Catalysts for producing mould polyamide, method of their production and their application

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst for producing mould polyamides comprising a) at least, one lactamate, b) at least, one salt of a heteroatom-substituted organic acid selected from the group consisting of aminocaproates and/or amino-laurates of alkali and/or alkaline-earth metals and, if necessary c) lactam or a mixture of several lactams. The invention also relates to the method of producing the claimed catalyst, mould polyamide and the method of its production.

EFFECT: improving the quality of mould polyamides.

9 cl, 1 tbl, 1 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method involves single-step synthesis by reacting chlorine-containing monomers with sodium hydrosulphide and sulphur in the presence of a quaternary ammonium halide, followed by washing and drying the coagulum to obtain a polysulphide polymer, and after washing the coagulum, alkaline waste water containing sodium hydrosulphide and low-molecular weight polysulphide polymer is sent for recycling. Multi-step synthesis of the polysulphide polymer is simultaneously carried out via polycondensation of di- and polyhalides with sodium tetrasulphide in the presence of a dispersant, wherein the obtained dispersion of the high-molecular weight polysulphide polymer is washed with water and split using sodium sulphite and the recycled alkaline waste water from the single-step synthesis, containing sodium hydrosulphide and low-molecular weight polysulphide polymer; the split dispersion then undergoes coagulation, and the coagulum obtained via the multi-step synthesis is washed, purified and re-washed and the dried together with the coagulum washed after the single-step synthesis of the polysulphide polymer, and the effluent of weakly concentrated water after washing, coagulation and purification during multi-step synthesis is sent for recycling.

EFFECT: reduced cost of polysulphide polymer and low contamination level.

2 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: described is a method of obtaining a catalyst of an anionic ε-capralactam polymerisation by its direct interaction with an alkali metal compound in the presence of an aprotic solvent, removed after reaction completion, with a reaction being carried out at a temperature not lower than 60°C, with hydroxides or their combinations being applied as alkali metal compounds, and as active diluents - aliphatic hydrocarbons with the number of carbon atoms in the interval 5-9 or their mixtures, which form with a reaction product - water heterogenic azeotropes, removed in the course of conversion.

EFFECT: simplification and intensification of the catalyst obtaining process, increase of the catalyst activity.

2 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of polyamide resins in powder form. Spheroidal particles of polyamide or copolyesteramide with average diametre between 460 and 100 mcm are obtained through polymerisation in a solvent. The reaction medium is mixed with mineral filler - silica with average particle diametre between 1 and 30 µm. Polyamide or copolyester amide is obtained in powder form. The obtained powder is used to make coatings, ink compositions, paint compositions, cosmetic compositions, pharmaceutical compositions and alloys with metal powder or metal oxide powder. The polyamide or copolyester amide powder is used to make articles through oligomerisation by melting using a laser beam (laser sintering), infrared or UV radiation.

EFFECT: invention enables to obtain polyamide powder in form of particles with grain-size composition with average diametre between 60 and 100 mcm.

18 cl, 15 ex, 1 tbl, 1 dwg

FIELD: organic chemistry, polymers, chemical technology.

SUBSTANCE: invention relates to a method for preparing polyamide that can be used as a structural material. Polyamide is prepared by co-polymerization reaction of ε-caprolactam and 1,6-hexamethylene diisocyanate in the mass ratio = (95-90):(5-10) in the presence of catalyst and an activating agent. As catalyst method involves using ε-caprolactam Li-salt and 2,4-toluylene diisocyanate as an activating agent. The process is carried out at temperature (180 ± 5)°C up to depletion of lactam cycles followed by heating the reaction mass for 2 h. Invention provides preparing polyamides with enhanced values of destroying stress (breaking point) and provides expanding assortment of methods providing preparing polyamides with different physical-mechanical properties also.

EFFECT: improved preparing method.

2 tbl, 4 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing polyamide that can be used as a structural material. Polyamide is prepared by co-polymerization reaction of ε-caprolactam and 1,6-hexamethylenediisocyanate taken among the group of di-isocyanates or urethane prepolymer SKU-PFL-100 in the mass ratio = (95-90):(5-10) in the presence of catalyst and activating agent. As a catalyst method involves using ε-caprolactam Na-salts and 2,4-toluylenedi-isocyanate as an activating agent. The process is carried out at temperature (180 ± 5)°C up to depletion of lactam cycles followed by heating the reaction mass for 2 h. Invention provides preparing polyamides with enhanced values of destroying stress (breaking point) and to expand assortment of methods providing preparing polyamides with different physical-mechanical properties.

