129 results about "Hydroxyacetone" patented technology

Compositions for generating a cooked flavor in a foodstuff, comprising specified flavor precursors that react on heating to generate the flavor and maintain a reactive association after inclusion in the foodstuff. The compositions may include combination of a sulphur source, e.g. hydrogen sulphide, methane thiol, a sulfur-containing amino acid, thiamine, cystine, sodium sulphide, ammonium sulphide, ammonium polysulphide, onions, garlic, shallots, eggs, methionine, and mixtures thereof, and at least one reductone, e.g. a furanone, a ketone, a pyrone, an aldehyde, a carbonyl compound, isomaltol, maltol, pyruvaldehyde, hydroxyacetone, 3-deoxyglucosone, 5-hydroxy-5,6-dihydromaltol, 2,3-butanedione, 3-hydroxy-2-butanone, a process flavor, cooked vegetable concentrates, soy sauce, and mixtures thereof.

A process for converting carbonyl-type impurities contained in a phenolic solvent to high-boiling derivatives is provided by contacting the phenolic solvent with a hydrotalcite-type material (HTM). The phenol can be separated from the high-boiling derivatives using conventional separation techniques, such as distillation, so the invention also provides a process for separating carbonyl-type impurities, such as hydroxyacetone (HA), from a phenolic solvent. The process can be applied in the conventional industrial process for converting cumene to phenol to remove carbonyl-type impurities from the phenol product. A process and a facility for producing purified phenol by converting cumene to phenol are provided. In the conversion of cumene to phenol, the phenol often contains carbonyl-type impurities. The phenol and carbonyl-type impurities are reacted in the presence of an HTM to produce phenol and high-boiling derivatives. The phenol may be further purified using conventional separation techniques, such as distillation, to remove the high-boiling derivatives.

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.

Industrial processes for the alternating conversion of glycerol to either an amino alcohol product or propylene glycol are disclosed. Glycerol is converted to hydroxyacetone which may then be directly reduced to obtain propylene glycol or optionally reacted with an amine compound to produce an adduct that may be reduced to obtain an amino alcohol product.

Processes for converting glycerol to an amino alcohol product involving reacting glycerol with a metal catalyst to obtain hydroxyacetone, and reacting the hydroxyacetone with an amine compound to obtain an adduct that is then reduced using a reducing agent to obtain an amino alcohol product are described.

The invention discloses a new method for preparing 1, 3-dihydroxyacetone from glycerol, which comprises the following steps: (1) acetalation reaction, which is to perform acetalation reaction of the glycerol and benzaldehyde in the presence of a water-carrying agent and under the action of an acid catalyst A so as to obtain glycerol benzaldehyde acetal ester having a structure as shown in the formula (I); (2) oxidation reaction, which is to oxidize the glycerol benzaldehyde acetal ester in an organic solvent and under the action of an oxidizer so as to obtain 5-carbonyl-2-phenyl -1, 3-dioxane having a structure as shown in the formula (II); and (3) hydrolysis reaction, which is to hydrolyze the obtained 5-carbonyl-2-phenyl -1, 3-dioxane in the presence of an acid catalyst B so as to prepare a 1, 3-dihydroxyacetone dimer having a structure as shown in the formula (III). The synthetic route of the method uses the glycerin as a raw material, thus both the selectivity and the yield are higher than that by a method of direct oxidation, the target product is simple and convenient to separate, and the product purity can reach 99 percent; and compared with the prior art, the synthetic route of the method has stronger market competitiveness.

The invention discloses application of gluconobacter oxydans in preparing 1,3-dioxyacetone. The gluconobacter oxydans is named gluconobacter oxydans NH-10, and preserved in the China General Microbiological Culture Collection Center with the number of CGMCC No.2709 and the preservation data of October 14, 2008. The gluconobacter oxydans NH-10 can convert glycerol in high efficiency under a condition of high concentration glycerol to produce the 1,3-dioxyacetone. Under the technical condition of the application, the conversion rate of the glycerol can reach 99.7 percent (w/w), and the yield of the 1,3-dioxyacetone can reach 97 percent, the concentration of the 1,3-dioxyacetone in the conversion solution reaches 166.2g/L, and other components are scarcely contained in the conversion solution. The microorganism strain is applicable to industrial production of dioxyacetone.

