172 results about "Gamma-Valerolactone" patented technology

The invention relates to a method for preparing aromatic hydrocarbon and cyclopentenone from biomass derivative gamma-valerolactone by catalytic conversion, which comprises the following steps: (1) using biomass derivative gamma-valerolactone as a raw material, which is prepared by carrying out hydrogenation reaction on levulinic acid; (2) introducing one or more transition metals into a zeolite molecular sieve, and preparing a reaction catalyst at the reaction temperature of 350-550 DEG C by using a fixed bed or fluid bed as a reactor; (3) in an inert or reducing atmosphere, carrying out contact reaction on the raw material gamma-valerolactone and catalyst under the reaction pressure of 0-10 MPa; and (4) after the pyrolysis gas is condensed, collecting the liquid product in the condensation receiver, thereby obtaining the aromatic hydrocarbon product (of benzene, toluene and xylene) and the cyclopentenone product. By using the renewable biomass derivative gamma-valerolactone as the raw material, the method has the advantage of milder reaction conditions, and the catalyst is simple to prepare and easy to recover and reuse.

The invention discloses a method for synthesizing gamma-valerolactone based on catalytic hydrogenation. According to the method, levulinic acid or levulinate derivatives in a reaction solvent is / are subject to catalytic hydrogenation for 1-10 hours by adding hydrogen gas and keeping the hydrogen gas pressure at 0.5-5.0 MPa under the action of a supported cobalt catalyst and the temperature of 50-240 DEG C, and the reaction liquid is treated to obtain the gamma-valerolactone. The cobalt catalyst prepared according to the method has excellent catalytic activity and selectivity, the conversion rate of levulinic acid or levulinate is 100 percent, the yield of the gamma-valerolactone reaches up to 99 percent above; and the method has a simple operation technology, and is low in cost, safe and environment-friendly.

A method to make levulinic acid (LA), furfural, or gamma-valerolactone (GVL). React cellulose (and / or other C6 carbohydrates) or xylose (and / or other C5 carbohydrates) or combinations thereof in a monophasic reaction medium comprising GVL and an acid; or (ii) a biphasic reaction system comprising an organic layer comprising GVL, and a substantially immiscible aqueous layer. At least a portion of the cellulose (and / or other C6 carbohydrates), if present, is converted to LA and at least a portion of the xylose (and / or other C5 carbohydrates), if present, is converted into furfural.

The invention discloses a method for using levulinic acid to prepare gamma-valerolactone by hydrogenation. Skeleton copper is used as a catalyst, copper-aluminum alloy as a catalyst precursor contains Group VIII transition metals to improve the activity and selectivity of the skeletal copper catalyst, the copper-aluminum alloy is extracted and activated by inorganic base solution to prepare the skeletal copper catalyst with the functions of hydrogenation and the functions of a molecule lactonization loop-locked, appropriate quantities of skeletal copper catalyst, additives and solvent added into the liquid-phase hydrogenation system of levulinic acid, and the catalyst can be continuously recycled. The method has the advantages of low catalyst cost, simple process, easiness in operation and high yield of gamma-valerolactone.

The invention discloses a method for preparing GAMMA-valerolactone from levulinic acid and formic acid, which is characterized in that the levulinic acid is in situ reduced at 100-200 DEG C in the presence of ruthenium catalyst and formic acid contained in a system as reducer, and distillation is carried out to obtain mixture containing the product GAMMA valerolactone and used catalyst; and mother liquor containing the used catalyst and raw material are mixed to realize circulation of the catalyst, thereby greatly improving environmental friendliness. The method avoids the energy source consumption during valerolactone purification process, avoids hydrogen source acquired from the system exterior, and improves the economy and security of a production system, with the advantages of simple operation process. The formic acid is decomposed to generate large amount of carbon dioxide besides hydrogen, which is convenient for collection and utilization.

