爱词霸英语   汉语   手机版   软件版下载 | English
每日一句:正在加载...
1.Condensate not picked up by the reflux pump is cooled in heat exchanger E, called the product cooler, and withdrawn as the overhead product.
未被回流泵输送的冷凝液在换热器（或称冷却器）E中被冷却，作为塔顶产品取出。收藏指正
2.Without the reflux, no rectification would occur in the rectifying section, and the concentration of the overhead product would be no greater than that of the vapor rising from the feed plate.
假如没有回流，精馏段就无精馏作用，塔顶产品的浓度就不可能高于来自加料板的上升蒸汽的浓度。收藏指正
3.The effects of reaction medium,reaction time and amounts of acid acceptor pyridine on the yield of the product CDESA were studied and its chemical constitution was proved by elementary analysis,ester value,hydroxyl value and IR spectrum. Thus,the reaction was conducted with n(CMESA)∶n(stearyl chloride)∶n(pyridine)=1∶1∶1 in 1,4-dioxan under reflux for 3 h to give CDESA in 93.1% yield.
研究了反应介质、反应时间和缚酸剂吡啶的用量对生成物CDESA收率的影响,通过元素分析、官能团分析和红外光谱确证其化学结构,最佳合成条件为:n(CMESA)∶n(硬脂酰氯)∶n(吡啶)=1∶1∶1,1,4-二氧六环为反应介质,回流加热反应3h,CDESA收率为93.1%。收藏指正
4.At a certain temperature,the molecularratio of acetic acid to caustic soda is 2.08～2.18∶1 ,the time of reflux reaction 90～120min,the drying time 2.5h and the yield reaches 97.5%. The product quality reaches the standard of FAO/WHO.
在一定温度下 ,n(乙酸 )∶n(氢氧化钠 )为 2 .0 8～ 2 .18∶1,回流反应时间为 90～ 12 0min ,干燥时间为 2 .5h ,收率达 97.5 % ,产品质量达到联合国粮农组织和世界卫生组织标准收藏指正
5.But when aqueous solution of the sodium hydroxide was used as reaction medium, mole ratio of β CD to p toluenesulfonyl chloride was 1∶6,the reaction proceeded at 22℃ for 3h reaction, and anhydrous ethylalcohol was used to reflux and desalt the crude product, the yield (β CD 2 OTs) was 70%.
用氢氧化钠的水溶液作为反应介质，β?环糊精与对甲苯磺酰氯的物质的量比为1∶6，在22 ℃下反应3 h，粗产物用无水乙醇回流脱盐，合成产物是β?CD?2?OTs，产率为70％ 。收藏指正
尝试查询
汉英释义