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| 本帖產(chǎn)生 1 個 翻譯EPI ，點擊這里進(jìn)行查看 | |||
dcjb銀蟲 (小有名氣)
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[求助]
簡單的基礎(chǔ)翻譯：乙酸乙酯的制備 不要有語法錯誤 急求
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在50mL圓底燒瓶中加入9.5mL（0.2mol）無水乙醇和6mL（0.10mol）冰醋酸，再小心加入2.5mL濃硫酸，混勻后，加入沸石，然后裝上冷凝管。 小心加熱反應(yīng)瓶，保持緩慢回流1/2h，待瓶內(nèi)反應(yīng)物冷卻后，將回流裝置改成蒸餾裝置，接受瓶用冷水冷卻。加熱蒸出生成的乙酸乙酯，直到餾出液體積約為反應(yīng)物總體積的1/2為止。 在餾出液中慢慢加入飽和碳酸鈉溶液，并不斷震蕩，直到不再有二氧化碳?xì)怏w產(chǎn)生，然后將混合液轉(zhuǎn)入分液漏斗，分去下層水溶液，有機(jī)層用5mL飽和食鹽水洗滌，再用5mL包和氯化鈣洗滌，最后用水洗一次，分層下層液體。有機(jī)層倒入一干燥的三角燒瓶中，用無水硫酸鎂干燥，粗產(chǎn)物約6.8g。將干燥后的有機(jī)層進(jìn)行蒸餾，收集73～78℃的餾分，產(chǎn)量約4.2g。 |
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vivanslum
木蟲 (正式寫手)
- 翻譯EPI: 94
- 應(yīng)助: 10 (幼兒園)
- 金幣: 5587.9
- 散金: 21
- 紅花: 4
- 帖子: 547
- 在線: 600.7小時
- 蟲號: 1801798
- 注冊: 2012-05-07
- 專業(yè): 環(huán)境工程
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
愛與雨下: 金幣+1 2012-06-07 19:24:23
dcjb: 金幣+140, 翻譯EPI+1, ★★★很有幫助, 翻譯得不錯，實驗翻譯成過去式的就更好了，不過怪我沒說清楚 2012-06-09 12:45:56
愛與雨下: 金幣+1 2012-06-07 19:24:23
dcjb: 金幣+140, 翻譯EPI+1, ★★★很有幫助, 翻譯得不錯，實驗翻譯成過去式的就更好了，不過怪我沒說清楚 2012-06-09 12:45:56
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Add 9.5mL（0.2mol）anhydrous ethanol and 6mL (0.10mol) acetic acid into a 50mL round bottom flask，and then add carefully 2.5mL concentrated sulphuric acid. After mixing thoroughly，add zeolites and install condensation tubes. Carefully heat the reaction flask to maintain a slow reflow during 1/2 h. After the reactants in the flask are cooled down，the reflow device are changed into the distillation apparatus and the receiving flask is cooled down using cold water. Heat the ethyl acetate generated by steam, until the volume of distillate liquid is about 1/2 of the total volume of reactants. Slowly add the saturated sodium carbonate solution into the distillate liquid, with continuous stirring，until there is no generation of carbon dioxide gas. Then transfer the mixture to a separatory funnel and remove the aqueous solution in the lower layer. The organic layer is washed with 5mL saturated salt water，followed by 5mL saturated calcium chloride solution and finally with water，and the lower liquid is removed. The organic layer is transferred into a dry triangular flask，and is dried using anhydrous magnesium sulfate，which produces a crude product about 6.8g. Distill the dried organic layer and collect the fraction of 73 ~ 78 ° C, with a final production about 4.2g. 僅供參考 |
2樓2012-06-07 18:41:17
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