The invention provides a ruthenium-based catalyst for preparing gamma-valerolactone from acetylpropionic acid, and a preparation method for the ruthenium-based catalyst. The ruthenium-based catalyst comprises an active ingredient and a catalyst carrier, wherein the active ingredient is ruthenium and accounts for 1 to 10 weight percent and the rest is the catalyst carrier; or the ruthenium-based catalyst comprises an active ingredient, a cocatalyst and a catalyst carrier, wherein the cocatalyst is a group VIII element or a group IB element and accounts for not more than 10 weight percent, the active ingredient is ruthenium and accounts for 1 to 5 weight percent, and the rest is the catalyst carrier. An acetylpropionic acid solution can be completely converted under the action of the ruthenium-based catalyst at the temperature of between 70 and 120DEG C under the pressure of 1 to 5MPa, and the selectivity of the gamma-valerolactone is up to 100 percent. The invention has the advantages that the catalyst is prepared by a green synthesis process, the process is simple and easy to operate, the product selectivity is high, the production process is high in safety, environmental pollution is avoided, and the catalyst has potential industrial application value.

The invention relates to a method for preparing gamma-valerolactone with high selectivity under the mild condition. The method comprises the following steps of: under the conditions of optimal room temperature and inert gas, with secondary alcohol as a hydrogen source and active Raney nickel as a catalyst, carrying out hydrogen transfer reaction on a levulinic acid ester compound to obtain the gamma-valerolactone. The invention particularly relates to a method of preparing gamma-valerolactone by a lignocellulose derivative with high selectivity under the mild condition, which comprises the following steps of: carrying out alcoholysis reaction on the lignocellulose derivative such as fructose, 5-hydroxymethylfurfural or furfuryl alcohol by a solid acid catalyst in the presence of an alcohol solvent at certain temperature, filtering solid acid, collecting liquid, and obtaining levulinic acid esters through reduced pressure distillation; and with the secondary alcohol as the hydrogen source, catalyzing the obtained esters by Raney Ni as a non-noble metal catalyst at the room temperature to obtain the gamma-valerolactone with high yield.

The invention provides a sweet taste functional clustering substance preparation which has the taste close to tobacco sweet taste and is capable of obviously increasing the tobacco taste, which comprises the following compositions in mass percentage: 0.0001 to 0.0004 percent of clove oil, 0.0001 to 0.0006 percent of anise oil, 0.2 to 0.8 percent of date oil, 0.01 to 0.03 percent of maltol, 0.05 to 0.15 percent of dihydroactinidiolide, 0.002 to 0.008 percent of benzyl cinnamate, 0.1 to 0.6 percent of gamma-Valerolactone, 0.002 to 0.008 percent of phenethyl acetate, 0.0001 to 0.0003 percent of menthyl acetate, 0.0001 to 0.0006 percent of Beta-Damascenone, 0.02 to 0.08 percent of methyl cyclopentyl hydroxybenzyl thiocyanide ketone, 0.003 to 0.009 percent of dihydrogen Beta-Damascenone ketene, 0.001 to 0.003 percent of raspberry ketone, 0.01 to 0.05 percent of neohesperidin, 0.03 to 0.09 percent of vanilline, 0.001 to 0.005 percent of perillartine, 0.01 to 0.03 percent of aspartame, 0.02 to 0.08 percent of glycyrrhizine, 0.01 to 0.03 percent of malic acid, 0.002 to 0.008 percent of 2- methylbutanoic acid, 0.02 to 0.08 percent of sodium glutamate, 0.01 to 0.05 percent of sodium chloride, 0.002 to 0.006 percent of 2-phenylethanol, 0.0001 to 0.0003 percent of geraniol, 0.002 to 0.008 percent of nerolidol, 0.5 to 1.5 percent of guarana extractive, 1.0 to 2.0 percent of tomato extractive, 0.1 to 0.3 percent of grape extractive, and 95 percent of ethanol residue. The addition of the spice preparation can greatly improve the tobacco quality of cigarettes, and increase rich and inviting sweet taste of the cigarettes, thereby reducing the use level of sound tobacco. Moreover, the product has stable quality and good economic benefits.

The invention provides a green separating process for components of lignocellulose, which belongs to the fields of high-value utilization of biomass resources and biochemical industry. According to the process, biomass is pretreated with irradiation and then coupled with low-boiling-point tetrahydrofuran or high-boiling-point gamma-valerolactone for a reaction, and primary filtering is carried out so as to obtain a cellulose component; tetrahydrofuran is recovered from obtained filtrate or a saturated NaCl solution is added into the filtrate for phase-split precipitation of lignin; and secondary filtering is carried out, the obtained residue is a lignin component, and secondary filtrate is dried so as to obtain a hemicellulose component. The process has the advantages that no organic solvent like acid, alkali and alcohol is needed for separation of the components of lignocellulose and the process is simple, highly efficient and clean.