A process for producing a purified phenol stream generally includes contacting a phenol stream containing an initial concentration of hydroxyacetone and methylbenzofuran with an acidic ion exchange resin at a temperature of 50° C. to 100° C. to concurrently reduce the initial concentration of the hydroxyacetone and the methylbenzofuran in the phenol stream to produce the purified phenol stream.

The invention relates to a reaction technology for manufacturing hydroxyacetone through selective dehydration of natural glycerin, and a corresponding catalyst. The catalyst is composed of low-activity carriers such as SiO2, etc. and active metal components of 20 to 90wt percent, and is prepared by adopting an insuccation loading method. The active metal components which are used are IB group elements, or the combination of IB and VIB group elements, or the combination of IB, VIB and light rare earth elements. The reaction for manufacturing the hydroxyacetone through selective dehydration of the natural glycerin is performed in a fixed bed flowing-type reactor; the glycerin conversion rate can reach up to 99.89 percent, and the molar selectivity of the hydroxyacetone can reach up to 89.74 percent under the conditions that the material concentration can reach 10 to 100 percent, the normal atmosphere is provided, the temperature ranges from 200 to 400 DEG C, and the liquid hourly space velocity (LHSV) satisfies 0.01 to 0.60h<-1>. The catalyst has simple preparation technology and low price, and the concentration of the reaction material that is glycerin water solution and the liquid hourly space velocity has wide range.

The invention discloses a catalyst for selectively preparing acraldehyde and hydroxy-acetone from biological glycerol in a controllable manner and a preparation method of the catalyst. The catalyst is prepared by adopting a novel impregnation in-situ reduction method; the Cu/HZSM-5 catalyst, which is prepared from pure glycerol by using the method, has a glycerol catalytic conversion rate of 92.1% in a reaction kettle under gentle condition and has controllable selectivity of 87.3wt% and 12.4wt% to acraldehyde and hydroxy-acetone, respectively; and 98.2wt% conversion rate for glycerol and 86.2wt% selectivity for hydroxy-acetone can be obtained by similar glycerol catalytic dehydration reaction in a reaction distillation device. The dispersed and stable catalyst, which is obtained by adopting a catalyst preparation method, is simple and easy to operate and favorable for large-scale production. Moreover, the catalytic glycerol is gentle in solvent-free dehydration reaction, high in catalytic activity, strong in controllable selectivity, and therefore, the method is a green process with advantages of environment friendliness and low cost.

The invention discloses a method for preparing dihydroxy acetone by selectively oxidizing glycerin with hydrogen peroxide and belongs to the field of preparation of the dihydroxy acetone. The method comprises the following steps of: adding a transition metal hydrotalcite-like compound as a catalyst in 10 to 100 mass percent of glycerin aqueous solution, and controlling the dosage of the catalyst to be 5 to 20 percent of the mass of the glycerin; raising the temperature of a mixture to 25 to 90 DEG C by heating, dripping 3 to 50 mass percent of hydrogen peroxide, and reacting for 1 to 24 h; after reaction, centrifugally separating the catalyst from a reaction solution; and recovering the catalyst for reusing, and feeding the reaction solution to a liquid chromatogram for identification analysis. By using the glycerin and the hydrogen peroxide as raw materials, under the action of the transition metal hydrotalcite-like compound which serves as the catalyst, the conversion rate of the glycerin and the yield of the dihydroxy acetone are high; any acid base and any organic additive are not added in a reaction system; and the method has the advantages of high yield, low cost, no environmental pollution, easiness in separation, good repeatability, and the like.

