5 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 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 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 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.