Method for preparing terephthalyl alcohol by hydrogenation of terephthalic acid
A technology of terephthalic acid and terephthalic acid, applied in chemical instruments and methods, preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as difficulty in hydrogenation reaction, and achieve Low cost of raw materials, favorable for large-scale industrial production, and high selectivity
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Embodiment 1
[0016] 2.59gRuCl 3 ·3H 2 O was dissolved in 14 ml of deionized water, then 1.34 g of SnCl was added 2 2H 2 O dissolved, then add 20g carrier Al 2 o 3 Stir evenly to obtain a dark green paste, which is aged for 15 hours. Take 11.65g NaBH 4 Dissolve in 10ml of deionized water, add this solution dropwise to the above paste, let it stand for 30 minutes, filter and wash with deionized water three times, and dry at 70-90°C for 6 hours. After grinding, take particles with a particle size of 80-250 mesh as the catalyst precursor, heat and reduce with hydrogen for 2 hours, and the hydrogen flow rate is 150ml / min, and the finished catalyst for hydrogenation reaction is obtained.
Embodiment 2～8
[0018] Change the consumption of carrier and starting material in each catalyst, all the other are the same as embodiment 1.
[0019] The composition and content of the catalyst active components prepared in each embodiment are shown in Table 1.
[0020] Table 1
[0021]
[0022] 2. Hydrogenation reaction:
Embodiment 9
[0024] Adopt the catalyst that above-mentioned embodiment obtains to carry out the reaction that terephthalic acid hydrogenation prepares terephthalic acid dimethanol:
[0025] Add 15g of terephthalic acid and 150ml of water (solvent) into a 300ml autoclave at the same time, and add the required amount of catalyst in proportion. Close the reaction kettle, pump out the air in the kettle, replace it with hydrogen, stir and heat to the reaction temperature under 2.0MPa hydrogen pressure, then inject hydrogen to the reaction pressure, start the reaction timing, and maintain the required hydrogen pressure until the end of the reaction. After cooling, the catalyst was filtered off, and the product p-phenylenedimethanol in the reaction solution was analyzed by gas chromatography, and its concentration was calculated by the internal standard method.
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