5results about How to "Moderate activity" patented technology

The present application relates to a kind of methyl hexahydrophthalic anhydride preparation method, comprising the following steps: with the refined methyl tetrahydrophthalic anhydride that is not isomerized as raw material, raw material and hydrogen are sent into ebullated bed hydrogenation reactor, then special catalyst is added to carry out hydrogenation;Waste hydrogen and methyl tetrahydrophthalic anhydride light component are taken out by gas phase from the top of reactor, waste catalyst is taken out from the bottom of reactor, and the hydrogenation product crude methyl hexahydrophthalic anhydride is taken out by pump control liquid level from the side of reactor;Crude methyl hexahydrophthalic anhydride is sent into the separation device with thin film evaporator and is subjected to vacuum distillation, and finished product methyl hexahydrophthalic anhydride is obtained.The catalyst used in the present application has moderate activity, high hydrogenation efficiency;Catalyst and product have no separation process, less loss, low safety risk;Post-treatment process has high heat transfer efficiency, short residence time, low colority;Product has less by-product, high yield, stable acid value and anhydride group content, and excellent performance.

The application relates to a preparation method of superfine boehmite, and belongs to the field of inorganic nonmetal material preparation. The method comprises the following steps: neutralizing reaction of an aluminum sulfate solution and a sodium aluminate solution, control of solid content and end point pH value of a reaction product in a predetermined range, and obtaining of active aluminum oxide hydrate seed slurry. The seed slurry is added into a sodium aluminate solution with a predetermined concentration in a predetermined proportion, seed division reaction is carried out at a predetermined temperature, and a decomposition slurry is obtained. The decomposition slurry is subjected to solid-liquid separation, and the filter cake is washed to obtain superfine aluminum hydroxide precursor. The precursor is mixed with water to be pulped to a predetermined solid content, and precursor slurry is obtained. The precursor slurry is subjected to hydrothermal pressure cooking at a predetermined hydrothermal temperature and time, and superfine boehmite powder is obtained.

The invention provides high-speed dispersing and stirring equipment for lithium iron phosphate battery slurry, and belongs to the field of lithium iron phosphate batteries, the high-speed dispersing and stirring equipment comprises a stirring tank, a high-speed stirring mechanism is arranged above the stirring tank, a monitoring assembly is arranged on one side of the stirring tank, and a temperature control assembly is arranged on the monitoring assembly. Through the arranged high-speed stirring mechanism, during use, a first motor drives a cross-shaped rod to rotate, then a second gear performs revolution and autorotation along a first gear at the same time, then a third gear rotates along with the second gear, the third gear is engaged with a fourth gear, and then the fourth gear rotates; at the moment, an extension rod and a stirring rod can rotate along the central axis of a fourth gear and can also rotate along with a cross rod, the stirring effect is greatly improved, through the arranged monitoring assembly, a temperature sensor can sense the temperature in the stirring tank during use, and a user can conveniently know the temperature in the stirring tank so as to take measures in time.

The present application provides a kind of dehydrogenation catalyst and its preparation method and use, the dehydrogenation catalyst includes carrier Z and copper, chromium, element X and element Y supported on the carrier Z;With the total mass of dehydrogenation catalyst as benchmark, the copper content is 1-15wt%;The chromium content is 0.1-5wt%;The element X includes any one or at least two combinations of zinc, gallium, indium, tin or bismuth;Element Y includes any one or at least two combinations of magnesium, calcium, strontium or barium.The dehydrogenation catalyst of the present application uses copper as active component, chromium, element X and element Y as auxiliary, improves the selectivity of dehydrogenation catalyst to main product of dehydrocyclization, reaction by-product is less, anti-carbon, anti-sintering;And with low chromium and low copper design to reach moderate dehydrogenation activity, avoid reaction too concentrated and cold point too low, can be used for diol efficient dehydrogenation reaction, has large-scale popularization prospect.

The invention discloses a condensate water neutralizing agent, a preparation method and application thereof and a condensation type gas water heater, and belongs to the field of water treatment. The preparation method comprises the following steps: mixing a magnesium-containing compound, a fluxing agent and water to form wet powder; granulating the wet powder to form a granular material; and drying, melting and calcining, cooling and crushing the granular material to obtain the granular condensate water neutralizing agent. The condensate water neutralizing agent obtained by the preparation method is a coarse crystal body with moderate activity, takes magnesium oxide as a main neutralizing component, is hard in texture, good in weather resistance and good in selective reactivity, is insoluble in water and only reacts with acidic substances in condensate water, and magnesium sulfate generated by the neutralization reaction is good in water solubility, so that the neutralization effect is good. The slow-release coating is not easy to coat on the surface to prevent the subsequent neutralization reaction, can achieve the purpose of long-acting slow release, is applied to a condensation type gas water heater, can meet the requirement of no replacement in the use period of more than 10 years by adding a small amount, and brings great convenience to users.