Formaldehyde (C07C47/04)

ethod for producing acrylic acid from methanol and acetic acid // 2610431
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing acrylic acid from methanol and acetic acid, which involves following operations: through a first reaction zone A, which is loaded at least one oxidation catalyst A, passing a stream of reaction gas mixture A, containing reagents – methanol and molecular oxygen, as well as at least one inert gas diluent, different from water vapour, and when passing said reaction zone A methanol contained in supplied reaction gas mixture A, in conditions of heterogeneous catalysis is oxidised to formaldehyde and water vapour, so as to form a gaseous mixture of products A, containing formaldehyde, water vapour, at least one inert gas diluent, differing from water vapour, and optionally, excess molecular oxygen, and stream of gaseous mixture of products A exits reaction zone A, wherein to reaction gas mixture A passing through reaction zone A, on its path through reaction zone A can optionally be supplied additional molecular oxygen and/or additional inert gas diluent, optionally a stream of gaseous mixture of products A, leaving reaction zone A, is fed into separation zone T*, and in said separation zone T* from gaseous mixture of products A is optionally separated unreacted methanol still contained in gaseous mixture of products A, wherein remains gaseous mixture of products A*, containing formaldehyde, and a stream of gaseous mixture of products A* exits reaction zone A, from stream of gaseous mixture of products A or from stream of gaseous mixture of products A*, as well as at least one other stream of substances containing acetic acid, is obtained a stream of incoming reaction gas mixture B containing acetic acid, water vapour, at least one inert gas diluent, different from water vapour, formaldehyde and optionally molecular oxygen, in which is contained molar amount of acetic acid nHAc greater than molar amount of formaldehyde nFd contained therein, through second reaction zone B, in which is loaded at least one catalyst for aldol condensation B, is passed a stream of incoming reaction gas mixture B, and when passing said reaction zone B formaldehyde contained in supplied reaction gas mixture B, together with acetic acid contained in supplied reaction gas mixture B, under conditions of heterogeneous catalysis is condensed to acrylic acid and H2O, to form a gaseous mixture of products B containing acrylic acid, acetic acid, water vapour, at least one inert gas diluent, different from water vapour, and optionally molecular oxygen, and a stream of gaseous mixture of products B comes out of reaction zone B, wherein to reaction gas mixture B passing through reaction zone B, on its path through reaction zone B, may be supplied additional molecular oxygen and/or additional inert gas diluent, stream of gaseous mixture of products B, leaving reaction zone B is fed into separation zone T, and in said separation zone T is divided at least into three streams substances – X, Y and Z, wherein stream of acrylic acid contained in stream of substances X, is greater than stream of acrylic acid contained in streams of substances Y and Z, taken together, stream of acetic acid contained in stream of substances Y is greater than streams of acetic acid contained in streams of substances X and Z, taken together, stream of inert gas diluent, different from water vapour, contained in stream of substance Z, is greater than streams of inert gas diluent, different from water vapour contained in streams of substances X and Y taken together, and stream of substance Y is returned into reaction zone B and is additionally used for producing incoming reaction gas mixture B.EFFECT: disclosed is a method of producing acrylic acid from methanol and acetic acid.21 cl

ethod of obtaining carbonyl compounds c2-c4 // 2570818
FIELD: chemistry.SUBSTANCE: invention relates to method of obtaining carbonyl compounds, namely ketones and aldehydes C2-C4, which find different application as valuable semi-products of FINE and basic organic synthesis, as well as are widely applied as solvents. Method is carried out in gas phase by interaction of nitrous oxide with mixture of aliphatic C2-C4 olefins and alkanes at temperature 300-550°C and pressure 1-100 atm.EFFECT: method makes it possible to obtain valuable target products with high productivity and high total selectivity with explosion safety of work.12 cl, 4 tbl, 30 ex

ethod of methyl methacrylate purification // 2523228
FIELD: chemistry.SUBSTANCE: invention relates to a method of methyl methacrylate (MMA) purification, which includes realisation of contact of a liquid MMA, containing admixtures, with a sulphonic acid resin in the presence of formaldehyde or an acceptable source of methylene or ethylene of formula I, as is determined below, where R5 and R6 are independently selected from C1-C12 hydrocarbons or H; X represents O; n is an integer number from 1 to 100; and m has a value of 1 or 2, and in which the sulphonic acid resin is optionally, at least, partially, deactivated.EFFECT: method makes it possible to remove admixtures of an aldehyde type, dienes, trienes with high efficiency.18 cl, 20 tbl, 1 dwg, 8 ex

