Composition for dehydration and desalting of crude oil
(57) Abstract:The invention relates to the preparation of oil by dehydration and desalting for demulsification of oil and improve the rheological properties. Composition for dehydration and desalting of crude oil contains non-ionic demulsifier - block copolymers of ethylene oxides and propylene-based monoethylene glycol with a molecular weight of 4,300 and a solvent. The composition additionally includes VAT residue production butyl ether of monoethylene glycol and diethylene glycol, wt. %: Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of monoethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane of 0.5 to 4.0. The ratio of components in the composition, wt.%: block copolymers of ethylene oxides and propylene-based monoethylene glycol 15,0-50,0; VAT residue 5,0-40,0; the solvent (methanol) to 100.0. Effect: the use of the composition improves the efficiency of dehydration and desalting of crude oil, and also improves the flow properties of petroleum products. 1 Il., table 4. The invention relates to the preparation of oil and can be used for dehydration and desalting of crude oil, as well as PR is about the discharge of produced water.Known nonionic demulsifying agent containing copolymers of ethylene oxides and propylene-based glycol and propylene glycol - Reapon-4B (see 1. THE 6-55-54-91).The disadvantage of this demulsifier is low demulsifying efficiency in the destruction of high-viscosity oils coal-bearing horizon, and oils containing mechanical impurities. Reapon-4V slightly improves the rheological properties of the listed types of oil products.Known composition for dehydration and desalting oil emulsion containing 50-55% aqueous-methanol solution of nonionic blockcopolymers of ethylene oxides and propylene - Reapon-4V and polyglycolide resin - waste production etilenglikola and additionally water in the following ratio, wt. %: 50-55% aqueous-methanol solution of nonionic blockcopolymer oxides of ethylene and propylene 70-82; waste production etilenglikola - polyglycolide resin 7-17; water - other (see 2. RF patent 2091435, BI 27, 27.09.97).The disadvantage of this composite combination of reagents is that in this unstable mixture composition and molecular mass distribution of waste production etilenglikola the settings above composition
The closest present invention is a composition for dehydration and desalting of crude oil containing 37,0-62,0 wt.% blockcopolymer ethylene and propylenoxide, 0.5 to 5.0 wt.% mono-C2-C4-Olkiluoto ether of ethylene glycol and diethylene glycol and up to 100% of solvent in the following ratio: copolymers of ethylene and propylenoxide 37-62; mono-C2-C4-alkilany ether of ethylene glycol and diethylene glycol 0,5-5,0; solvent - rest (see 3. RF patent 2009165, BI 5, 15.03.94).The disadvantage of this method is unsatisfactory demulsifying efficiency in the dehydration of coal oils, high viscosity at the specific consumption of reagents 50-100 g/t of oil. In addition, the above compounds exhibit low efficacy in reducing viscous properties of the production wells.The objective of the invention is to increase the effectiveness of the composition for dehydration and desalting of crude oil and the expansion of the range of effective surfactant reagents for dehydration and desalting of crude oil, as well as improving the rheological properties of the transported products.The problem is solved by a composition for dehydration and desalting of crude oil, containing neionogena 4300 and the solvent. Moreover, it additionally contains a VAT residue production butyl ether of monoethylene glycol and diethylene glycol, comprising (wt.%): Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of monoethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 0,5-4,0 in the following ratio, wt. % include block copolymers of ethylene oxides and propylene-based monoethylene glycol - 15,0-50,0; VAT residue - 5,0-40,0; the solvent (methanol) - up to 100.0.Characteristics of the used substances.Block copolymers of ethylene oxide and propylene, for example, based on glycols - Reapon-4B:
where A= -C2H4- or-C3H6-, n=14-16, m=24-27 with molecular weight of 4300; mass fraction of the main substances 555%; kinematic viscosity at 0oC 40 mm2/C; temperature limits of lightening solution concentration of 100 g aqueous solution of NaCl 50-60oC; pour point not higher than minus 50o(See 1. THE 6-55-54-91).VAT residue production and butyl ethers of ethylene glycol (see 4. THE 6-01-646-84) and Ditylenchus 8-15, butyl ether of diethylene glycol 70-75, a mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 3-5. The refractive index n20=1,4; relative density204= 0,950-0,970; kinematic viscosity20= 6-10 mm2/c.
