80 results about "Glycolaldehyde" patented technology

The present invention provides a method for the production of glycolaldehyde with high specificity. The hydrous thermolysis consists of the spraying of aqueous sugar solutions containing from 25 to 80% of water but preferably 30 to 60% water, as a fine mist into a reactor held at the between 500 and 600° C., but preferably between 520 and 560° C. and the condensation of the resulting vaporous product in a surface condenser with optional heat recovery. The residence time of the vaporous product in the reactor should be in the range 0.1–5 seconds, but preferably in the range 0.5 to 2 seconds. Aldose monomeric sugars, preferably glucose (also known as dextrose), are preferred for use in the aqueous solution. The yield of glycolaldehyde in the condensed liquid is minimum 50% by weight of the sugar fed for glucose solutions.

A process for the production of lactic acid and 2-hydroxy-3-butenoic acid or esters thereof by conversion of glucose, fructose, sucrose, xylose and glycolaldehyde dissolved in a solvent in presence of a solid Lewis acidic catalyst.

Methods of converting cellulose or related biorenewable carbohydrate materials into high-value chemical compounds. The methods provide a means of converting low-cost materials such as cellulose and biomass into high yields of compounds such as ethylene glycol, propylene glycol, glycerin, methanol, hydroxyacetone, glycolaldehyde and dihydroxyacetone.

A process for reducing the percentage by weight of formaldehyde present in a composition comprising glycolaldehyde, wherein formaldehyde is transformed into one or more formaldehyde acetal(s) and removed from the reactive distillation reaction solution by reactive distillation in the presence of at least one alcohol and a catalyst.

Disclosed are processes for the preparation of glycolaldehyde in which formaldehyde is contacted with carbon monoxide and hydrogen in the presence of a rhodium catalyst and a solvent containing at least one N,N-dihexylbutyramide. The glycolaldehyde product is recovered by extraction with water. The process provides high selectivity to glycolaldehyde and efficient separation of hydroformylation products from the solvent and rhodium catalyst.

The invention discloses a corynebacterium glutamicum engineering strain for biosynthesis of rare sugar, and a building method and application thereof, and discloses a corynebacterium glutamicum recombination strain SY10. An experiment proves that rare ketose and deoxidized ketose can be synthesized by adopting a plurality of hydroxyaldehydes and glucoses as substrates by the strain in a fermentation manner, for example, D-erythrulose can be synthesized by adopting formaldehyde and glucose as substrates, L-xylulose can be synthesized by adopting glycolaldehyde and glucose as substrates, D-sorbose and D-psicose can be synthesized by adopting D-glyceraldehyde and glucose as substrates, L-fructose can be synthesized by adopting L-glyceraldehyde and glucose as substrates, and 3R, 4S, 5R, 6R-heptose and 3R, 4R, 5R, 6R-heptose can be synthesized by adopting D-erythrose and glucose as substrates. Therefore, the corynebacterium glutamicum recombination strain SY10 disclosed by the invention can be applied to the field of production of the rare ketose and the deoxidized ketose by whole-cell fermentation; the produced rare ketose and deoxidized ketose have broad application prospects in the industries such as a food, a medicine and the like.

The invention discloses an online-controllable-atmosphere feedback device for preparing glycolaldehyde by using synthesis gas and an application thereof, and belongs to the technical field of glycolaldehyde production. The device comprises a gas control system A, a pressurization system B, a reaction kettle system C, an analysis system D and a central processing system E. The device solves the technical problems of a conventional high pressure reaction device for preparing glycolaldehyde by using synthesis gas: 1, the raw material gas proportion is relatively fixed, the change period is long, and the raw material gas proportion cannot be adjusted targetedly according to a rhodium precursor component; 2, the reaction evaluation data analysis period is long, and adjustment and change of the raw material gas proportion of the reaction process cannot be timely fed back and guided; and 3, gas ways are frequently dismantled, potential safety hazards are increased, and the work is tedious.

The invention belongs to the technical fields of chemistry and chemical engineering and in particular relates to a method for synthesizing low-impurity content glyoxal through gas phase catalytic oxidation. The method comprises the following steps: taking crystallized silver prepared by an electrolytic process as a carrier; performing high-temperature treatment, performing metal deposition, drying and roasting to obtain crystallized silver containing copper-silver alloy particles; taking the crystallized silver loaded with the copper-silver alloy particles as a catalyst, carrying out an oxidizing reaction among ethylene glycol, oxygen, water and inert gases to generate glyoxal in the presence of a catalyst. The 40 percent of glyoxal aqueous liquid in which the formaldehyde content is less than 500ppm and the glycolaldehyde content is less than 0.5 percent is directly obtained by performing air oxidation on ethylene glycol. The catalyst is easily regenerated and can be regenerated with a similar electrolytic silver method, and the prepared glyoxal is high in product quality.

Methods of converting cellulose or related biorenewable carbohydrate materials into high-value chemical compounds. The methods provide a means of converting low-cost materials such as cellulose and biomass into high yields of compounds such as ethylene glycol, propylene glycol, glycerin, methanol, hydroxyacetone, glycolaldehyde and dihydroxyacetone.

