The invention relates to a supported solid acid catalyst, and a method for preparing ester perfumes through applying it. The novel supported heteropoly acid catalyst is obtained through loading heteropoly acid on an SAPO-34 molecular sieve molecular sieve support, or a P and B modified gamma-Al2O3 support, or a mixed support of the above two supports, the catalyst has a good catalytic effect on an esterification reaction, and allows various ester perfumes to be efficiently synthesized. The method adopting the supported solid acid as a catalyst has the advantages of avoiding of problems comprising complex post-treatment technology, equipment corrosion, and influences of byproducts to the fragrances of the ester perfumes and caused by the adoption of sulfuric acid as a catalyst, high esterification reaction activity, good product quality, and recovery and recycle of the catalyst in the invention.

Supported solid acid catalyst, and method for preparing ester perfumes through applying it

The invention discloses a method for preparing ethyl acetate by a metal-organic framework-loading phosphotungstic acid catalyst. The method comprises the steps of: dissolving phosphotungstic acid into distilled water at room temperature to prepare a solution with the concentration being 0.01-0.06mol/L; soaking a metal-organic framework into the solution for 1 hour; then baking for 2-6 hours at the temperature of 120-200 DEG C; and stirring once every other 20-30min in a baking process to prepare a catalyst, wherein the mass percent of phosphotungstic acid in the prepared catalyst is 1-15%. The prepared catalyst is applied to reactive distillation and catalysis of acetic acid and preparation of ethyl acetate by ethanol, not only the process conversion rate and the product yield are increased, but also a process flow is simplified, and equipment and operating costs are reduced.

Method for preparing ethyl acetate by metal-organic framework-loading phosphotungstic acid catalyst

The invention discloses a catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan. In the catalyst, a catalytic active component is Gamma-alumina, a promoter is phosphotungstic acid, and the mass ratio of the phosphotungstic acid to the Gamma-alumina is (0.02-0.40):1. The invention also discloses a preparation method and application of the catalyst. According to the invention, the preparation method is simple, special equipment is not needed, and the industrial production is convenient; and the prepared catalyst can be used for catalyzing the dimethyl sulfide and the hydrogen sulfide to generate the methyl mercaptan, and has the advantages of high catalytic activity and high selectivity.

Catalyst for catalyzing dimethyl sulfide and hydrogen sulfide to synthesize methyl mercaptan, and preparation method and application thereof

The invention discloses a preparation method of catalyst H6P2W15Mo3O62/TiO2 and n-pentyl acetate. Dawson H6P2W15Mo3O62 is prepared with a hydrothermal method, then TiO2 loaded Dawson type P-W-Mo-heteropolyacid catalyst H6P2W15Mo3O62/TiO2 is prepared with an impregnation method, the structure of the TiO2 loaded Dawson type P-W-Mo-heteropolyacid catalyst H6P2W15Mo3O62/TiO2 is characterized with FT-IR and XRD methods, and the catalytic activity of catalytic activity on esterification reaction is studied. The optimized conditions for preparing the catalyst are that the activation temperature is 150 DEG C, the calcination time is 4.5 h, and the load of the H6P2W15Mo3O62/TiO2 is 40%. The n-pentyl acetate synthesized by the catalyst of the H6P2W15Mo3O62/TiO2 has the advantages of excellent catalytic activity, mild reaction condition, high product yield, no environmental pollution and better recycling performance. Therefore, the H6P2W15Mo3O62/TiO2 is an excellent catalyst for synthesizing the n-pentyl acetate and has an excellent application prospect.

Preparation method of catalyst H6P2W15Mo3O62/TiO2 and n-pentyl acetate

The invention belongs to the technical field of synthesis of diallyl diethylene glycol carbonate, and particularly relates to a synthetic method of diallyl diethylene glycol carbonate. The synthetic method comprises the following steps of: (1) adding diethylene glycol, allyl alcohol, dimethyl carbonate and catalyst ion exchange resin Amberlyst-15 into a reaction still, reacting the dimethyl carbonate with the allyl alcohol to generate diallycarbonate and methanol, carrying out an ester exchange reaction on the diallycarbonate and the diethylene glycol at 50-140 degree centigrade, reflowing and thermally insulating for 2-3 hours; and (2) distilling the reaction liquid in the step (1), recovering methanol at 65-90 DEG C, recovering allyl alcohol and diallycarbonate at 95-140 DEG C, reducing to the room temperature of the catalyst-containing mixed liquor, filtering and separating the catalyst ion exchange resin Amberlyst-15 to obtain required products. The synthetic method of diallyl diethylene glycol carbonate disclosed by the invention has the advantages of simple method, heat-resisting catalyst and high purity of the obtained products, and is capable of saving the production cost.

Synthetic method of diallyl diethylene glycol carbonate

The invention discloses a method for preparing ethyl acetate by using alumina supported phosphotungstic acid as a catalyst, which is characterized by comprising the following steps of: dissolving phosphotungstic acid in distilled water to prepare solution of which the concentration is between 0.031 and 0.062 mol/L at room temperature, immersing an activated alumina support into the solution for 1 hour, calcining the immersed alumina support at the temperature of between 120 and 200 DEG C for 2 to 6 hours, and stirring the calcined alumina support once at intervals of between 20 and 30 minutes in the process of calcination, wherein the phosphotungstic acid content of the prepared catalyst is between 5 and 10 percent; and catalyzing acetic acid and ethanol to prepare ethyl acetate by adopting the prepared catalyst and the technology of reactive rectification under the reaction condition that the feed molar ratio of the acetic acid to the ethanol is 1:1, the reaction temperature is 150 DEG C, the reflux ratio is between 1 and 2, and the rate of feed is between 20 and 60 mL/hour. The method simplifies the flow process, reduces equipment cost and operating cost, and increases the process conversion rate and the yield of products.

Hui Hang

Papers

Method for preparing ethyl acetate by using alumina supported phosphotungstic acid as catalyst