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分析了以对氨基苯酚为原料经重氮化、水解法制备对苯二酚的机理及方法,研究了对苯二酚制备过程中的主要工作介质硫酸进行水解反应和重氮化反应的回收套用方法。结果表明,浓缩回收后的废硫酸总含盐量小于15%,将其多次用于水解反应,是可行的。酸回收后,其中的盐含量小于1.7%,HQ含量小于0.05%,尿素、硫脲含量维持较低数值下,将其套用于重氮化反应,同样可行。这一研究结论为对氨基苯酚重氮化水解法制备对苯二酚工业化生产奠定了基础。
The mechanism and method of preparing hydroquinone by diazotization and hydrolysis of p-aminophenol were studied. The recovery of diazotization reaction and reaction of sulfuric acid, the main working medium in hydroquinone production, were studied method. The results show that the total salt content of waste sulfuric acid after concentration recovery is less than 15%, and it is feasible to use it several times in the hydrolysis reaction. Acid recovery, the salt content of less than 1.7%, HQ content of less than 0.05%, urea, thiourea content maintained at a lower value, the set applied to the diazotization reaction is equally viable. The conclusion of this study laid the foundation for industrialized production of hydroquinone by diazotization of aminophenol.