108results about How to "Short reaction residence time" patented technology

The invention discloses a method for preparing epoxidized fatty acid methyl ester with microreactor one-step method, comprising the following steps: injecting oil and fat, low-carbon alcohol and basic catalyst in a first microstructure reactor of a microchannel modularized reaction device, wherein the mole ratio of oil and fat to low-carbon alcohol is 1:11-17, and remaining for 3-10 min at the temperature of 65-85 DEG C; mixing outlet material of the first microstructure reactor with hydrogen peroxide, organic acid, acidic catalyst and stabilizing agent in a second microstructure reactor of the microchannel modularized reaction device, wherein the mole ratio of number of double bonds in organic acid to number of double bonds in oil and fat is 11-17:1, and remaining 1-5 min at the temperature of 65-95 DEG C; guiding the outlet material of the first microstructure reactor in a separator, standing for demixing to remove aqueous solution at lower layer; washing an organic phase at the upper layer with water till the pH is 6.5-7.5; and drying to obtain epoxidized fatty acid methyl ester.

The present invention relates to preparation of biodiesel oil, and is especially process of producing fatty ester as biodiesel oil with grease and alcohol as materials and through ester interchange reaction inside a micro channel reactor. The process has the following steps: injecting the mixture of grease, low carbon alcohol and acid catalyst into one micro channel reactor of 0.1-2.0 mm inner diameter; and reaction at normal pressure and 90-170 deg.c for 5-60 min to prepare fatty ester. The preparation process has the advantages of excellent material adaptability, continuous reaction, short reaction period, high fatty ester yield, etc.

The invention discloses a preparation method of a poly-metallic oxide-loaded catalytic ozonation catalyst and an application. The preparation method of the catalyst comprises the following steps of: a, activating diatomite, the diameter of which is 1-3mm, in a microwave generator, then immersing the diatomite in a NaOH solution, and taking out the diatomite to dry to obtain pre-treated diatomite; b, immersing the pre-treated diatomite in a mixed solution of copper nitrate, nickel nitrate, manganese nitrate, cobalt nitrate and ferric nitrate to obtain a catalyst precursor; and c, drying the catalyst precursor, and roasting the catalyst precursor at a high temperature to obtain the poly-metallic oxide-loaded catalytic ozonation catalyst. By selecting diatomite as a carrier which is cheap and easily available, the preparation process is simple, and the catalyst is easy to recover and suitable for industrial production on a large scale. The poly-metallic oxide-loaded catalytic ozonation catalyst prepared by the preparation method is used for treating antibiotic industrial wastewater.

The invention belongs to the technical field of lithium-ion batteries and particularly relates to an efficient method for preparing difluorophosphates. The method comprises the following steps: metering a hexafluorophosphate solution with the concentration being 5wt% to 50wt% and a cyclosiloxane or an acetal, then, introducing the metered materials to a microchannel reactor, carrying out a reaction for 60 to 900 seconds at the temperature of 20 DEG C to 150 DEG C, carrying out membrane filtration on an obtained reaction solution, and then, carrying out concentrating and drying, thereby obtaining a corresponding difluorophosphate product. The method disclosed by the invention has the advantages that the process route is simple, the raw materials are readily available, the reaction efficiency is high, the energy consumption is low, the product purity is high, and the like.

The invention belongs to the field of organic synthesis, and in particular relates to a production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series. The production process comprises the following steps of: adding materials including para aminophenol hydrochloride, hydrochloric acid and water into a dosing kettle and mixing the materials; after mixing the materials, adding the mixture into at least three serial reaction kettles, wherein the pressure in each reaction kettle is kept in balance, and a potential difference between the upper level and lower level of each reaction kettle is kept, so that reaction materials flow to the next stage of reaction kettle from the previous stage of reaction kettle for hydrolysis reaction; enabling a hydrolysate to flow out of the last stage of reaction kettle; enabling the hydrolysate to flow into a condenser; introducing the cooled hydrolysate into a continuous extraction tower; desolventizing an organic phase of the extraction tower to obtain a hydroquinone crude product. As water and acid are repeatedly used in a hydroquinone production process, waste water is remarkably reduced; as continuous production is adopted, the production efficiency is high; the production process has the advantages of high yield and simplicity in process control.