The invention discloses a method for preparing gamma-valerolactone from furfural on a metal / solid acid catalyst. On a multifunctional metal / solid acid catalyst, a hydrogenation hydrolysis product of furfural is further hydrogenated without being separated to obtain gamma-valerolactone, the reaction temperature is 80-200 DEG C, the conversion rate of furfural can reach 100%, and the selectivity of gamma-valerolactone can be equal to or higher than 80%. By adopting the technology, the fine chemical gamma-valerolactone with high added value can be synthesized from one of a renewable energy sources, namely biomass and a derivative thereof so as to reduce the relay on petrochemical materials on one hand; on the other hand, one-kettle reaction is carried out on furfural on one catalyst to prepare gamma-valerolactone, so as to avoid the separation of an intermediate product levulinic acid and save the energy source, so that the method is a green and feasible catalytic process.

The present invention provides a method for preparing levulinic acid and co-producing gamma-valerolactone from biomass. The method comprises: mixing biomass and a gamma-valerolactone aqueous solution according to a weight ratio of the biomass to the gamma-valerolactone of 1:5-1:200, and dissolving the biomass under a heating condition; adding a solid acid catalyst to the filtrate to prepare levulinic acid; and adding a Ru, Ni or Pt base catalyst to prepare gamma-valerolactone. According to the present invention, after cellulose and hemicellulose in the biomass are dissolved in the gamma-valerolactone, the contact area with the solid acid is substantially increased so as to improve reaction efficiency and a product yield; the solid acid can be reused after recycling, such that waste acid emission can be avoided, cost can be reduced, and pollution on the environment can not be caused; the final product is the gamma-valerolactone so as to avoid separation of the product and the solvent; and difficult problems of low product yield, easy catalyst deactivation and low product separation cost due to existing of a large amounts of water during a levulinic acid and gamma-valerolactone preparation process using biomass in the prior art are solved.

A method to produce levulinic acid (LA) and gamma-valerolactone (GVL) from biomass-derived cellulose or lignocellulose by selective extraction of LA using GVL and optionally converting the LA so isolated into GVL, with no purifications steps required to yield the GVL.

A method to produce levulinic acid (LA) and γ-valerolactone (GVL) from biomass-derived cellulose by selective extraction of LA by alkylphenol (AP) and hydrogenation of LA, in which mineral acid used in the method is recycled and the final concentration of GVL is increased by successive extraction / hydrogenation steps to allow for effective separation by distillation.

The invention provides a method for preparing furfuryl alcohol by utilizing a hydrogen transfer reaction to catalyze furfural. The method comprises the following steps that under the catalysis of a heterogeneous catalyst, namely magnetic hydroxyapatite, the furfural and alcoholic compounds with hydrogen donors are subjected to the hydrogen transfer reaction, wherein the ratio of the magnetic hydroxyapatite to the alcoholic compounds to the furfural is 20-120 g to 8-20 L to 1 mol. A reaction container is filled with nitrogen (N2) of which pressure is 1-20 bar at room temperature, the reaction temperature is 100 DEG C-200 DEG C, and a reduced product, namely the furfuryl alcohol, is obtained after 1-12 h. The method for preparing the furfuryl alcohol by utilizing the hydrogen transfer reaction to catalyze the furfural is simple in process, convenient to operate and safe and environmentally friendly. The catalyst is a non-precious metal catalyst and cheap and easy to obtain, has magnetism and is easy to separate, and can be reused repeatedly. The activity does not decrease. The industrial cost of preparing the furfuryl alcohol can be lowered to a large extent, ethyl levulinate can be catalyzed to react and gamma-valerolactone is generated, and other compounds containing C=O bonds can be also reduced.

An industrially viable process for selective preparation of γ-valerolactone using recyclable non noble metal catalyst is provided. This process provides 80-100% conversion to γ-valerolactone, with selectivity in the range of 80-100%.

