摘要:
PROBLEM TO BE SOLVED: To provide a method for producing a polyfunctional (meth)acrylate without causing discoloration or gelation by using a recovered catalyst even after recycling so many times in the case of producing the polyfunctional (meth)acrylate by an ester interchange reaction. SOLUTION: This method for producing the polyfunctional (meth)acrylate is provided by performing the ester interchange reaction of a polyhydric alcohol and an alkyl (meth)acrylate with a tin catalyst under reflux, strong acid-treating the recovered catalyst liquid obtained by extracting the reaction liquid with a hydrocarbon solvent, and using the regenerated catalyst in another ester interchange reaction. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a method for recovering molybdenum in high yield by selectively extracting molybdenum from a spent hydrogenation catalyst. SOLUTION: The method for recovering molybdic acid comprises: a step (a) of firing the spent hydrogenation catalyst containing Mo at 450-900°C; a step (b) of dispersing the fired spent hydrogenation catalyst in NH 3 water so that the ratio ((M N )/(M M )) of the molar number (M N ) of NH 3 to that (M M ) of MoO 3 is within 1.6-3 and heating the catalyst-dispersed liquid at 80-100°C to extract Mo; a step (c) of filtering and separating the catalyst-dispersed liquid into residues and an extracted Mo-containing liquid; a step (d) of adjusting the concentration of MoO 3 in the extracted Mo-containing liquid to 3-20 wt.% and adjusting the pH of the extracted Mo-containing liquid to 0.2-1.5 by adding an acid to precipitate molybdic acid; and a step (e) of filtering and separating the precipitated material to recover molybdic acid. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a chemical for regeneration which is high in versatility and can cope with various kinds of deteriorations, and, concretely, has characteristics described below, and to provide a regeneration method using the denitration catalyst using the chemical for regeneration. SOLUTION: The chemical for regenerating used denitration catalysts is characterized in that catalyst composition powder including respective oxides of titanium (Ti), vanadium (V) and molybdenum (Mo) or tungsten (W) is dispersed into an aqueous solution including a soluble oxo-acid salt of Mo or W. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide an excellent method for regenerating a reduction catalyst to be used when (alkylamino)diphenylamines are produced by reacting aminodiphenylamines, nitrodiphenylamines or nitrosodiphenylamines with ketone in the presence of hydrogen. SOLUTION: The reduction catalyst is regenerated by bringing the reduction catalyst used in the above-mentioned reaction into contact with an inorganic acid. The regenerated reduction catalyst is used to perform the reaction, thereby producing (alkylamino)diphenylamines in high yield. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide an activation and regeneration method of a catalyst for maintaining the ability stably for a long duration even in the case of reuse by washing the catalyst-used whose ability is deteriorated. SOLUTION: The catalyst-used which is used for removal of nitrogen oxides (NO x ) or dioxins (DXN) is washed with water or an aqueous acid solution, dried, immersed in a water slurry containing catalytic components, and then fired for producing a vanadium compound so as to improve the activity. COPYRIGHT: (C)2004,JPO&NCIPI