32results about How to "Moderate acid strength" patented technology

The invention provides a preparation method of a catalyst for co-generating of isopropanol and diisobutyl ketone through acetone hydrogenation and an application. The preparation method is characterized in that the catalyst comprises an alumina carrier as well as Ni and Mg loaded on the gamma-Al2O3 carrier; in terms of total weight of the catalyst, the catalyst comprises 20-25% of Ni and 8-12% of Mg; the preparation method comprises the following procedures of 1) carrier preparation: taking a pseudo-boehmite powder body; adding a certain quantity of adhesives and extrusion assisting agents to the pseudo-boehmite powder body; extruding a mixture into strips or rotationally granulating the mixture; and drying and roasting the mixture so as to obtain the carrier; 2) impregnation of magnesium nitrate and nickel nitrate: impregnating the carrier in the magnesium nitrate and the nickel nitrate for 10-24 hours at room temperature; taking out the carrier after filtering the carrier; drying and roasting the carrier; and then naturally cooling the carrier; and 3) repeating of the step 2): using a magnesium nitrate and nickel nitrate impregnation liquor obtained in the step 2); impregnating a semi-finished product obtained in the step 2) in the impregnation liquor; and repeating the impregnating, drying and roasting process for at least three times according to the step 2) so as to obtain a catalyst finished product. The invention further relates to a catalytic application of the catalyst, which is prepared by the preparation method, used for co-generating the isopropanol and the diisobutyl ketone through acetone hydrogenation.

The invention relates to a method for catalyzing the synthesis of ethylene bisstearamide by quaternary ammonium titanium phosphotungstate, which is characterized in that ethylene bisstearamide is synthesized from stearic acid and ethylenediamine by using quaternary ammonium titanium phosphotungstate as a catalyst. Stearamide, the structural formula of the quaternary ammonium titanium phosphotungstic acid is: wherein, R=-C 16 h 33 , x=0.4~0.6, y=0.4~0.6. The present invention has the advantages that the molecular structure of the involved quaternary ammonium titanium phosphotungstic acid catalyst contains lipophilic groups, has good affinity to raw material stearic acid, has higher specific surface area, suitable acid strength and comparative High surface acid content has excellent catalytic performance for the reaction of synthesizing ethylene bisstearamide, the yield of the product is high, the color is light, and the purity is high.

The invention relates to a preparation method of an isobutyl ketone synthesis catalyst. The catalyst is prepared by loading bimetallic nickel and copper on alkaline-earth metallic oxide / aluminum oxide composite carrier. The preparation method of the catalyst comprises the three steps of: firstly adopting a sol-gel method to prepare the alkaline-earth metallic oxide / aluminum oxide composite carrier; then introducing active metal nickel and copper by an immersion method; and finally carrying out water hydrothermal treatment to prepare the catalyst. The preparation method has the advantages of simplicity, high activity and selectivity, integration of three catalysis functions such as condensation, dehydration and hydrogenation of acetone, and simple reaction process flow.

The invention relates to a method for synthesizing polyoxymethylene dimethyl ethers, comprising the following steps: step one, generating hemiacetal by methanol and excessive methanal or paraformaldehyde with low polymerization degree under the existence of a modified alumina catalyst, reacting the hemiacetal with methanal to generate hemiacetal with one more carbon, and successively continuing the above steps to generate poly-hemiacetal with more carbon atoms; and step two, generating the polyoxymethylene dimethyl ethers by the poly-hemiacetal mixture under the existence of methanol and an organic strong acid bonded phase solid catalyst. The invention can achieve the technical targets of improving raw material conversion rate, product selectivity, target product yield and economical efficiency by the two steps of reaction process, adjusts the space velocity by a fixed bed continuous reactor and combines with a catalyst to control the polymerization degree. The synthesis method in the invention has mild reaction conditions and easy control.