请教一个比较难做的季铵盐? General procedure: A short column with 0.2 m length and 0.02 m diameter was loaded with 20 g of activated resin. This column was then washed with deionised distilled water. It was then treated with 100 ml of unimolar salt solution containing desired anion. The column was again washed 3–4 times with 100 ml portions of deionised distilled water. 100 ml of 0.1 M aqueous solution of tetrabutylam- monium bromide was then introduced in the column. Few drops of eluent were tested with silver nitrate solution and the absence of bromide ions was confirmed by nonappearance of yellowish white pre- cipitates. Water from the eluent was removed under vacuum (15 mm/Hg) at 60–70 °C temperature. Finally compounds were dried in a vacuum desiccator for 72 h. The ion-exchange cycle for IL syn- thesis is shown in Fig. 1. With KNO 2 in water Bhatt, Vasishta D.; Gohil, Kuldip; Thermochimica Acta; vol. 556; (2013); p. 23 - 29 做出来的东西吸潮,不稳定,放置后不能提纯。有做过类似化合物的高手么?最好是能工业放大。 查看更多1个回答 . 2人已关注
挤出机中的8/O zone? 请教: 双螺杆挤出机 中有一个8/O段,专业上术语是什么,Also, twin-screw extruders require an additional special adaptor piece called an “eight-to-oh” (8/O) zone to convert the twin configuration (which physically looks like a figure eight lying on its side) to an output configuration of the adaptor (zero or the letter “O”). 查看更多2个回答 . 1人已关注