962 results about "Hydrogenolysis" patented technology

Methods for hydrogenolysis are described which use a Re-containing multimetallic catalyst for hydrogenolysis of both C—O and C—C bonds. Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 6-carbon sugar, sugar alcohol, or glycerol are described. It has been surprisingly discovered that reaction with hydrogen over a Re-containing multimetallic catalyst resulted in superior conversion and selectivity to desired products such as propylene glycol.

Biofuels can be produced by: (i) providing a biomass containing celluloses, hemicelluloses, lignin, nitrogen compounds and sulfur compounds; (ii) removing sulfur compounds and nitrogen compounds from the biomass by contacting the biomass with a digestive solvent to form a pretreated biomass containing carbohydrates and having less than 35% of the sulfur content and less than 35% of the nitrogen content of untreated biomass on a dry mass basis; (iii) contacting the pretreated biomass directly with hydrogen in the presence of a hydrogenolysis catalyst to form a plurality of oxygenated intermediates, and (vi) processing at least a portion of the oxygenated intermediates to form a liquid fuel.

A method comprises a providing a carbohydrate; reacting the carbohydrate directly with hydrogen in the presence of a hydrogenolysis catalyst to produce a reaction product comprising a polyol; and then processing at least a portion of the reaction product to form a fuel blend.

A method comprising providing a carbohydrate feed; contacting at least a portion of the carbohydrate feed directly with hydrogen in the presence of a hydrogenolysis catalyst to produce a first reaction product comprising a stable hydroxyl intermediate; contacting at least a portion of the first reaction product comprising the stably hydroxyl intermediates with a dehydrogenation catalyst to form a second reaction product; and contacting at least a portion of the second reaction product with a condensation catalyst comprising a base functionality to form a fuel blend.

A method of hydrothermal hydrocatalytic treating biomass is provided. Lignocellulosic biomass solids is provided to a hydrothermal digestion unit in the presence of a digestive solvent, at least one of ammonia or a source of ammonia, and a supported hydrogenolysis catalyst containing (a) sulfur, (b) Mo or W, and (c) Co, Ni or mixture thereof, incorporated into a suitable support. The lignocellulosic biomass solids and digestive solvent are heated in the presence of hydrogen, supported hydrogenolysis catalyst and the at least one of ammonia or a source of ammonia forming a product solution containing plurality of oxygenated hydrocarbons and ammonia. At least a portion of ammonia is separated and recycled to the hydrothermal digestion unit.

The invention relates to an alpha, alpha-dimethyl-benzyl carbinol hydrogenolysis method for preparing isopropyl benzene, and mainly solves the problems of poor stability of catalyst and serious environmental pollution in the isopropyl benzene production process. A technical scheme for solving the problem is as below: introducing raw materials of hydrocarbons containing alpha, alpha-dimethylbenzyl alcohol and hydrogen into a hydrogenolysis reaction zone, and reacting the raw materials with a catalyst by contact to produce isopropyl benzene. The catalyst comprises the following components by weight: a) 0.1-2.0 parts of Pd metal or oxide; b) 85.0 to 97.0 parts of SiO2; c) 1.0-10.0 parts of at least one selected from Ni or oxide thereof, Co or oxide thereof, and Cu or oxide thereof; and d) 1.0 to 5.0 parts of at least one selected from Mg or oxide thereof, Ca or oxide thereof and Ba or oxide thereof. The method can be used in industrial production of isopropyl benzene by alpha, alpha-dimethyl-benzyl carbinol hydrogenolysis.

Processes for the hydrogenolysis of glycerol, as well as products produced therefrom are disclosed.

A method for converting a polyhydric alcohol into propylene glycol and butanediols is disclosed. Also disclosed are methods for converting polyhydric alcohols into three-carbon products and four-carbon products. Also disclosed are methods for maximizing conversion of polyhydric alcohols and minimizing formation of reaction products that are difficult to remove from the desired product. In other embodiments, methods are described to optimize use of reactants, including hydrogen, in hydrogenolysis of polyhydric alcohols.

