127 results about "Recyclable catalyst" patented technology

The invention provides a method for preparing diesel components by catalytic hydrodeoxygenation of vegetable oil, which prepares high heat-value alkane by catalytic hydrodeoxygenation of the vegetable oil. The method comprises the following reaction steps: adding the vegetable oil, barium sulphate-loaded palladium serving as a catalyst, as well as a solvent selected from n-hexane, n-heptane, n-octane and dodecane to a reactor; supplying hydrogen; allowing reaction pressure to be between 1 and 10 MPa; stirring and heating at 230 to 320 DEG C; performing reaction for 3 to 12 hours and then stopping the reaction; allowing the catalyst and liquid products to automatically separate after the obtained product is cooled to room temperature; and obtaining the diesel components containing high heat-value alkane without centrifugation, filtration and other complicated post treatment. The method has the advantages of simple preparation process, low reaction temperature, low solvent consumption, no cracking of carbon chain parts of the oil, high combustion heat value of target products and recyclable catalyst.

Described herein is a novel, cost effective, stable and recyclable catalyst composition i.e. A-B-OMS, wherein ‘A’ is selected from noble and transition metals; ‘B’ is selected from alkali or alkaline earth metals; and OMS is octahedral molecular sieve which includes synthetic todorokite (OMS-1) and cryptomelane (OMS-2); and characterization thereof. Further the invention provides base free green process for selective aerobic oxidation of 5-hydroxymethylfurfural (HMF) catalysed by said catalyst composition under optimized reaction conditions to obtain high yield of 2,5-furandicarboxylic acid (FDCA) in a shorter span of time. Invention also provides for selective oxidation of glucose to Gluconic Acid, furfural to furoic Acid and glycerol to Glyceric acid. Invention can also applicable for the selective oxidation of hexoses, pentoses, disaccharides to corresponding acids.

The invention discloses a one-step synthesis method of N, N-diethyl-3-methyl-benzamide with a fixed bed, which comprises the steps that: 3-methyl benzoic acid and diethylamine are stirred under a solvent system for reaction to generate a complex salt compound of the 3-methyl benzoic acid and diethylamine, and then materials are fed to the catalyzing fixed bed continuously under constant temperature and constant pressure, then dehydrated continuously to obtain a crude product; the solvent is recovered by distillation under ordinary pressure; finally the pure product of the N, N-diethyl-3-methyl-benzamide is obtained after rectification under vacuum. The molar ratio of the 3-methyl benzoic acid to the diethylamine to the solvent is 1.0: (1.0-15.0): (0-25.0), the mass velocity is 0.1 h<-1> to 20.0 h<-1>, the reaction temperature of the fixed bed is 60 DEG C to 550 DEG C and the reaction pressure of the fixed bed is 0.1 MPa to 5.0 MPa. The synthesis technology has the advantages of short technological process, high conversion ratio, good selectivity, high yield rate, small amount of waste gas, waste water and waste residues, reproducible and recyclable catalyst and low cost.

The invention provides a new method for converting a lignin model compound dimer and a lignin raw material to a corresponding aromatic compound through a hydrogen transfer reaction by taking ReO<x>/AC as a catalyst. According to the method, one or two micromolecular alcohol is taken as a reaction regent, ReO<x>/AC is taken as a catalyst, and the lignin model compound and the lignin raw material are catalyzed and converted to a micromolecular aromatic chemical in a mild condition. Compared with a traditional lignin depolymerization method, the method has distinct features: no addition of hydrogen and oxygen sources, mild reaction conditions, high selectivity of monophenol products, fast reaction speed, recyclable catalyst, and simple operation. The aromatic chemicals can be prepared from renewable lignin sources, a mild depolymerization strategy without consuming hydrogen sources is developed, and a new approach is developed for producing an aromatic compound in a non-petroleum route.

The invention relates to a preparation method for a substituted molybdophosphate crystal catalyst. The design and synthesis of a high-activity, selective, environmentally-friendly and recyclable catalyst have an important significance in the research and chemical industry fields. The preparation method provided by the invention comprises two steps: step one, mixing sodium molybdate Na2MoO4.2H2O, transition metal sulfate, phosphoric acid H3PO4 and 1,3-bis(4-pyridyl)-propane or ethylene diamine at a molar ratio of 6: 2.9: 30: 2.6 in water with the molar fraction of 2000 and stirring for 30 minutes to obtain a mixed liquid; and step two, enclosing the mixed liquid obtained in the step one in a polytetrafluoroethylene-lined stainless steel reaction kettle at a filling degree of 60-70%, then placing the reaction kettle in a 165 DEG C oven to heat and crystallize for 7 days, and then naturally cooling to room temperature to obtain the dark red polyacid crystal catalyst. The preparation method can be used for preparing the substituted molybdenum phosphate crystal catalyst.

