84results about How to "Safe and controllable process" patented technology

The invention discloses a preparation method for a nitrogen-containing activated carbon catalyst. The method comprises the following steps of: 1) pre-treating a carbonized material; 2) introducing a nitrogen-containing reagent, wherein the nitrogen-containing reagent is selected from carbamide, melamine or phenylamine, and the adding molar ratio of the carbonized material to the nitrogen-containing reagent is 1:(0.1 to 10); 3) activating in one step; and 4) refining. Compared with the traditional nitrogen-containing activated carbon catalyst, the catalyst prepared by the method has the advantages of high activity, long service life, high yield of reaction product, i.e., glyphosate when the catalyst is applied to the oxidization of N-phosphonomethyl aminodiacetic acid, and the like. The preparation method has the advantages of low pollution, safe and controllable process, short high-temperature activation period, low energy consumption, simple process, low cost and the like.

The invention discloses a method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as an activator. According to the method, asphalt or coal tar which is used as a raw material is uniformly mixed with mixed molten salts; under protection of argon or nitrogen, the mixture is placed in a carbonization furnace to be carbonized; and finally, the carbonized product is crushed, washed and dried to obtain active carbon. The active carbon has high specific surface area and effective mesopore-micropore pore size distribution, and has high electrochemical specific capacity and good high-current charge discharge capability and cycling stability.

The invention relates to a synthesizing method of an epoxy fatty acid ester. According to the method, formic acid (acetic acid) contacts and is mixed with hydrogen peroxide in a first micro-reactor, such that a peroxidation reaction is initiated; when a material of the initiated peroxidation reaction flows out of the micro-reactor, the reaction of the material is continued for several minutes in an extension pipe (capillary or micro-channel) connected to the outlet of the first micro-reactor, such that peroxyformic acid (peroxyacetic acid) is produced; the in-situ produced peroxyformic acid (peroxyacetic acid) contacts and is mixed with non-reacted hydrogen peroxide and fatty acid ester in a second micro-reactor, such that an epoxidation reaction is initiated; the reaction of the material of the initiated epoxidation reaction is continued for several minutes in an extension pipe connected to the outlet of the second micro-reactor, or other kettle-type material storage devices, such that epoxy fatty acid ester is produced. According to the method, organic acid peroxidation and double-bond epoxidation reactions are integrated in series, such that epoxy fatty acid ester is obtained by continuous synthesis. The process is safe and controllable. Under the optimized condition, double bond conversion rate in fatty acid ester is higher than 90%, and epoxy fatty acid ester selectivity is higher than 80%.

The invention discloses a method for continuously synthesizing dimethyl sulfone, and belongs to the technical field of organic synthesis. According to the method provided by the invention, dimethyl sulfone is prepared in a continuous flow microchannel reactor by using dimethyl sulfoxide as a raw material and using the aqueous solution of hydrogen peroxide as an oxidant. The method has the advantages of mild condition, short reaction time and high utilization of raw materials, can realize effective control in the reaction process, is safe and stable, realizes continuous operation and has high production efficiency.

The invention discloses an oxidizing type catalyst. The oxidizing type catalyst is used for purifying tail gas of heavy disease vehicles, and has high NO (nitric oxide) oxidizing ability in the cold start phase at low temperature, namely that NO is oxidized and converted into NO2 (nitrogen dioxide), so as to provide NO2 for the catalyzing reaction of downstream catalyzing units, such as DPF (diesel particulate filter) and SCR (selective catalytic reducer); finally, the NOx (oxynitride) is converted into N2 (nitrogen), so as to purify the NOx. A catalyst coating layer is coated by sections, andis mainly used for improving the ability of converting NO into NO2 at low temperature section, and accelerating the temperature for converting NO into NO2 to move towards the low temperature direction; a carrier material consists of cerium oxide and composite oxide thereof, and the coating is coated by sections, and is of a single-layer structure; the active components contain noble metals (Pt (platinum) and Pd (palladium)), and the total content is controlled within 5 to 15 g/ft3. The oxidizing type catalyst has the advantages that the preparation technology is simple, the cost is low, the property is stable, the good ability of converting NO into NO2 at low temperature is realized, and the oxidizing type catalyst is suitable for industrialized production.

