9results about How to "Strong acid" patented technology

The invention discloses a composite carrier supported hydrogenation catalyst and application thereof, the composition of the catalyst is Pd-M-Nb2O5-B, and the content of the active component palladium Pd is 0.2-1.5%; the auxiliary agent M is one or two of silver and bismuth, and the molar ratio of the content of the auxiliary agent M to the active component Pd is 1: (0.5-4); nb2O5-B is a composite carrier, and the composite carrier accounts for 97.0-99.5% of the total weight of the catalyst; in the composite carrier Nb2O5-B, the content of Nb2O5 is 8 to 15 percent; b is one or more of TiO2, SiO2 and Al2O3, and the weight ratio of TiO2 to SiO2 to Al2O3 is (1-3): (5-20): 100. The catalyst has excellent water resistance, the complex carrier has stronger acidity compared with common solid acid, the product yield is higher, and the stability of the acetyl n-propanol generated by the reaction of the catalyst can be improved.

This invention provides the application of polyferric sulfate in improving plant salt stress resistance and / or improving saline-alkali land, belonging to the field of agricultural technology. The polyferric sulfate application provided by this invention can effectively improve the germination ability of plant seeds under salt stress, effectively enhance the activity of plant antioxidant systems and photosynthetic efficiency, thereby effectively improving the survival rate and growth performance of plants under salt stress. Simultaneously, polyferric sulfate can effectively reduce the EC value of saline-alkali soil, thereby effectively improving the germination rate of plant seeds in saline-alkali land and effectively improving saline-alkali land. This invention is simple to operate, low in cost, and environmentally friendly, suitable for enhancing the salt and alkali tolerance of plants, and has broad application prospects.

This invention discloses a rapid thermally conductive coated sand and its preparation process, relating to the field of coated sand technology. The raw materials include the following parts by weight: 100-105 parts raw sand, 6-8 parts modified resin prepolymer, 2-4 parts modified POE, 3.5-4.5 parts lubricant, and 3-5 parts nano-silicon nitride. The modified POE has a strong high-temperature toughening effect on the modified resin prepolymer and can also form chemical crosslinks with it, exhibiting strong compatibility with other raw materials in the coated sand. The modified resin prepolymer is obtained by heating and ring-opening polymerization of benzoxazine monomers obtained from the reaction of 5-nitrosalicylic acid, ethyl 2,4-ditrifluoromethyl-5-pyrimidinecarboxylate, paraformaldehyde, and furfurylamine. The modified resin prepolymer has a lower curing temperature and improved thermal stability, which helps to improve the high-temperature resistance of the coated sand.

The invention discloses a catalyst for preparing 2, 6-diisopropylnaphthalene through naphthalene alkylation reaction as well as a preparation method and application of the catalyst, and belongs to the field of fine chemical engineering. The method comprises the following steps: carrying out heat treatment, filtration and primary roasting on an acid dispersion liquid of hydrogen-type mordenite to obtain acid-treated mordenite; and treating the zirconium sulfate dispersion liquid of the acid-treated mordenite at 60-90 DEG C for 2-8 hours, filtering, and carrying out secondary roasting to obtain the catalyst for preparing 2, 6-diisopropylnaphthalene through the naphthalene alkylation reaction. The obtained catalyst is suitable for alkylation reaction of naphthalene, isopropanol and propylene in a fixed bed reactor, the conversion rate, the yield and the selectivity of the reaction are remarkably improved, and meanwhile generation of carbon deposition is greatly inhibited. The method is simple in preparation process and low in catalyst cost, and has a wide industrial application prospect.

This invention discloses a dry gas hydrogenation catalyst and its preparation method. The support component is alumina, and the active components are Group VIB metal sulfides and Group VIII metal sulfides. The average number of lamellar layers of the sulfides is <1.5 layers, and the proportion of single layers is 65%~80%. Based on the weight of the catalyst, Group VIB metal sulfides account for 1wt%~20wt% of the total mass of the catalyst, and Group VIII metal sulfides account for 0.5wt%~10wt% of the total mass of the catalyst. The total acid content of the catalyst is 0.1~0.25 mmol / g, of which the strong acid content at 400-500℃ accounts for 1%~6%, the medium-strength acid content at 250-400℃ accounts for 10%~20%, and the weak acid content at 150-250℃ accounts for 74%~89%. The preparation method is as follows: Boehmite dry adhesive powder is calcined at high temperature in an oxygen-containing atmosphere. The alumina dry adhesive powder is then impregnated with an active component impregnation solution, dried, and calcined at high temperature in an oxygen-containing atmosphere. Finally, it is calcined in a mixed atmosphere of H2S and H2. After molding, drying, and calcination, a dry gas hydrogenation catalyst is obtained. The catalyst of this invention exhibits good hydrogenation performance for organic sulfur and olefins, and also possesses excellent resistance to carbon deposition.

