92results about How to "Reaction process green" patented technology

The invention relates to a method for preparing aromatic hydrocarbon by carrying out catalytic hydrodeoxygenation on lignin. A catalyst used in the method provided by the invention comprises two active components, namely an acid site being one or combination of more than one of transition metal elements niobium, tantalum, zirconium, molybdenum, tungsten and rhenium and a hydrogenation or hydrogen transfer active site being one or more than one of ruthenium, platinum, palladium, iridium, iron, cobalt, nickel and copper. According to the method provided by the invention, a phenol group, a guaiacol group, a syringa phenolic group compound, natural lignin and industrial lignin are taken as raw materials, water is taken as a solvent, high selectivity catalytic hydrodeoxygenation is carried out at the temperature of 180-350 DEG C and hydrogen pressure of 0.1-5MPa or with methyl alcohol, isopropyl alcohol and formic acid as hydrogen sources, so that C6-C9 aromatic hydrocarbon is obtained, the highest mass yield of aromatic hydrocarbon is 10%, and content of aromatic hydrocarbon in product oil can be up to more than 75%. The method provided by the invention has the advantages that reproducible natural biomass can be used as a raw material, and the raw material is cheap and available; the water is taken as the solvent, so that a reaction process is environment-friendly; and content of aromatic hydrocarbon in the product is high, and reaction conditions are mild.

The invention relates to a low-temperature aqueous-phase catalyst for lignin phenol derivative hydrodeoxygenation and a preparation method thereof. The catalyst comprises a zeolite molecular sieve HBeta serving as a carrier and a load Ru, wherein the molar ratio of silicon to aluminum is 10-50, and the loading amount of Ru is 0.1 to 2%. The preparation method comprises the following steps: mixing measured aqueous solution of RuCl3 with a zeolite suspension, evaporating water and drying, and then reducing the obtained solid with hydrogen/argon mixed gas. A cyclic hydrocarbon (the conversion rate is greater than 98% and the selectivity is greater than 95%) is prepared at high selectivity under the relatively mild (100-150 DEG C and 1-4MPa) condition, so that the defects that the reaction conditions are harsh and the energy efficiency is low in the refining process of biomass pyrolysis oil can be overcome. The bifunctional catalyst provided by the invention has the advantages of simplicity and easiness in operation in the preparation process, stable physical and chemical properties, and direct application. At low temperatures, the catalyst shows excellent hydrodeoxygenation activity and extremely high selectivity of saturated hydrocarbons, has a simple and environment-friendly reaction process, and can be widely used in the refining of bio-gasoline.

The invention discloses a method of preparing glycol dimethyl ether through continuous etherification in a fixed bed. In the method, with industrial ethylene glycol and industrial methanol as raw materials and with a solid acid catalyst, the glycol dimethyl ether is continuously prepared through the fixed bed, wherein the molar ratio of the ethylene glycol to the methanol is 0.02-10, the reaction temperature is 100-400 DEG C, the reaction pressure is 0.1-10 MPa and liquid space velocity is 0.3-2/h. The method reaches more than 90% in conversion of the ethylene glycol and more than 74% in selectivity on the glycol dimethyl ether. The method is simple in processes, is high in product selectivity and is suitable for further large-scale production.

The invention relates to a method for preparing navodon septentrionalis skin anti-oxidative peptide liquid through in vitro simulation of gastrointestinal digestion and belongs to the fields of food processing technology and protein utilization technology. The adopted preparation process comprises the following steps: preprocessing raw material navodon septentrionalis skin by shearing, drying, grinding, etc.; through an in vitro gastrointestinal digestion simulation technology, simulating a gastrointestinal digestion system through dual enzyme constructed from pepsase and trypsin; inactivating enzyme through a boiling water bath, regulating pH value and integrating twice centrifugal means to prepare the fish skin anti-oxidative peptide liquid. The preparation method disclosed by the invention, through a dual-enzyme digestion reaction system, greatly improves hydrolysis efficiency of fish skin protein and realizes full utilization of raw material; the process of in vitro simulation of gastrointestinal digestion is implemented in 37 DEG C water bath; an enzymolysis condition is mild and similar to a human body, and a digestion process of a human body can be better reflected.

The invention relates to a method for preparing dimethyl succinate. The method comprises the following steps: (1) preparing disodium succinate fermented liquid; (2) treating the disodium succinate fermented liquid; and (3) preparing dimethyl succinate by using a bipolar-membrane electrodialysis apparatus. The processes such as catalyst cleaning, regeneration, and the removal of a deactivated catalyst, and the like existing in the traditional preparation process are omitted; and the whole reaction process is green and clean, and completely conforms to the operating requirements of the modern chemical industry.