Silver catalyst for obtaining formaldehyde // 2503497
FIELD: chemistry.SUBSTANCE: invention relates to field of catalyst. Described is method of obtaining silver crystals with distribution of average size of particles from 0.15 mm to 2.5 mm and porous coating of oxide materials in which a) silver crystals contact with sol-gel solution of said materials, in solvent, which contains organic solvent and b) obtained as a result silver crystals are collected, c) released from organic solvent and d) then subjected to thermal processing at temperature between 50°C and point of silver melting. Described is application of obtained crystals as catalyst for obtaining formaldehyde.EFFECT: increased activity of catalyst for obtaining formaldehyde.10 cl, 3 dwg, 4 tbl, 1 ex
ethod for direct conversion of lower c1-c4 paraffins to oxygenates // 2485088
FIELD: chemistry.SUBSTANCE: invention relates to a method for direct conversion of lower C1-C4 paraffins to oxygenates such as alcohols and aldehydes, which are valuable intermediate products of organic synthesis and can be used as components of engine fuel and/or starting material for producing synthetic gasoline and other engine fuels. The method involves passing a mixture consisting of a lower paraffin or oxygen, diluted with an inert gas or air or pure oxygen, through a catalyst bed at temperature not higher than 350°C. The catalyst used is a catalyst system for heterogeneous reactions, which contains microfibre of a high-silica support and at least one active element, the active element being in form of either a MeOxHalv composite or a EwMezOxHaly composite, wherein the element Me in both composites is selected from a group which includes transition metals of groups 5-12 and periods 4 and 5, or elements of lanthanum or lanthanide groups or, preferably, ruthenium; element Hal is one of the halogens: fluorine, chlorine, bromine, iodine, but preferably chlorine; element E in the EwMezOxHaly composite is selected from a group which includes alkali, alkali-earth elements, or hydrogen, and indices w, z, x and y are weight fractions of elements in given composites and can vary in the following ranges: z - from 0.12 to 0.80, x - from 0.013 to 0.34, y - from 0.14 to 0.74, w - from 0 to 0.50.EFFECT: method enables to achieve high degree of conversion of starting reactants and high selectivity of formation of alcohols.4 cl, 15 ex
ethod of preparing catalyst for oxidising methanol to formaldehyde // 2458738
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing a catalyst for oxidising methanol to formaldehyde and can be used in production of formaldehyde and urea-formaldehyde resin. The method of producing a catalyst for oxidising methanol to formaldehyde involves reaction of an iron-containing component with molybdenum trioxide with subsequent moulding of granules, drying and calcination, wherein the iron-containing component used is iron oxide, and the reaction is carried out in a mill with impact-shear action and power density 10-200 W/g and weight ratio MoO3:Fe2O3=(80-40):(20-60).EFFECT: use of the invention increases specific surface area by 51-84%, mechanical strength by 60-68%, and cuts the number of process operations twofold.1 cl, 1 tbl, 3 ex

ethod of producing isoprene, isobutylene and formaldehyde // 2436756
FIELD: chemistry.SUBSTANCE: invention relates to a method of decomposing high-boiling by-products of production of isoprene from isobutylene and formaldehyde by mixing high-boiling by-products with superheated water vapour and contact with a catalyst in one or two deck-type reactors while heating to obtain isoprene, formaldehyde and isobutylene, characterised by that liquid high-boiling by-products are first evaporated and superheated to temperature 300-350°C together with water vapour in ratio 1:1.0-1.2 in the convection part of a vapour-superheating furnace in a system of straight pipes fitted with a self-contained collector, and then mixed in a mixer with superheated water vapour to weight ratio 1:3.0-4.0, and then fed at 400-450°C into a reactor, in the over-catalyst zone of which there is a clearing-distribution grid with common clear area of 15%, having 20 mm holes and caps with diameter of 100 mm and height of 80 mm.EFFECT: use of the present method enables to loser specific consumption of water vapour when splitting high-boiling by-products with simultaneous increase in output of desired products.2 cl, 3 ex, 1 dwg

