A kind of method for preparing 1,3-propanediol and reaction system thereof
A technology of propylene glycol and contact reaction, which is applied in the chemical industry, can solve the problems of inability to meet the needs of industrialization, poor selectivity, and low yield, and achieve the effect of high industrial application value
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Embodiment 1
[0023] The present embodiment provides a method for preparing 1,3-propanediol, the method comprising the following steps:
[0024] (1) The catalyst is installed at a position 100 cm from the bottom of the reactor (a tubular fixed-bed reactor with an inner diameter of 2.8 cm and a length of 1.8 m), the catalyst loading is 200 ml, the catalyst particle size is 1-1.5 mm spherical, and the rest Part of it is filled with inert alumina balls; the catalyst is: 10% tungsten oxide loaded with 2% platinum, and the rest is zirconia;
[0025] (2) the above-mentioned catalyst was continuously fed with hydrogen for 1 hour at 200° C. to activate the catalyst;
[0026] (3) hydrogen and glycerol aqueous solution (60%) are mixed, and hydrogen and glycerol are mixed with different molar ratios;
[0027](4) Inject the mixed material into the reactor (200°C, 25Mpa) from the bottom of the reactor, the mixed material forms a similar homogeneous mixed fluid in the reactor, and the mixed fluid contac...
Embodiment 2
[0033] This example provides a method for preparing 1,3-propanediol, the specific steps are similar to those in Example 1, the difference is that the hydrogen-oil ratio is fixed at 0.8:1, and experiments under different temperature and pressure conditions are carried out. The test data are shown in Table 2.
[0034] Table 2 Glycerol conversion and product distribution obtained at different temperatures and pressures
[0035]
Embodiment 3
[0037] This example provides a method for preparing 1,3-propanediol. The specific steps are similar to those in Example 1, except that the hydrogen-oil ratio is fixed at 0.8:1, and several different catalysts are used. The test data are shown in the table. 3.
[0038] M1, 2% platinum supported in 10% tungsten oxide and the rest is alumina;
[0039] M2, 2% palladium is supported on 10% silica and the rest is alumina;
[0040] M3, 2% rhodium supported on 15% molybdenum oxide and the rest is silicon oxide.
[0041] Table 3 Glycerol conversion and product distribution obtained under different catalysts
[0042]
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