Vanillin (C07C47/58)

ethod for alcoxyphenol and alcoxyhydroxybenzaldehyde production // 2628525
FIELD: chemistry.SUBSTANCE: method for alkoxyphenol production comprises O-alkylation of at least one hydroxyphenol to form at least one alkoxyphenol, at that, the said reaction is carried out using an O-alkylating agent, an aqueous solvent containing a Bronsted base and an organic solvent with a base/O-alkylating agent ration in the range of 0.5 to 1.5 moles of base per mole of O-alkylating agent, with an O-alkylating agent/hydroxyphenol ratio in the range of 0.5 to 2 moles of O-alkylating agent per mole of hydroxyphenol and with an organic solvent/hydroxyphenol ratio of less than 280 ml, preferably in the range of 10 to 250 ml and more preferably in the range of 50 to 150 ml of an organic solvent per mole of hydroxyphenol. One of the versions of the alkoxyhydroxybenzaldehyde production method comprises preparation of alkoxyphenol from hydroxyphenol by the foregoing method and a reaction of the aldehyde group addition to the resulting alkoxyphenol to obtain the corresponding alkoxyhydroxybenzaldehyde, preferably by condensation reaction between alkoxyphenol and glyoxylic acid, followed by oxidation of the resulting compound.EFFECT: proposed method for alkoxyphenol production allows the desired product to be obtained in good yield and high purity with high conversion of initial hydroxyphenol.11 cl, 3 dwg, 7 ex

ethod of producing vanillin electrochemical oxidation of aqueous solutions or suspensions lignin // 2600322
FIELD: food industry.SUBSTANCE: invention relates to a method of vanillin producing. Method involves electrochemical oxidation of aqueous lignin-bearing suspension or solution on the anode, wherein a silver electrode is used as anode.EFFECT: using this invention enables to obtain vanillin with higher output and selectivity in conditions, facilitating less corrosion of electrodes, that enables to obtain less contaminated vanillin.15 cl, 10 ex, 1 tbl
ethod of production of aroma compound including compound of two solid substances having organoleptic properties // 2565721
FIELD: metallurgy.SUBSTANCE: invention relates to the method of production of the aromatic powder compound characterised by the melt point Tm exceeding or equal to 30°C. Separately to the mixer at least two main powder simple solid substances with the organoleptic properties are supplied, their melt point exceeds or is equal to 40°C. The mixer chamber was pre-heated to temperature below Tm. The said solid substances are mixed in the mixer upon absence of any external liquid phase at temperature below Tm. At least, one of the said powder solid substances is supplied to the said mixer at temperature Ti selected such that T-20°C≤Ti≤T+20°C. Mixing is performed under isothermal conditions at temperature set to the specified temperature. The said aromatic powder compound is removed.EFFECT: aromatic compound is characterised by the required size of particles without use of the grinding stage, has improved fluidity and has no caking during storage.15 cl, 3 ex
ethod of vanillin manufacturing // 2519550
FIELD: chemistry.SUBSTANCE: method consists in air oxygen oxidation of lignin, obtained by fermentative hydrolysis of wood of coniferous species or wood, affected by brown or mottled rot, with content of lignin 40-90 wt % in water-alkali medium at higher temperatures and pressure. The process is carried out in presence of catalysts on the basis of copper hydroxide with continuous supply of alkali solution into reactor for 1-150 minutes.EFFECT: method makes it possible to reduce alkali consumption counted per a kilo of obtained vanillin, and consumption of fermentative lignin, which reduces amount of organic substance, formed as byproducts, in sewage water and improves ecological compatibility of the process.10 ex

ethod of purifying vanillin obtained from lignin oxidation products // 2494085
FIELD: chemistry.SUBSTANCE: invention relates to a method of purifying vanillin obtained from lignin oxidation products, by reacting vinillin-containing extracts with aqueous solutions sodium bisulphite, followed by decomposition of the vanillin-bisulphite derivative. The method is characterised by that the vanillin-bisulphite derivative is heated in an autoclave to 120-170°C, the vapour-gas phase is released and vanillin is extracted from the obtained mixture or solution, followed by recycling the obtained aqueous solution of sulphurous anhydride and sodium sulphate into a solution of sodium bisulphite.EFFECT: method enables to avoid the use of sulphuric acid and alkali when purifying vanillin, widely used in food, perfume, cosmetic and pharmaceutical industry.5 ex