The invention relates to an alloy catalyst and a preparation method and application of catalyst. The alloy catalyst is shown as the formula I, namely TM(100-x)-REX. The alloy catalyst can be used for carrying out catalytic oxidation on cyclohexane to directly generate adipic acid, glutaric acid, succinic acid and KA oil in the presence of oxidizing agents such as air, oxygen gas or oxygen-enriched air, and the main product is adipic acid; the appropriate reaction conditions are as follows: the temperature is 130-150 DEG C and the pressure is 1.0-3.0MPa. The alloy catalyst has the characteristics of good activity, long service life, easiness in separation and the like; the metal alloy catalyst is characterized by being used for carrying out catalytic oxidation on cyclohexane to generate adipic acid, glutaric acid and succinic acid in the presence of air by one step, the reaction process is green and has an energy-saving effect, and the greenhouse gas emission can be reduced.

The invention relates to a supported platinum-cobalt catalyst and a preparation method thereof, and a method for producing pentanediol from biomass and biomass derivatives by using the supported catalyst. In the supported platinum-cobalt catalyst, different contents of platinum and cobalt are loaded on a carrier, and a weight ratio of platinum to cobalt is in a range of 1: 20 and 10: 1; and the carrier may be at least one selected from the group consisting of an acidic molecular sieve, activated carbon, ZrO2, Nb2O5 and Al2O3. The preparation method for catalyst is simple in process. The methodfor preparing pentanediol from biomass and the derivatives thereof by using the catalyst can realize high-selectivity preparation of 1,2-pentanediol or 1,5-pentanediol. Compared with traditional routes, the method provided by the invention has the obvious advantages of renewability of raw materials green, reaction process and the like, and has good application prospects.

The invention discloses an organic-inorganic hybrid cation exchange membrane for alkali recovery in manners of diffusion and dialysis as well as a preparation method and an application of the membrane. The diffusion and dialysis membrane consists of an organic phase and an inorganic phase, wherein the organic phase is polyvinyl alcohol (PVA); the inorganic phase is a mixture of silanol and alkoxy silane; and the cation exchange membrane has a moisture content of 38-105 percent, an ion exchange capacity of 0.30-2.10 mmol/g, an alkali dialysis coefficient of 0.010-0.025 m/h and a separation factor of 11.3-33.5. The organic-inorganic hybrid cation exchange membrane as well as the preparation method and the application of the membrane has the beneficial effects that the silanol containing an ion exchange group is directly introduced, the ion exchange capacity is obtained, therefore, the reaction process is simple and controllable; as the whole reaction process is carried out in a water phase, and no organic solvent is required, the reaction process is green and environmentally-friendly; and the obtained hybrid cation exchange membrane has high mechanical strength and high thermal stability and can be applied to the field of alkali recovery.

The invention discloses a preparation method and application of activated biogas residue hydrothermal carbon. The activated biogas residue hydrothermal carbon serves as an additive and is added in theanaerobic fermentation process taking fecal residue and waste water as a fermentation substrate, biogas residue is recycled, and the biogas production efficiency in the anaerobic fermentation processis improved. The preparation method and application of the activated biogas residue hydrothermal carbon have the beneficial effects that the biogas residue is recycled and used for anaerobic fermentation engineering, material circulation is achieved, and meanwhile the high value utilization path of biogas residue is developed; the cost of the preparation method is low, the technology is simple, extra raw material purchasing is not needed, and in the preparation process, the condition is mild, energy consuming is small, and the cost is low; and in addition, the biogas production in the anaerobic fermentation system and the content of methane in the biogas can further be improved, thus the fermentation efficiency is high, the fermentation system is stable, and the problems that existing biogas residue is difficult to consume, and the anaerobic fermentation efficiency of the fecal residue and waste water is low are solved.

The invention relates to the field of renewable energy technology and environmental protection and particularly relates to a method for preparing alkane type biodiesel by using tung oil. The method comprises the following steps: utilizing a porous inorganic material as a carrier and preparing a catalyst through a stepwise impregnation method; introducing hydrogen to reduce and activate the catalyst; introducing gaseous tung oil to carry out a hydrocracking reaction with the hydrogen; and collecting the alkane type biodiesel generated after the hydrocracking reaction. The cetane number of the biodiesel prepared by the method provided by the invention is as high as 81-90 and is similar to that of a petroleum diesel component; the reaction process is environmental-friendly, thereby being suitable for industrial popularization and application; the preparation process is simple, the reaction procedures are simple and the conversion rate is higher than 85%; the highly unsaturated fatty acid of the tung oil limits the utilization of the tung oil serving as a biodiesel raw material, and a catalytic cracking method is adopted to carry out hydrogenation and cracking on the tung oil so that the tung oil is converted into high-quality biodiesel, thereby providing a foundation and reference for full use of tung oil resources.

The invention discloses a preparation method of dimethyl ether. The preparation method comprises the following steps: mixing CO2 serving as raw material with H2, wherein the ratio of V(H2)/V(CO2) is 2-7; enabling the mixture to pass through a plasma-catalytic reactor of which the discharge spacing is 3-8cm, the voltage is 4-16kV and the frequency is 1-12kHz, wherein the plasma-catalytic reactor combines a plasma generating region and a catalyst storage region together and has a temperature control function; carrying out carbon dioxide hydrogenation reaction under the conditions that the reaction pressure is 1-5MPa, the reaction temperature is 200-280 DEG C and the reaction airspeed is 1000-5000h<-1>, wherein the main reaction product is dimethyl ether and the byproducts are carbon monoxide, methane, methyl alcohol and the like. The preparation method of dimethyl ether has the advantages of simple process, operation convenience, high reaction rate, high CO2 percent conversion and environment-friendly reaction process; the selectivity of dimethyl ether is high and the yield of dimethyl ether is high.

