6 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 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 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 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.