A method for preparing o-fluoroaniline by hydrogenation of o-fluoronitrobenzene
A technology for o-fluoronitrobenzene and o-fluoroaniline, which is applied in the field of preparing o-fluoroaniline by hydrogenation of o-fluoronitrobenzene, can solve the problems of low demand for personnel, poor safety, large manpower and the like, and achieves large processing capacity and reaction conditions. Mild, high catalytic activity
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Embodiment 1
[0024] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Pt, Sn and K on the carrier; the mass percentage of Pt in the catalyst is 0.3%, the mass percentage of Sn is 0.3%, and the mass percentage of K is 0.3%.
[0025] The preparation method of catalyst comprises the following steps:
[0026] Step 1, dissolving platinum chloride containing 0.3g of platinum, tin chloride containing 0.3g of tin and potassium chloride containing 0.3g of potassium in dilute nitric acid with a mass concentration of 2% and mixing uniformly to obtain solution A;
[0027] Step 2, 141.6g pseudo-boehmite (containing 99.1gAl 2 o 3 ) into deionized water to obtain a suspension B with a mass concentration of 50%; the specific surface area of the pseudo-boehmite is 250m 2 / g, the mass content of alumina in pseudo-boehmite is 70%;
[0028] Step 3. Heat the solution A in step 1 and the suspension B in step 2 to 75°C and stir for 1.5 hours;
[0029] Step 4. Add the stirred so...
Embodiment 2
[0035] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Pt, Zn and Ag on the carrier; the mass percentage content of Pt in the catalyst is 0.5%, the mass percentage content of Zn is 0.15%, and the mass percentage content of Ag is 0.5%.
[0036] The preparation method of catalyst comprises the following steps:
[0037] Step 1, dissolving platinum chloride containing 0.5g of platinum, zinc nitrate containing 0.15g of zinc and silver nitrate containing 0.5g of silver in dilute nitric acid with a mass concentration of 1% and mixing uniformly to obtain solution A;
[0038] Step 2, 141.2g pseudo-boehmite (containing 98.85gAl 2 o 3 ) into deionized water to obtain a suspension B with a mass concentration of 40%; the specific surface area of the pseudo-boehmite is 250m 2 / g, the mass content of alumina in pseudo-boehmite is 70%;
[0039] Step 3. Heat the solution A in step 1 and the suspension B in step 2 to 80°C and stir for 1 hour;
[0040]Step 4....
Embodiment 3
[0046] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Pt, Sn and Co on the carrier; the mass percentage of Pt in the catalyst is 0.5%, the mass percentage of Sn is 0.2%, and the mass percentage of Co is 0.25%.
[0047] The preparation method of catalyst comprises the following steps:
[0048] Step 1, dissolving platinum nitrate containing 0.5g of platinum, tin chloride containing 0.2g of tin and cobalt chloride containing 0.25g of cobalt in dilute nitric acid with a mass concentration of 3% and mixing uniformly to obtain solution A;
[0049] Step 2, the specific surface area of 99.05g is 150m 2 / g, an average particle diameter of 5nm nano-alumina is added to deionized water to obtain a suspension B with a mass concentration of 60%;
[0050] Step 3. Heat the solution A in step 1 and the suspension B in step 2 to 70°C and stir for 2 hours;
[0051] Step 4, add solution A and suspension B stirred in step 3, and sodium carbonate solution with a ...
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