14 results about "Nitroguanidine" patented technology

The invention discloses a fermentation process for shortening a fermentation period and efficiently synthesizing Ectoine. The fermentation process comprises the following steps: screening and activating high-yield strains, preparing a fermentation culture medium, performing fermentation culture, performing sectional dissolved oxygen regulation and control, performing double-stage pH dynamic regulation and control, performing carbon-nitrogen ratio dynamic regulation based on metabolic flow analysis, performing osmotic pressure gradient induction in the later stage of fermentation, and extracting and purifying a product. According to the fermentation process for shortening the fermentation period and efficiently synthesizing the Ectoin, the expression quantity of key enzymes for synthesizing the Ectoin is increased by 80% or above compared with that of an original strain through the Halomonassp.ECT-09 strain bred through ultraviolet-nitrosoguanidine compound mutation, the basic yield reaches 35 g / L, a foundation is laid for high yield, and the method is suitable for industrial production. A glucose-trehalose mixed carbon source and a yeast extract-ammonium nitrate mixed nitrogen source are adopted, and an L-aspartic acid-L-asparagine mixed precursor is added, so that the metabolic pathway is shortened, and the loss of an intermediate product is reduced.

A grinding device for nitroguanidine production belongs to the field of devices for nitroguanidine production and comprises a bottom plate assembly, a containing unit, a grinding unit, a protection unit and a filtering unit, the containing unit is clamped at the upper end of the bottom plate assembly, the bottom plate assembly is fixedly connected with the grinding unit, the grinding unit is used in cooperation with the containing unit, and the filtering unit is used in cooperation with the grinding unit. The protection unit is fixedly connected with the bottom plate assembly, and the bottom plate assembly is fixedly connected with the filtering unit. The problems that in the background technology, an existing grinding device is simple in structure and poor in protection performance, nitroguanidine is not stable in chemical property, the danger of explosion is generated due to the fact that the nitroguanidine is prone to being affected by the temperature generated by friction during grinding, and dust generated during grinding can harm operators can be solved.

The invention discloses a method for realizing continuous synthesis and crystallization control of nitroguanidine by using a continuous flow multi-stage stirring reactor. The method comprises the following steps: weighing perfluorinated sulfonic acid resin, placing the perfluorinated sulfonic acid resin in a catalyst cage, and mounting the catalyst cage in the continuous flow multi-stage stirring reactor; setting the temperature of a reaction section to be 20-50 DEG C and the temperature of a crystallization section to be-20-10 DEG C; introducing concentrated sulfuric acid in advance to fill an internal channel of the continuous flow multi-stage stirring reactor; guanidine nitrate and concentrated sulfuric acid are premixed and then introduced into the reactor, and the retention time of a reaction section is 0.5-10 min; water is introduced into the crystallization section, and the standing time in the crystallization section is 1-30 min; and collecting a reaction product solution, washing with cold water, and filtering. The continuous synthesis of the nitroguanidine prepared by the sulfuric acid method is realized, the mass and heat transfer efficiency is greatly improved, the reaction time is greatly shortened, the product yield is greatly improved, and the maximum yield of the nitroguanidine is 98%.

The invention discloses a methyl nitroguanidine wastewater ultralow-temperature MVR coupling reverse Carnot cycle zero-discharge treatment method, and relates to the technical field of methyl nitroguanidine wastewater treatment.The methyl nitroguanidine wastewater ultralow-temperature MVR coupling reverse Carnot cycle zero-discharge treatment method comprises the following steps that firstly, after methyl nitroguanidine wastewater enters a regulating reservoir to be homogenized and homogenized, floating oil is removed through an oil removal device, suspended matter is removed through a multi-medium filter, and a mixed solution is obtained; volatile organic compounds are removed by the air stripping device, and the organic compounds are degraded by the ozone catalytic oxidation-biological aerated filter; according to the ultralow-temperature MVR coupled reverse Carnot cycle zero-emission treatment method for the methyl nitroguanidine wastewater, organic matters and salts in the methyl nitroguanidine wastewater are thoroughly separated through a coupling process of ultralow-temperature MVR evaporation concentration and reverse Carnot cycle DTB crystallization, the targets of complete resource utilization and zero emission of the wastewater are achieved, no secondary pollution is generated in the whole treatment process, and the method is suitable for industrial production. The treatment effect is stable and reliable.