The invention describes a ski (2) or a snowboard in the form of a board-type gliding device (1). By reference to the width (13) of the gliding board body, at least one slot (14) is provided in its middle portion extending in the depth direction—arrow (15)—from the top face (7) of the gliding board body in the direction towards the running surface facing (10) and in its longitudinal direction essentially parallel with the longitudinal direction of the gliding board body. This at least one slot (14) is provided with a view to causing a cross-sectional weakening and reducing the stiffness of the gliding board body transversely to its longitudinal direction. Also provided is at least one geometry-influencing means (19), by means of which the cross-sectional shape or contour of the gliding board body is variable as a function of load and/or can be manually varied. The geometry-influencing means (19) comprises a plate-type force-transmitting element (44), which extends across more than 50% of the length of the gliding board body and is supported within its longitudinal extension, at least in part-portions, on the top face (7) of the gliding board body so as to transmit load, and the plate-type force-transmitting element (44) is disposed so that it overlaps the least one slot (14) in the longitudinal direction and bridges it transversely to the longitudinal direction of the slot (14).

The invention discloses a method for preparing benzaldehyde by continuously oxidizing methylbenzene through a tubular reactor, and belongs to the technical field of organic synthesis processes. The method is a process technology that a methylbenzene compound is adopted as a raw material, a metal ion complex of one or more of cobalt, molybdenum and bromine is adopted as a catalyst, hydrogen peroxide is adopted as an oxidizing agent, acetic acid is adopted as a solvent, and methylbenzene is continuously oxidized in the tubular reactor to prepare benzaldehyde. The method is mild in condition, short in reaction time, high in raw material utilization rate, capable of achieving effective control in the reaction process, safe, stable and high in production efficiency and achieves continuous operation.

The invention relates to a ski (2) or a snowboard in the form of a board-type gliding device (1), comprising a multi-layered gliding board body. A force-transmitting element (13) is supported on the top face (7) of the gliding board body, the top face of which is provided as a means of supporting a binding mechanism (3) for a connection to a sports shoe which can be released as and when necessary. The force-transmitting element (13) is of a plate-type design and extends across more than 50% of the length of the gliding board body. Within its longitudinal extension, the plate-type force-transmitting element (14) is supported in at least part-portions on the top face (7) of the gliding board body so as to transmit load and is connected to the gliding board body by means of a plurality of connecting zones (30) disposed in the longitudinal direction of the plate-type force-transmitting element (13).

The invention discloses a method for recovering platinum and rhenium from a platinum-rhenium catalyst. The method comprises the following steps of 1, carrying out electrodissolution reaction on the platinum-rhenium catalyst so as to obtain slurry; 2, centrifuging the slurry so as to obtain supernatant and precipitates; 3, adjusting the pH value of the supernatant to be 1-4 and then carrying out adsorption with resin; 4, after mixing ammonia water and an ammonium chloride solution, carrying out desorption on the resin subjected to absorption and carrying out evaporation and concentration on anobtained desorption solution so as to obtain ammonium rhenate; and 5, leaching the precipitates by using aqua regia, carrying out centrifuging to obtain supernatant, obtaining platinum-contained precipitates from the supernatant by adopting an ammonium chloride precipitation method and then carrying out hydrazine hydrate reduction so as to obtain platinum powder. The method has the advantages thatthe rhenium in the platinum-rhenium catalyst is selectively dissolved through electrochemical action, so that the rhenium and the platinum are separated and then are recovered separately through an ion exchange method and an aqua regia dissolution-ammonium chloride precipitation method, and therefore the separation efficiency of the rhenium and the platinum can be improved, and the quality and the recovery rate of obtained products are relatively high.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a process for preparing phenylenediamine through a micro-reaction technology. The method comprises the following steps: metering to-be-reduced nitro aromatic hydrocarbon, a solvent, a catalyst and hydrogen, continuously feeding into a hydrogenation micro-reactor, and carrying out a hydrogenationreduction reaction, wherein the to-be-reduced nitro aromatic hydrocarbon can also be prepared by adopting a continuous micro-nitrification process. According to the invention, a hydrogenation reduction reaction is carried out by adopting a hydrogenation micro-reactor, so that the process is safe and controllable; and particularly nitro aromatic hydrocarbon is prepared by combining a micro-nitrification reactor, and the material directly enters the hydrogenation micro-reactor without separation, so that the method is a continuous production process containing the micro-reactor, can prevent accumulation of dinitrobenzene in the process, and is an intrinsically safe phenylenediamine preparation process.

