Method for preparing high-purity terephthalic acid from alkali-minimization wastewater residues
A technology for terephthalic acid and alkali reduction wastewater, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of difficult removal of soluble impurities, high production costs, complex processes, etc., and achieve good economic benefits and The effects of social benefits, fast production speed and simple process
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Embodiment 1
[0034] Weigh 1.0kg of alkali reduction waste water residue (moisture content about 50%), add 3.0kg of tap water at 10-15°C, and manually stir the homogenate for 15 minutes to obtain solid content of 10% to 15%, median particle size 0.2mm suspension.
[0035] The obtained suspension was added to a centrifugal filter with a rotating speed of 1000 rpm, and the centrifugation was started for filtration. After 10 minutes, the filtration was completed, and a filter cake with a water content of 70-75% was obtained. Increase the speed of the centrifuge to 5000 rpm and maintain it for 10 minutes to further reduce the moisture content of the filter cake to 65‐70%.
[0036] Weigh 5.0kg of tap water at 10-15°C and pour it into the filter chamber of a centrifugal filter. The initial speed of the centrifuge is set at 2000 rpm, and the filter cake is washed by centrifugal filtration; after the washing water is basically exhausted, , increase the rotating speed to 5000 r / min, keep it for 20...
Embodiment 2
[0041]Weigh 1.0kg of alkali reduction wastewater residue (moisture content about 50%), add about 5.0kg of tap water at 15-20°C, and use a stirring paddle to stir the slurry at a stirring speed of 1500 rpm for 20 minutes to obtain the solid content 5% to 10% suspension with a median particle size of 0.2mm.
[0042] The obtained suspension was added to a centrifugal filter with a rotating speed of 1000 rpm, and the centrifugation was started for filtration. After 10 minutes, the filtration was completed, and a filter cake with a water content of 70-75% was obtained. Increase the speed of the centrifuge to 5000 rpm and maintain it for 10 minutes to further reduce the moisture content of the filter cake to 65‐70%.
[0043] Weigh 5.0kg of tap water at 15-20°C and pour it into the filter cavity of a centrifugal filter. The initial speed of the centrifuge is set at 2000 rpm, and the filter cake is washed by centrifugal filtration; after the washing water is basically exhausted, , i...
Embodiment 3
[0047] Weigh 1.0kg of alkali-reduced wastewater residue (moisture content about 50%), add about 10.0kg of tap water at 20-25°C, and use a stirring paddle to stir the slurry at a stirring speed of 1500 rpm for 25 minutes to obtain the solid content 2.5% to 5% suspension with a median particle size of 0.2 mm.
[0048] The obtained suspension was added to a centrifugal filter with a rotating speed of 1000 rpm, and the centrifugation was started for filtration. After 10 minutes, the filtration was completed, and a filter cake with a water content of 70-75% was obtained. Increase the speed of the centrifuge to 5000 rpm and maintain it for 10 minutes to further reduce the moisture content of the filter cake to 65‐70%.
[0049] Weigh 5.0kg of tap water at 20-25°C and pour it into the filter chamber of a centrifugal filter. The initial speed of the centrifuge is set at 2000 rpm, and the filter cake is washed by centrifugal filtration; after the washing water is basically exhausted, ...
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