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Improvement in the process of purificacao of para nitrophenol obtained by phenol nitracao
Improvement in the process of purificacao of para nitrophenol obtained by phenol nitracao
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机译:苯酚硝酸盐制取对硝基苯酚的工艺改进
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摘要
In the nitration of phenol with nitric acid, decantation of the residual acid, and steam distillation of ortho-nitrophenol to leave an aqueous distillation residue of para-nitrophenol, a cleaner purer crystalline para-nitrophenol product is obtained by cooling the hot distillation residue when it contains at least 0.5% of sodium bisulphite and is at pH 5.4 to 6.4.
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