Method for regenerating catalyst and method for producing carbonate ester
A manufacturing method and catalyst technology, applied in the field of carbonate manufacturing, can solve problems such as large-scale equipment, long processing time, high cost, etc., and achieve the effects of improving yield, efficient manufacturing method, and simplifying process
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Embodiment 1
[0117] First, cerium oxide (with an impurity concentration of 0.02% or less) was fired at 600° C. for 3 hours in an air atmosphere to obtain a powdery solid catalyst. The average particle size of the solid catalyst obtained in this way is about 10 μm, and the specific surface area is about 120 μm. 2 / g.
[0118] Here, the average particle diameter of the solid catalyst was measured in accordance with JIS Z 8825:2013 using a laser diffraction / scattering particle size distribution analyzer LA-920 manufactured by Horiba Seisakusho. In addition, the specific surface area of a solid catalyst is measured by the BET multipoint method using nitrogen gas using GEMINI2360 manufactured by Shimadzu Corporation according to JIS Z 8830.
[0119] Next, add the above-mentioned catalyst, dehydrating agent and substrate (1-butanol) in the autoclave (manufactured by Nitto High Pressure Co., Ltd., table-top autoclave Start200), and 2 After replacement, fill the system with CO 2 , The reactio...
Embodiment 5
[0138] In Example 2, after each carbonate formation reaction as described above, 250 mmol of the cleaning solvent was used for 7.5 mmol of the recovered catalyst, but in Example 5, only 8.3 mmol of the cleaning solvent was used for 5 mmol of the recovered catalyst, and only this A little different from Example 2. The results of Example 5 are shown in Table 5 together with the results of Example 2 and Comparative Example 2.
[0139] 【table 5】
[0140]
[0141] As described above, it was confirmed that in Examples in which the catalyst used in the carbonate formation reaction was washed with washing alcohol and reused, the yield of carbonate was maintained compared to the comparative example in which the washing step was omitted. at a higher level (see Tables 1 and 3). Furthermore, it was also confirmed that the generation of by-products can be suppressed by cleaning and regenerating the catalyst (see Table 2 and Table 4).
[0142] In addition, it was found that even a sma...
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