Method for producing 1,3-propanediol
A technology of propylene glycol and glycerol, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of harsh reaction conditions, low yield, and increased cost, etc. Achieve high conversion and selectivity, high catalyst activity, and mild reaction conditions
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[0041] Example 1
[0042] First, weigh 30g SiO 2 (Qingdao Ocean Chemical Factory, 20-40 mesh), add silicotungstic acid (STA) aqueous solution (5.3g+50ml water), stir well and let stand for 12h, dry at 110℃ for 12h, and roast in muffle furnace at 350℃ 3h, get the silicotungstic acid carrier (STA / SiO 2 ); Then the copper nitrate (Cu(NO 3 ) 2 ·6H 2 O, 10.5g) and 35ml of water to make an aqueous solution, the STA / SiO 2 Add the above aqueous solution, immerse for 12h, and calcinate at 350℃ for 6h to prepare the catalyst Cu / STA / SiO 2 .
[0043] Weigh 8 g of the above catalyst and place it in a continuous-flow fixed-bed reactor. First, the catalyst was reduced at 300°C in a hydrogen-containing atmosphere for 6 hours, and the temperature was reduced to 190°C. Then, glycerin vapor diluted with hydrogen (hydrogen / glycerol molar ratio was 140) was introduced, and the glycerol mass space velocity was 0.1h -1 , The glycerin raw material contains 5wt% water, the reaction pressure is 0.36MPa, the...
Example Embodiment
[0044] Example 2
[0045] Weigh 8 g of the catalyst in Example 1 above and place it in a continuous-flow fixed-bed reactor. First, the catalyst was reduced at 300°C in a hydrogen-containing atmosphere for 6 hours, and then cooled to 210°C. Then, hydrogen-diluted glycerin vapor (hydrogen / glycerol molar ratio at 140) was introduced, and the glycerol mass space velocity was 0.08h -1 , The glycerin raw material contains 15wt% water, the reaction pressure is 0.36MPa, the glycerol conversion rate is 91.4%, the 1,3-propanediol selectivity is 23.8%, and the 1,2-propanediol selectivity is 18.9%.
Example Embodiment
[0046] Example 3
[0047] First, weigh 30gZrO 2 Powder (homemade, specific surface 56m 2 / g), add ammonium metatungstate aqueous solution (6.3g+40ml water), keep stirring at 40℃ water area for 8h, then stand for 4h, filter off the supernatant, dry at 110℃ for 12h, and heat it in a muffle furnace at 420℃ Calcined for 3h to obtain a carrier with tungstic acid (WO 3 / ZrO 2 ); Then the copper nitrate (Cu(NO 3 ) 2 ·6H 2 O, 7.6g) mixed with 15ml water to form an aqueous solution, and WO 3 / ZrO 2 Add the above aqueous solution, immerse for 12h, calcine at 420℃ for 6h to prepare the catalyst Cu / WO 3 / ZrO 2 , Forming into 20-40 mesh before use.
[0048] The reaction conditions were the same as in Example 1. The reaction results: the conversion rate of glycerol was 32.1%, the selectivity of 1,3-propanediol was 12.8%, and the selectivity of 1,2-propanediol was 32.2%.
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