ethod and apparatus for homogeneous oxidation of methane-containing gas // 2426715
FIELD: chemistry.SUBSTANCE: invention relates to a method for homogeneous oxidation of a methane-containing gas, involving feeding into the cycle a methane-containing gas preheated to 430-450°C in at least three series-arranged oxidation reactors made from carbon steel. Each of the reactors, except the last, is separately connected to exhaust-heat boilers. Oxygen is also fed into the reactors in such an amount that a mixture forms outside the explosive range, which causes homogeneous oxidation of the methane-containing gas while simultaneously raising temperature of the gas mixture to 540-560°C. Subsequent quenching-cooling of the gas mixture is carried out in exhaust-heat boilers to temperature 440-450°C by feeding water into the exhaust-heat boilers where vapour is formed, which is fed into fractionation columns for separating end products. Further, the reaction mixture from the last reactor which is not connected to an exhaust-heat boiler enters a separator. On he way to the separator, the reaction mixture heats the gas and some of its heat is used to obtain water vapour, which is mixed with vapour from the heat-exchange boilers. From the separator, the liquid phase enters the fractionation step where methanol rectificate is obtained, as well as ethyl alcohol and formaldehyde. The gaseous phase goes absorbers for removal of SO2, CO and CO2. In the first absorber, the gaseous phase is purified from SO2 and from CO and CO2 in the second absorber, followed by extraction of said gases from the absorption solution of the second absorber in a desorber. Liquid phase outlets of the absorbers are connected to collectors to facilitate reclamation of absorbing solutions with separation and outlet of CO and CO2 fractions from the desorber. Outlets of the collectors are connected to inlets of the absorbers for feeding the formed solutions for removing SO2, CO and CO2 from the gas. While cleaning the gas phase, the circulation cycle is partially blown in order to remove inert gases, for example nitrogen and argon entering the cycle together with the methane-containing gas and oxygen. The number of blows is determined by the amount of inert gases available in the cycle. After purification and blowing, the cycle is closed by injecting the gaseous phase which consists of methane-containing gas and gas from the second absorber. The invention also relates to apparatus for homogeneous oxidation of methane-containing material.EFFECT: high efficiency during operation and high output of the obtained product, as well as high environmental friendliness.2 cl, 1 tbl, 1 dwg

ethod and apparatus for producing methanol with hydrogen recirculation // 2423341
FIELD: chemistry.SUBSTANCE: present invention relates to a method of producing methanol, involving feeding a first stream of hot hydrocarbon-containing gas into a reactor, feeding an oxygen-containing gas into the reactor, oxidation of the hot stream of hydrocarbon-containing gas in the reactor with oxygen from the oxygen-containing gas to form a stream of products containing methanol and formaldehyde; and transferring heat from the stream of products to the first stream of hydrocarbon-containing gas, extracting methanol from the stream of products and extracting CO2 and formaldehyde from the stream of products to form a reduced stream of products containing hydrocarbons through physical absorption thereof with an absorbent, wherein the first stream contains at least a portion of the reduced stream of products, as well as apparatus (versions) for realising said method.EFFECT: invention enables to obtain an end product using an efficient and cheap method.32 cl, 5 dwg