The invention discloses a method for realizing one-step continuous synthesis and crystallization control of nitroguanidine by acoustic resonance enhancement, which comprises the following steps of: 1, purging the interior of a whole reactor by using inert gas, and introducing concentrated nitric acid and the inert gas in advance; 2, starting an acoustic resonance reaction platform, and adjusting the resonance frequency and the acceleration of the acoustic resonance reaction platform; 3, guanidine nitrate and nitric acid are premixed and then introduced into the continuous reactor, and meanwhile inert gas is controlled to be introduced into the continuous reactor; and 4, collecting a reaction product, washing with cold water, and filtering. According to the method, the mass transfer and heat transfer efficiency is greatly improved, the reaction time is greatly shortened, the product yield is greatly improved, and the highest yield of nitroguanidine is 98%; by adjusting the resonant frequency and the acceleration, the granularity of the product can be accurately controlled, and the granularity requirement of the industry is met.

The invention relates to the technical field of preparation of fine chemical intermediates, in particular to a method for preparing nitroguanidine by a continuous static tubular reaction process, which comprises the following steps: pumping a sulfuric acid solution in a batching tank into a static tubular reactor; the guanidine nitrate in the feeding hopper is pushed to a static tubular reactor through a solid feeder installed at an output port of the feeding hopper, and the mass ratio of the sulfuric acid solution to the guanidine nitrate is controlled to be 1.0: (1.0-5.0); uniformly mixing a sulfuric acid solution and guanidine nitrate through a high-shear pump, and conveying the mixture to a reaction section of the static tubular reactor for reaction; conveying a reaction product into a hydrolysis kettle, and sequentially carrying out hydrolysis and preliminary cooling treatment; and conveying the initial product into a crystallization mechanism for cooling crystallization, and carrying out filtering centrifugal treatment and drying treatment to obtain a target nitroguanidine product. According to the method, high-efficiency, safe and continuous nitroguanidine production is realized, and the purity and quality of the target product nitroguanidine are also effectively improved.

The invention discloses a nitroguanidine spherical crystal and a preparation method thereof.The preparation method comprises the following steps that under the stirring condition, an additive is added into a nitroguanidine saturated water solution, the temperature is kept at 55-70 DEG C for 30-60 min, then cooling crystallization is conducted, and the nitroguanidine spherical crystal is obtained; the additive is a polyacrylic acid polymer and / or sodium carboxymethyl cellulose. According to the preparation method, the additive and cooling crystallization are matched to obtain the nitroguanidine spherical crystal, and the spherical crystal product is good in degree of sphericity, uniform in particle and good in flowability; the crystallization process only relates to a single water solvent, mother liquor can be recycled, the method is green and environment-friendly, the process is simple, and industrial large-scale production and application are facilitated.

The utility model discloses a continuous shearing device for superfine nitroguanidine, and relates to the technical field of chemical equipment, the device comprises a stirring batching tank, a first material conveying pipeline, a material control valve, a material flow detector, a material discharge pipeline, a shearing mechanism and a control device; the shearing mechanism comprises a first-stage spiral stirring shearing machine, a second-stage spiral stirring shearing machine, a third-stage spiral stirring shearing machine, a first three-way valve, a second three-way valve and a third three-way valve; each of the first-stage spiral stirring shearing machine, the second-stage spiral stirring shearing machine and the third-stage spiral stirring shearing machine comprises a spiral stirring blade, a stirring shaft, a driving mechanism and a stirring tank; a second outlet end of the first three-way valve is connected with an input end of the material discharge pipeline; a second outlet end of the second three-way valve is connected with an input end of the material discharge pipeline; the control device comprises a frequency converter and a control mechanism. By means of the arrangement, the shearing efficiency is high, the reaction process is easy to control, continuous feeding and discharging can be achieved, and meanwhile the product particle size can be selected in multiple modes.

The application discloses a kind of nitro guanidine continuity preparation device and process, the bottom end inner wall of the pretreatment mechanism is connected with waste outlet, and first solenoid valve is arranged on waste outlet, and the bottom end of pretreatment mechanism is provided with mixing mechanism, and the bottom end outer wall of mixing mechanism is fixed with underframe;The mixing mechanism includes mixing bin, and the inner wall of one side of mixing bin is closely connected with second conveying pipe, and the top inner wall of second conveying pipe is connected with powder storage bin by first conveying pipe, and one end of second conveying pipe is closely connected with air blower, and the inner wall of mixing bin is provided with baffle above second conveying pipe, and frequency adjusting mechanism is simultaneously provided on second conveying pipe and first conveying pipe;The top inner wall center position of the mixing bin is provided with movable connecting piece, and the nitro guanidine continuity preparation device and process disclosed in the application can better realize the continuity preparation of nitro guanidine and effectively improve the preparation efficiency.

