Aromatic aldehyde selective hydrogenation catalyst for refining terephthalic acid
A technology of terephthalic acid and hydrogenation catalyst, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, carboxylate preparation, etc., can solve the problem of low selectivity of 4-HMBA , to achieve the effect of simplifying the process, enhancing hydrophilic properties, reducing operating costs and energy consumption
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Embodiment 1
[0029] Weigh 50 grams of 4-8 mesh, flaky coconut shell activated carbon, the specific surface is 1078 square meters per gram, and the pore volume is 0.47 milliliters per gram. After removing the dust adsorbed on the carbon surface and the loose parts on the surface, oxidize it with 0.5 mol / L nitric acid in a washing tank at a temperature of 60°C for 3 hours, and then wash it with deionized water until neutral. and dried at 120° C. for 2 hours before use. Take by weighing 0.5 gram of palladium-containing 20% chloropalladic acid solution, then add 4.05 gram of NiCl 2 ·6H 2 O, then add an appropriate amount of surfactant and sodium carbonate, and finally add deionized water to dilute to the amount of the solution just submerged gac carrier is advisable. The carrier was impregnated with the catalyst active component solution, aged for 24 hours, then reduced with hydrogen, then washed with pure water until neutral and dried to obtain the catalyst product. The physical propertie...
Embodiment 2～9
[0031] Catalysts were prepared according to the steps and operating conditions of Example 1, except that the type, concentration, temperature, time, and type, precursor, and content of the active component were changed. See Table 1 for details.
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