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北京石油化工学院2026年研究生招生接收调剂公告
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洋葱头onion

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[交流] 请教树脂合成步骤中的小问题 已有2人参与

合成步骤的原文:
I . Preparation of Cyclohexanone-Formaldehyde-Resin
The cyclohexanone-formaldehyde (CF) resin was prepared according to ref[1] Into
a three-necked flask 100 g of cyclohexanone, 40 g of cyclohexane, and 24.5 g of formaline
were added and under stirring heated to a temperature of 60"C, then 0.18 ml of  20% NaOH were added in three equal portions. When the temperature of the mixture
rose to 70- 75 "C refluxing began. Then 73.5 g of formaline and 1.80 ml of 20%
NaOH were mixed and added continuously at a gradually increasing rate sufficient to
maintain vigorous refluxing. After two hours, the reaction was completed and the
mixture was neutralized with dilute acetic acid. It was then washed several times with
hot water and dried azeotropically with toluene.
问题:下划线部分怎么理解,是将0.18ml的烧碱分三次加入,还是加三次,每次0.18ml?
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ycfxyh

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dashyi: 金币+1 2012-04-15 20:06:35
下划线部分的理解是将0.18ml的烧碱分三次加入。
学无止境
2楼2012-04-15 16:09:22
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洋葱头onion

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引用回帖:
2楼: Originally posted by ycfxyh at 2012-04-15 16:09:22:
下划线部分的理解是将0.18ml的烧碱分三次加入。

那也太少了吧
3楼2012-04-15 17:26:12
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figosu2003

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我理解成分三次加入
40而立
4楼2012-04-16 15:53:58
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