The invention provides a method for catalyzing gamma-valerolactone to be subjected to ring-opening polymerization by utilizing a biomimetic catalyst and belongs to the field of biomass high molecular materials. According to the method, the gamma-valerolactone is used as a monomer, the biomimetic catalyst is used as a catalyst and an alcohol compound is used as an initiator, and the gamma-valerolactone is subjected to the ring-opening polymerization in a solvent to obtain poly-gamma-valerolactone; the biomimetic catalyst is one or a mixture of more of a thioureaamide type dihydrogen bond donor catalyst, an aminothiazole type dihydrogen bond donor catalyst and a phenyl phosphate type dihydrogen bond donor catalyst. Compared with a traditional catalyst, the aminothiazole type biomimetic catalyst, the thioureaamide type biomimetic catalyst and the phenyl phosphate type biomimetic catalyst have no metal and the utilization amount is small; the catalysis effect is higher under the action of a dihydrogen bond.

Disclosed are a heteropolyacid catalyst for producing gamma-valerolactone, which is supported on M-Beta zeolite (M=Sn, Ti, Zr or Hf), and a method for preparing the same and a method for manufacturing gamma-valerolactone using the catalyst. The catalyst has an effect of producing gamma-valerolactone from biomass-derived furfural at a high yield through a one-pot process.

The invention relates to a homogeneous catalytic preparation method of gamma-valerolactone. The method comprises the step of reacting an acetylpropionic acid raw material with a hydrogen source raw material to obtain the product of gamma-valerolactone by using water as a solvent and with the existence of a water soluble iridium catalyst. By adopting the method disclosed by the invention, the defect that the existing preparation method of the gamma-valerolactone needs harsh reaction conditions of high temperature, high pressure, a lot of organic acid, a lot of organic base, and a lot of organic solvent is conquered, the economical efficiency and safety of the preparation method are improved, reaction is simple, catalyst is small in dose and can be repeatedly used, and the product is high in yield, easy to separate, and is quite high in industrial application value.

The invention discloses a synthetic method of gamma-valerolactone. The synthetic method of gamma-valerolactone comprises the following steps of: (1) fully mixing methyl levulinate with an alcohol to obtain a mixed raw material liquid, wherein the concentration of the methyl levulinate in the mixed raw material liquid is 2-12wt%; and (2) adding a double metal catalyst into the mixed raw material liquid, heating the mixed raw material liquid in a high pressure reaction kettle to 170-290 DEG C to react for 0.5-9h, and cooling the mixture to room temperature to obtain gamma-valerolactone. By applying a copper-based double metal catalyst, the activity of the catalyst is adjusted by doping a second active metal, so that gamma-valerolactone can be prepared by catalytic in-situ hydrogen production by alcohol and selective catalytic hydrogenation of methyl levulinate.

An acid-proof catalyst for preparing gamma-valerolactone from levulinic acid is characterized by comprising the following components in percentage by mass: based on an oxide, 10 to 70 percent of active component, 0.05 to 20 percent of catalyst accelerator, and the balance of carrier. The acid-proof catalyst has the advantages of low cost, simple process, easy operation, high product yield rate and high safety in a production process.

The invention relates to a process for preparing gamma-valerolactone by utilizing an iridium-pincer ligand complex catalyst, particularly to the process for preparing the gamma-valerolactone by catalyzing levulinic acid for hydrogenation reduction and and lactonization. The process for preparing the gamma-valerolactone by utilizing the iridium-pincer ligand complex catalyst is characterized in that 1-5 MPa hydrogen is used as a reducing agent at a temperature between 50 DEG C and 100 DEG C, the gamma-valerolactone is prepared by catalyzing the levulinic acid for hydrogenation reduction and lactonization under the action of iridium catalyst which accounts for 0.01 to 0.1 mol% of quantity of levulinic acid. The process for preparing the gamma-valerolactone by utilizing the iridium-pincer ligand complex catalyst eliminates the disadvantage that a high temperature and high pressure reaction condition is required for gamma-valerolactone production so that economy and security of the production system are improved. Dosage of the catalyst is small, productivity is high and selectivity is good.

The invention relates to cellulose conversion to prepare chemicals, and particularly relates to a method, wherein a molecular sieve and a metal or a metal interstitial compound are adopted as active components, the metal or the metal interstitial compound are clad within pore channels of the molecular sieve to prepare a bifunctional catalyst, and the catalyst is used for cellulose hydrogenation degradation conversion to prepare dihydric alcohol, hexahydric alcohol and gamma-valerolactone. The molecular-sieve-clad metal or interstitial compound catalyst has characteristics of small size of the metal or the metal interstitial compound nanometer particles, high dispersity, high catalyst activity and high selectivity.

