Method for recycling benzoic acid and crude terephthalic acid from PTA oxidation residues
A technology of crude terephthalic acid and benzoic acid is applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., to achieve the effects of abundant raw material sources, easy operation, and easy large-scale production
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Example Embodiment
[0022] Example one:
[0023] 10kg recycled Co 2+ And Mn 2+ 30kg of water was added to the PTA oxidation residue, stirred at 98°C for 1 hour, filtered while hot to obtain a hot filter cake, the filtrate was cooled and left for 1 hour and then filtered to obtain a white precipitate. The white precipitate is recrystallized at 95°C, filtered, dried, and crushed to become the benzoic acid product. Add 20% NaOH solution to the hot filter cake, adjust the pH to 8.0 and filter. Add 360g activated carbon and 100ml 15% H to the filtrate 2 O 2 , Stir at 50°C for 3h, filter while hot. Add 5% H in the filtrate 2 SO 4 Adjust the pH value of the solution to 3.0, leave it for 2 hours and then filter. The filter cake is washed and dried to form a crude terephthalic acid product.
Example Embodiment
[0024] Embodiment two:
[0025] 10kg recycled Co 2+ And Mn 2+ Add 25kg of water to the PTA oxidation residue, stir for 1.5h at 96°C, filter while it is hot to obtain a hot filter cake, and filter the filtrate after cooling for 2h to obtain a white precipitate. The white precipitate is recrystallized at 96°C, filtered, dried, and crushed to become the benzoic acid product. Add 15% NaOH solution to the hot filter cake, adjust the pH to 9.0 and filter. Add 300g activated carbon and 200ml10%H to the filtrate 2 O 2 , Stir at 60°C for 2h, filter while hot. Add 7% H in the filtrate 2 SO 4 Adjust the pH value of the solution to 2.5, leave it for 1.5 hours and then filter. The filter cake is washed and dried to form a crude terephthalic acid product.
Example Embodiment
[0026] Embodiment three:
[0027] 10kg recycled Co 2+ And Mn 2+ 40kg of water was added to the PTA oxidation residue, stirred at 95°C for 2h, filtered while hot to obtain a hot filter cake, the filtrate was cooled and left for 1h and filtered to obtain a white precipitate. The white precipitate is recrystallized at 98°C, filtered, dried, and crushed to become the benzoic acid product. Add 10% NaOH solution to the hot filter cake, adjust the pH to 8.0 and filter. Add 400g activated carbon and 150ml30%H to the filtrate 2 O 2 , Stir at 70 ℃ for 1h, filter while hot. Add 10% H in the filtrate 2 SO 4 Adjust the pH value of the solution to 2.0, leave it for 1 hour and then filter. The filter cake is washed and dried to form a crude terephthalic acid product.
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