The composition is prepared by simple mixing of the components.A specific example of preparation 1 g of the composition: 0.35 g of blockcopolymer oxides of ethylene and propylene-based monoethylene glycol with molecular weight of 4300 added 0.20 g of the cubic residue and add 0.45 g of solvent (methanol).From the obtained composition is prepared 1% aqueous solution and determine its demolicious efficiency.The definition of a demulsifying performance was carried out on artificial emulsions of oils Oreshkova (Yakutia) and the Verkhnechonskoye (Irkutsk region) deposits with a water content of 30 wt.%, as well as samples of natural emulsions coal Romashkinskoye oil field water content 56 and 57.4 wt. % selected from well 26720 with time interval 1 month, respectively (see tab. 1-4).In the emulsion dose of the test compound, the mixture is shaken on a laboratory shaker for 10 minutes at a temperature of 55-60oC. Then thermostatically residual water content in the oil is carried out in accordance with GOST 14870-77 method Dean-stark.Rheological studies are carried out on a rotational viscometer "RHEOTEST-2 coaxial measuring device. Determine the dependence of the dynamic viscosity (mPas) water-oil emulsions from the temperature (to(C) at the shear rate (Drc-1) 381-1corresponding to the linear velocity v (m/s) of the fluid in the pipeline is approximately 0.8-1.0 m/s (Fig.1).The analysis of the results shows that the use of the proposed structure allows for effective dehydration and desalting, and also improves the flow properties of petroleum products. Composition for dehydration and desalting of crude oil containing nonionic demulsifier - block copolymers of ethylene oxides and propylene-based monoethylene glycol with a molecular weight of 4,300 and a solvent, characterized in that it further comprises a VAT residue production and butyl ethers of ethylene glycol and diethylene glycol, comprising, by weight. %: Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of ethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 0,5-4,0 in the following ratio compoletely (methanol) - To 100.0
FIELD: polymer production.
SUBSTANCE: invention relates to polyester- and polyether-based block copolymers prepared via catalytic addition of alkylene oxides to polyester-polyols. Polyesters are obtained by reaction of bifunctional alcohols with bifunctional carboxylic acids. Catalyst is selected from compounds based on metal cyanides.
EFFECT: enabled production of polyols with polyester and polyether groups in molecule by simple ways, which polyols have no disadvantages of products obtained by reaction of polyether-polyols with multifunctional carboxylic acids.
6 cl, 6 ex
SUBSTANCE: invention relates to synthesis of highly stable, chemical-resistant perfluoropolyesters based on tetrafluoroethylene which are used as a base for low-temperature oil lubricants for space-rocket equipment. The invention describes a method of producing polytetrafluoroethylene oxide through photooxidation of tetrafluoroethylene with oxygen under UV radiation in the presence of a solvent and subsequent solvent distillation. The method is distinguished by that the process is carried out at temperature between minus 40°C and minus 60°C. The solvent used is perfluorotriethylamine. After solvent distillation, the product undergoes thermal treatment at 300-350°C and stabilisation with fluorine at 180-260°C.
EFFECT: design of an efficient method of producing highly stable chemical-resistant perfluoropolyesters based on tetrafluoroethylene.
1 cl, 2 ex, 2 tbl
SUBSTANCE: invention relates to polyesters which are used in synthesis of flexible foamed polyurethanes. Copolyester - a liquid at 50°C - has (a) an initiator segment which is a polyether with molecular weight between 300 and 1500 and at least two hydroxyl groups, and (b) at least three ester links per molecule of copolyester on average, where the said links are from a hydroxyl-containing fatty acid which contains 7 or more carbon atoms, or a mixture of two or more of the said fatty acids. The fatty acids contain a secondary hydroxyl which lies at least five carbon atoms from the carbonyl carbon atom of the acid group of the fatty acid and a primary hydroxyl with one or more hydroxymethyl groups. The copolyester contains 3.5-10 ester links per total number of hydroxyl, primary amine and secondary amine groups of the initiator compound.
EFFECT: invention enables to obtain a polyester with high functionality and low sensitivity to the level of an organotin catalyst used in synthesis of foamed polyurethane.
