Method

FIELD: chemistry.

SUBSTANCE: invention is a method of supplying liquid feed streams in a polymerization process. Method for supplying fresh feedstock selected from a fresh comonomer and a fresh inert hydrocarbon to a polymerization reactor is described. The polymerization reactor is a part of polymerization process that includes recovery systems at a high 0.5 MPa (5 bar) or higher and a low pressure of less than 0.5 MPa (5 bar). The method comprises feeding of mentioned fresh feedstock and a process stream comprising a first component selected from hydrogen, nitrogen and methane and a second component that is a monomer to a separator at a pressure of 0.4 MPa (4 bar) or less to obtain the first stream comprising most of the first component and a second stream comprising most of the fresh feed stream and most of the second component and feeding the second stream to the polymerization reactor. Method of treating a fresh feed stream is also described.

EFFECT: preparation of a polymerization process having a high efficiency for the desired components of the final polymer, for example a monomer, but a low efficiency for other components, for example hydrogen.

20 cl, 3 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: present invention relates to an oxolanyl compound-containing composition and use thereof. Described is a vinyl content modifier composition which contains at least one oxolanyl compound selected from a group consisting of: where R1 and R2 are independently hydrogen or an alkyl group and the total number of carbon atoms in -CR1R2- ranges from 1 to 9 inclusively; R3, R4 and R5 are independently -H or -CnH2n+1, where n=1-6, wherein said at least one oxolanyl contains at least 52 wt % of the meso-isomer of the at least one oxolanyl compound, wherein a residue is formed from D- and L-isomers. Described also is a polymerisation method, which includes a step of polymerising at least one conjugated diene monomer in the presence of at least one organometallic anionic initiator and said composition comprising to obtain a polydiene polymer characterised by vinyl content in the range of 10% to less than 100%. Described also is a polydiene (co)polymer obtained using said method, a tyre containing said polydiene (co)polymer. Described is polymerisation method, which includes polymerising 1,3-butadiene in the presence of an oxolanyl compound 2,2-di(2-tetrahydrofuryl)propane, which contains at least 52 wt % of a meso-isomer, wherein the residue is formed from D- and L-isomers, wherein said method leads to the production of a polydiene polymer, characterised by vinyl content in the range of 10% to 100%, using an organolithium anionic initiator, and carrying out the method such that the peak polymerisation temperature is in the range of 85°C to 120°C. Also described is a tyre containing a polydiene (co)polymer.

EFFECT: high activity of the composition which contains an oxolanyl compound when used as a vinyl content modifier in polymerisation methods.

24 cl, 6 dwg, 5 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of polymerising a styrene monomer in the presence of a bromated fire retardant. Described is a method for suspension polymerisation of a styrene monomer to obtain polystyrene, the method comprising steps of: a) heating a polymerisation suspension containing a styrene monomer to at least 60°C, b) feeding an initiator into said heated polymerisation suspension during a polymerisation reaction for a period of 2-4 hours continuously or periodically in at least two portions, wherein said period begins at monomer conversion of 65% or less, and said initiator is characterised by half-life, at temperature at which said initiator is fed, of not more than 60 min, where during the polymerisation reaction, the bromated fire retardant is present in the polymerisation suspension.

EFFECT: polymerising styrene in the presence of a bromated fire retardant to obtain polystyrene, having at least the same molecular weight as polystyrene obtained in the absence of a fire retardant.

11 cl, 2 tbl, 9 ex

Polymer dispersions // 2555027

FIELD: chemistry.

SUBSTANCE: invention refers to coating compositions containing dispersions of multi-stage polymers, to a method for producing the above dispersions and using the coating compositions. The dispersion is prepared by two-stage emulsion polymerisation the first stage of which involves carrying out a reaction of (A1) at least one (meth)acrylic acid alkyl ester with 1-4 carbon atoms, (B1) at least one vinylaromatic compound containing up to 20 carbon atoms and (C1) at least one hydroxyalkyl(meth)acrylate with 1-4 carbon atoms in the presence of at least one initiator; the second stage involves radical co-polymerisation of a co-polymer (A2) prepared at the first stage with at least one (meth)acrylic acid alkyl ester with 1-8 carbon atoms.

