11 results about "Pivalic acid" patented technology

This invention belongs to the field of pivalic acid production technology, specifically a catalyst recycling device and a continuous pivalic acid production process, including a base; a hydrolysis reactor is fixedly connected to the base; by opening the solenoid valve on the second water pipe, the impurity layer is fed into the mixer, and bleaching clay is added into the feed pipe to mix with the impurity layer in the mixer. The mixed slurry is sent to the treatment tank for filtration, and finally the filtered liquid is pumped back to the hydrolysis reactor for recycling hydrolysis through the first return pipe; while the dilute sulfuric acid can be discharged from the hydrolysis reactor after the impurity layer is treated by opening the solenoid valve on the third water pipe for concentration treatment, and the concentrated sulfuric acid is returned to the high-pressure reactor for recycling. This device, through its layered structure design, achieves effective separation of various components and recycling of the catalyst in the continuous production of pivalic acid, which not only improves the overall production efficiency, but also reduces production costs and waste emissions, resulting in significant economic benefits.

The invention provides an electrochromic polymer containing a thiophene embedded unit. The electrochromic polymer is prepared from the following components in parts by weight: 5 to 10 parts of 5-dibromo, 10 to 15 parts of 4-dialkoxy methyl propylene dioxythiophene, 5 to 10 parts of 4-dicyanothiophene and 3 to 5 parts of 0.006 mmol palladium acetate. The invention provides an electrochromic polymer containing a thiophene embedded unit and a preparation method of the electrochromic polymer. The electrochromic polymer is prepared from the following raw materials in parts by weight: 10-15 parts of 3, 4-dialkoxy methyl propylene dioxythiophene, 5-10 parts of 4-dicyanothiophene, 3-5 parts of 0.006 mmol of palladium acetate, 5-8 parts of 0.3 mmol of potassium carbonate, 15-30 parts of 0.03 mmol of pivalic acid, 1 part of hydrogen atom, 3 parts of halogen atom, 2 parts of hydroxyl, 2 parts of carboxyl, 1 part of ester group or linear or branched alkyl with 1-20 carbon atoms, so that the electrochromic polymer has the characteristics of low driving voltage, high optical contrast, high stability, low cost and the like. Meanwhile, two parts of precipitates are poured into a stirring device, an isopropanol solution is added into the stirring device to be stirred, filtering is conducted, and the production period is shortened.

The invention discloses a method for preparing cyenopyrafen based on ionic liquid catalysis, and belongs to the technical field of pesticide synthesis. According to the method, a functionalized acidic ionic liquid is used as a catalyst and a reaction medium at the same time, and an intermediate of a formula (I) and pivalic acid are catalyzed to directly react to synthesize cyenopyrafen. Preferably, the ionic liquid is [BMIM] [H2PO4] or [BMIM] [HSO4]. According to the method, pivaloyl chloride and triethylamine used in a traditional process are completely abandoned, and high-risk reagents, corrosive gas, viscous amine salt waste residues and amine-containing wastewater are eliminated from the source. The reaction conditions are mild, the selectivity is high, only simple extraction is needed in post-treatment, and the ionic liquid can be recycled for more than 5 times. The method has the outstanding advantages of high atom economy, simplified process flow, reduced production cost, environmental friendliness and the like, and a brand new scheme is provided for green industrial production of cyenopyrafen.

The invention provides a hydrophilic red-to-transparent electrochromic polymer and a preparation method thereof. The hydrophilic red-to-transparent electrochromic polymer is prepared from the following components in parts by weight: 1-3 parts of 5-dibromo-31, 1-3 parts of 4-ethylene disulfide thiophene, 1 part of 0.004 mmol of palladium acetate, 2 parts of 0.25 mmol of potassium carbonate, 1.2-3 parts of 0.01 mmol of pivalic acid, organic acid, weak base, a palladium catalyst and organic solvent methylbenzene. The invention provides a hydrophilic red-to-transparent electrochromic polymer and a preparation method thereof. The hydrophilic red-to-transparent electrochromic polymer is prepared from the following components in parts by weight: 1-3 parts of 5-dibromo-31, 1-3 parts of 4-ethylene disulfide thiophene, 1 part of 0.004 mmol palladium acetate, 2 parts of 0.25 mmol potassium carbonate, 1.2-3 parts of 0.01 mmol pivalic acid, organic acid, weak base, palladium catalyst, organic solvent methylbenzene, dichloromethane, chloroform concentrated solution, methanol and normal hexane. The electrochromic polymer has the characteristics of low driving voltage, high response rate, high stability and the like, and meanwhile, the organic solvents such as methylbenzene and dichloromethane have solubility, so that large-area film formation of a polymer solution is facilitated.

The application discloses a kind of synthesis method of dasatinib intermediate in the field of organic synthesis, with 2-aminothiazole-4-carboxylic acid as raw material, first and tert-pivaloyl chloride in situ generates mixed anhydride, further and 2-chloro-6-methylaniline condensation reaction occurs after, the compound 2 obtained is not separated directly hydrolyzed to obtain high-purity 2-amino-N-(2-chloro-6-methylphenyl) thiazole-5-formamide.Due to the mixed anhydride formed by tert-pivaloyl chloride has greater steric hindrance, and the further reaction of corresponding amine is conducive to the regioselectivity, and by-product tert-pivalic acid can be easily removed by post-treatment, so as to solve the disadvantages existing in the prior art, the unit operation involved in the whole preparation process is simpler, and the product purity and yield are higher, with good application prospect.