9 cl, 4 tbl, 17 ex
SUBSTANCE: present invention relates to resorbable block copolymers for producing resorbable surgical or therapeutic implants for humans and animals. The block copolymer is of type AB or ABA. Block A is formed by polyester and block B is formed by polyether. Type AB has the formula: E-(O-D-CO-)n-(O-CH2-CH2-)m-O-F, where the structural link E-(O-D-CO-)n forms block A, and link -(O-CH2-CH2-)m forms block B. Type ABA has the formula: E-(O-D-CO-)n-(O-CH2-CHr)m-O-(CO-D-O-)n'-E, in which links E-(O-D-CO-)n and E-(O-D-CO-)n. form block A, and link -(O-CH2-CH2-)m forms block B. Content of block B ranges from 0.1 to 4 wt %. The invention also relates to a method of producing and cleaning said block copolymers contaminated with monomers.
EFFECT: obtaining block copolymers or implants from said block copolymers, characterised by high mechanical strength, elasticity, viscosity and fast kinetic resorption.
42 cl, 3 tbl, 4 ex
SUBSTANCE: present invention relates to a method of producing polyether ester polyols which are used in producing polyurethanes. The method involves reacting initiating compounds with alkylene oxides with basic catalysis in the presence of fatty acid esters. The initiating compounds are compounds having Tserevitinov-active hydrogen atoms, and the fatty acid esters used are esters in which fatty acid radicals do not contain free OH groups.
EFFECT: method enables to obtain polyols which are based on reclaimable material and are used in polyurethane compositions as a component which is capable of reacting with isocyanates.
3 cl, 4 tbl, 10 ex
SUBSTANCE: present invention relates to a method of producing polyether-ester polyols, wherein starting compounds with Zerewitinow-active hydrogen atoms (a) react with at least one alkylene oxide (b) in the presence of at least one amine (c), selected from a group consisting of a tertiary amine, unsubstituted imidazole and substituted imidazole, in the presence of at least one fatty acid ester (d) and where 99 wt % of the starting compounds with Zerewitinow-active hydrogen atoms (a) are embedded in the obtained polyether-ester polyol, wherein component (d) is added before, during or after dosing component (b), and before dosing component (b) the polyether-ester polyol (e) in amount of 3.0-20.0 wt % with respect to all components (a), (b), (c), (d) and (e) is mixed with components (a), c and optionally (d). The invention also describes a polyether-ester polyol obtained using said method, use thereof to make foamed polyurethane material and the foamed polyurethane material.
EFFECT: creating a method of producing polyether-ester polyols which enables to completely embed fatty acid esters into the formed polyether-ester polyols, which in turn improves holding capacity of foam material compositions for hydrocarbon-based foaming agents, thereby enabling fast production of flexible solid foam.
15 cl, 4 dwg, 4 tbl, 10 ex
SUBSTANCE: invention relates to a method of producing polyester polyol with concentration of ether groups between 9.0 mol/kg polyester polyol and 22 mol/kg polyester polyol, use of the polyester polyol obtained using said method, a method of producing PUR- or PUR/PIR foam plastic based on polyester polyol, as well as use of said PUR- or PUR/PIR foam plastic. The method of producing polyester polyol includes (i) at the first step (A) isophthalic acid, optionally in form of an alkyl ether with 1-4 carbon atoms in the alkyl, and/or terephthalic acid, optionally in form of an alkyl ether with 1-4 carbon atoms in the alkyl, reacts with (B) an oligoethylene glycol of formula H-(OCH2CH2)n-OH with an average number of oxyethylene groups n between 3.0 and 9.0 in the presence of at least one catalyst selected from a group consisting of tin (II) salts, bismuth (II) salts and titanium tetraalkoxylates, at temperature between 160°C and 240°C and pressure between 1 and 1013 mbar for 7 to 100 hours, and (ii) at the second step, the reaction mixture obtained at step (i) reacts with (C) phthalic acid and/or phthalic acid anhydride.
EFFECT: obtaining polyester polyols which, when used in PUR/PIR rigid foam materials, improve incombustibility.
13 cl, 2 tbl, 11 ex