EFFECT: improved preparing method.

2 tbl, 10 ex

FIELD: organic chemistry, structural materials.

SUBSTANCE: claimed polyamide is obtained by copolymerization of ε-caprolactam and 2,4-toluylenediisocyanate in mass ratio of (95-95):(3-5) in presence of ε-caprolactam sodium salt at 180±5)°C up to exhausting of lactam cycles. Then reaction mass is heated for 2 h.

EFFECT: polyamides with increased elongation and failure stress; as well as with various physical and mechanical properties.

2 tbl, 8 ex

The invention relates to a method for producing polyamides, carried out in the presence of a catalyst

The invention relates to the field of chemistry of high-molecular compounds, and more specifically to the field of production of prepolymers based on ethers, dienes and siloxanes with terminal groups imename
The invention relates to increasing the molecular weight of the polyamide by using intended for this purpose, catalyst

The invention relates to a method for producing copolymers of activated anionic polymerization of lactams and can be used for manufacturing products for Rim technology to create high impact material from copolymers with improved physical-mechanical properties and a low content of gel-fraction

FIELD: chemistry.

SUBSTANCE: described is a method of obtaining a catalyst of an anionic ε-capralactam polymerisation by its direct interaction with an alkali metal compound in the presence of an aprotic solvent, removed after reaction completion, with a reaction being carried out at a temperature not lower than 60°C, with hydroxides or their combinations being applied as alkali metal compounds, and as active diluents - aliphatic hydrocarbons with the number of carbon atoms in the interval 5-9 or their mixtures, which form with a reaction product - water heterogenic azeotropes, removed in the course of conversion.

EFFECT: simplification and intensification of the catalyst obtaining process, increase of the catalyst activity.

2 cl, 1 tbl, 3 ex

FIELD: chemistry of lactams' derivatives.

SUBSTANCE: the present innovation deals with obtaining N-(2-chloroalkyl)- and N-alkyl-aromatic derivatives of lactams of the following general formula: , where R=H, Cl, R'=(CH2)3, (CH2)5 which could be modifiers of unsaturated carbon-chain caoutchoucs and rubber mixtures based upon them. The suggested method for obtaining the mentioned N-substituted lactams deals with combining N-chlorolactams and allyl benzene, moreover, as N-lactams one should apply either N-chlorobutyrolactam or N-chlorocaprolactam. The process should be carried out at molar ratio of N-chlorolactam to allyl benzene being equal to 1-1.15:1, at availability of a catalyzer as mono-tertiary-butylperoxy-α-methylmethoxyethoxyethyl ether of ethylene glycol taken at the quantity of 0.4-4.0% weight, in the medium of inert solvent, for example, chlorobenzene at 100-125° C for about 15-20 min. The innovation enables to shorten terms of reaction by 20-30 times, simplify the way for obtaining target products and widen the assortment of the obtained compounds, as well.

EFFECT: higher efficiency.

The invention relates to methods for caprolactamate sodium, used as catalyst for the anionic polymerization of lactams, for receiving polycaproamide and its copolymers

FIELD: chemistry.

SUBSTANCE: according to the present method, the feedstock for the catalyst is modified zeolite ferrierite which is moulded with a binder, said binder being aluminium oxides/hydroxides, with binder content of 15-50 wt % of the catalyst. The zeolite is modified by dealumination, washing with an aqueous acid solution and drying. Dealumination of the zeolite is carried out in an autoclave in the presence of solid anhydrous ammonium hexafluorosilicate of chemical formula (NH4)2SiF6 at 220-400°C for 0.5-10 hours. The weight ratio zeolite/anhydrous ammonium hexafluorosilicate is equal to 7-70. The zeolite is washed with 1-50% acid solution for 15-400 minutes at 20-100°C.

EFFECT: method enables to obtain catalysts with fewer defects in the form of extra-framework aluminium in zeolite channels, and also enables to remove diffusion barriers for passage of butene molecules in catalyst channels.

2 cl, 1 dwg, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: catalyst contains carrier from porous zeolite KL and binding agent and catalytically active substance - platinum. Carrier additionally contains tin tetrachloride pentahydrate nanopowder, and as binding agent - mixture of gibbsite and rutile powders in equal proportions, with particle size of each not exceeding 40 mcm. Ratio of ingredients is in the following range, wt %: platinum - 0.3-0.8, mixture of gibbsite and rutile powders - 25-70, zeolite KL - 29.12-74.69, tin tetrachloride pentahydrate - 0.01-0.08. Claimed catalyst is characterised by high activity in reactions of aromatisation of synthetic hydrocarbons.