The invention relates to a continuous production method of propyl acetate, and is characterized by comprising the following steps: adding ionic liquid dissolving inorganic compound of the Lewis acid into the glacial acetic acid and the normal propyl alcohol as the catalyst; heating the components in an esterification kettle for esterification reaction; adding the mixed raw material of the glacial acetic acid and the normal propyl alcohol with the same proportion into the esterification kettle continuously after the reaction begins to reflux; separating the propyl acetate generated in the reaction in an esterification tower, and sending the unreacted raw materials back to the esterification kettle from the bottom of the kettle to continue the reaction; steaming the water and part of the normal propyl alcohol from the tower top; after the cooling, refluxing one part of the steam to the tower top, and sending the other part of the steam to a stratifying device at the tower top; refluxing part of the aqueous phase at the lower layer to the esterification tower through a reflux ratio distributor, and recovering the other part of the aqueous phase; and sending the ester phase at the upper layer to the production purification stage for the further separation to obtain the propyl acetate product. The method of the invention has simple process, high esterification conversion rate, good product selectivity, recyclable catalyst, no device corrosion, environmental protection, simple synthesis method of the selected ionic liquid catalyst, and better solubility of the acid inorganic compound.

The invention provides a synthesis method for a cyclic carbonate under catalysis of a supported acidic ionic liquid catalyst, relates to a synthesis method for the cyclic carbonate, and mainly solves the technical problems that the catalyst is difficult to recover and the energy consumption is high during the separation process in the existing cyclic carbonate preparation methods. The method provided by the invention comprises the following steps of: adding the supported acidic ionic liquid catalyst to an autoclave, adding an epoxy compound, closing the autoclave, introducing carbon dioxide to the autoclave until the internal pressure of the autoclave is 0.5-5 MPa, heating to the reaction temperature of 80-200 DEG C, reacting while maintaining the pressure and temperature for 1.0-10 hours, cooling the autoclave to room temperature, slowly discharging carbon dioxide, filtering and distilling under reduced pressure to obtain the cyclic carbonate. The catalytic synthesis method has the advantages of mild reaction conditions, high catalyst activity, easy separation of the catalyst from a product, recyclable catalyst, etc.

The invention provides a method for preparing phenol and acetone by composing hydrogen peroxide iso-propyl benzene, which is characterized in that the method adopts a smectite solid-acid catalyst modified by inorganic ammonium salt as a reaction catalyst to make the hydrogen peroxide iso-propyl benzene have the decomposition reaction, with a decomposition temperature of between 35 and 80 DEG C, and a decomposition pressure of 0.1 to 5atm. The method makes the reaction under a mild condition, and has advantages of easy control of extent of reaction, less by-products, non corrosion, easy separation of products, recyclable catalyst, and non phenolic wastewater.

The invention discloses a method for preparing HMF (5-hydroxymethylfurfural) from glucose by lower-temperature catalysis with boehmite. The method specifically comprises the following steps: boehmitegamma-AlOOH and glucose are added to dimethyl sulfoxide, the substances are mixed and transferred to a position at 80-180 DEG C for a stirring reaction, deionized water is added to a reaction liquid after the reaction for quenching treatment, then centrifugation is performed, an upper liquid is collected, and a degradation liquid containing HMF is obtained. When HMF is prepared from glucose by catalysis with the method, the method has the characteristics of low temperature, high efficiency (high HMF yield and high selectivity), easily separable and recyclable catalyst, low energy consumption and the like, and has quite high application value; a large quantity of side effects can be avoided, product selectivity can be improved, and product separation cost can be reduced.

The invention relates to a preparation method of a compound ecological fertilizer from plant stalks. The compound fertilizer is prepared by degrading a main raw material of plant stalks under the action of small molecule organic acid in the presence of a solid super acid catalyst, and combining with distiller's grains, bone meal, bran leather, humic acid, and NPK fertilizer. The raw materials consist of, by weight, 60-80 parts of plant stalks, 5-10 parts of distiller's grains, 5-15 parts of bone meal, 5-15 parts of wheat bran, 5-10 parts of humic acid and 30-50 parts of NPK fertilizer. The method uses a catalytic degradation technology for preparation of the compound ecological fertilizer, reaches high catalytic degradation efficiency of stalks, completes the conversion from stalks to compound ecological fertilizer within 16h at the highest speed, and has the advantages of simple operation, low cost, recyclable catalyst, and no corrosion of equipment, and can quickly obtain the product. The prepared compound ecological fertilizer can effectively enhance fertilizer efficiency, stimulate crop growth, control pests and diseases, improve the quality of agricultural products, and the absorb soil pollutants, improve the water retention capacity of soil and fertilizer and improve soil structure, and is conducive to the sustainable development of agriculture.