EFFECT: compositions are used for one-component or two-component coatings applied on polymers, wood, paper or metal, or as an adhesive.

21 cl, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a tertiary amine group-containing (meth)acrylate copolymer by free-radical solution polymerisation of a mixture of monomers, containing: a) 30-70 wt % alkyl ether of acrylic acid or methacrylic acid with 1-4 carbon atoms in alkyl groups, b) 70-30 wt % alkyl ether of acrylic acid or methacrylic acid with a tertiary amine group in the alkyl radical and c) 0-10 wt % other copolymerisable vinyl monomers. The mixture of monomers is mixed with one or more polymerisation initiators, optionally one or more chain-terminating agents and one or more solvents, and a polymerising mixture is obtained. The mixture is polymerised at 30-120°C for 2-24 hours to form a styrene polymer which degassed by distillation or extrusion to obtain a copolymer.

EFFECT: obtaining a copolymer with molecular weight (Mw) of 25000-75000 g/mol, polydispersity of 2,1-2,9 and residual solvent content of less than 1000 ppm.

7 cl, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to controlling olefin polymerisation. Described is a method of polymerising olefins, which includes polymerisation of at least one olefin monomer in more than one polymerisation zone in one or more reactors. Polymerisation is carried out in an apparatus having one or more reaction vessels into which an olefin monomer and catalyst components are fed and which contain a stirred layer of the formed polymer particles. The polymerisation method includes steps of: feeding into a first polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; feeding into the next polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; removing from the last polymerisation zone the obtained polymer with polydispersity of about 5-20. The amount of gaseous hydrogen fed into the reaction vessels by a recycling gas feeding system is set to maintain a constant flow rate of the melt of the obtained polymer.

EFFECT: controlling content of the obtained composition in different polymerisation zones, widening and controlling the molecular weight distribution of the polymer.

9 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: claimed invention relates to bis(acyl)phosphine oxide of formula (I) and based on it radiation-curable compositions, which can be applied in the chemical industry: , where R represents C1-C18 alkyl.

EFFECT: claimed are novel effective polymerisation photoinitiators and based on them compositions.

24 cl, 5 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to (meth)acrylate polymer, which is obtained by polymerising a mixture comprising a) 0.1 to 99.9 wt % of at least one (meth)acrylate of general formula where residues R1-R6 and m assume values given in the description, and b) 99.9 to 0.1 wt % of one or more ethylenically unsaturated monomers which are different from (a) and are compolymerisable with (a), wherein components (a) and (b) constitute 100 wt % of the polymerisable components of the mixture, wherein MW of the polymer ranges from ≥1000 to ≤50000 g/mol. The formed polymers can be used as UV initiators for polymerisation reactions used in printing ink.

EFFECT: obtaining (meth)acrylate polymers which can be used as polymer initiators or ink additives.

26 cl, 2 tbl, 3 dwg, 11 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a multimodal polyolefin polymer and an apparatus for production thereof. A method of production at temperature of 40-150°C and pressure of 0.1-20 MPa in the presence of a polymerisation catalyst in a first and a second polymerisation reactor connected in series, where in the first reactor a first polyolefin polymer is obtained in suspension in the presence of hydrogen and in the second reactor a second polyolefin polymer is obtained in the presence of a lower hydrogen concentration than in the first reactor, the method comprising: a) withdrawing from the first reactor a suspension of solid polyolefin particles in a suspension medium containing hydrogen; b) feeding the suspension into a flash drum at a lower pressure than that of the first reactor; c) vaporising part of the suspension medium; d) withdrawing a hydrogen-depleted suspension from the flash drum and feeding it into the second reactor; e) separating gas from the gas-phase of the flash drum and feeding it into a heat exchanger; f) condensing part of the gas separated from the flash drum; and g) returning the liquid obtained in the heat exchanger to the polymerisation process at a point where suspension is present.

EFFECT: apparatus for producing a multimodal polyolefin polymer is described.

