A kind of method for preparing 1,3-propanediol by hydration and hydrogenation of acrolein
A technology for the hydration of acrolein and the preparation of hydrogen, which is applied in the preparation of carbon-based compounds, hydroxyl compounds, and organic compounds, etc., can solve the problems of difficult recycling and poor stability of homogeneous catalysts, and achieve low production cost, stability and The effect of stable composition and simple operation
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Embodiment 1-12
[0040] Using acrolein as a raw material, under the action of a homogeneous catalyst N-alkylamino acid, react with water to prepare a hydration reaction solution containing 3-hydroxypropanal:
[0041] Add deionized water, acrolein, and N-alkyl amino acids to a 1L reaction kettle, then add 0.1% mass fraction of polymerization inhibitor hydroquinone to the reaction system, continue stirring for 3h hydration reaction, take samples for analysis and calculate conversion The specific conditions and results of each embodiment are shown in Table 1, wherein the concentration of acrolein and the concentration of catalyst are their percentages in the reaction system.
[0042] Table 1 Hydration reaction
[0043]
Embodiment 13
[0045] The hydration reaction solution is added with a non-polar solvent for extraction and separation:
[0046] The hydration reaction solution of Example 1 and the extraction agent methyl tertiary butyl ether are extracted in countercurrent according to the mass ratio of 1:2, using a rotating disk extraction column with a diameter of 50 mm, the number of plates is 5, and the extraction temperature is 30 ° C. Before extraction The mass percentage content of each component (except the solvent) in the hydration reaction solution, the oil phase after extraction, and the water phase is shown in Table 2.
[0047] Table 2
[0048] Acrolein % 3-Hydroxypropionaldehyde % catalyst% other% Before extraction 4.51 15.26 6.00 1.25 oil phase 2.07 0.35 2.83 0.15 water box 0.15 15.01 0.02 1.03
[0049] The oil phase is separated by rectification, and the N-alkyl amino acids, unreacted acrolein and methyl tert-butyl ether are recovered respecti...
Embodiment 14
[0053] The hydration reaction solution is added with a non-polar solvent for extraction and separation:
[0054] The hydration reaction solution of embodiment 3 and the extraction agent benzene are extracted in countercurrent according to the mass ratio of 1:1, using a rotary disk extraction tower with a diameter of 50 mm, the number of plates is 6, the hydration reaction solution before extraction, the oil phase after extraction, the water phase The mass percentage of each component (except solvent) is shown in Table 3.
[0055] table 3
[0056] Acrolein % 3-Hydroxypropionaldehyde % catalyst% other% Before extraction 2.95 6.32 14.00 0.35 oil phase 2.41 0.32 11.89 0.06 water box 0.15 6.01 0.08 0.29
[0057] The oil phase is separated by rectification, and the N-alkyl amino acids, unreacted acrolein and methyl tert-butyl ether are recovered respectively; benzene.
[0058] Hydrogenation reaction:
[0059] A fixed bed reactor w...
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