18 results about "Chloroacetone" patented technology

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The utility model discloses a residue filter in a chloroacetone production process, which belongs to the technical field of solid-liquid separation equipment and comprises a filter pressing pipe, a top cover is arranged at the top of the filter pressing pipe, an annular bulge is arranged at the bottom of an inner cavity of the filter pressing pipe, a support plate is clamped on the annular bulge, filter cloth is arranged at the top of the support plate, and a rotating rod is fixed at the top of the support plate. A sleeve is fixed to the top cover, a circular plate is fixed to the bottom of the sleeve, a baffle is rotatably arranged at the bottom of the circular plate, the baffle is slidably connected with the rotating rod, a telescopic rod is fixedly connected to an inner cavity of the baffle and sleeved with a reset spring, and the telescopic rod and the reset spring are fixedly connected with an annular plate rotatably arranged in an inner cavity of the circular plate; a second locking plate is fixed to the top of the top cover, and a locking screw arranged at the top of the top cover penetrates through the rotating rod, the first locking plate and the second locking plate in a threaded mode. According to the utility model, the filter cake can be compacted in the process of replacing the filter cloth, residual liquid in the filter cake is removed, and the filter cake is more compact.

The invention belongs to the field of organic synthesis, and discloses a novel pymetrozine intermediate and a preparation method thereof. The structure of the novel pymetrozine intermediate is as shown in a formula I. The preparation method comprises the following steps: (1) reacting propionyl hydrazine, butyrylhydrazine or isobutyrylhydrazine with phosgene or solid phosgene in a solvent to obtain corresponding ethyl oxadiazolone, n-propyl oxadiazolone or isopropyl oxadiazolone, and then removing hydrogen chloride gas to obtain a uniform reaction solution; (2) adding an inorganic base, a phase transfer catalyst and chloroacetone into the reaction liquid obtained in the step (1) to react, and then sequentially desalting, distilling and concentrating to obtain a corresponding acetonyl intermediate; and (3) adding alcohol and hydrazine hydrate into the acetone-based intermediate obtained in the step (2), and sequentially cooling, crystallizing and separating after reaction. Compared with traditional acetamido triazinone, the acetamido triazinone is easier to synthesize, lower in cost, good in thermal stability and capable of remarkably reducing the cost of pymetrozine, and in the formula I, R is ethyl, propyl or isopropyl. Formula I.

This invention discloses a method for synthesizing N-(2-oxopropyl)-bis(3-pyridylmethylene)carbonyldihydrazone. This method synthesizes N-(2-oxopropyl)-bis(3-pyridylmethylene)carbonyldihydrazone by reacting carbohydrazide, pyridine-3-carboxaldehyde, and 1-chloroacetone. This method has the advantages of high yield, simple process, low cost, good product quality, and ease of large-scale production, making it worthy of widespread use.

The invention relates to the technical field of organic synthesis, and discloses a method for preparing folic acid through continuous hedging of a tubular reactor. Sodium pyrosulfite is homogeneously dispersed with N-(4-aminobenzoyl)-L-glutamic acid and 2, 4, 5-triamino-6-hydroxypyrimidine sulfate through high pressure of a tubular reactor, raw materials are fully dispersed under the condition of a small amount of water solvent, and N-(4-aminobenzoyl)-L-glutamic acid, 2, 4, 5-triamino-6-hydroxypyrimidine sulfate and N-(4-aminobenzoyl)-L-glutamic acid are fully dispersed through high-speed flow generated by high pressure. 2, 5-triamino-6-hydroxypyrimidine sulfate and trichloroacetone are subjected to hedging to generate cyclization reaction, so that the problem of insufficient material reaction caused by folic acid deposition and wrapping is avoided; the sodium carbonate solution is sprayed to the continuous flushing liquid flow, so that raw material loss caused by hydrolysis of trichloroacetone by local alkali liquor is avoided, the purity and the yield of the crude folic acid product are remarkably improved, and the wastewater amount is reduced. The whole preparation process adopts a closed pipeline and a closed container, avoids influence of peculiar smell volatilization on operation space, and is easy to automatically control and suitable for industrial production.