ethod of producing formaldehyde // 2404959
FIELD: chemistry.SUBSTANCE: invention relates to a method of producing formaldehyde through dehydrogenation of methanol in the presence of an oxide Zn-Na containing catalyst at high temperature. Dehydrogenation of methanol is carried out through chemical conjugation in the presence of hydrogen peroxide taken in an amount which ensures its concentration in methanol of 0.8-1.5%, and in the presence of a catalyst which also contains silicon dioxide with the following initial composition of components, wt %: Na2O - 1.2-1.4; ZnO - 0.8-1.2; SiO2 - the rest, at 790-900°C, mainly at 820-850°C.EFFECT: invention enables to carry out the process with high formaldehyde output of the catalyst and longer life of the catalyst.2 cl, 6 ex

ethod of obtaining formaldehyde raw material with low water content // 2338737
FIELD: chemistry.SUBSTANCE: invention pertains to the method of obtaining formaldehyde raw material, which involves separation of the contained formaldehyde product from a formaldehyde solution, water and methanol, where the contained formaldehyde product has considerably lower content of water than the formaldehyde solution. Separation is done by distillation of the formaldehyde solution in the presence of a water absorbing compound. The water absorbing compound is chosen from a group, consisting of saturated or unsaturated carboxylic acid, ester and carbonyl compound.EFFECT: allows for obtaining a formaldehyde product with low water content.8 cl, 1 dwg, 2 ex

ethod of uninterrupted production of formalin and carbamide-formaldehyde concentrate // 2329248
FIELD: chemistry.SUBSTANCE: invention pertains to the method of uninterrupted production of formalin and carbamide-formaldehyde concentrate. The method involves catalytic dehydrogenation of methanol with formation of formaldehyde-containing contact gases, in which there is separation of part of the formaldehyde in form of formalin, supply of contact gases for chemisorption of formaldehyde by a water solution of carbamide, obtaining of carbamide-formaldehyde concentrate with calculated molar ratios of formaldehyde to carbamide of (4.5-5.2):1. Separation of part of the contact gases in form of formalin is made by cooling the contact gases of dehydrogenation of methanol to temperature lower than the dew point of 50-80°C. The resulting condensate is removed in form of formalin, and the remaining part of contact gases is taken for chemisorption.EFFECT: method increases quality and stabilisation of the mixture of formalin and carbamide-formaldehyde concentrate and simplifies the process.1 dwg, 4 ex

ethod for preparing glyoxal-containing products // 2321577
FIELD: chemical technology.SUBSTANCE: invention relates to a method for continuous synthesis of glyoxal-containing products of the desired concentration in a single-step technological cycle. Method involves vapor-phase catalytic process of partial oxidative dehydrogenation of ethylene glycol with oxygen diluted with steam and nitrogen in the mole ratio from 1/6.5 to 1/13.0 at temperature 400-700°C on carrier Ag-contacts and massive Ag-catalysts made of materials of electrolytic origin of particles size 0.1-4.0 mm. Then the process involves continuous the vat-less separation of vapor-gaseous oxidate for liquid fractions and gaseous phase wherein prepared aqueous aldehyde solutions contain 4-40% of glyoxal, 6.2% of glycolic aldehyde, not above, 4.6% of formaldehyde, not above, 4.0% of ethylene glycol, not above, at the total acidity index 2%. The end product comprises 39.8% of glyoxal, 5.5% of glycolic aldehyde and 0.4% of formaldehyde. The process of continuous the vat-less separation of synthesis products for glyoxal-containing liquid fractions and depleted gaseous phase is carried out continuously in the range of temperature 10-400°C as result of subcontact cooling in combination with three-step combined condensation of components of vapor-gaseous oxidate in a cascade block-unit in fractional isolation of liquid and gaseous products of synthesis, and in regulation of heat regimen of the combined condensation and change of the ratio of liquid fractions.EFFECT: improved method of synthesis.1 dwg, 13 ex

ethod for production of methanol solution of formaldehyde, c2-c4-alcohols and synthetic diesel fuel and device // 2318795
FIELD: organic chemistry, fuel production.SUBSTANCE: claimed method includes feeding of heated hydrocarbon-containing and oxygen-containing gas in reaction unit, vapor phase oxidation of hydrocarbon-containing gas at 250-450°C and pressure of 2.0-10 MPa under near isothermal conditions; cooling of reaction mixture in heat exchangers, separation of gas and liquid phases of reaction mixture. separation of obtained methanol solution of formaldehyde, C2-C4-alcohols and methanol, methanol and gas phase after separation into reactors; catalytic methanol conversion on zeolite catalyst at 350-450°C and pressure of 3-8 MPa; cooling of produced reaction mixture in heat exchangers; separation of gas and liquid phases of reaction mixture; separation of aqueous fraction and synthetic diesel fuel liquid fractions, including fraction of liquid hydrocarbons, corresponding to motor gasoline having octane number of at least 92.EFFECT: products of high quality; simplified technology; decreased energy consumption.5 cl, 1 tbl

