Synthesis process of p-tert-butylbenzoic acid
A technology of p-tert-butyl benzoic acid and tert-butyl benzoic acid, which is applied in the field of synthesis technology of p-tert-butyl benzoic acid, can solve the problems of unfavorable catalyst recycling, post-treatment of equipment corrosion, poor chromaticity and the like, and achieves Elimination of corrosion and complex post-processing, low production costs, and reduced chroma effects
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[0029] Step 1, obtaining a supported composite catalyst; the preparation method of the supported catalyst comprises the following steps:
[0030] The first step is to dry the silica gel at 160°C for 2 hours to remove the adsorbed moisture and volatile substances, and set aside;
[0031] Preferably, the surface area of the silica gel is 30-550m 2 / g, more preferably the surface area of silica gel is 50-500m 2 / g, most preferably the surface area of the silica gel is 100-400m 2 / g;
[0032] The pore volume of silica gel is 0.5-3.0ml / g, more preferably the pore volume of silica gel is 0.5-2.5ml / g, most preferably the pore volume of silica gel is 0.8-2.0ml / g;
[0033] The average particle size of silica gel is 0.5-300 μm. , the average particle diameter of the silica gel is more preferably 1-200 μm, and most preferably the average particle diameter of the silica gel is 10-100 μm.
[0034] In the second step, cobalt acetate and sodium bromide are configured in a molar ra...
Embodiment 1
[0042] 1. Preparation of supported composite catalyst: first dry the silica gel at 160°C for 2 hours, remove the adsorbed moisture and volatile substances, and set aside; in the second step, mix cobalt acetate and sodium bromide in a molar ratio of 1:3, and use Ionized water is configured as a mixed solution, and the silica gel is added to form a sol under stirring conditions, and the silica gel can be impregnated with the same volume of the mixed solution of cobalt acetate and sodium bromide; the sol is left to stand at room temperature for 24 hours , then dried the sol at 160°C, activated at 290°C for 5h, and finally activated at 500°C for 6h to obtain a supported composite catalyst.
[0043] 2. Synthetic reaction of p-tert-butylbenzoic acid: add p-tert-butyltoluene, titanium zeolite and supported catalyst into the reaction kettle, feed a gas mixture containing 90% oxygen and other inert gases, at a temperature of 150°C , The reaction time was 36h, and the crude product of p...
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