Novel preparation method of o-phenylenediamine
A technology of o-phenylenediamine and o-nitroaniline, which is applied in the chemical industry, can solve the problems of complicated preparation process, poor product quality, and complicated components, and achieve the effect of convenient and simple preparation, easy operation, and simple components
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Embodiment 1
[0020] An o-phenylenediamine consisting of starting materials by weight of,
[0021] o-nitroaniline 70g
[0022] 150ml ethanol or methanol
[0023] Raney Nickel 1 g.
[0024] A preparation method of o-phenylenediamine, comprising the following processing steps,
[0025] a. Add 70g of o-nitroaniline, 150ml of methanol or ethanol, and 1g of Raney nickel into the reaction kettle;
[0026] b. Close the reactor and check the airtightness.
[0027] c. Replace the air in the autoclave with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the autoclave with 0.3MP hydrogen for 3 times;
[0028] d. Pressurize the hydrogen in the autoclave to 1.5MP, start stirring and heating, and raise the temperature to 65°C to keep the autoclave at a constant temperature for 120 minutes.
[0029] e. When the hydrogen pressure in the autoclave no longer drops, stop the reaction, cool down to 85°C and start discharging, depressurizing, and filtering to obtain the finished product.
Embodiment 2
[0031] An o-phenylenediamine consisting of starting materials by weight of,
[0032] o-Nitroaniline 80g
[0033] 170ml ethanol or methanol
[0034] Raney Nickel 2 g.
[0035] A preparation method of o-phenylenediamine, comprising the following processing steps,
[0036] a. Add 80g of o-nitroaniline, 170ml of methanol or ethanol, and 2g of Raney nickel into the autoclave;
[0037] b. Close the autoclave and check the airtightness.
[0038] c. Replace the air in the autoclave with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the autoclave with 0.3MP hydrogen for 3 times;
[0039] d. Pressurize the hydrogen in the autoclave to 1.5MP, start stirring and heating, and the temperature rises to 65°C to keep the constant temperature in the autoclave for 120 minutes.
[0040] e. When the hydrogen pressure in the autoclave no longer drops, stop the reaction, cool down to 85°C and start discharging, depressurizing, and filtering to obtain the finished product.
Embodiment 3
[0042] An o-phenylenediamine consisting of starting materials by weight of,
[0043] o-Nitroaniline 75g
[0044] 160ml ethanol or methanol
[0045] Raney nickel 1.5 g.
[0046] A preparation method of o-phenylenediamine, comprising the following processing steps,
[0047] a. Add 75g of o-nitroaniline, 160ml of methanol or ethanol, and 1.5g of Raney nickel into the autoclave;
[0048] b. Close the autoclave and check the airtightness.
[0049] c. Replace the air in the autoclave with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the autoclave with 0.3MP hydrogen for 3 times;
[0050] d. Pressurize the hydrogen in the autoclave to 1.5MP, start stirring and heating, and raise the temperature to 65°C to keep the autoclave at a constant temperature for 120 minutes.
[0051] e. When the hydrogen pressure in the autoclave no longer drops, stop the reaction, cool down to 85°C and start discharging, depressurizing, and filtering to obtain the finished product.
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