The invention provides a catalyst for 1,3-dihydroxyacetone prepared from glycerin and a preparation method thereof. The catalyst is prepared by the steps: introducing an auxiliary component M into a hydrotalcite slab to form M-Zn-Y ternary hydrotalcite M-ZnY-LDHs, and calcining to obtain MOx/ZnYOz; taking the composite oxide as a carrier, supporting an Au salt onto the carrier, drying and reducing, thereby obtaining the Au-MOx/ZnYOz. The active ingredient Au of the catalyst is small in granule size, highly dispersed and stable under the actions of highly dispersed transition metal oxide MOx, has high catalytic oxidation activity of the glycerin and maintains excellent recyclability. The catalyst is applied to a reaction for preparing dihydroxy acetone by virtue of selective glycerin oxidation, and has high dihydroxy acetone yield under non-alkali conditions.

The invention relates to a natural biological pesticide fertilizer, a preparation method and a use method thereof. Through detection on the basis of a chromatography and mass spectrometry combined measuring process, the natural biological pesticide fertilizer provided by the invention comprises the following components: 8-52% of acetic acid, 1-4.3% of formic acid, 0.6-3.2% of propionic acid, 0.02-0.1% of hydroxyacetone, 0.4-2% of isoquinoline, 0.2-0.9% of guaiacol, 0.8-2.3% of p-cresol, 0.3-1.8% of m-cresol and the balance of water. The invention has the beneficial effects that the natural biological pesticide fertilizer is easy to dissolve in water, can be easily absorbed by plants, is beneficial to sterilization, parasite expelling and inhibition of plant diseases and insect pests, and is capable of enhancing immunity system of plants, strengthening roots, boosting seedlings, promoting plant absorption, regulating plant metabolism, improving soil and promoting quality and stress resistance of crops; the natural biological pesticide fertilizer can be widely applied to economic crops, such as cereals, vegetables, melon and fruit, tea leaves, edible mushrooms, garden plants and Chinese herbal medicines; the natural biological pesticide fertilizer can be used for treating plant seeds, dipping roots, spraying, performing drop irrigation, watering, and preventing and controlling pests.

The invention relates to an acrylaldehyde preparation method by glycerin dehydration under inert gas dilution, particularly an acrylaldehyde preparation method by the glycerin which is the byproduct of the preparation of biodiesel. Under inert gas atmosphere, alumina and acid zeolite are taken as catalyst; under the conditions that the reaction temperature is 200-500 DEG C, the reaction pressure is 0.001-3.0MPa and the liquid airspeed is 0.1-100.0h<-1>, the glycerin is directly dehydrated to generate acrylaldehyde and byproduct hydroxyacetone. The technique is characterized in that dehydration reaction is carried out under inert gas atmosphere, thus the activity, selectivity and stability of the reaction are high, especially high concentration glycerin can be taken as raw material and is high in selectivity and stability; thus reducing waste liquid treatment capacity of post treatment and greatly reducing energy consumption and production cost.

The invention discloses a method for the hydrogenolysis catalysis of glycerin, in which an atmospheric fixed bed reactor is adopted for reaction and which is characterized in that Cu-Zn-Ti or Cu-Zn-Zr with different elemental proportions is used as catalyst to catalyze glycerin at normal atmosphere between 240 DEG C to 300 DEG C to achieve hydrogenolysis at gas phase, and hydroxyacetone, ethyleneglycol and propylene glycol products are selectively prepared. The method, having the advantages of high catalyst activity, high conversion rate of glycerin, good product selectivity, mild reaction conditions, small environmental pollution and the like, provides a new effectual way of the hydrogenolysis catalysis of glycerin, thereby effectively solving the problems in the prior art.

The present invention relates to the use of hydrocarbons derived from natural gas in the fermentative production of biochemicals including biofuels. More specifically, the present invention provides the method for manufacturing dihydroxyacetone (“DHA”) from natural gas, biogas, biomass and CO₂ released from industrial plants including electricity-generating plants, steel mills and cement factories and the use of DHA as a source of organic carbon in the fermentative production of biochemicals including biofuels. The present invention comprises three stages. In the first stage of the present invention, syngas and formaldehyde are produced from natural gas, biogas, biomass and CO₂ released from industrial plants. In the second stage of the present invention, formaldehyde and syngas are condensed to produce DHA. In the third stage of the present invention, biochemicals including biofuels are produced from DHA using fermentation process involving wild type or genetically modified microbial biocatalysts.