The present invention relates to a pinacolone synthesis method, and belongs to the technical field of organic synthesis, the method comprises the following steps: Step 1, isoamylene is adopted as a raw material, and is subjected to an addition reaction with methanol in the presence of an acid catalyst to obtain a methyl ether intermediate, the acid catalyst is sulfuric acid, the mass ratio of isoamylene to methanol is 1: 2-1: 3, and the methyl ether intermediate is obtained; the addition reaction temperature is controlled to be 80-100 DEG C; and Step 2, after the reaction is finished, hydrolyzing the methyl ether intermediate to obtain pinacolone. The synthesis method is green and environment-friendly, a large amount of strong acid and excessive formaldehyde are avoided, so that a large amount of tar and a large amount of waste acid are not generated, and the amount of three wastes is greatly reduced, and compared with other traditional synthesis methods in which pivalic acid or 2-chloro-2-methylbutane is used as a raw material, the synthesis method disclosed by the invention has the advantages that isoamylene is used as a raw material; according to the present invention, the raw materials are cheap and easily available, the process is simple, the amount of the three wastes is substantially reduced, and the method has high industrial production value.

The invention relates to the technical field of synthesis of pivalic acid, and discloses a high-purity pivalic acid continuous synthesis process based on ratio optimization and temperature and pressure regulation. The method comprises the following steps: firstly, acquiring synthetic raw materials, pretreating in a molar ratio range, conveying into a reaction container, and setting reaction parameters to obtain an initial reaction solution; secondly, configuring a parameter optimizer, optimizing reaction parameters to obtain optimal reaction parameters, and feeding back the optimal reaction parameters to the parameter optimizer for reaction to obtain a synthetic reaction solution; transferring the synthetic reaction liquid into a hydrolysis kettle, hydrolyzing, standing, layering to obtain an upper-layer product, a middle-layer product and a lower-layer product, and separating to obtain a pivalic acid crude product; and finally, washing and layering the crude pivalic acid product to obtain a to-be-rectified material, and putting the to-be-rectified material into a rectification device for rectification and purification to obtain high-purity pivalic acid. According to the method, the purpose of continuously synthesizing the high-purity pivalic acid is achieved by optimizing the proportion and regulating and controlling the temperature and the pressure.

According to the novel process for extracting the neopentyl glycol from the residual liquid, the catalyst is added into the residual liquid at the bottom of the tower after the neopentyl glycol rectification system, under the action of the catalyst, the hydroxyl pivalate neopentyl glycol ester in the residual liquid is hydrolyzed, and then the neopentyl glycol is recovered through rectification, so that the resource waste is reduced. Besides, the crude neopentyl glycol solution is changed into a gas phase to enter a rectification system for further purification under the pressure of-10 to-5 kPa and the temperature of 180-195 DEG C in the cracking tower, and the high-purity neopentyl glycol is extracted from the tower top and sent to a product tank, so that the aim of recovering the neopentyl glycol is fulfilled. According to the method and the system, neopentyl glycol in discharged gas can be effectively recovered, the yield of neopentyl glycol is increased, the production cost is reduced, and the production benefit is increased.

The application discloses a method for preparing methyl tert-butyl ether (MTBE) and / or tert-butyl alcohol (TBA) and belongs to the field of heterogeneous catalytic conversion. The method comprises the following steps: contacting raw material gas containing MTBE and / or TBA, CO and a solid acid catalyst, and reacting to obtain methyl pivalate and / or pivalic acid; the solid acid catalyst comprises an acidic zeolite molecular sieve. The method adopts a molecular sieve catalyst to catalyze the carbonylation of MTBE and TBA under gas-solid phase conditions to generate methyl pivalate and pivalic acid, the selectivity of the products is high, the products are easy to separate from the catalyst, the deactivated catalyst can be regenerated, the process is simple and economical, and a new path for preparing high-value-added chemicals from MTBE and TBA is opened up.

The invention belongs to the technical field of pivalic acid production, and particularly relates to a catalyst recycling device and a pivalic acid continuous production process. A hydrolysis kettle is fixedly connected to the base; an impurity-containing layer is fed into a mixer by opening an electromagnetic valve on a second water pipe, carclazyte is added into a feeding pipe to be mixed with the impurity-containing layer in the mixer, mixed slurry is fed into a treatment box to be filtered, and finally filtered liquid is pumped back into the hydrolysis kettle through a first backflow pipe by a pump to be subjected to circulating hydrolysis; dilute sulfuric acid can be discharged out of the hydrolysis kettle for concentration treatment by opening an electromagnetic valve on a No.3 water pipe after impurity-containing layer treatment, and concentrated sulfuric acid is returned to the high-pressure reaction kettle for recycling; the device realizes effective separation of each component and recycling of the catalyst in the continuous production process of the pivalic acid through layered structure design, not only improves the overall production efficiency, but also reduces the production cost, reduces the emission of wastes, and has remarkable economic benefits.

The present application relates to a preparation method of trimethylacethydrazine, which uses pivalic acid and hydrazine hydrate as raw materials, refluxes in toluene solution in the presence of Lewis acid catalyst and 4A molecular sieve, and obtains trimethylacethydrazine through dehydration reaction, and the preparation method of the present application adopts a new type of Lewis acid catalyst, which not only has low catalyst consumption, but also does not need water separation step, has simple operation method, and can obtain the target product with high yield (>95%).