14 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of inhibiting the polymerisation of (meth)acrylic acid and/or esters of (meth(acrylic acid by the introduction of an oxygen-containing gas into (meth)acrylic acid and/or ester of (meth)acrylic acid, and (meth)acrylic acid and/or ester of (meth)acrylic acid has at least a 95% purity degree, contains an anti-polymerisation stabiliser and is in the liquid aggregate state; introduction of the oxygen-containing gas is performed into the pipeline, which contains liquid (meth)acrylic acid and/or liquid ester of (meth)acrylic acid, which is supplied to fill the reservoir through a side output opening as the pure product after the distillation or rectification purification in the column. The content of oxygen, for instance, in liquid acrylic acid can reach 12 ppm.

EFFECT: elaboration of the method for the inhibition of (meth)acrylic acid polymerisation.

8 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: photopolymerisable composition contains a thermoplastic polymer, a solvent, a dimethacrylic compound and a photoinitiator. It differs by the fact that the thermoplastic polymer contains polyvinylbutyral; the solvent is hydroxyalkyl(meth)acrylate specified in a group of 2-hydroxyethylmethacrylate, 2-hydroxyethylacrylate, 2-hydroxypropylmethacrylate or 2-hydroxypropylacrylate; the dimethacrylic compound is phosphorus chlorine dimethacrylate; the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone in the following proportions, weight portions: polyvinylbutyral 1-10, hydroxyalkyl(meth)acrylate 10-60, phosphorus chlorine dimethacrylate 30-80, 2-hydroxy-2-methyl-1-phenyl-1-propanone 1-2.

EFFECT: producing uncoloured optically transparent polymer materials highly adhesive to silicate glass and low combustible.

1 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of polymerising at least one alpha-olefin containing 2-12 carbon atoms in the presence of a supported chromium oxide-based catalyst. The supported chromium oxide-based catalyst is a titanium-modified supported chromium oxide-based catalyst. The chromium oxide-based catalyst is supported on a heat-resistant oxide. The titanium-modified supported chromium oxide-based catalyst is subjected to two-step heat treatment, where: (1) the first step includes heating the catalyst in an inert atmosphere to 600-900°C, holding the catalyst for 8 hours or less in the inert atmosphere at 600-900°C; and (2) the second step includes treating the catalyst obtained at step (1) in an oxidative atmosphere at 400-700°C for 2-10 hours. The maximum temperature at step 2 is always lower than the maximum temperature at step 1, wherein the difference between maximum temperature at step 1 and the maximum temperature at step 2 is 50-250°C. The catalyst is not prepared using a method for combined gelling and includes depositing a titanium compound on a support by adding and/or impregnation.

EFFECT: method enables to obtain a polymer product with desirable properties and achieve high catalyst activity.

22 cl

FIELD: chemistry.

SUBSTANCE: present invention relates to a procatalyst composition for producing a catalyst used for olefin polymerisation. Said composition includes a combination of a magnesium-containing component, a titanium-containing component and an internal electron donor containing adamantane dicarboxylate, where the adamantane dicarboxylate has the structure (III) where R1, R2 are identical or different, each of R1 and R2 is selected from a group consisting of a substituted hydrocarbyl group containing 1-20 carbon atoms, an unsubstituted hydrocarbyl group containing 1-20 carbon atoms and combinations thereof. The invention also relates to a catalyst composition for polymerisation of olefins, which contains said procatalyst composition, and a method of producing an olefin-based polymer using said catalyst composition.

EFFECT: adamantane-based catalyst composition enables to obtain propylene-based olefins which are characterised by high isotacticity and a wide molecular weight distribution.

16 cl, 3 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methods of terminating polymerisation in a reactor for gas-phase polymerisation with the application of an idling mode. The method of transferring the reactor for gas-phase polymerisation into the idling mode includes: introduction of a polymerisation neutralising agent into the reactor in an amount sufficient for the termination of polymerisation in it; termination of the polymer product discharge from a reactor; termination of the supply of an initial reaction mixture and catalyst material into the reactor; adjustment of pressure in the reactor from a value of pressure in the operation mode to the value of pressure in the idling mode, adjustment of a reduced rate of the circulating fluid medium, passing through the reactor, from a value of the reduced rate in the operation mode to the value of the reduced rate in the idling mode and support of the reactor in the idling mode for the certain time period. The version of the method is also claimed.

