11 results about "Formaldehyde synthesis" patented technology

The invention discloses a serine hydroxymethyltransferase mutant and an application thereof in production of L-serin.The serine hydroxymethyltransferase mutant with the specific enzyme activity remarkably improved is obtained by conducting saturated mutation on serine hydroxymethyltransferase from escherichia coli and conducting screening, and the serine hydroxymethyltransferase mutant is applied to synthesis of L-serine. The serine hydroxymethyltransferase disclosed by the invention can be used for effectively improving the efficiency of catalyzing glycine and formaldehyde to synthesize L-serine by using the serine hydroxymethyltransferase, reducing the enzyme dosage, remarkably reducing the production cost and reducing the separation difficulty of downstream products.

The present invention relates to a copper electroplating solution, a copper electroplating solution additive, and a preparation method thereof. The copper electroplating solution additive is a Schiff base compound of 5-amino-1,3,4-thiadiazole-2-thiol, and the structural formula of the Schiff base compound is: #imgabs0# The copper electroplating solution additive is synthesized from 5-amino-1,3,4-thiadiazole-2-thiol and 2-naphthaldehyde; the copper electroplating solution includes an accelerator, an inhibitor, and a leveler, wherein the accelerator is sodium polydisulfide dipropane sulfonate, the inhibitor is polyethylene glycol 6000, and the leveler is the copper electroplating solution additive. Compared with the prior art, the present invention can obtain blind hole copper plating filling without gaps and voids, and the surface of the plated layer is bright and smooth. The thickness of the copper layer obtained by electroplating is reduced from 36.2 μm when 5-amino-1,3,4-thiadiazole-2-thiol is used as the additive to 23.9 μm. The Schiff base compound can be used as an effective leveler for copper electroplating.

The utility model discloses a kind of gas flow accurate regulation and control device of preparation formaldehyde, including gas main pipe and downstream passage connected with formaldehyde synthesis reactor, flow regulation and control unit is equipped between gas main pipe and downstream passage, flow regulation and control unit and downstream passage between being equipped with the pipeline connection component for the pipe line of gas convergence and distribution is merged and distributed.The utility model is in cooperation with the collaborative architecture of integrated flow temperature sensor, pressure sensor and electric regulating valve, can synchronously collect gas flow, temperature, pressure parameter and realize dynamic adjustment, effectively shorten adjustment response time, improve flow control precision, prolong catalyst service life, significantly improve flow regulation and control precision and response speed;Main flow regulation module and spare flow regulation module are connected in parallel, and quick switching is realized by electromagnetic reversing valve;When main branch fault, system can automatically switch to spare branch, reduce production interruption, improve the reliability of device operation.

The present invention discloses a composite tackifier containing a sulfonic acid group copolymer in a fracturing fluid in the field of tackifier technology and a preparation method thereof. The composite tackifier is prepared from the following components in parts by weight: 65-75 parts of acrylamide, 6-8 parts of acrylic acid, 15-20 parts of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate, 1.2-1.8 parts of a cationic long-chain monomer, 50-60 parts of deionized water, 2-3 parts of Span-80, and 20-30 parts of white oil. The present invention synthesizes an intermediate having an imidazole and a benzene ring structure through ethyleneaniline, glyoxal, and formaldehyde, introduces an alkyl long chain with hexadecane bromide, obtains a cationic long-chain monomer, introduces a monomer with a cation, a hydrophobic long chain, and a rigid structure into the copolymer, and improves the temperature and salt resistance of the sulfonic acid group tackifier.

The invention discloses a micro-reaction device for rapidly synthesizing a urea formaldehyde chemical fertilizer, and belongs to the technical field of chemical equipment, the micro-reaction device comprises a raw material pre-mixing unit, a micro-channel reaction unit, a drying granulation unit and a cleaning system, and through a millimicron scale continuous flow technology, heat transfer and mass transfer effects are fully enhanced; the device adopts a manner of pre-mixing and then distributing heating reaction, and is combined with an automatic control system, so that the problem that the molar ratio of urea / formaldehyde and the pH value are unstable in a micro-channel amplification process is effectively solved; a vertical channel flow direction is adopted, and vacuum and pressurized water flushing are matched, so that the channel is prevented from being blocked by suspended matters; the overall effect is that the urea formaldehyde synthesis steps are continuous and automatic, the occupied area of the device is smaller, the reaction time of more than two hours in the past is shortened to be within several minutes, and the space time yield of urea formaldehyde synthesis is effectively improved.

The invention discloses a trioxymethylene synthesis and concentration method, which comprises the following steps: feeding a concentrated formaldehyde solution into a trioxymethylene reactor, and enabling a sulfuric acid catalyst to automatically flow into the trioxymethylene reactor in a head tank through a mass flowmeter and a regulating valve; the concentrated formaldehyde solution is subjected to an exothermic reaction under the action of a sulfuric acid catalyst, a trioxymethylene gas-phase crude product is obtained at the top of the trioxymethylene reactor, the trioxymethylene gas-phase crude product is sent to a trioxymethylene concentration tower to be continuously concentrated, and concentrated trioxymethylene is obtained at the top of the trioxymethylene concentration tower; the mass concentration of the concentrated formaldehyde solution is 55-75%, and the mass concentration of the sulfuric acid catalyst in the trioxymethylene reactor is 0.4-2%. According to the invention, the corrosion of the reaction system is reduced, the coking blockage of the reboiler is reduced, the energy consumption is reduced, and the reaction conversion rate is improved.