The invention relates to a method for synthesizing 1,1,1,3,5,5,5-heptamethyltrisiloxane by continuous catalysis of a solid phase catalyst. Hexamethyldisiloxane and straight chain methyl hydrogen polysiloxane in a molar ratio of 3:1-2:1 are taken as raw materials, strongly acidic ion exchange resin is taken as the solid phase catalyst, the reaction temperature is 40 to 80 DEG C, a fixed bed reactor is adopted, the raw materials pass through the reactor filled with the ion exchange resin at a certain flow rate, the retention period is 5 to 10 hours, the conversion rate of the raw materials is ensured by the retention period of the reaction through controlling the flow rate of the reaction product, the continuous reaction production is realized, and the reaction product is subjected to low fraction and high fraction removal rectification to form the 1,1,1,3,5,5,5-heptamethyltrisiloxane product with the purity of over 99 percent. The method has the advantages of readily available raw materials, no three-waste emission, simple process, continuous production, high-efficiency and stable reaction, simple separation, recyclable catalyst, conversion per pass of the raw material straight chain methyl hydrogen polysiloxane of over 32 percent, good product quality and low production cost.

The invention discloses a method for preparing an acylferrocenyl hydrazinodithio acid ester Schiff base. The method comprises the following steps: adding formula amounts of choline chloride (A mol) and methanesulfonic acid (B mol) into a reaction vessel, and performing stirring at 80 DEG C until complete dissolving in order to obtain a eutectic solvent; adding formula amounts of acylferrocene (C mol) and hydrazinodithio acid ester (D mol), slowly heating the obtained solution to 80 DEG C, performing TLC monitoring until a reaction is finished (1 h), cooling the obtained reaction solution to room temperature to precipitate a solid, carrying out suction filtration, washing the solid with a small amount of water, and drying the washed solid to obtain the product with a yield of 90% or more; and recovering the obtained filtrate to obtain the eutectic solvent, wherein a ratio of A:B:C:D is 1:(1-4):(1-1.5):(1-1.5). The method has the advantages of short reaction time, high efficiency, high yield, high purity of the product, recyclable catalyst, greenness, environmental protection and cost reduction.

The invention relates to the technical field of preparation of cellulose hydrolysis catalysts., and discloses an application of a catalyst based on an organic metal framework UiO-66 in cellulose hydrolysis. The catalyst is one of UiO-66, UiO-66-X, HPW/UiO-66 and HPW/UiO-66-X, wherein -X is one of-NH2, -COOH and -2COOH; the UiO-66 and the UiO-66-X are prepared from ZrCl4 and an organic ligand through a reaction; and the HPW/UiO-66 and the HPW/UiO-66-X are UiO-66 and UiO-66-X loaded with phosphotungstic acid. When the catalyst is applied to cellulose hydrolysis, the mass ratio of the catalyst tocellulose is 1:(5-10). The organic-inorganic hybrid recyclable catalyst based on the organic metal framework UiO-66 prepared in the invention has excellent catalytic performance when being used in cellulose hydrolysis reaction.

A method for synthesizing dimethyl methylphosphonate. Under protection of inert gas, A raw material trimethyl phosphite and a proper amount of benzene sulfonic acid catalyst are mixed and stirred; and a the mixture is subjected to a rearrangement reaction through a pressurized heating way, so as to synthesize a target product dimethyl methylphosphonate with yield up to 93% and purity higher than 99%. The invention has advantages of easily available raw materials, short synthesis time, simple production control, cheap and recyclable catalyst and little pollutant emission.

The invention provides a reaction method for selectively synthesizing aromatic aldehyde or aromatic carboxylic acid. Toluene aromatic hydrocarbon without substituent or with substituent on a benzene ring is used as a raw material, an inorganic salt of ferric iron is used as a catalyst, air or oxygen is used as an oxidizing agent, a mixed solution of acetonitrile and water is used as a solvent, theraw material is oxidized by adjusting the dosage of the catalyst to obtain aromatic aldehyde or aromatic carboxylic acid, and the aromatic aldehyde or aromatic carboxylic acid is irradiated by ultraviolet light for 10-16 hours. Aromatic carboxylic acid obtained under the condition that the dosage of the catalyst is 5-50% mol of aromatic hydrocarbon is used as a main product, wherein the use amount of the catalyst is 70-200% mol of aromatic hydrocarbon. The reaction method provided by the invention has the characteristics of atom economy and high selectivity, uses the metal iron salt with richearth content for catalysis, and has the advantages of mild conditions, recyclable catalyst and solvent and the like.

