solvent stream containing methanol and water; feeding the crude DME material into a reactor for converting oxygenates to olefins to obtain an olefin-containing output stream which also contains oxygenates; separating the olefin-containing output stream to obtain a fraction containing light olefins and a fraction containing heavy olefins, wherein the fraction containing light olefins contains ethylene and the fraction containing heavy olefins contains C4+; bringing the fraction containing light olefins into contact with a first portion of a solvent stream in a first zone of reacting with solvent to obtain a first olefin-containing purified stream and a first oxygenate-containing extract; bringing the fraction containing heavy olefins into contact with a second portion of the solvent stream in a second zone for reacting with solvent to obtain a second olefin-containing purified stream and a second oxygenate-containing extract.
EFFECT: disclosed method enables integration of dimethyl ether synthesis with conversion of oxygenates to olefins.
8 cl, 1 dwg
SUBSTANCE: invention relates to method of reducing acidity of hydrocarbon raw material, which includes: (a) contact of hydrocarbon raw material, which contains organic acid, with phosphonium ionic liquid, non-mixable with hydrocarbon raw material, including tetrabutyl phosphonium methane sulfonate, with obtaining mixture, which contains hydrocarbon and said liquid; (b) separation of mixture with obtaining effluent, which contains hydrocarbon, and effluent, which contains phosphonium ionic liquid, containing organic acid. In addition, method includes contact of effluent, which contains ionic liquid, with regenerating solvent and separation of effluent, containing ionic liquid, from regenerating solvent with obtaining flow of extract, which contains organic acid, and flow of regenerated ionic liquid, which contains phosphonium ionic liquid, non-mixable with raw material, where regenerating solvent contains water, and flow of regenerated ionic liquid additionally contains water and where effluent, which contains hydrocarbon, contains phosphonium ionic liquid, non-mixable with raw material, additionally including washing of, at least, part of effluent, which contains hydrocarbon, with water with obtaining effluent, containing washed hydrocarbon, and flow of waste water, and flow of waste water contains phosphonium ionic liquid, non-mixable with raw material; with, at least, part of flow of waste water being, at least, part of regenerating solvent.
EFFECT: claimed method can ensure removal of up to eighty percent of organic acids from hydrocarbon.
10 cl, 2 dwg, 5 ex, 1 tbl
SUBSTANCE: method of inhibiting polymerisation of vinyl aromatic compounds during extractive distillation includes the following steps: a) providing a mixture containing styrene; b) adding one 2-sec-butyl-4,6-dinitrophenol (DNBP) inhibitor to the mixture; and c) performing extractive distillation of the mixture after step b) to of separate styrene; d) forming less than 200 ppmw of a polymer from the styrene.
EFFECT: minimum polymer formation.
5 cl, 1 tbl, 1 ex