ethod of separating vanillin from lignin oxidation products // 2479568
FIELD: chemistry.SUBSTANCE: present invention relates to a method of separating vanillin, which is widely used in food, perfume-cosmetic and pharmaceutical industries, from lignin oxidation products by reacting vanillin-containing extracts with aqueous sodium hydrosulphite NaHSO3 solutions. The solutions used have sodium hydrosulphite concentration of 320-400 g/l and the vanillin-hydrosulphite derivative formed is separated from excess sodium hydrosulphite solution in form of a precipitate by filtration, centrifuging or decantation.EFFECT: method enables to cut consumption of sodium hydrosulphite and increases the distribution ratio of vanillin into the precipitate and aqueous phase from the organic phase, which reduces the volume of extracts and re-extracts when separating vanillin.3 ex
ethod of extracting ortho-vanilin and iso-vanilin from aqueous solutions // 2422430
FIELD: chemistry.SUBSTANCE: invention relates to a method of extracting ortho-vanilin and iso-vanilin from aqueous solutions. The method involves addition of a salting-out agent - sodium chloride to aqueous solutions of ortho-vanilin and iso-vanilin and a solution of polyvinyl caprolactam prepared beforehand, having concentration of 5-15 wt % until achieving 34-35 wt % content of salt in the solution, with volume ratio of the aqueous phase to organic phase equal to 10:1. The organic phase is extracted and separated, analysed spectrophotometrically and the recovery ratio (R, %) of ortho-vanilin and iso-vanilin is calculated using the formula: R=D·100/(D+r), where D is coefficient of distribution of ortho-vanilin and iso-vanilin between the solution of polyvinyl caprolactam and the aqueous solution, r is the ratio of equilibrium volumes of the aqueous and organic phases.EFFECT: method increases recovery ratio of ortho-vanilin and iso-vanilin from aqueous solutions.1 tbl, 2 ex
ethod of extracting vanilin, ethylvanilin, isovanilin and orto-vanilin from water solutions // 2352553
FIELD: chemistry.SUBSTANCE: method of extracting vanillin, ethylvanillin, iso-vanillin and ortho-vanillin from water solutions is characterised by the following: preliminarily to water solutions of vanillin, ethylvanillin, iso-vanillin and ortho-vanillin added are; ammonium sulphate, until its content in solution is 42-43% to solution weight, and preliminary prepared mixture of solvents, consisting of 22-23 wt % acetone and 78-77 wt % diacetone alcohol, then extraction is carried out with molar ratio of water and organic phases 10:1, and degree of vanillins extraction (R,%) is calculated by formula: R=D-100/(D+r), where D is coefficient of vanillins distribution between solvent mixture and water-salt solution, r is ratio of equiweight volumes of water and organic phases.EFFECT: increase of degree of vanillin, ethylvanillin, iso-vanillin and ortho-vanillin extraction from water solutions.1 tbl, 2 ex
ethod of vanillin and lilac aldehyde extraction // 2348606
FIELD: chemistry.SUBSTANCE: vanillin is applied in confectionery, pharmaceutics and manufacturing of perfume and cosmetics, and lilac aldehyde is applied in manufacturing of trimetoprim, biseptol and other pharmaceutical drugs. Method involves extraction by oxygen-containing extraction agents at pH 6.0-8.0 and re-extraction by water alkaline solution at pH 10-14. Extraction stage involves use of tributhylphosphate, or kerosene solutions of tributylphosphate with 40-99 wt % of tributylphosphate, as extraction agents.EFFECT: reduced volume of extraction agent required at extraction stage in comparison to existing technique.7 ex
The method of processing wood small-leaved species into valuable organic products // 2219048
The invention relates to a method for products of fine organic synthesis of vanilla, lilac aldehyde, levulinate acid

The method of obtaining 4-hydroxybenzaldehyde and its derivatives // 2194032
The invention relates to a new method of obtaining 4-hydroxybenzaldehyde and its derivatives, in particular for the preparation of 3-methoxy-4-hydroxybenzaldehyde (vanilla) and 3-ethoxy-4-hydroxybenzaldehyde (ethylvanillin)

ethod for preparation of aromatic aldehydes // 2179968
The invention relates to the chemical processing of wood components, specifically to an improved process for the preparation of vanillin and lilac aldehyde, which find wide application in the production of a large number of medicines, in the synthesis of polymers