The invention discloses a method for quickly separating oyster peptide from oyster enzymolysis liquid. The method comprises the following steps: adding an emulsifier and lipase into enzyme-deactivated oyster enzymolysis liquid, uniformly mixing, and performing hydrolysis at the temperature of 35 to 50 DEG C for 4 to 8 h to obtain a secondary enzymolysis product of oyster; adding yeast cell wall polysaccharides and active carbon into the secondary enzymolysis product, oscillating during heat preservation at the temperature of 50 to 60 DEG C for 0.5 to 1.5 h, performing vacuum suction filtration through a filter membrane of 0.5 [mu]m, and collecting filtrate to obtain the oyster peptide. According to the method, the lipase is used for hydrolyzing fat in an enzymatic hydrolysis system to break the emulsification balance in the enzymatic hydrolysis system and drive a water phase to be separated from an oil phase. The hydrolysis conditions of the method are mild, and the process is safe and controllable; large-scale industrial production can be realized.

The invention discloses a method for removing impurity mercury from crude selenium, and belongs to the technical field of purification and impurity removal of scattered metal. The method comprises the steps: adding a vulcanizing agent into crude selenium slag which is crushed to 200 meshes or below, uniformly mixing and briquetting to obtain a mixed material, putting the mixed material into a closed furnace, and heating and vulcanizing in an inert atmosphere; carrying out vacuum distillation on the vulcanized selenium, enabling the selenium to enter a gas phase and be collected in a volatile matter form, and enriching generated mercury sulfide and valuable elements and enabling the generated mercury sulfide and the valuable elements to enter residues; and carrying out secondary distillation on the obtained selenium for further mercury removal. The method is simple in process, safe and controllable in process and convenient to operate, the mercury content in the final selenium product is smaller than 5 ppm, the direct recovery rate of selenium is larger than 96%, and the removal rate of mercury is larger than 99.8%.

The invention discloses a synthesis method of chloromethyl thiazole, and 1-isothiocyano-2-chlorine-2-propylene and chlorine are taken as the raw materials to react to obtain chloromethyl thiazole. Theprocess is simple, the reaction route is short, the cost is low, the yield is high, the molar yield is up to 99% (compared with dichloropropene), the process design is reasonable, the process is safeand controllable, no wastewater process is used, and the cost for treating wastewater is reduced.

The invention relates to a method of preparing 2,4-dichlorobenzaldehyde through continuous oxidation of 2,4-dichlorotoluene, and belongs to the technical field of organic synthetic process. The method includes the steps that a 2,4-dichlorotoluene compound is used as a raw material, one or more metal ion complexes of cobalt, molybdenum and bromine are used as catalysts, hydrogen peroxide is used as an oxidizing agent, acetic acid is used as solvent, and 2,4-dichlorotoluene is continuously oxidized in a tubular reactor to prepare 2,4-dichlorobenzaldehyde. The method is mild in condition, short in reaction time, high in raw material use ratio, safe, stable and high in production efficiency and can achieve effect control in the reaction process and continuous operation.

The invention belongs to the field of organic synthesis, and particularly discloses a system and method for synthesizing methyl ethyl oxalate based on a micro-channel reactor. The system comprises a first raw material bottle, a second raw material bottle, the micro-channel reactor and a collecting device. The micro-channel reactor comprises a first inlet micro-channel, a second inlet micro-channel, a micro-channel and a channel outlet. The first inlet micro-channel and the second inlet micro-channel are connected with the first raw material bottle and the second raw material bottle respectively. The other end of the first inlet micro-channel and the other end of the second inlet micro-channel are connected with the micro-channel. The channel outlet is connected with the collecting device. Through the efficient mixing and process strengthening of the micro-reactor, through an ester exchange method, the high methyl ethyl oxalate yield can be realized, and the selectivity is high; compared with a traditional kettle type reactor micro-reactor, continuous feeding can be realized, the production efficiency of the product is greatly improved, the process is safe and controllable, and human error accidents are reduced.

The invention discloses a metal pretreatment technological process. The metal pretreatment technological process comprises the following steps of 1, primary washing; 2, degreasing; 3, middle-stage water washing; 4, surface adjustment; 5, phosphorization; and 6, later-stage water washing. According to the metal pretreatment technological process, workpieces are treated, the treatment process is safe and controllable, the process can be conveniently and automatically operated, the workpiece processing process can be adjusted at any time, and the surface treatment process of the different workpieces can be met; and meanwhile, the mutual influence between the processes of the metal pretreatment technological process can be reduced to the minimum, and the technological process can be monitoredat any time and can be adjusted.