The present invention belongs to the field of catalytic technology, and is specifically related to a composite catalyst for synthesizing N-hydroxyethyl pyrrolidone from γ-butyrolactone and ethanolamine, and its preparation method and application. The composite catalyst is composed of Hβ molecular sieve, auxiliary agent and active component, wherein Hβ molecular sieve accounts for 45-75% of the catalyst mass, auxiliary agent accounts for 20-50% of the catalyst mass, and active component accounts for 2-10% of the catalyst mass. The composite catalyst prepared by the present invention is highly acidic, has a large specific surface area, increases the contact area between the reactant and the active site, greatly improves the reaction efficiency, and is more conducive to the mass transfer of the reactant and the transportation of the product. Therefore, the catalyst is used to catalyze the reaction of synthesizing N-hydroxyethyl pyrrolidone from γ-butyrolactone and ethanolamine, and extremely high catalytic activity is embodied: at relatively low temperatures (200-300°C), relatively low pressures (0.1-5MPa) and under anhydrous conditions, the conversion rate of γ-butyrolactone can be achieved to reach 88%, the selectivity of NHP reaches 92.3%, and the purity of N-hydroxyethyl pyrrolidone product separated by subsequent rectification reaches 99.8%.

The present invention proposes a motor vehicle sewage pipe cleaning agent and a preparation method and application thereof, belonging to the technical field of cleaning agents. Silane coupling agent is used to modify silicon dioxide, and then react with epichlorohydrin, and then react with alkyl polyglycoside, and then react with alkyl polyglycoside, and the obtained product is mixed with anionic surfactant, aminosulfonic acid, and citric acid to obtain a motor vehicle sewage pipe cleaning agent. The motor vehicle sewage pipe cleaning agent prepared by the present invention has the characteristics of being degradable, green, environmentally friendly, low in toxicity, and mild, has strong detergency, high descaling rate, synergistic decontamination effect between components, low corrosiveness, and has broad application prospects.

The application discloses a metal organic framework material composite catalyst and a preparation method and application thereof, and belongs to the technical field of industrial catalytic material preparation and CO2 catalytic conversion. The application takes metal organic framework material UIO-66 as a catalyst carrier and a reaction intermediate (methanol) for preparing aromatic hydrocarbon catalyst, obtains a metal oxide / metal organic framework material composite catalyst through metal oxide modification, realizes direct preparation of aromatic hydrocarbon through CO2 hydrogenation without HZSM-5 molecular sieve, effectively inhibits a side reaction, and can also obtain high selectivity of aromatic hydrocarbon under lower pressure. Compared with existing catalysts, the catalyst prepared in the application has great improvement in catalytic activity in the reaction of preparing aromatic hydrocarbon through CO2 hydrogenation, the preparation method of the catalyst is simple to operate, raw materials are cheap and easy to obtain, and the catalyst meets the demand of green industrial production.

This invention discloses a modified aluminum sol, its preparation method, and its application, belonging to the field of aluminum sol technology. The method includes the following steps: At room temperature, a 2 mol / L aluminum trichloride solution is prepared using crystalline aluminum chloride and distilled water. A 6 mol / L ammonia solution is added dropwise to the aluminum trichloride solution until the pH of the system reaches 7-8. The solution is filtered, and the filter cake is washed to obtain an intermediate product. Another 2 mol / L aluminum trichloride solution is prepared, and the intermediate product is added to it. After stirring for 10 minutes, the temperature is raised to 60°C for 50-60 minutes to obtain an aluminum sol. The aluminum sol is ultrasonically dispersed at room temperature for 15 minutes and then transferred to a reaction vessel. The reaction temperature is controlled at 60°C, and auxiliary components are added under stirring conditions. The reaction is maintained at this temperature for 3 hours to obtain the modified aluminum sol. This invention does not add highly corrosive hydrochloric acid during the preparation of the modified aluminum sol, making it safe and environmentally friendly. Furthermore, the introduction of auxiliary components improves the stability and adhesion of the aluminum sol.