EFFECT: reduction of pollution in the reactor is provided.

15 cl, 3 tbl, 2 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to controlling olefin polymerisation. Described is a method of polymerising olefins, which includes polymerisation of at least one olefin monomer in more than one polymerisation zone in one or more reactors. Polymerisation is carried out in an apparatus having one or more reaction vessels into which an olefin monomer and catalyst components are fed and which contain a stirred layer of the formed polymer particles. The polymerisation method includes steps of: feeding into a first polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; feeding into the next polymerisation zone one or more olefin monomer streams with hydrogen concentration of about 0-70 mol %; removing from the last polymerisation zone the obtained polymer with polydispersity of about 5-20. The amount of gaseous hydrogen fed into the reaction vessels by a recycling gas feeding system is set to maintain a constant flow rate of the melt of the obtained polymer.

EFFECT: controlling content of the obtained composition in different polymerisation zones, widening and controlling the molecular weight distribution of the polymer.

9 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a multimodal polyolefin polymer and an apparatus for production thereof. A method of production at temperature of 40-150°C and pressure of 0.1-20 MPa in the presence of a polymerisation catalyst in a first and a second polymerisation reactor connected in series, where in the first reactor a first polyolefin polymer is obtained in suspension in the presence of hydrogen and in the second reactor a second polyolefin polymer is obtained in the presence of a lower hydrogen concentration than in the first reactor, the method comprising: a) withdrawing from the first reactor a suspension of solid polyolefin particles in a suspension medium containing hydrogen; b) feeding the suspension into a flash drum at a lower pressure than that of the first reactor; c) vaporising part of the suspension medium; d) withdrawing a hydrogen-depleted suspension from the flash drum and feeding it into the second reactor; e) separating gas from the gas-phase of the flash drum and feeding it into a heat exchanger; f) condensing part of the gas separated from the flash drum; and g) returning the liquid obtained in the heat exchanger to the polymerisation process at a point where suspension is present.

EFFECT: apparatus for producing a multimodal polyolefin polymer is described.

14 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to method of polymerisation in circulation reactor. Claimed is method of polymerisation in circulation reactor of at least one olefin monomer in liquid diluents in order to obtain suspension, including solid particles of olefin polymer and said diluents, with ratio of factual volume concentration of solid substances in suspension and maximally possible geometrical volume concentration of solid substances in suspension, measured as volume density of non-compacted precipitated layer of particles RVCSP, constitutes V×0.065 or more, and ratio of integral path of middle-size particle precipitation in any point of reactor in any direction, perpendicular to flow direction to internal diameter of reactor loop is supported lower than [0.084×(V-6.62)+(0.69-RVCSP)×1.666], where V represents rate of suspension circulation, expressed in m/s, integral path of precipitation is determined as the total distance, expressed in diameter parts, passed by particle in any direction, perpendicular to flow direction, after pump, located upstream flow. Circulation reactor includes vertical and horizontal sections, as well as one pump. RVCSP represents ratio between factual volume concentration of solid particles in suspension and maximally possible geometric volume concentration of solid particles in suspension.

EFFECT: in claimed method of polymerisation lower packing of suspension particles in the process of passage through reactor is provided.

21 cl, 4 dwg, 14 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining homopolymers of α-olefins, in particular polyisobutylene, and copolymers of α-olefins, for example, isobutylene, 1- butene, 1-hexene, 1-octene, 1-decene, α-methyl-styrene, with dienes, for example, butadiene, isoprene, or other hydrocarbon, which contains at least one system of conjugated double carbon-carbon bonds, in presence of initiating systems. Method of obtaining poly-α-olefins or copolymers of α-olefins with dienes includes polymerisation of α-olefin or its copolymerisation with diene in medium of α-olefin monomer or hydrocarbon solvent in presence of initiating system, which includes ionic liquid and compound, which is Lewis acid. Method is characterised by the fact that quantity of added initiating system without accounting optional solvent constitutes from 0.001 to 1 g per 1 kg of initial α-olefin monomer.