The invention relates to a catalyst of a 1, 2-propanediol prepared by hydrogenolysis of glycerine. The catalyst is a compound oxide, and contains cuprocide (weight fraction) 25 percent to 60 percent, zinc oxide 35 percent to 70 percent, aluminum oxide (weight fraction) 0 percent to 10 percent and at least one or a plurality of rare-earth oxides 0.5 percent to 10 percent of rare earth elements, such as Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, etc. The catalyst is used in continuous hydrogenolysis reaction of glycerine, in which the conversion rate of the glycerine is high, the selectivity of the 1, 2-propanediol is high and the activity of the catalyst is very stable. The invention also provides the preparation method of the catalyst and application of the catalyst in preparation of 1, 2-propanediol by hydrogenolysis reaction of glycerine.

The invention relates to a method for preparing dihydric alcohol from lignocellulosic biomass, which has main steps of: 1, adding alkali liquor, acid liquor or water for pretreatment after lignocellulosic biomass crushing; 2, carrying out enzymolysis and concentrating liquid glucose filtered through enzymolysis after decoloration and ion exchange impurity removal; 3, adding catalysts with hydrogenation hydrogenolysis activity for carrying out hydrogenation hydrogenolysis reaction on the concentrated liquid glucose under the conditions of the pH being 8 to 14, the temperature being 130 to 250 DEG C and hydrogen atmosphere, separating the catalysts, and producing various dibasic alcohol with the carbon number being 2 to 6 after product rectification. The method utilizes the lignocellulosic biomass pretreatment-zymolyting glucose liquid as raw materials, and monosaccharide, soluble polysaccharides and sugar degradation products can respectively react, so both the efficiency and the process controllability can be greatly improved, and products can be independently used through separation and can be directly used for producing unsaturated polyester resin, polyurethane, fuel additives, surface active agents, emulsifying agents, motor vehicle antifreeze fluid and the like without depth separation.

The invention discloses a loading type Pd base metal nanometer cluster catalyst, a preparing method and applications thereof. The catalyst comprises Pd metal nanometer particles of 1-25nm, or bimetal or polymetal nanometer particles containing Pd, and ferric oxide nanometer particles, wherein the ferric oxide nanometer particle is used as the carrier, has the primary particle size of 5-200nm, and has the general formula of FeyOx; the bimetal or polymetal nanometer particles are selected from one or a plurality of Pt, Rh, Ru, Os, Ir and Re; when the metal nanometer particles are Pd nanometer particles, x/y is greater than 1, but is smaller than 4/3, or is greater than 4/3, but is smaller than 3/2; and when the metal nanometer particles are bimetal or polymetal nanometer particles containing Pd, x/y is greater than 1, but is smaller than or equal to 3/2. The catalyst has excellent activity, selectivity and stability on the selective hydrogenating synthesis chlorinated arylamine of the chlorinated aromatic compounds, solves the problems of hydrogenolysis and dechlorination of products in the process of the Pd catalyst catalyzing the chlorinated aromatic compounds to hydrogenate to prepare the chlorinated arylamine, and has important industrial application values.

A shaped metal fixed-bed catalyst is disclosed which contains at least one catalyst alloy formed of a catalyst metal and an extractable alloying component. The catalyst is activated in an outer layer with a thickness of 0.1 to 2.0 mm starting from the surface by complete or partial extraction of the extractable alloying component. The catalyst may also contain promoters. The catalyst is distinguished from known catalyst in that it is formed exclusively of the catalyst alloy and has a total pore volume of 0.1 to 0.6 ml/g. The catalyst is used for hydrogenation, dehydrogenation and hydrogenolysis reactions.

