The method for reclaiming perfume grade benzyl benzoate from benzoic acid rectification raffinate
A technology for benzyl benzoate and benzoic acid, which is applied in the field of recovering perfume-grade benzyl benzoate, can solve the problems of pungent odor, high cost, low purity, etc., and achieves reduction of residual impurities, energy consumption, and low distillation temperature. Effect
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Embodiment 1
[0021] Get the benzoic acid rectification raffinate that produces when the toluene oxidation production benzoic acid of certain benzoic acid production factory A is raw material, as figure 1 The process flow shown is processed as follows:
[0022] (1) Vacuum rectification: the benzoic acid rectification raffinate is passed in the rectification tower, the rectification tower tower kettle is heated by the falling film reboiler, and the mode rectification of vacuum rectification is used simultaneously to go out benzyl benzoate Ester crude product A, the conditions of vacuum distillation are pressure 50pa, tower bottom temperature 135°C, tower top temperature 123°C, the obtained benzyl benzoate crude product A has a content of 96.41% (mass fraction), a color number of 140HZ, and a pungent smell ;
[0023] (2) Alkali washing: the above-mentioned benzyl benzoate crude product A and mass fraction 20% sodium carbonate solution are mixed and stirred for reaction, the reaction temperat...
Embodiment 2
[0029] Get the benzoic acid rectification raffinate that produces when the toluene oxidation production of benzoic acid of the B factory that certain benzoic acid produces is raw material, as figure 1 The process flow shown is processed as follows:
[0030] (1) Vacuum rectification: the benzoic acid rectification raffinate is passed in the rectification tower, the rectification tower tower kettle is heated by the falling film reboiler, and the mode rectification of vacuum rectification is used simultaneously to go out benzyl benzoate Ester crude product A, the conditions of vacuum distillation are pressure 70pa, tower tank temperature 150°C, tower top temperature 131°C, the obtained benzyl benzoate crude product A has a content of 95.50% (mass fraction), color number 180HZ, and has a pungent smell ;
[0031](2) Alkali washing: the above-mentioned benzyl benzoate crude product A and mass fraction 15% sodium carbonate solution are mixed and stirred for reaction, the reaction te...
Embodiment 3
[0037] Get the benzoic acid rectification raffinate that produces when certain benzoic acid produces C factory toluene oxidation to produce benzoic acid as raw material, as figure 1 The process flow shown is processed as follows:
[0038] (1) Vacuum rectification: the benzoic acid rectification raffinate is passed in the rectification tower, the rectification tower tower kettle is heated by the falling film reboiler, and the mode rectification of vacuum rectification is used simultaneously to go out benzyl benzoate Ester crude product A, the conditions of vacuum distillation are pressure 130pa, column temperature 170°C, tower top temperature 138°C, the content of crude benzyl benzoate A obtained is 94.87% (mass fraction), color number 190HZ, and has a pungent smell ;
[0039] (2) Alkali washing: the above-mentioned benzyl benzoate crude product A and mass fraction 28% sodium carbonate solution are mixed and stirred for reaction, the reaction temperature is controlled at 40° C...
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