The invention relates to a supergravity field micro-reactor for preparing a nanometer material. The supergravity field micro-reactor comprises a micro-reaction assembly, a material receiving groove provided with a material outlet, a first motor, a transmission system, a material inlet system and a support system, wherein the micro-reaction assembly comprises an upper disc and a lower disc, micro-grooves are respectively distributed on the bottom surface of the upper disc and the top surface of the lower disc, the center position of the lower disc is provided with a material inlet micro-pore channel, a 0.03-0.1 mm gap is arranged between the bottom surface of the upper disc and the top surface of the lower disc after the combination, the first motor drives the transmission system to operate so as to make the upper disc and the lower disc in the micro-reaction assembly rotate in opposite rotation directions, and an upper disc lifting system can be additionally arranged so as to conveniently adjust the gap between the bottom surface of the upper disc and the top surface of the lower disc in the micro-reaction assembly and wash the upper disc and the lower disc. With the supergravity field micro-reactor of the present invention, the nanometer material is prepared by using the liquid phase precipitation method, such that the high dispersion property and the uniform particle distribution of the nanometer material can be maintained while the treatment capacity can be increased and the clogging of the micro-reaction assembly can be avoided.

The invention discloses a method for preparing dimethyl diallyl ammonium chloride, which comprises the following steps: mixing a 20-50 wt% dimethylamine aqueous solution and a 25-40 wt% sodium hydroxide water solution; respectively and simultaneously pumping chloropropene and the mixed solution into a microchannel modular reactor, and keeping at the temperature of 25-65 DEG C for 5-20 minutes; and introducing the discharged material of the microchannel modular reactor into a separator, standing to stratify, removing the supernatant turbid oil, taking the understratum water layer, regulating the pH value to 5-7, and carrying out vacuum distillation and activated carbon adsorption decolorization to obtain the high-grade dimethyl diallyl ammonium chloride water solution. The preparation method disclosed by the invention is a continuous process, and has the characteristics of controllable preparation technique, high safety, mild reaction conditions, short reaction retention time and stable product quality; and the production device is simple, and is easy for disassembly and assembly and convenient to carry and move. The device can be conveniently adjusted by simply increasing or decreasing the quantity of the microchannels.

The invention discloses a tubular electrolytic cell for domestic sewage treatment. The tubular electrolytic cell is characterized in that the electrolytic cell is formed by sleeving a cathode external tube and an anode inner tube, wherein the cathode external tube is a titanium tube of which one end is sealed, a nozzle flange and a water inlet adapter tube are arranged at the other end of the titanium tube, and the water inlet adapter tube is perpendicular to the cathode external tube; the anode inner tube is a tube section of which one end is provided with a water outlet adapter tube; a ruthenium coating is arranged on an outer surface of the tube section; the water outlet adapter tube and the anode inner tube are in a manner of concentric circles; the anode inner tube is fixedly sleeved in the cathode external tube through a tetrafluoroethylene supporting piece; and the water outlet adapter tube is sleeved with a tetrafluoroethylene washer and is fixedly connected with a nozzle flange bolt through a flange cover. Compared with the prior art, the tubular electrolytic cell has the advantages that the operations of degradation of organic matters and sterilization and disinfection are performed in the same equipment, the reaction retention time is short, the tubular electrolytic cell is high in treatment efficiency, long in service life of electrodes, simple and convenient to operate, stable in operation and low in cost and is particularly suitable for narrow and small spaces of ship and marine structures.

The invention belongs to the technical field of organic synthesis, and particularly relates to a phenol and hydrogen peroxide hydroxylation microchannel reaction method. The method comprises the steps of mixing the raw materials phenol, water, hydrogen peroxide and a water-soluble catalyst according to certain proportions to prepare a raw material solution, adding the raw material solution into a mixing tank, setting the reaction temperature of a microchannel reactor to be 30-150 DEG C, and inputting the raw material solution into the microchannel reactor at the flow rate of 5-150 mL/min through continuous charging and discharging for hydroxylation reaction, so that catechol and hydroquinone are obtained. The method is simple, operation is convenient, the conversion rate is high, selectivity is high, efficiency is high, and the content of tar in reaction liquid is low.

