31 results about "3-Hexanone" patented technology

The invention relates to a catalytic dehydrating preparation method of 4-hexen-3-ketone by 4- hydroxy-3-hexanone and solves problems of low catalytic activity, high reaction temperature and low airspeed in the prior art. The 4- hydroxy-3-hexanone is adopted as a raw material, on conditions that reaction temperature ranges from 200 DEG C to 400 DEG C and the airspeed of 4- hydroxy-3-hexanone liquid quality is 0.5-15 hour -1, the raw material is contacted with a catalyst to form the 4-hexen-3-ketone. The grain diameter of the catalyst is < / = 5 micron, the catalyst is provided with zeolite ZSM-11 with mesopores and micropores, and the values of pore volumes of the mesopores and micropores of the zeolite ZSM-11 are 1.5-10. According to the technical scheme, the catalytic dehydrating preparation method solves the problems effectively and can be used in industrial production of 4-hexen-3-ketone by 4- hydroxy-3-hexanone.

The present invention relates to a kind of production method of racemic 3-hydroxyl-3-(2-phenylethyl)hexanoic acid C1-6 alkyl ester, which comprises magnesium, haloacetate C1-6 alkyl ester and 1- Phenyl-3-hexanone reaction.

The invention relates to a preparation method of 4-hexene-3-ketone by virtue of dehydration of 4-hydroxy-3-hexanone, and the method is mainly used for solving the problems in the prior art that the catalyst activity is low, the reaction temperature is high and the space velocity is low. The technical scheme adopted by the invention is as follows: according to the preparation method, 4-hydroxy-3-hexanone which is used as a raw material, is contacted with a catalyst so as to generate 4-hexene-3-ketone under the condition that the reaction temperature is 200-400 DEG C, and the space velocity relative to the liquid weight of 4-hexene-3-ketone is 0.5-15h<-1>, wherein the catalyst comprises the following components in parts by weight: a), 40-95 parts of ZSM-11 molecular sieve with the silicon aluminum mole ratio (SiO2 / Al2O3) of 20-300 and the crystal particle diameter of equal to or less than 5 microns and b), 5-6 parts of binding agent, and the ZSM-11 molecular sieve is at least subjected to once acid pickling, so that the problems in the prior art are better solved, and the method can be used in the industrial production of 4-hexene-3-ketone prepared by utilizing 4-hydroxy-3-hexanone.

The invention relates to a method of catalytic dehydration by 4-hydroxyl-3-hexanone and mainly solves the problem that catalysts are low in activity, high in reaction temperature and low in space velocity in the prior art. The 4-hydroxyl-3-hexanone is used as material to contact with catalyst at the reaction temperature of 200 DEG C-400 DEG C at the weight hourly space velocity of 0.5-15 hours-1 relative to the 4-hydroxyl-3-hexanone so as to generate 4-hexene-3-one. The catalyst is molecular sieve ZSM-11(zeolite socony mobil-11) not larger than 5 micrometers in grain diameter. The problem is solved well by the application of the technical scheme. The method is applicable to industrial production of 4-hexene-3-one by catalytic dehydration of 4-hydroxyl-3-hexanone.

The invention relates to a method for producing 4-hexene-3-one by dehydration of 4-hydroxyl-3-hexanone and mainly solves the problem that catalysts are low in activity, low in reaction temperature and low in space velocity in the prior art. The 4-hydroxyl-3-hexanone is used as material to contact with catalyst at the reaction temperature of 200 DEG C-400 DEG C at the weight hourly space velocity of 0.5-15 hours-1 relative to the 4-hydroxyl-3-hexanone so as to generate 4-hexene-3-one. The catalyst is adhesive-free ZSM-5 (zeolite socony mobil-5). The problem is solved well by the application of the technical scheme. The method is applicable to industrial production of 4-hexene-3-one by 4-hydroxyl-3-hexanone.

A synthesis method of 3,4-hexanedione comprises a step of 4-hydroxy-3-hexanonen oxidation, and in the step of 4-hydroxy-3-hexanonen oxidation, water is used as a catalyst, acetic acid is used as a cocatalyst, and ozone is used as an oxidizing agent to carry out an oxidation reaction on 4-hydroxy-3-hexanonen, and after the reaction, distillation under reduced pressure is carried out to obtain the 3,4-hexanedione. According to the synthesis method of 3,4-hexanedione in the invention, in the process of 4-hydroxy-3-hexanone oxidation, the 4-hydroxy-3-hexanone is placed in the water, the ozone is used for oxidation on the 4-hydroxy-3-hexanone, and the acetic acid is used as the cocatalyst, so that the entire oxidation reaction process is mild in conditions and simple to operate, no sewage is produced when the final product (3,4-hexanedione) is obtained, and the yield is greatly increased.

The invention relates to a method for preparing 4-hexene-3-ketone by carrying out dehydration on 4-hydroxy-3-hexanone, mainly aiming at solving the problems of low catalyst activity, high reaction temperature and slow space velocity in the prior art. The catalyst used by the method is prepared by the following steps of: mixing a silicon source, an aluminium source, template agent R1, template agent R2 and water, and adjusting the pH of the reaction mixture to be 8-14 with inorganic base; in the reaction mixture, controlling the molar ratio between Al2O3 and SiO2 to be 0.003-0.05, controlling the molar ratio of R1 to SiO2 to be 0.1-2, controlling the molar ratio of H2O to SiO2 to be 10-100 and controlling the molar ratio of R2 to SiO2 to be 0.05-2; and carrying out hydrothermal crystallization on the mixture for 1-10 days at the temperature of 100-250 DEG C to obtain the catalyst, wherein R1 comprises at least one selected from tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide or tetrabutyl ammonium hydroxide, and R2 comprises at least one selected from beta-diketone, beta-diketone salt, oxalic acid, oxalate, catechol or 8-hydroxyquinoline. The technical scheme better solves the problems, and can be used in the industrial production of the 4-hexene-3-ketone prepared by the 4-hydroxy-3-hexanone.