Co-production method for methyl benzoic acid and phthalic acid
A technology of toluic acid and phthalic acid, applied in chemical instruments and methods, carboxylate preparation, bulk chemical production, etc., can solve the loss of intermediate product methyl benzyl alcohol, low product purity and yield, solid The large amount of waste residues and other problems can avoid side reactions, improve the utilization rate, and improve the economy.
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Embodiment 1
[0068] The catalyst that dissolves in the fresh p-xylene that adds primary oxidation reactor is N-hydroxyphthalimide, the metal phthalocyanine (R with general formula (IV) structure 1 = H, R 2 =H, M=Co), cobalt acetylketone and metalloporphyrin (R 1 = R 2 = R 3 = H, M 1 = M 2 =Mn) with a total concentration of 800 ppm. When the device is in steady state operation, the flow rate of fresh p-xylene entering the primary oxidation reactor is 73.2L / h, the flow rate of the first filtrate rich in eight-carbon oxygenate intermediates is 7.3L / h, and the total flow rate is 80.5L / h. At this moment, the average residence time of the primary oxidation reactor in terms of liquid phase substances is 1.5h, and the pressurized air with an oxygen mass percentage concentration of 21% is continuously passed into the primary oxidation reactor to maintain the system reaction temperature at 120°C. The reaction pressure is 0.5 MPa. The primary oxidation reaction solution is continuously fed in...
Embodiment 2
[0070] The catalyst dissolved in the fresh p-xylene added in the primary oxidation reactor is N-hydroxyphthalimide, cobalt naphthenate, metal phthalocyanine (R) with general formula (IV) structure 1 =OH, R 2 =H, M=Ru) and metalloporphyrins (R 1 = R 3 = H, R 2 =OH,M 1 = M 2 =Mn), the total concentration is 10000ppm. When the device is in steady state operation, the operation process is the same as in Example 1, the operating conditions of the primary oxidation reactor are shown in Table 1, and the operating conditions of the secondary oxidation reactor are shown in Table 2. Under these operating conditions, the quality, purity, yield, yield and conversion of p-xylene of each product obtained are listed in Table 3.
Embodiment 3
[0072] The catalyst dissolved in fresh p-xylene fed to the primary oxidation reactor is CeO 2 , metal phthalocyanines (R) with general formula (IV) structure 1 = H, R 2 =CH 3 CH 2 , M=Mn) and a mixture of cobalt acetate, the total concentration is 450ppm. When the device is in steady state operation, the operation process is the same as in Example 1, the operating conditions of the primary oxidation reactor are shown in Table 1, and the operating conditions of the secondary oxidation reactor are shown in Table 2. Under these operating conditions, the quality, purity, yield, yield and conversion of p-xylene of each product obtained are listed in Table 3.
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