This invention relates to the field of molecular sieve materials, and particularly to a phenolic resin-based mesoporous carbon and its preparation method. By weight, the raw materials include 100 parts phenolic resin, 5-30 parts surfactant, 10-35 parts paraffin, and 5-50 parts acid. The phenolic resin is obtained by addition and condensation reactions of phenol and formaldehyde under alkaline conditions at a temperature of 75-90°C. The preparation method of the phenolic resin-based mesoporous carbon provided by this invention is simple and easy to operate. By using phenol and formaldehyde to synthesize a phenolic resin of a certain molecular weight as a precursor, the pore structure and pore size of the obtained phenolic resin-based mesoporous carbon material are controllable, achieving a uniform nanoscale microporous structure and a high specific surface area, which is beneficial for improving material performance.

The utility model belongs to the technical field of m-phenoxybenzaldehyde synthesis equipment, and particularly relates to mixing equipment for m-phenoxybenzaldehyde synthesis, which comprises a tank body, a top cover fixedly connected with the top of the tank body, a motor seat fixedly connected with the top of the top cover, a motor mounted on the outer wall of the motor seat, a driving bevel gear fixedly connected with the output end of the motor, and a driving bevel gear connected with the driving bevel gear. A driving shaft is arranged in the top cover, a scraping plate is fixedly connected to the outer wall of the driving shaft, a main transmission wheel is fixedly connected to the outer wall of the driving shaft, a driven bevel gear is fixedly connected to the top of the main transmission wheel, reciprocating rods are arranged in the top cover, reciprocating grooves are formed in the outer walls of the reciprocating rods, and driven wheels are fixedly connected to the tops of the reciprocating rods; a reciprocating disc is arranged in the tank body, and protruding blocks are fixedly connected to the inner walls of the through grooves. Under the action of the main driving wheel and the two driven wheels, impurities on the inner wall of the tank body can be scraped off while a mixed solution in the tank body is stirred, and the situation that the impurities are attached to the inner wall of the tank body and are difficult to clean is prevented.

The application discloses a kind of heteroatom doped carbon material supported metal oxide catalysts, for catalytic oxidation 5-hydroxymethylfurfural preparation 2,5-furan dimethylaldehyde.The catalyst is heteroatom doped carbon material as carrier, by post-loading metal precursor, after high-temperature calcination obtains heteroatom doped carbon material supported metal oxide catalyst.The catalyst can efficiently catalyze 5-hydroxymethylfurfural preparation 2,5-furan dimethylaldehyde, with high oxidation efficiency, high selectivity, active component is not easy to lose, easy to separate and recover and the like advantage, has broad application prospect.

This invention belongs to the field of thermosetting resin technology and relates to a bio-based flame-retardant benzoxazine resin monomer and its preparation method. The invention employs a one-pot method, with the following specific steps: salicylaldehyde and an amine compound from biomass are added to an appropriate amount of ethanol and reacted at approximately 50°C for 2-3 hours; 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) is added to the mixture, and the temperature is raised to 70°C for 8-12 hours; benzaldehyde is added to the mixture, and the reaction continues for 8-12 hours; after the reaction is complete, the product is obtained by rotary evaporation and drying. The difference between this invention and traditional benzoxazine resins lies in the following: this preparation uses bio-based benzaldehyde instead of traditional formaldehyde to synthesize benzoxazine resin, and utilizes a large amount of biomass raw materials, striving for sustainable development while also obtaining benzoxazine resin with extremely excellent flame-retardant properties; furthermore, the synthesis process of this invention is simple, economical, and environmentally friendly, suitable for large-scale production.

The invention discloses a catalyst, a preparation method and application of the catalyst in formaldehyde synthesis through methanol oxidation, and belongs to the technical field of formaldehyde synthesis. Mixing the surfactant, the cosurfactant and the oil phase at room temperature to obtain a reversed-phase microemulsion system; mixing the ferric salt aqueous solution with the reversed-phase microemulsion system to obtain a mixed solution; dropwise adding the mixed solution into a molybdenum salt aqueous solution to obtain a precursor, drying and roasting to obtain the catalyst. The obtained catalyst has an extremely high specific surface area and uniformly dispersed active sites, so that the catalytic intrinsic activity is effectively improved; a rich multi-stage pore channel structure is formed inside, and mass transfer diffusion of reactants and products is greatly optimized, so that side reactions such as deep oxidation and the like are remarkably inhibited, and the reaction selectivity is improved; the stable nanostructure constructed by the method and good crystallinity effectively inhibit sintering and loss of active components in the reaction process, and greatly enhance the stability of the catalyst.