Process for producing formalin or urea-formaldehyde solution // 2287517
FIELD: industrial organic synthesis.SUBSTANCE: process comprises providing alcohol-water-gas mixture via evaporation of water-methanol mixture, combining the latter with air and emission gas, catalytic dehydrogenation of methanol on silver catalyst at elevated temperature followed either absorption of formaldehyde from reaction gases or chemisorption thereof from indicated gases with urea solution in column to produce and recover formalin in case of absorption or urea-formaldehyde solution in case of chemisorption. Into absorption/chemisorption stage, preheated emission gas is supplied in weight proportion to methanol (0.25-6,8):1. Generally, emission gas is preheated to 50-130°C.EFFECT: increased concentration of produced formalin or urea-formaldehyde solution, widened concentration control range, simplified equipment, and reduced fire risk.2 cl, 1 dwg, 4 ex

ethod for formaldehyde production // 2283829
FIELD: organic chemistry, in particular formaldehyde production.SUBSTANCE: claimed method includes oxidation of hydrocarbon-containing gas with oxygen-containing gas at elevated temperature and pressure followed by reaction mixture cooling and separation of target liquid product. As hydrocarbon-containing gas ethane-containing gas is used, including natural and associated gases containing not less than 10 % of ethane. Ethane-containing gas preliminary pressed up to 2-5 MPa and heated up to 280-450°C, and oxygen-containing gas, preliminary pressed up to pressure of ethane-containing gas or more are separately fed into blenders of arranged in tandem reaction zones up to oxygen content of 2-10 vol.%. Reaction mixture is continuously cooled through wall either directly in oxidation process or before feeding thereof in next reaction zone to temperature not more than 450°C. As oxygen-containing gas air, oxygen or oxygen-enriched air are used.EFFECT: increased formaldehyde yield, simplified process, decreased energy consumption.2 cl, 4 ex, 1 tbl, 1 dwg

Process of producing liquid oxygenates via conversion of natural gas and installation to implement the same // 2282612
FIELD: industrial organic synthesis and chemical engineering .SUBSTANCE: invention relates to a process of producing liquid oxygenates, including methanol, C2-C4-alcohols, formaldehyde, lower organic acids, or mixtures thereof, and to installation for implementation the process. Process comprises successively supplying natural gas from complex gas preparation plant to a series of "gas-gas" heat exchangers and into annular space of at least one tubular reaction zone of reactor, wherein natural gas is heated to temperature of the beginning of reaction, whereupon heated gas is passed to the entry of the tubular reaction zone mixer, into which compressed air or oxygen is also injected to provide gas-phase oxidation in reaction zone of reactor. Resulting reaction mixture is discharged from reactor into a series of "gas-liquid" and "gas-gas" heat exchangers, wherein reaction mixture is cooled to ambient temperature and sent to separator, wherefrom liquid phase is passed through lower carboxylic acid recovery vessel to the system of rectification columns to isolate the rest of mixture components, whereas leaving gas is recycled to complex gas preparation plant. More specifically, oxidation is carried out within temperature range 240 to 450°C and pressure from 2 to 10 MPa at residence time of reaction mixture in reactor 2-6 sec and oxidant concentration 2 to 15 wt %. In reactor having mixers hollow and at least one tubular reaction zones, required temperature is maintained constant throughout all length of tubular reaction zone and at entries for compressed air or oxygen in mixers of each of tubular reaction zones and hollow reaction zone. Liquid oxygenate production plant is composed of aforesaid complex gas preparation plant, a series of "gas-gas" heat exchanger to heat natural gas, reactor, a series of "gas-liquid" and "gas-gas" heat exchangers to cool reaction mixture obtained in reactor, gas-liquid separator, lower carboxylic acid recovery vessel, and system of rectification columns to isolate the rest of products.EFFECT: enabled implementation of the process directly near gas and gas condensate deposits, increased conversion of methane per one passage through reactor, and increased yield of oxygenates due to improved design of plant.6 cl, 1 dwg, 1 tbl

