Method for preparing 3,3',4,4'-benzophenone tetra carboxylic acid by liquid phase air oxidation process
A technology of benzophenone tetracarboxylic acid and air oxidation, which is applied in 3 fields, can solve the problems of difficult feeding, low purity, and low yield, and achieve the effects of reducing reaction time, increasing reaction yield, and improving purity
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specific Embodiment approach 1
[0007] Specific embodiment one: the preparation of 3,3',4,4'-benzophenone tetracarboxylic acid by the liquid phase air oxidation method in this embodiment is carried out according to the following steps: 1. 1 mole of 3,3',4, 4'-Tetramethyldiphenylethane, 15-35 moles of glacial acetic acid, 0.01-0.05 moles of cobalt acetate tetrahydrate, 0.001-0.1 moles of manganese acetate tetrahydrate and 0.005-0.08 moles of tetrabromoethane are mixed, heated and dissolved to obtain Mixed solution; 2. Add the mixed solution obtained in step 1 to the reaction kettle, pressurize to 1.5-2.0MPa with an air flow rate of 0.5-1.0m3 / h, and stir at 150-180°C for 60-90min, then Pressurize to 2.0-3.0 MPa, continue to stir for 60-90 minutes, then release the pressure, discharge, cool and centrifuge to obtain 3,3',4,4'-benzophenone tetracarboxylic acid.
specific Embodiment approach 2
[0008] Specific embodiment two: The difference between this embodiment and specific embodiment one is that in step one, 1 mole of 3,3',4,4'-tetramethyldiphenylethane, 25 moles of glacial acetic acid, 0.03 mole of tetramethyldiphenylethane Cobalt acetate water, 0.05 mole manganese acetate tetrahydrate and 0.04 mole tetrabromoethane were mixed. Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0009] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the purity of 3,3',4,4'-tetramethyldiphenylethane in Step 1 is 99.0-99.8%. Other steps and parameters are the same as those in Embodiment 1.
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