UC知道专业翻译（化学类的）（别拿google、yahoo翻译忽悠我）
来源：百度知道 编辑：UC知道 时间：2024/09/22 06:56:54
2. 实验所用的Raney nickel为回收的，再生方法：加入一定量的乙醇和w(NaOH)=2%溶液于70℃下搅拌回流2-3h，移去溶剂，水洗至中性，再用乙醇洗2-3次,保存于乙醇中备用。
3. 用Pd/C作催化剂时，反应进行很慢，基本得不到产物。
4. 实验过程中可能出现滤液为蓝褐色，收集滤液，真空浓缩时，溶液逐渐浑浊，析出绿色固体，过滤得到淡黄色溶液，滤饼用水和乙醇洗涤均不溶，用氨水洗涤即溶解。析出的绿色固体可能是由于Raney nickel不是新制的，活性变化，生成的一种含Ni的化合物，可以与NH3结合形成络合物溶于水，真空浓缩NH3被蒸走，此绿色固体即析出。
5. 用乙醇重结晶时，产物在乙醇中呈粘状，纯化难度大，损失较大，一般静置1-2天析晶，再过滤干燥。研究发现，用甲醇重结晶时有更好的效果，产物在甲醇中大部分呈晶状。
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1. Recovery of the methanol-water solution containing acrylonitrile, can be used in response to the next, as well as for the recrystallization of ethanol can be recycled after distillation.
2. Experimental use of Raney nickel for the recovery, renewable ways: by adding a certain amount of ethanol and w (NaOH) = 2% solution at 70 ℃ under the stirring back to 2-3h, remove solvent, washed to neutral, and then ethanol Wash 2-3 times, save on back-up in ethanol.
3. With Pd / C as catalyst, the reaction is slow, lack of basic products.
4. Experiment that may arise as a blue-brown filtrate to collect filtrate, vacuum concentration, the solution gradually pollution, solid precipitates green, yellow solution to be filtered, the cake washing water and ethanol is not dissolved, that is, washing with ammonia solution. The solid green Precipitates may be due to the Raney nickel is not the new system, changes in the activity, generate