The present application relates to a kind of low-temperature preparation methods of phosphating solution for improving the corrosion resistance of steel surface phosphating film, specifically is the deionized water is cooled to 10-15 DEG C by water bath;Phosphoric acid, phosphate, nitrate, nitroguanidine and organic acid are sequentially dissolved in deionized water in order, then cooled to 1-5 DEG C, and maintain more than 20 min;Phosphating solution is heated to the operating temperature required by phosphating process.The present application method does not need to change the specific composition of phosphating solution, also does not need to adjust the temperature, time and other process conditions of phosphating process, only needs to ensure specific low-temperature conditions and the adding order of chemical reagent when preparing phosphating solution, can form thicker corrosion-resistant film layer on the surface of steel parts, and while greatly improving the stability of plating solution, also can maintain higher plating speed, thereby effectively control production cost and production efficiency.

This invention discloses an iron-carbon micro-electrolysis filler for the degradation of nitroguanidine wastewater and its preparation method. It is prepared using red mud as the iron source, waste oil as the carbon source, and potassium hydroxide as the pore-forming agent. This invention utilizes strong acid to etch the red mud, extracting iron from it. Adjusting the pH of the leachate yields high-purity Fe(OH)3, which is then decomposed into Fe2O3 at high temperature and subsequently carbothermally reduced to zero-valent iron. This avoids the silicon and aluminum in the red mud coating the zero-valent iron, thus preventing it from affecting the micro-electrolysis effect. The zero-valent iron has good contact with the carbon material, effectively forming a galvanic cell. Using liquid waste oil and organic flocculants as the carbon material and reducing agent sources increases the contact between the carbon material and iron oxide, improving the reduction efficiency. KOH etching of the carbon material forms channels, preparing a porous composite material that enhances the adsorption and enrichment of pollutants. Compared with existing red mud-based iron-carbon micro-electrolysis materials, this method is simpler, lower in cost, and easier to scale up.

The invention relates to the technical field of chemical engineering, in particular to a method for synthesizing aminonitroguanidine, which comprises the following steps: S1, adding recycled hydroxylamine into an operation cylinder, adding nitroguanidine, uniformly stirring, adding hydroxylamine, and controlling the adding time of hydroxylamine to be 5-6 hours; s2, heating the stirred raw materials to 60 DEG C for reaction, keeping the temperature and refluxing for 6 hours, cooling to 20 DEG C after the reaction is completed, and then filtering and washing to obtain an amino nitroguanidine crude product; and S3, adding the crude aminonitroguanidine product into the pulping tank, adding clear water, uniformly stirring, and centrifuging in a centrifugal machine to obtain a finished aminonitroguanidine product. According to the preparation method, the nitroguanidine falls into each position of the operation cylinder, so that the subsequent stirring speed is increased, the problem that the nitroguanidine can only be stacked at one position when being put in the past is solved, meanwhile, the content of the aminonitroguanidine is increased to 99%, the yield of the aminonitroguanidine is increased to 90%, and the preparation method is safe, environmentally friendly and suitable for industrial production.

The invention discloses a selective desulfurizer and application thereof, the total mass of the selective desulfurizer is 100%, and the selective desulfurizer comprises: 5-35 wt% of s-triazine and derivatives thereof; 0.1 to 5 weight percent of nitroguanidine and a water-soluble organic alkali compound; and the balance of water. Wherein the content of nitroguanidine is greater than 0, and the content of the water-soluble organic alkali compound is greater than 0. The desulfurizer can efficiently reduce the content of low-concentration sulfur in fuel gas, has high selectivity under the condition that the desulfurizer contains acid gas carbon dioxide, and reduces the content of hydrogen sulfide in the desulfurized gas to 2 mg / Nm < 3 > or below.

This invention discloses a highly insulating and low-hygroscopic thermal aerosol fire extinguishing agent and its preparation method, relating to the field of lithium-ion battery fire extinguishing agent technology. The key technical points include a redox system based on strontium nitrate and nitroguanidine, combined with a specific proportion of ammonium polyphosphate-melamine cyanurate-nano silica composite flame retardant, and the introduction of an additive. This additive is prepared by loading a mixture of methyltrimethoxysilane and octyltriethoxysilane onto a tin-doped mesoporous silica carrier. The effect is that when the fire extinguishing agent is released, the silane in the additive rapidly forms a highly insulating and hydrophobic siloxane network covering layer under the catalysis of tin ions. Simultaneously, the synergistic effect of the formulation and carrier structure endows the product with low hygroscopicity, ensuring stable performance in humid environments.