The invention discloses a biomass organic molecule oxidative cracking catalyst based on a modified H-Beta molecular sieve as well as a preparation method and application thereof. A metal component with better catalytic activity on ortho-diol is selected to be subjected to ion exchange with dealuminated H-Beta zeolite, so that the active component enters a framework of a dealuminated molecular sieve to serve as Lewis acid and an adsorption site in a reaction process, furthermore, the cracking activity and the reaction selectivity of the catalyst are effectively improved by utilizing the valence change of the metal ions and the synergistic effect of the metal ions and the H-Beta carrier, and the efficient and reusable catalyst meeting the ortho-diol C-C bond breakage is constructed. The prepared catalyst is used for the oxidative cracking reaction of phenyl glycol, the conversion rate of phenyl glycol is high, the yield of the oxidative cracking product reaches 95% or above, and the catalyst has unique advantages in the oxidative cracking reaction of biomass organic molecules.

The invention relates to organic synthesis, in particular to a preparation method for converting an organic carboxylic acid to an organic aldehyde. The method comprises the steps that: two reactions are carried out in a reaction container to convert a carboxyl in a carboxylic acid to a boroxyl compound first and then to oxidize theboroxyl compound to an aldehyde by an acetone solution of a trichloroisocyanuric acid with a mass 1.0 to 1.2 times that of the reaction substrate of carboxylic acid at a temperature of between 0 and 40 DEG C in the presence of 0.1 to 1.0 percent of 2,2,6,6-tetramethylpiperidine-1-oxyl against the mass of the reaction substrate of carboxylic acid and a base with a mass 1.0 to 1.2 times that of the reaction substrate of carboxylic acid. The method for preparing the aldehyde from the organic carboxylic acid by one-pot reaction of the invention has the advantages of moderate reaction conditions, rapid reaction, green reaction due to use of nontoxic oxidizer, simple process, easy operation, easy handling, and contribution to the realization of industrialization.

The invention discloses a method for preparing aldehyde/ketone by breaking a C-C bond, which comprises the following step of: in an organic solvent system under an anaerobic condition, by taking alcohol as a reaction raw material, selectively breaking a C-C bond under the combined action of an iron catalyst, organic alkali and an additive to obtain aldehyde/ketone. According to the method, the alcohol and the iron catalyst are cheap and easy to obtain, the substrate range is wide, post-treatment is simple, the yield and purity of the product are high, a new synthesis route and method are developed for aldehyde and ketone compounds, and the method has good application potential and research value.

The invention discloses a controllable preparation method for silica-gel chromatographic filler. The method comprises the specific steps: adding an MIm (N-methylimidazole) functional monomer into silica gel (SiO2) and CPTMS (3-chloropropyl trimethoxy silane), carrying out a reaction for 12 to 48 hours at the temperature of 60 DEG C to 150 DEG C with stirring, then, carrying out washing sequentially by methanol and water, and carrying out drying, thereby obtaining N-methylimidazole modified silica-gel chromatographic filler, wherein the mass ratio of the silica gel to the CPTMS is 0.5: (0.02 to 0.5); the mass/volume ratio of the silica gel to the MIm functional monomer is (0.5 to 2.5)g: (10 to 50)mL. According to the method, the amount of bonding of the functional monomer is controlled through strictly controlling the charging rate of the silica gel to the silane reagent; meanwhile, the excessive added functional monomer is a reactant and is also a dispersant, so that additional organic solvent is not required to be added; the functional monomer can be reused, so that the requirements of green chemistry are fully met.

The invention provides a preparation method of 6,6-dimethyl-3-oxadicyclo[3.1.0]hexane-2,4-diketone. The method comprises the following steps of: oxidizing first ethyl chrysanthemate serving as a raw material in water serving as a solvent by adopting potassium permanganate and adding sulfuric acid for hydrolyzing to generate 3,3-dimethyl-1,2-cyclopropane dicarboxylic acid; and performing cyclization on the 3,3-dimethyl-1,2-cyclopropane dicarboxylic acid in a system consisting of acetic anhydride and sodium acetate to generate the 6,6-dimethyl-3-oxadicyclo[3.1.0]hexane-2,4-diketone. The invention has the advantages that: water is taken as a reaction solvent, so that increase in cost and environmental pollution caused by the use of a large quantity of organic solvents are avoided; and a large amount of sulfur dioxide gas produced by the use of sodium metabisulfite is eliminated, so that environmental pollution and treatment of three wastes are greatly reduced. The method has the advantages of environmentally-friendly reaction process, low environmental pollution, simple process and low cost, thereby being beneficial to industrial production.