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

The invention relates to a preparation method of the 2,6-DMN, in particular to a preparation method of the 2,6-DMN by using a SAPO-11 molecular sieve. The preparation method mainly solves the problems that catalysts cannot be provided with high activity and 2,6-DMN selectivity simultaneously, and the catalysts are easy to inactivate. The method includes activating the SAPO-11 molecular sieve synthesized by microwave radiation and heating, mixing naphthalene and alkylation reagents with a solvent according to a molar ratio of 1:(2-4):(6-12), and performing alkylation reaction to obtain the 2,6-DMN at a temperature of 350 DEG C to 450 DEG C, at a pressure of 2 MPa to 5 MPa, at a quality airspeed of 0.5-2h-1 and at a carrier gas flow rate of 20-60 mL / min. According to the preparation method, the synthesized SAPO-11 molecular sieve can shorten the crystallization time greatly, and has high catalytic activity to the alkylation reaction of the naphthalene and high selectivity and good anti-carbon deposition competence to the 2,6-DMN.

The invention relates to a molecular sieve desulfurizer and a preparation method thereof. The method comprises heating a NaY molecular sieve and an ammonium salt solution in a water bath of 80-100 DEG C for ammonium exchanging, treating the ammonium-exchanged molecular sieve with inorganic acid or / and organic acid aqueous solutions, preparing an aqueous solution containing lanthanum and cerium with a concentration of 0.05-0.08 mol / L to exchange and modify the obtained molecular sieve ions until an exchange degree of the exchanged and modified lanthanum or cerium is 71-73 %, molding, drying and roasting the modified molecular sieve, and using an isopyknic immersion method to load transition metal elements so that a mass percent of loaded metals (on basis of oxide) is 10.0-20.0 %. Therefore, adsorptivity, selectivity and stability of the desulfurizer is well distributed, the experiment is simple to operate, raw materials are cheap and easy to purchase, a preparation process is simple, and no poisonous and harmful substances are generated.

The invention relates to a propylene glycol ether preparation method, mainly solving the shortcomings that catalyst of the prior art has low stability and imperfect products yield and isomers proportion. The invention adopts epoxy propane and higher fatty alcohol as materials, adopts niobium oxide as a main activated component, and chooses at least one of elements or oxides of Ge, Sn, Pb, P or S as auxiliary agent to form the catalyst, to prepare propylene glycol ether under the temperature of 100 to 300 DEG C, reaction pressure 1.0 to 3.0MPa, lower fatty alcohol / epoxy propane ratio 1-10: 1,liquid space velocity 1.0 to 4.0 hour<-1>. The technical proposal can well solve the problem, and has epoxy propane conversion rate higher than 98 percent, propylene glycol ether selectivity higher than 95 percent, and isomers proportions higher than 95: 5. The method of the invention can achieve comparatively high product yield and isomers proportion, and has the advantages of small energy consumption, low production cost, environmental protection and free of device corrosion, and can be used for industrial production of the propylene glycol ether.

The invention relates to a method for catalyzing and synthesizing ethylene bisstearamide by compound doped heteropoly acid salt, which is characterized in that the compound doped heteropoly acid salt is used as a catalyst to catalyze stearic acid and ethylene diamine to synthesize ethylene bis-stearamide. Stearamide, the structural formula of described compound doped heteropoly acid salt is: wherein, R=-C 16 H 33 , x=0.4~0.6, y=0.4~0.6. The advantages of the present invention lie in that the molecular structure of the compound-doped heteropolyacid salt catalyst involved contains lipophilic groups, has good affinity for the raw material stearic acid, has a relatively high specific surface area, suitable acid strength and comparatively low acidity. The high surface acid content has excellent catalytic performance for the reaction of synthesizing ethylene bis-stearamide, and the product has high yield, light color and high purity.

The present invention relates to a catalyst for preparing dimethyl ether by using methyl alcohol dehydration. Said catalyst is made up by using niobium oxide as main active component and selecting at least one kind of phosphorus or sulfur as adjuvant through a certain preparation process. Said catalyst not only has good activity, but also possesses good stability.

The invention relates to a method for catalytic synthesis of cyclohexanone ethylene ketal from titanium phosphotungstate and ammonium phosphotungstate composite salt. The titanium phosphotungstate andammonium phosphotungstate composite salt is taken as a catalyst, cyclohexanone ethylene ketal is generated from cyclohexanone and ethylene glycol through a condensation reaction, and the condensed structural formula of the titanium phosphotungstate and ammonium phosphotungstate composite salt is (NH4)xTiyH(3-x-4y)PW12O40, wherein x=0.4-0.6, and y=0.4-0.6. The titanium phosphotungstate and ammonium phosphotungstate composite salt as the catalyst has larger specific surface area, higher surface acid density and proper acid strength, so that the catalyst has excellent catalytic performance, andproduct yield is high. Besides, raw materials of the catalyst are easily available, the preparation process is simple, the catalyst and the product are easy to separate, and the catalyst is recyclable.

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 present invention relates to process of preparing dimethyl ether, and aims at providing technological scheme of preparing dimethyl ether in lowered reaction temperature, high catalyst efficiency, long service life of catalyst and other merits. The process of preparing dimethyl ether adopts methanol as main material and catalyst with niobium oxide as the main active component and P and / or S as the co-catalyst, and has reaction temperature of 100-350 DEG C and catalyst efficiency of 1-20 ml methanol / hr.g. The present invention may be applied in industrial production of dimethyl ether.

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.