Method for producing mannite through adopting Raney's nickel and Raney's copper in coordination with catalytic hydrogenation
A technology of synergistic catalysis and Raney nickel, applied in Raney-type catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low selectivity, difficult post-processing, high production costs, and achieve broad application prospects , high selectivity, the effect of increasing the content
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Embodiment 1
[0024] Add 18 liters of 50% fructose aqueous solution (wherein containing 10.8kg fructose) in 20 liters of pressure reactors, add alkali (such as can adopt the sodium hydroxide solution that mass percent concentration is 3%) to adjust pH to 7.8, Add 400 grams of Raney Nickel and 40 grams of Raney Copper as a catalyst, replace the air in the autoclave with nitrogen, then continue to replace the nitrogen in the autoclave with hydrogen, and make the reaction pressure reach 9-10Mpa, then gradually increase the temperature , the reaction temperature is controlled at 90-120°C (the temperature is set at 80°C, and the final material temperature rises to 97.5°C), and the stirring is continued during the reaction process. Since the reaction temperature rises rapidly during the reaction process, the reaction is carried out under the protection of hydrogen for 1.5 After one hour, the reaction was completed, and the reaction product was obtained by cooling and standing still.
[0025] The ...
Embodiment 2
[0034] Add 18 liters of 50% refractive index fructose aqueous solution (wherein contain 10.8kg fructose) in 20 liters of pressure reactors, add alkali and adjust pH to 7.8, add 400 grams of Raney nickel and 50 grams of Raney copper as catalyst, pass into After replacing the air in the autoclave with nitrogen, continue to introduce hydrogen to replace the nitrogen in the autoclave, so that the reaction pressure reaches 9-10Mpa, then gradually heat up, and the reaction temperature is controlled at 90-120°C (the temperature is set at 80°C, and finally The temperature of the material rose to 99.2° C.), the stirring was continued during the reaction, and the reaction was completed under the protection of hydrogen for 2 hours. After the reaction was completed, the reaction product was obtained after cooling and standing still.
[0035] The product sampling test that obtains, the result is as follows:
[0036] The liquid chromatogram is as figure 2 As shown, compare it with Figur...
Embodiment 3
[0039] Add 18 liters of 50% fructose aqueous solution (wherein contain 10.8kg fructose) in 20 liters of pressure reactors, add alkali and adjust pH to 7.8, add 400 grams of Raney nickel and 60 grams of Raney copper as catalyst, pass into After replacing the air in the autoclave with nitrogen, continue to introduce hydrogen to replace the nitrogen in the autoclave, so that the reaction pressure reaches 9-10Mpa, then gradually heat up, and the reaction temperature is controlled at 90-120°C (the temperature is set at 80°C, and finally The temperature of the material rose to 98.6° C.), the stirring was continued during the reaction, and the reaction was completed under the protection of hydrogen for 2.5 hours. After the reaction was completed, the reaction product was obtained after cooling and standing still.
[0040] The product sampling test that obtains, the result is as follows:
[0041] The liquid chromatogram is as image 3 As shown, compare it with Figure 5 The standard...
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