EFFECT: invention also relates to method of obtaining such catalyst.

2 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: apparatus for producing a catalyst comprises a reservoir designed for preparing an aqueous mixed solution containing Mo compound, V compound and Nb compound, a dryer designed to spray-dry the aqueous mixed solution and a pipe for connecting the reservoir with the dryer such that the aqueous mixed solution can be fed from the reservoir into the dryer. In the apparatus, a heater designed to heat the aqueous mixed solution is mounted in the reservoir and/or the pipe, and a filter designed to filter the aqueous mixed solution is installed in the pipe. The apparatus and methods of producing a catalyst provide uniform supply of the prepared aqueous mixed solution into the dryer.

EFFECT: catalyst is then used in a method of producing an unsaturated acid or unsaturated nitrile.

20 cl, 6 dwg, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst composition for selective catalytic reduction of exhaust gas. The catalyst composition contains a vanadate of formula XVO4/S, where XVO4 denotes a vanadate of Bi, Sb, Ga and/or Al, optionally in a mixture with one or more vanadates of rare-earth metals, or in a mixture with one or more vanadates of transition metals, or in a mixture with one or more vanadates of transition metals and one or more vanadates of rare-earth metals, and S is a support which includes TiO2. A method of producing the catalyst composition is also disclosed.

EFFECT: improved heat resistance and improved NOx conversion activity of the supported catalyst composition.

13 cl, 1 dwg, 8 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a catalyst for deep hydrofining of oil fractions. The present method includes impregnating an aluminium oxide support with a solution of compounds of metals of groups VIII and VI with pH of the impregnating solution of 1.5-5.0, vacuum treatment of the support before contact thereof with the impregnating solution, using impregnation at high temperature. The starting compounds used for preparing the impregnating solution are sodium salts Mo and one of modifiers X selected from the group (B, P, Si, V, Zn, Ge, Sn), which are soluble in water in molar ratio Mo/X=12/1, after which the solution is passed through a column with a cationite in H+ form and Co or Ni acetate is added to said solution.

EFFECT: disclosed method enables to obtain catalysts having high activity and selectivity with respect to hydrodesulfurisation, hydrodenitrogenation and hydrogenation of olefins and aromatic compounds.

2 cl, 5 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: method includes preparation of carrier by thermal processing at 500°C, application of alcohol film-generating solution by method of stretching at rate 100 mm/min, drying at 60°C for 1 h and annealing at 750°C for 4 h. Film-generating solution is applied on fibreglass carrier by method of soaking with further drying at 60°C for 1 h and annealing at 600-750°C for 1 h. Catalyst, which is obtained in form of cloth, is cut at output in accordance with reactor shape and packed in layers at angle of 20-30°, with formation of honeycomb structure, with the following component ratio in film-generating solution, wt %: Ce(NO3)3·6H2O - from 6.0 to 12.0, SnCl4·5H2O - from 16.6 to 22.3, C6H4OHCOOH - from 9.1 to 10.0, 96%-by weight C2H5OH - the remaining part.

EFFECT: method makes it possible to obtain catalysts, characterised by high permeability of gas mixture flow.

2 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the field of selective catalytic reduction of nitrogen oxides, namely to a material of a carrier for the catalyst, used in the said process. The claimed carrier material represents particles of anatase titanium dioxide, including ≥85% by dry weight of TiO2 and ≤10% by dry weight of SiO2, with (i) SiO2 being mainly in the form, selected from the group, consisting of forms with the low molecular weight, nanoparticles and their combinations; and (ii) at least 50% of silicon atoms being in states Q3, Q2, Q1 and Q0 of the coordination environment. The invention also relates to a catalytic device for the neutralisation of Diesel exhaust, including such particles, a system for Diesel exhaust regulation, including the said catalytic device, a method in which the conversion of nitrogen oxides is catalysed in the presence of the claimed particles of anatase titanium dioxide, as well as to methods of obtaining the said particles.

EFFECT: claimed particles make it possible to increase the thermal stability of the final catalyst with the preservation or increase of the catalytic activity for the selective catalytic reduction of nitrogen oxides from mobile devices, operating on lean mixtures.

44 cl, 18 dwg, 15 tbl, 18 ex

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