The invention discloses a method of preparing long chain alkane for a jet fuel by virtue of a sugar platform compound. The method comprises the following steps: carrying out aldol condensation on the sugar platform compound in an aqueous solution under catalysis of alkali to generate a long chain oxygenated compound with ten to seventeen carbons; and then carrying out hydrogenation under the action of a metal catalyst, and finally carrying out hydrogenation, deoxidation, isomerization, cracking and cyclization under the action of the metal catalyst to generate a long chain n-alkane/isoparaffin with eight to fifteen carbons. According to the method disclosed by the invention, other organic solvents are prevented from being used, and in the condensation process, condensation products are separated from one another, a solid condensation product is directly separated from the aqueous solution, and the energy consumption is lowered; a solid product is dissolved by an alcohol solvent, the subsequent hydrogenation and deoxidation processes are carried out on the solid product, and the alcohol solvent can be provided by sugar/sugar alcohol hydrogenolysis; meanwhile, hydrogen needed by the technological process can be directly provided by the reforming process of a sugar alcohol solution, and the C component and the H component in a biological jet fuel and the solvent used in the process can be from biomass materials.

A catalyst for the hydrogenolysis of carbohydrates is disclosed. The catalyst comprises nickel metal on an alumina-silica support. Optionally, the catalyst may be promoted with noble metals selected from the group consisting of copper, ruthenium, rhodium, palladium, platinum, gold, silver, and combinations thereof.

Recovery of ethanol from a crude ethanol product obtained from the hydrogenation of acetic acid and by reacting a portion of the crude ethanol product or one or more derivative streams containing ethyl acetate obtained therefrom in the presence of hydrogen, via hydrogenolysis. The one or more derivative streams comprise ethyl acetate that are reacted in via hydrogenolysis form additional ethanol that may be directly or indirectly fed to the separation zone or the hydrogenation reactor.

Polymers with a hydrolytically labile polymer backbones with non-toxic biocompatible diphenolic repeating units having the structure:

Procedure for the synthesis of deprotected pentasaccharides from a protected precursor pentasaccharide through a reaction procedure having five stages whereamong is included an N-sulphation of amino groups and a hydrogenolysis of benzyl groups. Through this procedure a drastic reduction is achieved in the total synthesis time in comparison with the process traditionally employed, together with increased reproducibility thereof, permitting the standardisation thereof.

The invention relates to a dual-functional hydrogenation catalyst, which comprises a carrier and an active component. The dual-functional hydrogenation catalyst is characterized in that alumina is used as the carrier, the carrier also comprises a titanium component which accounts for 2 to 55 percent of the total weight of the catalyst based on the mass of TiO2, and the alumina accounts for 20 to 85 percent of the mass of the catalyst; the active component is molybdenum or a mixed component of molybdenum and cobalt, the cobalt accounts for 0 to 7.5 percent of the total weight of the catalyst, and the molybdenum accounts for 5.0 to 18 percent of the total weight of the catalyst; and one or more of nickel, copper and rare-earth compound serving as co-catalyst components is/are added into the catalyst, wherein the nickel accounts for 0.5 to 7.5 percent of the total weight of the catalyst, the copper accounts for 0.05 to 1.0 percent of the total weight of the catalyst, and the rare-earth compound accounts for 0.5 to 5.0 percent of the total weight of the catalyst. The prepared catalyst applied in a hydrogenation refining process for high-olefin raw materials such as coking dry gas or catalytic dry gas and the like has good organic sulfur hydrogenolysis and olefin saturation performance.

The invention relates to a method for preparing 1,3-propylene glycol by utilizing a glycerol one-step hydrogenolysis method, in particular to preparation of a loaded solid acid bifunctional catalyst and a method for preparing 1,3-propylene glycol by virtue of glycerol selective hydrogenolysis by utilizing the catalyst. The method provided by the invention comprises the step of introducing hydrogen and reacting for 6-48 hours under the conditions that glycerol is taken as raw material, solvent and catalyst exist, reaction temperature is 100-230 DEG C and reaction pressure is absolute pressure of 0.2-10.0MPa. In the bimetal modified loaded strong acid catalyst prepared by adopting the method provided by the invention, a second non-precious metal is doped into the catalyst, dispersion degree of previous metal is further improved, thus the catalyst has stronger acidity, larger specific area and good stability; in the catalyst containing trace previous metal, cheap non-previous metal is introduced; glycol conversion rate is improved under lower reaction pressure while selectivity of 1,3-propylene glycol is obviously improved; meanwhile, effective utilization rate of the previous metal is improved, and cost of the catalyst is reduced.