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【答案】应助回帖
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RXMCDM: 2014-06-09 15:31:55
RXMCDM: 金币+1 2014-06-09 15:32:03
donkeyhonesty82: 金币+20, 翻译EPI+1, ★有帮助 2014-06-10 04:16:39
donkeyhonesty82(RXMCDM代发): 金币+5 2014-06-10 07:43:38
We take the 2,6--di-tert-butyl phenol (DTBP) as raw material. After the nitrosation reaction and the reduction reaction, we could get the di-tert-butyl-4-aminophenol (DTBAP). Through the single factors test system, we consider the condition of reaction technology, and get the conclusion: (1) the nitrosation reaction: we can get the products at the rate up to 90% above, if we make 95% ethanol as the solvent, thick hydrochloride as acidification reagents; the amount of the sodium nitrite is 1.25~1.50 times of the Moore volume of the DTBP, the reaction temperature between 15 and 20; reaction time is 2.0~2.5 h. (2) the reduction reaction: we can get the products at the rate up to 92%, if we make the sodium dithionite as the reductant, the reaction temperature between 50 and 55; the amount of the sodium dithionite is more than 2.8 times of the Moore volume of 2,6-di-tert-butyl-4-nitrosophenol. The preparation method is simple, of a mild reaction conditions, easy to control and easy to separate the products, of high total yield, cheap and easy to get the raw materials, low production costs. So it is suitable for industrial production.
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