The utility model relates to trichloroacetone condensation recovery technical field discloses a trichloroacetone condensation recovery device, including the backing plate, the backing plate top fixedly connected with the condenser, the backing plate top fixedly connected with the separation jar, the condenser inside is provided with the condensing pipe, the condenser top sets up the conveying assembly, the condenser side wall is provided with the progress utensil, the separation jar top fixedly connected with the exhaust frame, the exhaust frame inside is provided with adsorption subassembly, the adsorption subassembly includes the adsorption board and sliding frame no.

This invention proposes a method and apparatus for the continuous preparation of high-purity monochloroacetone using a microfluidic reactor, relating to the field of organic compound synthesis technology. The method includes the following steps: Step 1, acetone vaporization and feeding; Step 2, preparation and feeding of wet chlorine gas; Step 3, continuous chlorination reaction; and Step 4, product separation and recovery. This invention provides a method and apparatus for the continuous preparation of high-purity monochloroacetone using a microfluidic reactor, which enhances mass and heat transfer and precisely controls the reaction process. The reaction time is reduced from more than ten hours to within 60 seconds. The selectivity of monochloroacetone is ≥96% in a single pass, and the purity after purification exceeds 98%. Byproducts are easily separated. The reactor has a small liquid holdup, high intrinsic safety, maintains a slight positive pressure with low pressure drop, and operates stably and without blockages. Unreacted acetone can be recovered and reused, and the tail gas is treated as a resource. The apparatus is compact, energy-efficient, and achieves green and efficient industrial production.

The invention discloses a folic acid synthesis method. The folic acid synthesis method comprises the following steps: (1) preparing an N-p-aminobenzoyl-L-glutamic acid aqueous solution; (2) adding 1, 1, 3-trichloroacetone into the solution, and reacting to obtain turbid liquid; (3) adding a second part of water, 2, 4, 5-triamino-6-hydroxypyrimidine sulfate and sodium pyrosulfite into the turbid liquid obtained in the step (2), and reacting for 3-6 hours; performing suction filtration to obtain a folic acid crude product; the sum of the first part of water and the second part of water is total water; according to the method, a mixed solution containing high-concentration imine intermediates is obtained by optimizing a simple feeding mode, 2, 4, 5-triamino-6-hydroxypyrimidine sulfate is further added into the mixed solution, and folic acid can be obtained by reaction. The reaction path between the raw materials is fixed, a large amount of side reactions are reduced, and the raw material loss and the impurity content are reduced. The purity of the crude folic acid product is 72% or above, and the yield of the refined folic acid can reach 64% or above.

The present application relates to a kind of preparation methods of folic acid, which comprises the following steps: reaction raw material 2,4,5-triamino-6-hydroxy pyrimidine sulfate is dissolved by deoxidized weak base solution and deoxidized water, and deoxidized triamine solution is obtained;N-(4-aminobenzoyl)-L-glutamic acid, trichloroacetone, antioxidant are dissolved by deoxidized water to obtain deoxidized diamine solution, then deoxidized triamine solution is dropped into deoxidized diamine solution under vacuum to carry out reaction, and the reaction liquid is obtained by cooling, pressure filtration, washing to obtain folic acid crude product.Folic acid crude product is refined to obtain folic acid product.The present application dissolves reaction raw material by deoxidized weak base aqueous solution and deoxidized water, and the reaction process is carried out by the way of vacuum oxygen isolation, liquid-liquid drop, which can significantly reduce the consumption of antioxidant and water, and can improve the reaction effect of folic acid synthesis, therefore, the technical scheme can improve the efficiency of folic acid synthesis process, greatly reduce water consumption, improve folic acid synthesis yield and quality.