EFFECT: reduction of amount of ionic liquid applied in polymerisation, which results in absence of necessity to extract it from obtained polymers and carry out the following regeneration.

8 cl, 1 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: described is a polymerisation catalyst system and a polymerisation method using said catalyst systems. The polymerisation catalyst systems may include a) a first catalytically active compound and b) a second catalytically active compound, the first catalytically active compound including an oxadiazole-containing compound. The oxadiazole-containing compound corresponds to the structural formula given below, wherein M is selected from a group comprising Ti, Zr and Hf; values or radicals from R2 to R10 are given in the claim

;

X is at least one leaving group.

EFFECT: oxadiazole-containing compound substantially has no hydrogen response, which enables improved and/or specific regulation of properties of the product when producing polymers using the described catalyst system.

12 cl, 6 dwg, 7 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymerisation of olefins in suspension reactors and particularly to particle size of a polymer obtained using said method. Described is a method of producing an olefin polymer by suspension polymerisation at 90-107°C in the presence of a chromium catalyst. The catalyst has activity of at least 1000 g polymer/g catalyst/h on a support with pore volume of at least 1.3 cm3/g. The method includes adding an antistatic agent to the polymerisation mixture in amount of 0.1-100 ppmw with respect to the diluent in the suspension. The obtained polymer has a particle size distribution which is such that less than 8 vol%, preferably less than 5 vol%, of the polymer particles have average diameter of 125 mcm or less.

EFFECT: considerable reduction of formation of deposits and contaminants, preventing formation of an electrostatic charge, obtaining a polymer with uniform particle size distribution.

12 cl, 4 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: method includes the supply of diluents and the first monomer into the first polymerisation reactor, formation of the first polyolefin in the first suspension, continuous discharge of the transported suspension from the first polymerisation reactor into the second polymerisation reactor. After that, the polymerisation of the second monomer is performed in the second polymerisation reactor with the formation of the second polyolefin. By means of the first discharge device of a continuous action, located on the second polymerisation reactor, pressure regulation in the second polymerisation reactor is realised and the rate of the suspension flow, discharged from the first polymerisation reactor, is supported higher than 4 ft/sec (1.2 m/s).

EFFECT: prevention of the reactor clogging and support of the suspension in a stable state in transportation makes it possible to increase efficiency, reduce the time of the system standstill and increase the total amount of production.

20 cl, 6 dwg

FIELD: polymerization catalysts.

SUBSTANCE: invention describes metallocene catalytic component of catalytic system for production of polyolefin with isotactic or syndiotactic/isotactic block structure with length of monomer unit up to C10, said component having general formula R"(CpR1R2R3)(Cp'R1R2')MQ2, where Cp represents cyclopentadienyl ring substituted by at least one substituent; Cp' is substituted fluorenyl ring; R" structural bridge imparting steric rigidity; R1 optional substituent in cyclopentadienyl ring located at a distance to bridge and including a bulky group XR*3 wherein X is selected from group IVA elements and R*, the same or different, are hydrogen or hydrocarbon radical containing 1 to 20 carbon atoms; R2 optional substituent in cyclopentadienyl ring, nearest to bridge and not vicinal to remote substituent, which substituent has formula YR# wherein Y is selected from group IVA elements and R#, the same or different, are hydrogen or hydrocarbon radical containing 1 to 7 carbon atoms; R3 optional substituent in cyclopentadienyl ring, nearest to bridge and being hydrogen or having formula ZR$ wherein Z is selected from group IVA elements and Rs, the same or different, are hydrogen or hydrocarbon radical containing 1 to 7 carbon atoms; R1' and R2' are independent substituents in fluorenyl ring, one of them having formula AR3’’’ wherein A is selected from group IVA elements and each of R’’’ represents independently hydrogen or hydrocarbon radical containing 1 to 20 carbon atoms and the other being hydrogen or second group AR3’’’; M is transition metal from group IVB or vanadium and each Q is either hydrocarbon radical with 1-20 carbon atoms or halogen.

EFFECT: enabled preparation isotactic or syndiotactic/isotactic block polymer with length of monomer unit up to C10.

30 cl, 13 dwg, 2 tbl, 10 ex

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