De-coloring method of benzoic acid heavy by-product benzyl benzoate
A technology of benzyl benzoate and benzoic acid, which is applied in the field of decolorization of benzyl benzoate, a heavy by-product of benzoic acid, can solve the problems of high GC content of benzyl benzoate, low single-pass yield, solvent toxicity recovery, etc., and achieve production The process is simple, the product yield is high, and the production cost is low.
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Embodiment 1
[0022] The leftovers of benzoic acid produced by liquid-phase air oxidation of toluene in a chemical plant of A are used as raw materials:
[0023] 1) The leftovers of benzoic acid are produced by toluene liquid-phase air oxidation, and 100 g of benzyl benzoate crude product is obtained through vacuum distillation. After testing, the GC content of this benzyl benzoate is 99.38%, and the color number is 180 Hazen, which is added to the reaction vessel;
[0024] 2) Add 50 g of 10% acetic acid aqueous solution and 0.75 g of aluminum powder to the crude product of benzyl benzoate, then put the reaction vessel into a water bath, stir and raise the temperature to 70° C., and keep it warm for 6 hours;
[0025] 3) After the reaction is finished, it is cooled to room temperature, and the unreacted active metal is removed by filtration;
[0026] 4) The filtrate is stratified again to obtain the upper oil layer;
[0027] 5) Distill and dehydrate the oil layer under reduced pressure at 9...
Embodiment 2
[0029] The leftovers of benzoic acid produced by liquid-phase air oxidation of toluene in a certain B chemical plant are used as raw materials:
[0030] 1) The leftovers of benzoic acid are produced by toluene liquid-phase air oxidation, and 100 g of benzyl benzoate crude product is obtained through vacuum distillation. After testing, the GC content of this benzyl benzoate is 99.42%, and the color number is 200 Hazen, which is added to the reaction vessel;
[0031] 2) Add 50 g of 10% hydrochloric acid aqueous solution and 1 g of iron powder to the crude product of benzyl benzoate, then put the reaction vessel into a water bath, stir and raise the temperature to 100° C., and keep it warm for 5 hours;
[0032] 3) After the reaction is finished, it is cooled to room temperature, and the unreacted active metal is removed by filtration;
[0033] 4) The filtrate is stratified again to obtain the upper oil layer;
[0034] 5) Distill and dehydrate the oil layer under reduced pressure...
Embodiment 3
[0036] The leftovers of benzoic acid produced by liquid-phase air oxidation of toluene in a certain C chemical plant are used as raw materials:
[0037] 1) The leftovers of benzoic acid are produced by liquid-phase air oxidation of toluene, and 100 g of crude benzyl benzoate is obtained through vacuum distillation. After testing, the GC content of this benzyl benzoate is 99.54%, and the color number is 170 Hazen, which is added to the reaction vessel;
[0038] 2) Add 50 g of 10% sulfuric acid aqueous solution and 0.6 g of magnesium powder to the crude product of benzyl benzoate, then put the reaction vessel into a water bath, stir and raise the temperature to 50° C., and keep it warm for 8 hours;
[0039] 3) After the reaction is finished, it is cooled to room temperature, and the unreacted active metal is removed by filtration;
[0040] 4) The filtrate is stratified again to obtain the upper oil layer;
[0041] 5) Distill and dehydrate the oil layer under reduced pressure at...
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