The invention relates to a method for producing stearoyl chloride and homologs thereof by liquid-phase phosgenation, which is characterized in continuous operation. The method comprises the following steps: simultaneously adding a raw material A, a catalyst and phosgene into a main photochemical reaction kettle (5), reacting in the main photochemical reaction kettle (5) and a photochemical reaction mature kettle (6), removing the phosgene by a negative pressure phosgene removal column (7), and decolorizing by a stearoyl chloride product decolorizing device (8) to continuously generate the stearoyl chloride product, wherein the raw material A is one of stearic acid and homologs thereof, or the mixture of two or three of the homologs. The invention solves the problems of long reaction time, low phosgene utilization ratio, multiple byproducts, low product purity, difficulty in absorbing and utilizing the generated HCl and CO2 gases, and the like in the existing technique for producing stearoyl chloride by gas-phase phosgenation, and provides a high-efficiency environment-friendly high-quality production technique of stearoyl chloride, homologs and homologic mixtures thereof.

The invention discloses a method for preparing methoxyacetone by using a microreaction device. The method comprises the following steps: mixing methanol with a basic catalyst to obtain a methanol solution; then pumping the methanol solution and epoxypropane into a micromixer in the microreaction device; sufficiently mixing and then introducing a mixed solution into a first microreactor in the microreaction device for reacting; after the reaction is ended, carrying out neutralizing and flash evaporation and concentration on a reaction solution to obtain 1-methoxy-2-propanol; pumping the 1-methoxy-2-propanol and an aqueous solution of sodium hypochlorite into a second microreactor in the microreaction device for reacting to obtain the methoxyacetone. According to the preparation method of the methoxyacetone, disclosed by the invention, the problems in the existing production can be overcome, the use of a complex catalyst is avoided, and the content of a byproduct is reduced; the production cost is low, the continuation degree of the process is high; the safety of the production process can be substantially improved; the quality of a product is improved.

The invention relates to the field of mesophase pitch production, and discloses mesophase pitch, and a continuous production method and a continuous production system thereof. The system comprises a continuous heating feeding system (7) and a pitch polymerization reaction system (8) at downstream of the continuous heating feeding system (7); a discharging port of the continuous heating feeding system is connected with a feeding port of the pitch polymerization reaction system; the continuous heating feeding system comprises a pitch melting unit (71) and a pitch heating unit (72); the pitch polymerization reaction system comprises two to eight stages of reaction kettles which are connected in series and at least one stage of standby reaction kettle; the pitch heating unit comprises spaces for holding pitch and molten salt respectively. The method comprises the following steps: melting pitch; heating to a preset temperature to form pitch melt; adding the pitch melt into the pitch polymerization reaction system to perform contact reaction; heating the molten pitch through the molten salt, wherein the polymerization reaction system comprises two to eight stages of reaction kettles which are connected in series and at least one stage of standby reaction kettle. The produced mesophase pitch is high in quality controllability, uniform in softening point and high in stability; continuous production can be realized.

The invention relates to a method for continuously preparing ethylene carbonate. The method comprises the following steps: (1) mixing ethylene carbonate with a catalyst and water to obtain a catalystsolution A; (2) introducing CO2 into a reaction system, and performing back pressure regulation on the pressure of the reaction system to a required pressure by using a back pressure valve; (3) introducing the catalyst solution A and ethylene oxide into a micro-mixer, and quickly and uniformly mixing to obtain an ethylene oxide mixed solution B in which a catalyst is dissolved; (4) continuously introducing the mixed solution B and CO2 gas into a micro-mixer to obtain a gas-liquid mixture C, and enabling the gas-liquid mixture C to enter a tubular reactor for reaction; (5) introducing an obtained reaction liquid into a flash tank, and carrying out flash evaporation to separate out unreacted ethylene oxide, CO2 and water to obtain a primary product; and (6) rectifying the primary product obtained in the step (5) to obtain the product ethylene carbonate. The method is safe and efficient, and the reaction residence time is greatly shortened; the reaction efficiency is high, and the conversion rate of ethylene oxide is close to 100% in a short reaction residence time.

The invention provides a continuous production method for a vulcanization accelerator DPG. The method comprises the following steps that (1) diphenylthiourea, a catalyst, ammonium hydroxide and an organic solvent are mixed to obtain a reaction raw material mixture; (2) the reaction raw material mixture and an oxidizing agent are subjected to an oxidation reaction in a continuous flow reactor to obtain a reaction product; (3) the reaction product is post-treated to obtain the vulcanization accelerator DPG, wherein the organic solvent in step (1) can dissolve the diphenylthiourea and the vulcanization accelerator DPG. The method reduces the pressure in the reaction process, improves the utilization rate of the raw materials, stabilizes the product quality, greatly shortens the reaction timecompared with a conventional technology, improves the reaction yield, and effectively overcomes the disadvantage of traditional kettle type batch production.