The invention discloses a treatment method for electroplating wastewater and sludge. The treatment method comprises the following steps: (1) evaporating and concentrating electroplating wastewater, discharging condensed water or recycling the condensed water to an electroplating process, and mixing and slurrying the concentrated solution, electroplating sludge and a carbon source; (2) carrying outmicrowave hydrothermal treatment on slurry under the conditions that a temperature is 130-250 DEG C and a pressure is 2-10 MPa so as to allow a carbon source and metal elements in the slurry to reactin situ to generate a carbon-based catalyst; (3) introducing an oxidant, carrying out catalytic wet oxidation on the slurry having undergone hydro-thermal treatment, carrying out solid-liquid separation after the reaction is finished, carrying out drying treatment on a solid phase, and recycling the treated solid phase as a catalyst; and (4) carrying out electric flocculation on a filtrate obtained by solid-liquid separation, wherein solid slag of electric flocculation is partially recycled to the electroplating sludge. According to the method, deep harmless and reduction treatment of the electroplating wastewater and the electroplating sludge is realized, and meanwhile, the recyclable catalyst for wet oxidation wastewater treatment is obtained through resource utilization.

The invention discloses an NHPI catalyst grafted by utilizing imide bonds, a preparation method and application thereof. The catalyst comprises a SiO2 carrier and N-hydroxyphthalimide grafted on the SiO2 carrier, wherein the N-hydroxyphthalimide is grafted on the SiO2 carrier through imide bonds. The preparation method of the catalyst comprises the following steps: (1) modifying the surface of a carrier SiO2 by using aminopropyltriethoxysilane to obtain a surface ammoniation carrier SiO2-APTES; (2) dissolving cyclized dianhydride and the surface ammoniation carrier SiO2-APTES in a solvent, andgrafting through imide covalent bonds to prepare grafted anhydride; and (3) carrying out imidization treatment on the grafted anhydride to prepare the grafted NHPI catalyst, wherein the catalyst canbe used as a recyclable catalyst to be applied to preparation of acetophenone. The catalyst has the advantages of no loss of active components in the catalytic reaction, good stability, high active site density and good catalytic effect, and realizes the cyclic utilization of the catalyst.

The invention provides a green method for catalytically synthesizing 2'-aminobenzothiazolyl-arylmethyl-2-naphthol, belonging to the field of organic chemical synthesis. The method comprises the following steps: carrying out synthetic reaction, wherein the aromatic aldehyde:2-aminobenzothiazole:beta-naphthol mol ratio is 1:1:1, the bissulfonate acidic ion liquid catalyst accounts for 5-8 mol% of the aromatic aldehyde, the reaction temperature is 80-95 DEG C, the reaction time is 3-10 minutes, and the volume (ml) of the reaction solvent water is 3-5 times of the molar weight (mmol) of the aromatic aldehyde; and after the reaction is finished, cooling to room temperature, carrying out vacuum filtration, recrystallizing the filter residue with 95% ethanol, and carrying out vacuum drying to obtain the 2'-aminobenzothiazolyl-arylmethyl-2-naphthol.Compared with other synthesis methods, the invention has the characteristics of high catalytic activity, low catalyst consumption, recyclable catalyst, low environmental pollution in the whole process, simple and convenient after-treatment and the like.

The invention provides a preparation method of (S)-(+)-ethyl mandelate by using biocatalytic ethyl benzoylformate and taking saccharomyces cerevisiae with CGMCC No.2266 as a biocatalyst. The method comprises the following steps of: performing a conversion reaction for 8 to 120 hours at a temperature of between 20 and 35 DEG C in a water and n-hexane two-phase system by using ethyl benzoylformate as a substrate and the saccharomyces cerevisiae with CGMCC No.2266 as a biocatalyst; and separating and purifying the conversion solution to obtain (S)-(+)-ethyl mandelate. The microbial conversion method has the advantages of mild reaction condition, friendly environment, high product optical purity, high substrate conversion rate, simple separation and purification process and recyclable catalyst, and is suitable for industrial production.

The invention provides a petroleum fluid catalytic conversion control method. After being heated, raw oil enters a reactor and carries out catalytic conversion reaction after being mixed with recyclable catalyst which enters the reactor. The method is characterized in that the preheating temperature of the raw oil needs to be regulated when controlling the reaction temperature of the reactor. The control method overcomes the defects in the prior art, enhances the selectivity and the conversion rate of the fluid catalytic conversion reaction, improves the product distribution, enhances the yield of light distillate and has the characteristics of having reliable running and flexible regulation and saving energy and investment.