The method of processing wood of coniferous breeds // 2178405
The invention relates to a method for producing vanillin and lilac aldehyde products of fine organic synthesis
The method of selection of vanilla and lilac aldehyde // 2177935
The invention relates to the field of fine organic synthesis, namely the method of selection of vanilla and lilac aldehyde from a solution obtained by oxidation lignindegrading raw materials by extraction of the high-boiling alcohols or esters having a boiling point of more than 130oSince at pH 6-8 with further reextracting aqueous-alkaline solution at pH 10 to 14 and the release of vanillin by acidification with sulfuric acid to pH 5

A method of producing vanillin // 2175314
The invention relates to the field of chemical processing of wood components, namely, to obtain vanillin by oxidation lignostone the material with oxygen in an alkaline medium in the presence of ortho-phenanthroline and isaignani formulawhere L is the polymer matrix Kraft lignin under heating, followed by acidification oxidate to pH 2

ethod for preparation of aromatic aldehydes // 2165920
The invention relates to a thin organic synthesis, specifically to a technology for aromatic aldehydes

ethod for preparation of aromatic aldehydes from lignostone raw materials // 2164511
The invention relates to a thin organic synthesis, specifically to a technology for aromatic aldehydes from lignostone raw materials

The method of chemical processing of wood // 2158192
The invention relates to the field of fine organic synthesis, particularly to a technology of obtaining vanillin, levulinate acid and 5-oxymethylphenyl wood

3 phenylazo-4-hydroxybenzylideneamino as activator of the alkaline hydrolysis of lignin // 2132328
The invention relates to the field of organic processing lignin, specifically to an improved process for the preparation of aromatic aldehydes from lignin
The method of processing wood into products of fine organic synthesis // 2119427
The invention relates to the field of fine organic synthesis, specifically to a technology for vanilla, lilac aldehyde, levulinate acid from wood

The oxidant lignosulfonate to vanilla // 2117655
The invention relates to the chemical processing of wood components, namely obtaining vanillin, which finds wide application in the food industry and the production of medicines

A method of producing vanillin // 2117654
The invention relates to the field of chemical processing of wood components, namely, obtaining vanillin, which is widely used in the food industry in the manufacture of pharmaceutical preparations

ethod for aromatic oxyaldehydes // 2078755
The invention relates to chemical processing of lignin, namely the method of production of vanilla and lilac aldehyde, which find wide application in the production of medical drugs, cosmetics and food industry

ethod of extraction of vanillin // 2078754
The invention relates to chemical processing of lignin, and in particular to methods selection of vanilla, which finds wide application in the production of medical drugs in the food and perfume industry
ethod of extraction recovery of vanillin from aqueous solutions // 2059601
The invention relates to a thin organic synthesis, and is intended to improve existing processes of obtaining vanillin (4-hydroxy-3-methoxybenzaldehyde) from lynnster - containing products, for example, lignosulfonates

The method of separation of vanilla and lilac aldehyde // 2059600
The invention relates to a thin organic synthesis, and is intended to improve the joint production of vanillin (4-hydroxy-3-methoxybenzaldehyde) and lilac aldehyde (4-hydroxy-3,5-dimethoxybenzaldehyde) from the lignin-containing raw material

ethod of extraction of vanillin from alkaline solutions // 2058291
The invention relates to the field of fine organic synthesis, and is intended to improve existing processes of obtaining vanillin (4-hydroxy-3-methoxybenzaldehyde) of the lignosulfonate

ethod for aromatic oxyaldehydes // 2057112
The invention relates to the chemical processing of wood components, specifically to an improved process for the preparation of vanillin and syring aldehyde, which find wide application in the production of a large number of medicines, in the synthesis of polymers
The method of selection of vanilla and lilac aldehyde // 2055831
The invention relates to a thin organic synthesis, and is intended to improve existing processes of obtaining vanillin (4-hydroxy-3-methoxybenzaldehyde) from lignin products of wood processing, such as lignosulfonates

The oxidizing mixture // 2052449
The invention relates to the field of chemical processing of wood components, namely the extraction of aromatic aldehydes, specifically syring aldehyde and vanillin formed during the oxidation of lignins of hardwoods and finds application in the production of a large number of drugs, such as trimethoprim
 
2551187.
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