Catalyst for preparing neopentyl glycol
A neopentyl glycol and catalyst technology, which is applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, hydroxyl compound preparation, etc., can solve the problems of affecting the life of the catalyst, the catalyst is easily broken, pulverized, and has no running time. , to achieve the effect of improving catalyst selectivity, remarkable technical effect and reducing cost
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[0026] Preparation of θ-Al2O3 crystal form alumina:
[0027] Prepare 250mL of 2.4mol / L sodium aluminate aqueous solution and pour it into the reactor, seal it, vacuumize it and heat it to 40°C in a water bath, start stirring, slowly introduce carbon dioxide and finally keep the pressure of carbon dioxide at 1MPa, during , the following reaction occurs in solution:
[0028] 2NaAlO2+CO2+3H2O——2Al(OH)3+Na2CO3
[0029] NaAlO2+2H2O——Al(OH)3+NaOH
[0030] Na2CO3+2CO2+2Al(OH)3——2NaAl(CO3)(OH)2+H2O
[0031] 2NaOH+CO2——Na2CO3+H2O
[0032] The reaction mother liquor was continuously stirred for 48 hours, and the pH of the mother liquor was measured to be 10 when the reaction ended. Subsequently, the white precipitate generated by the reaction was taken out, washed and filtered with desalinated water for more than three times to remove residual alkaline substances, and the mixture was diluted and dried overnight at 120° C. in an oven to obtain a mixture. The mixture was characterize...
Embodiment 1
[0036] 9.1g Cu(NO 3 ) 2 ·3H 2 O, 11.3g Zn(NO 3 ) 2 ·6H 2 O, 0.7g AgNO 3 , 1.4g Ga(NO 3 ) 3 Dissolve in 500ml of water to make metal salt solution A; weigh 16.9g of sodium carbonate and dissolve in 100ml of water, add 3g of θ-Al to it 2 o 3 Powder, stir vigorously to form a precipitant-carrier suspension solution B; under mechanical stirring, control the water bath at 60°C and slowly add solution A to solution B dropwise, the reaction will form a white precipitate, and continue at 60-70°C after the addition is complete Stir and age for 1-2 hours to obtain a suspension of the corresponding mixture; wash the solid phase with deionized water until the conductivity is less than 1000 us / cm, then granulate, dry, and roast to obtain a catalyst. The catalyst contains 31wt% copper oxide, 31wt% zinc oxide, 30wt% alumina, 3wt% silver oxide, 5wt% gallium oxide, wherein alumina is θ-Al 2 o 3 crystal form.
[0037] Catalyst in embodiment 1 is 1.0h at 80 ℃, 2.0MPa, raw material we...
Embodiment 2
[0039] The synthesis method is basically the same as that of Example 2, except that the proportions of A and B solutions are different. 4.5g Cu(NO 3 ) 2 ·3H 2 O, 13.2g Zn(NO 3 ) 2 ·6H 2 O, 0.7g AgNO 3 , 1.4g Ga(NO 3 ) 3 Dissolve in 500ml of water to configure metal salt solution A; weigh 14.1g of sodium carbonate and dissolve in 100ml of water, add 4g of θ-Al to it 2 o 3 powder, stirred vigorously to form precipitant-carrier suspension solution B. The catalyst contains 15wt% copper oxide, 35wt% zinc oxide, 40wt% aluminum oxide, 3.5wt% silver oxide and 5wt% gallium oxide.
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