The invention discloses a method for preparing gamma-valerolactone by levulinic acid ester without solvents, and relates to gamma-valerolactone. A copper chromite catalyst is added into the levulinic acid ester and reacts in hydrogen atmosphere to obtain solid-liquid mixture, pressure is reduced, suction filtration is performed to obtain binary liquid mixture containing gamma-valerolactone and corresponding alcohols, and the alcohols are recovered by distillation to obtain the gamma-valerolactone. Cheap and easily separated copper chromite serving as the catalyst is added into the levulinic acid ester from biomass, and the gamma-valerolactone is prepared at one step in a solvent-free system. The copper chromite catalyst is activated in situ in the system, so that a traditional catalyst pre-hydrogenation step is omitted. The method is simple and efficient, and an effective way is provided for large-scale preparation of biomass-based gamma-valerolactone.

Disclosed is an ink composition including: (1) a pigment; (2) a polymerization initiator having a content of 2% by mass or more with respect to a total amount of the composition and having a solubility with respect to pure water at 25° C. of 5 to 8 g / l; (3) a compound A that is at least one selected from the group consisting of dimethylacrylamide, diethylacrylamide, N-isopropylacrylamide, dimethylacetamide, N-ethylpyrrolidone, 1-cyclohexyl-2-pyrrolidone, 1-(2-hydroxyethyl)-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, tetramethylurea and gamma-valerolactone; (4) a polymerizable compound having two or more ethylenically unsaturated double bonds; and (5) water having a content of 50% by mass or more with respect to the total amount of the composition.

The invention discloses a method for preparing 5-hydroxymethyl furfural from sugar. The method is characterized in that a hexose is taken as the raw material, and a Levis acid is taken as a catalyst, the hexose is converted into 5-hydroxymethyl furfural in a mixed solvent system of water and gamma-valerolactone at temperature of 50-220 DEG C and the pressure of 0.1MPa-2MPa under the catalysis of the Levis acid. The method has the beneficial effects that the product yield is high, and the process route is simple. The method has potential industrial application prospect.

The invention discloses a method for preparing gamma-valerolactone by transferring and hydrogenating levulinic acid and ester thereof, and relates to gamma-valerolactone. The method includes adding organic alcohol into a reaction substrate to obtain alcoholic solution used as raw material liquid; placing the raw material liquid into a high-pressure reaction kettle, adding metal oxide catalysts into the high-pressure reaction kettle and enabling the raw material liquid and the metal oxide catalysts to carry out heating reaction so as to obtain the gamma-valerolactone which is a target product. The method has the advantages that alcohol is used as a hydrogen donor and a reaction medium simultaneously, external hydrogen sources and other solvents are omitted, a reaction system is simple, and the method is favorable for separation of the target product; the levulinic acid and the ester thereof can be selectively reduced in a catalytic transferring and hydrogenation mode, transfer and hydrogenation are high in selectivity for ketone groups, and accordingly excessive hydrogenation products can be prevented; cheap and easily available metal oxides are used as catalysts, particularly, the levulinic acid and the ester thereof can be efficiently and selectively reduced under a super-critical condition, and other catalytic promoters are omitted.

The invention relates to a method for producing aromatics from biomass and a composition obtained by the method. The method comprises the following steps: a) catalytic conversion of biomass raw materials and separation of products to obtain levulinic acid, furfural and formic acid; b) contacting the levulinic acid obtained in step a) with an aromatization catalyst to obtain Aromatic stream I of toluene; c) optionally, levulinic acid obtained in step a) is contacted with a hydrogenation catalyst to obtain gamma-valerolactone and / or methyltetrahydrofuran; d) optionally, furfural obtained in step a) Contacting with a hydrogenation catalyst to obtain methyl tetrahydrofuran; e) Optionally, the γ-valerolactone obtained in step c) is contacted with an aromatization catalyst to obtain an aromatic hydrocarbon stream II containing benzene, toluene and xylene; f) optionally , the methyl tetrahydrofuran obtained in step c) and / or step d) is contacted with an aromatization catalyst to obtain an aromatic hydrocarbon stream III containing benzene, toluene and xylene. The method can be used in the industrial production of aromatics such as benzene, toluene and xylene from biomass containing cellulose and hemicellulose.