Catalyst and method for preparing glycine methyl ester and glycine through catalytic amination of methyl glycolate
A catalyst, glycine technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve problems such as cost increase, achieve low cost, improve activity and stability, Inexpensive effect
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Embodiment 1
[0027] This example is used to illustrate the catalyst of the present invention, its preparation method and the method for preparing glycine methyl ester by catalytic amination of methyl glycolate.
[0028] (1) Preparation of a composite silica carrier containing Beta zeolite: Add Ludox silica sol and Beta zeolite into the reaction tank. The specific reaction conditions include: the initial reaction temperature is 25°C, and the initial concentration of silica sol is 20g SiO 2 ·L -1 , after stirring and aging at 25°C for 2h, the resulting solution was evaporated to dryness, dried at 120°C for 14h, kneaded and then calcined at 600°C for 5h to prepare a composite silica carrier with a Beta zeolite content of 10wt% based on the weight of the carrier .
[0029] (2) Co(NO 3 ) 2 , Ni(NO 3 ) 2 , Cu(NO 3 ) 2 , Fe(NO 3 ) 3 and Zn(NO 3 ) 2 Prepare a solution and impregnate the carrier obtained in step (1), dry at 120°C for 2h, and roast at 380°C for 4h to prepare a catalyst wi...
Embodiment 2
[0032] This example is used to illustrate the catalyst of the present invention, its preparation method and the method for preparing glycine by direct catalytic amination of methyl glycolate.
[0033] (1) Preparation of composite alumina carrier containing ZSM-5 zeolite: Add ZSM-5 zeolite and 200ml water into the reaction kettle, use nitric acid to adjust the pH value of the reaction system to 5.0, and then add nitric acid and sodium metaaluminate in parallel In the reaction kettle, the reaction conditions include: the temperature is 40°C, the mass concentration of sodium metaaluminate is 100g / L, the gelation time is 1.2h, the end point pH value is 7.0, keep the temperature unchanged for 2h, and then wash to remove impurities , dried at 120° C. for 20 hours, kneaded and then calcined at 550° C. for 4 hours to prepare a composite alumina carrier with a ZSM-5 zeolite content of 5 wt % based on the weight of the carrier.
[0034] (2) Co(NO 3 ) 2 , Ni(NO 3 ) 2 , Cu(NO 3 ) 2 ...
Embodiment 3
[0037] This example is used to illustrate the catalyst of the present invention, its preparation method and the method for preparing glycine methyl ester by catalytic amination of methyl glycolate.
[0038] (1) Preparation of a composite silica carrier containing mordenite and carbon black: Add Ludox silica sol, mordenite and carbon black to the reaction tank. The specific reaction conditions include: the initial reaction temperature is 20°C, and the initial concentration of silica sol is 30g SiO 2 ·L -1 , after stirring and aging at 25°C for 3h, the resulting solution was evaporated to dryness, dried at 120°C for 14h, kneaded and then calcined at 450°C for 4h to prepare a mordenite zeolite content of 7.5wt% and carbon black based on the weight of the carrier. Composite silica support with a content of 2.5 wt%.
[0039] (2) Co(NO 3 ) 2 , Ni(NO 3 ) 2 , Cu(NO 3 ) 2 , Fe(NO 3 ) 2 and Zn(NO 3 ) 2 Prepare a solution and impregnate the carrier obtained in step (1), dry at...
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