The invention discloses exterior wall emulsion paint and a preparation method thereof. The exterior wall emulsion paint is composed of the following raw materials by weight: 100-150 parts of styrene-acrylic emulsion, 120-160 parts of hydrated magnesium silicate superfine powder, 180-240 parts of sienna stone powder, 40-60 parts of titanium dioxide, 80-120 parts of composite nano powder, 3-6 parts of ethanediol, 1-3 parts of glycolaldehyde, 0.5-1.5 parts of dodecyl dimethyl benzyl ammonium chloride, 2-4 parts of sodium hydroxypropyl oxidized starch succinate, 3-5 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 0.5-1.5 parts of a multi-functional additive AMP-95, 4-6 parts of a dispersant HT-5000, 1-2 parts of a moistening agent SF-2, 2-3 parts of a thickening agent MS-1, 1-2 parts of a polyurethane rheological agent HT-860, 0.5-1 part of a defoaming agent HT-6520 and 250-350 parts of water. The exterior wall emulsion paint has excellent weather resistance, water resistance, stain resistance and adhesion resistance, does not crack, peel off, shell or change color by being exposed to air for a long time, is durable in use, is safe and non-toxic, has no pollution, and is suitable for decoration of building exterior walls.

A process for making ethylene glycol by feeding reactants including 1,2-dioxygenated organic compounds, an organometallic homogeneous catalyst, and hydrogen to a hydrogenation reactor, reacting at least a portion of the reactants with hydrogen in the presence of the organometallic homogeneous catalyst to produce a reaction product mixture containing ethylene glycol, and passivating the catalyst by contacting the catalyst with a carbon monoxide to thereby suppress the formation of by-product diols other thatn the ethylene glycol primary product, and suppress the formation of by-product tetrols and by-product glycolaldehyde acetals; and separating at least a portion of the ethylene glycol from the reaction product mixture.

The invention provides a manufacturing method of formaldehyde, glycolaldehyde and glycol. According to the manufacturing method of formaldehyde and glycolaldehyde, methanol is subjected to a reaction in the presence of a catalyst composition, so as to form formaldehyde and glycolaldehyde; and formaldehyde and glycolaldehyde are used as intermediate products to synthesize glycol. The catalyst composition contains a rhodium catalyst and a ruthenium catalyst, and the process of forming glycol by the reaction of methanol is carried out at the temperature of 50-150 DEG C and at the pressure of 0-40 kg/cm<2>G. The same catalyst composition is used by the manufacturing method of formaldehyde, glycolaldehyde and glycol. After the end of a reaction in the last manufacturing process, a reaction in the next manufacturing process can be carried out in a same high-pressure reactor. According to the manufacturing method of glycol, manufacturing processes can be simplified, manufacturing time can be minimized, and manufacturing costs of glycol can be reduced more sharply.

The invention discloses a brewing yeast strain capable of metabolizing xylose. The strain is a brewing yeast (Saccharomyces cerevisiae) BSHH02B, and is preserved in the China General Microbiological Culture Collection Center (CGMCC) on Feb. 8th, 2012, wherein the preservation number is CGMCC No. 5747. The strain carries a unique xylose metabolizing way, i.e. a molecular xylose generates a molecular pyruvic acid and a molecular glycolaldehyde through two mesostate, i.e. xylonic acid and 3-deoxyl-D-glycerol-ketopentose acid. By the xylose metabolizing way, the brewing yeast BSHH02B can quickly grow by using the xylose under an aerobic condition, and can be applied to the production of chemical products by using xylose-containing raw materials, wherein the chemical products include ethanol, glycol, carboxylic acid and the like.

A process for preparing ethylene glycol comprising: forming intermediums of formaldehyde and glycolaldehyde to synthetize ethylene glycol by reacting methanol with methanol in the presence of a catalyst composition comprising rhodium catalysts and ruthenium catalysts at a temperature between 50-150° C. and a pressure between 0-40 kg/cm²G.

The invention relates to a method for preparing glycolaldehyde through hydroformylation of formaldehyde. The method comprises the following steps: mixing a substrate, a rhodium source and a metal additive, adding the mixture and a solvent into a high-pressure kettle to obtain a reaction solution, then introducing synthesis gas, reacting for 0.5-12 hours at 60-150 DEG C, and cooling to obtain glycolaldehyde, the substrate is formaldehyde or paraformaldehyde; the synthesis gas is composed of hydrogen and carbon monoxide. According to the invention, through the synergistic effect of two metals in the bimetallic catalyst, high glycolaldehyde yield, fast reaction rate and reaction cost reduction are realized; the reaction system is simple, the reaction activity is obviously improved, and the precious metal consumption is greatly reduced.

The invention provides a method for biosynthesizing L-xylose. The method is characterized in that aldolase, such as D-fructose-6-phosphate aldolase (FSA), is used for converting substrates formaldehyde and glycolaldehyde into the L-xylose; or a combination of glycolaldehyde condensing enzyme (GALS), a mutant thereof or an enzyme with a function of catalyzing formaldehyde to synthesize glycolaldehyde, such as benzoyl formate decarboxylase (BFD), and aldolase, such as D-fructose-6-phosphate aldolase (FSA), can be utilized to convert the substrate formaldehyde into L-xylose by a one-pot method. The biosynthesis method disclosed by the invention has the advantages of high conversion rate, simple production process, greenness, friendliness, easiness in large-scale production and the like.