Formaldehyde production process // 2267479
FIELD: industrial organic synthesis.SUBSTANCE: formaldehyde is produced via oxidative dehydrogenation of methanol with air oxygen at high temperature on silver-containing in fixed-bed reactor enclosing gas stream distributor followed by absorption of resultant reaction gases to form methanolic formalin, which is further rectified. Gas stream distributor utilized is inert filling composed of geometrically shaped members 3-10 mm in diameter placed on grid mounted upstream of catalyst in the form of a bed 50 to 500 mm thick.EFFECT: increased conversion and selectivity of process.1 dwg, 4 ex

The regeneration method of a silver catalyst preparation of formaldehyde // 2242281
The invention relates to the chemical industry, in particular to methods of regeneration of silver catalysts for the preparation of formaldehyde from methanol

The method of producing formaldehyde // 2233263
The invention relates to the technology of organic synthesis, and in particular to an improved process for the preparation of formalin used in chemical industry, medicine and agriculture

The method of dehydration // 2232744
The invention relates to an improved method of dewatering solution of formaldehyde containing formaldehyde, water and methanol, including the distillation of the specified solution of formaldehyde in the presence of exciting water connection with obtaining the formaldehyde-containing product that contains significantly less water than the original solution, and use a solution of formaldehyde containing methanol at a molar ratio of methanol to formaldehyde 0.3 to 1.5:1, obtaining the formaldehyde-containing product in the form of a complex with methanol

Processing formaldehydefree mixtures // 2217413
The invention relates to an improved method for the removal of formaldehyde or its adducts of organic liquid mixtures obtained in the production of methyl methacrylate containing at least a carboxylic acid or an ester of carboxylic acid and formaldehyde or its adducts, which forms a two-phase mixture of water, comprising at least one extraction liquid organic mixture in the system liquid-liquid using water as the extractant with getting the flow of the organic phase and flow of the aqueous phase, and the flow of the organic phase contains significantly reduced the concentration of formaldehyde or its adducts compared with the liquid organic mixture

The method of obtaining monomeric formaldehyde // 2114817
The invention relates to a method of obtaining from semiformal Monomeric formaldehyde high purity, used as a monomer in the production of high molecular polyacetylenic resins, as well as in the synthesis of numerous organic compounds based on it
The method of preparation of the reactor for the preparation of formaldehyde // 2094422
The invention relates to the field of chemical technology and can be used in the manufacture of formaldehyde in the chemical, petrochemical and other industries
The method of producing formaldehyde // 2094421
The invention relates to the field of chemical technology and can be used in the manufacture of formaldehyde in the chemical, petrochemical, etc
Catalyst for the preparation of formaldehyde // 2089286
The invention relates to the petrochemical industry, in particular to catalysts for the preparation of formaldehyde by the oxidation of natural and associated petroleum gas
The method of producing formaldehyde // 2081104
The invention relates to the oil and gas industry, in particular to the field of utilization of associated petroleum gas, namely the technology of obtaining of formaldehyde in aqueous formalin solution

The method of automatic control of the process of obtaining formalin // 2058289
The invention relates to the field of automation of production processes and can be used in chemical industry for automation systems for the production of formalin

The method of obtaining monomeric formaldehyde // 2053216
The invention relates to methods of producing Monomeric formaldehyde via thermal decomposition of alcohols semiformally

The method of producing formaldehyde // 2051894
The invention relates to organic chemistry, in particular to methods for formaldehyde, and can be used in the chemical industry
 
2551036.
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