A kind of preparation method of propylene glycol
A technology of propylene glycol and co-catalyst, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of difficult suppression of side reactions, low selectivity and yield of propylene glycol, and difficult directional control.
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[0038] Such as figure 1 Shown, a kind of preparation method of propylene glycol is provided, and described preparation method comprises the following steps at least,
[0039] S1, forming a mixed system in the reactor with sugars, main catalyst and co-catalyst;
[0040] S2. The mixed system is subjected to a hydrothermal reaction in a reducing gas atmosphere to obtain the propylene glycol, wherein the co-catalyst forms magnesium hydroxide bound to the surface of the main catalyst to form a catalytically active main catalyst- Co-catalyst composite catalyst.
[0041] Below concretely illustrate the present invention from steps S1 and S2,
[0042] Specifically, in step S1, the sugar, the main catalyst and the co-catalyst are mixed in a reactor to form a mixed system, and the reactor includes one of a tank reactor or a fixed-bed reactor. For example, in the tank reactor, the dosage of the sugars includes 10-22.5 mg / ml, and the mass ratio of the main catalyst to the co-catalyst i...
Embodiment 1
[0057] The process of in-situ hydrothermal loading of magnesium hydroxide with a mass fraction of 5%-10% (calculated as MgO) includes adding 200 mg of reduced PtNPs / SiO 2 , 10mg of light magnesium oxide powder, 112.5mg such as glucose and 10ml deionized water are added into a stainless steel reaction kettle with a capacity of 50ml and sealed. Open the intake valve, fill in 1Mpa hydrogen, and then let the gas go, repeat 3 times, so that the air in the reactor is emptied. Finally, fill in 5Mpa hydrogen, close the inlet and outlet valves. The reactor was heated to 180°C for hydrothermal in-situ loading and reaction. The stirring rate is 400 rpm, and the reaction time is 4 hours (time starts when 180° C. is reached). After the reaction was completed and cooled to room temperature, the solid and liquid were centrifuged. The liquid was analyzed by liquid chromatography and gas chromatography; the solid was washed three times with deionized water before reuse or characterization. ...
Embodiment 2
[0059] 200mg reduced PtNPs / Al 2 o 3 , PtNPs / SiO 2 One of , PtNPs / K-10, PtNPs / β-molecular sieve, 10mg-100mg light magnesium oxide powder, 112.5mg such as glucose and 10-20ml deionized water are added into a stainless steel reaction kettle with a volume of 50ml for example and sealed. Open the intake valve, fill in 1Mpa hydrogen, and then let the gas go, repeat 3 times, so that the air in the reactor is emptied. Finally, fill in 5Mpa hydrogen, close the inlet and outlet valves. The reactor was heated to 180°C for hydrothermal in-situ loading and reaction. The stirring rate is 400 rpm, and the reaction time is 4 hours (time starts when 180° C. is reached). After the reaction was completed and cooled to room temperature, the solid and liquid were centrifuged. The liquid was analyzed by gas chromatography to obtain the output of propylene glycol under different conditions, and the influence of different carrier main catalyst-magnesium hydroxide co-catalyst composite materials ...
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