The utility model discloses a wastewater treatment device in a chloroacetone production process, which belongs to the field of sewage treatment and comprises a treatment box, and a primary treatment tank, a medicament mixing tank, a magnetic powder mixing tank, a flocculant mixing tank and a sedimentation tank are sequentially formed in the treatment box along the length direction of the treatment box. A chemical adding mechanism is arranged at the top of the chemical mixing tank and the top of the flocculant mixing tank, a magnetic powder adding mechanism capable of uniformly adding magnetic powder is arranged at the top of the magnetic powder mixing tank, the magnetic powder adding mechanism comprises a feeding hopper, and a discharging pipe extending into the magnetic powder mixing tank is arranged at the bottom of the feeding hopper; and the feeding hopper reciprocates at the top of the magnetic powder mixing pool through the driving assembly. According to the wastewater treatment device in the chloroacetone production process, the magnetic powder mixing tank is additionally arranged, so that the overall specific gravity of flocs is effectively increased, the sedimentation rate of the flocs is increased, and the treatment capacity of the clarification tank is further improved.

The application provides a preparation method of folic acid EP impurity F, comprising: A) 2,4,5,6-tetraaminopyrimidine sulfate and 1,1,3-trichloroacetone are subjected to condensation reaction in the presence of an antioxidant and a solvent to obtain a compound with the structure of formula (I); B) the compound with the structure of formula (I) is subjected to acid hydrolysis to obtain a folic acid impurity F crude product, and the folic acid impurity F crude product is subjected to chromatographic purification to obtain folic acid EP impurity F with the structure of formula (II). The application adopts a brand-new synthetic route, and impurity F can be prepared in only two steps, the obtained product has high purity, is suitable for in-depth research on the properties and synthetic mechanism of folic acid, and lays a foundation for effectively improving the folic acid quality control level. The reaction condition is mild, the starting materials used in the reaction are cheap and easy to obtain, the reaction steps are short, the post-treatment is simple, the crude product yield is high, and reaches more than 70 %.

The utility model discloses a waste gas purification treatment system for chloroacetone production, which belongs to the field of waste gas treatment and comprises a waste gas header pipe, a waste gas branch pipe, at least two adsorption towers, a steam inlet pipe, a compressed air inlet pipe and a cooling water tank. The steam inlet pipe is used for feeding hot steam into the adsorption tower, the compressed air inlet pipe is used for feeding compressed air into the adsorption tower to cool an adsorption medium, the cooling water tank is connected with a cooling water inlet of the adsorption tower through a cooling water inlet pipe, and the adsorption tower is further connected with the cooling water tank through a cooling water outlet pipe. The waste gas purification treatment system disclosed by the utility model not only can adsorb chloroacetone in waste gas, so that the waste gas reaches the standard and is discharged after being purified, but also can be switched to another adsorption tower for adsorption and purification after one adsorption tower is saturated in adsorption, so that the continuous purification treatment of the waste gas is realized; the adsorption medium in the adsorption tower can be subjected to thermal desorption regeneration and does not need to be replaced, so that the cost is saved.

The invention relates to the technical field of preparation of pesticide intermediates, and discloses a preparation method of 4-chloromethylthiazole, which comprises the following steps: step 1, solvation: adding 250ml of ethyl acetate into a four-neck flask with the volume of 500ml, cooling to 10-15 DEG C, adding 30g of ammonium dithiocarbamate at one time under the condition, stirring for 30 minutes at a uniform speed, adding 65g of 1, 3-dichloroacetone in multiple batches, stirring for 30 minutes at a constant speed, and cooling to the room temperature; the adding time is 2 hours, the reaction temperature is controlled to be 55-65 DEG C, heat preservation is conducted for 2 hours after adding is completed, cooling is conducted to 10-15 DEG C, and then filtering is conducted to obtain a material A; according to the method, the total yield reaches 95.2%, the reaction condition is mild at 70-75 DEG C, water is adopted as a solvent in the reaction steps, the safety risk is greatly reduced, meanwhile, the cost of adopted raw materials is low, and consumption of preparation resources is reduced.

This invention provides a method for preparing 6-oxa-3-azabicyclo[3.1.1]heptane hydrochloride, the method comprising the following steps: (1) reacting chloroacetone with N-tert-butoxycarbonylglycine ethyl ester, a catalyst, and a base to obtain compound 1; (2) reacting compound 1 with a base to obtain compound 2; (3) reacting compound 2 with a reducing agent to obtain compound 3; (4) reacting compound 3 with a phosphorus ligand and an azodicarbonate ester to obtain compound 4, followed by hydrochloric acid treatment to obtain the 6-oxa-3-azabicyclo[3.1.1]heptane hydrochloride. The preparation method provided by this invention requires only five steps to prepare 6-oxa-3-azabicyclo[3.1.1]heptane hydrochloride, with fewer synthesis steps, lower raw material costs, and higher overall reaction yield.

