3results 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 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.