The utility model discloses a reaction kettle for producing monochloroacetone, and particularly relates to the technical field of reaction kettles, which comprises a bottom plate, a reaction tank is supported on the top of the bottom plate through a support, a sealing cover is arranged on one side of the reaction tank, a sealing ring is arranged on one side of the sealing cover, and a moving mechanism for driving the sealing cover to move is arranged on the top of the bottom plate. A gas inlet pipe is fixedly communicated with one side of the sealing cover, a feeding pipe is fixedly communicated with the top of the reaction tank, a collecting box is arranged at the top of the bottom plate, the moving mechanism comprises a limiting plate arranged outside the reaction tank, connecting plates are fixedly arranged on the two sides of the sealing cover, and one ends of the connecting plates are fixedly connected with the limiting plate. Supporting plates are fixedly arranged on the two sides of the limiting plate. Through the sealing cover, a worker can conveniently clean residues on the surface of the mixing mechanism, the next reaction efficiency is prevented from being influenced, hydrogen chloride can be recycled through the purification mechanism, and the surrounding environment is prevented from being polluted.

The utility model relates to the technical field of monochloroacetone storage, and discloses an anti-corrosion monochloroacetone storage tank which comprises a barrel body, a feeding pipe is fixedly connected to the upper surface of the barrel body, a discharging pipe is fixedly connected to the upper surface of the barrel body, a protection assembly is arranged on the side wall of the barrel body, and an anti-corrosion assembly is arranged in the barrel body. The protection assembly comprises a protection sleeve, the side wall of the can body is slidably connected to the interior of the protection sleeve, a skirt is fixedly connected to the side wall of the protection sleeve, a placement base is slidably connected to the interior of the protection sleeve, and a damper is fixedly connected to the interior of the protection sleeve. According to the storage tank, the placing seat is stressed to drive the damper to compress or stretch, the sliding block is pushed to slide, the spring is compressed or stretched when the sliding block slides, vibration energy is absorbed by means of elastic deformation, energy is released when vibration is weakened, the placing seat and the barrel body are restored to be stable, and the stability of the storage tank on the ground is enhanced; through the structure, the protection effect on the barrel body is improved.

The invention relates to a refining method of high-purity trichloroacetone, and belongs to the technical field of compound purification, the raw material used in the process is an industrial-grade trichloroacetone crude product with the purity of 50%-70%, in the first step, water is used as a solvent to dissolve, and then cooling crystallization is performed to obtain trichloroacetone solid; and 2, carrying out melt crystallization and heating dissolution on the obtained trichloroacetone solid, carrying out gradient cooling crystallization in a specific temperature range, and slowly heating and sweating the obtained crystal to obtain the trichloroacetone crystal with the purity of 98% or more and the yield of 80% or more (based on trichloroacetone). The method is easy and convenient to operate, safe, environmentally friendly, capable of effectively improving the purity of trichloroacetone, suitable for industrial production and capable of meeting the market requirement of high-purity trichloroacetone.

This utility model relates to a distillation column for preparing trichloroacetone. The sealing structure includes a sealing cap with multiple locking rods inserted into trapezoidal grooves on its edge. An adjusting disc is installed inside the sealing cap to control the synchronous movement of the locking rods. When sealing the upper end of the filter tank, the adjusting disc allows the locking rods to simultaneously engage in the trapezoidal grooves. The inclined surface at the upper end of the trapezoidal groove, in conjunction with the inclined surface, drives the locking rods downwards, causing the sealing cap to move downwards simultaneously, pressing the sealing gasket and thus sealing the upper end of the filter tank. A spring pushes the pressure ring, causing multiple pressure rods to press down from the upper end of the guide groove cavity, providing a thrust for the rotating rod. The arc-shaped groove simultaneously pushes the slider towards the outer wall of the rotating disk, thus securing the locking rods within the trapezoidal groove cavity, resulting in a good sealing effect of the sealing cap on the upper end of the filter tank.