资源新版在线天堂-桌下含校园污肉高h-坠落女教师-椎名由奈在线播放-六月色婷婷-六月丁香婷婷天天在线

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 專業知識 » 正文

其它類型的蒸餾

放大字體  縮小字體 發布日期:2008-09-18
核心提示:In rotary evaporation a vacuum distillation apparatus is used to remove bulk solvents from a sample. Typically the vacuum is generated by a water aspirator or a membrane pump. In a kugelrohr a short path distillation apparatus is typically used (gen


In rotary evaporation a vacuum distillation apparatus is used to remove bulk solvents from a sample. Typically the vacuum is generated by a water aspirator or a membrane pump.

In a kugelrohr a short path distillation apparatus is typically used (generally in combination with a (high) vacuum) to distill high boiling (> 300 °C) compounds. The apparatus consists of an oven in which the compound to be distilled is placed, a receiving portion which is outside of the oven, and a means of rotating the sample. The vacuum is normally generated by using a high vacuum pump.

The process of reactive distillation involves using the reaction vessel as the still. In this process, the product is usually significantly lower-boiling than its reactants. As the product is formed from the reactants, it is vaporized and removed from the reaction mixture. This technique is an example of a continuous vs. a batch process; advantages include less downtime to charge the reaction vessel with starting material, and less workup.

Destructive distillation involves the strong heating of solids (often organic material) in the absence of oxygen (to prevent combustion) to evaporate various high-boiling liquids, as well as thermolysis products. The gases evolved are cooled and condensed as in normal distillation. The destructive distillation of wood to give methanol is the root of its common name - wood alcohol.

Pervaporation is a method for the separation of mixtures of liquids by partial vaporization through a non-porous membrane.

Dry distillation, despite its name, is not truly distillation, but rather a chemical reaction known as pyrolysis in which solid substances are heated in a strongly reducing atmosphere and any volatile fractions are collected.

Extractive distillation is defined as distillation in the presence of a miscible, high boiling, relatively non-volatile component, the solvent, that forms no azeotrope with the other components in the mixture.

Flash evaporation (or partial evaporation) is the partial vaporization that occurs when a saturated liquid stream undergoes a reduction in pressure by passing through a throttling valve or other throttling device. This process is one of the simplest unit operations.

Freeze distillation is an analogous method of purification using freezing instead of evaporation. It is not truly distillation, and does not produce products equivalent to distillation. This process is used in the production of ice beer and ice wine to increase ethanol and sugar content, respectively.

Codistillation is distillation which is performed on mixtures in which the two compounds are not miscible.

在旋轉蒸發中,使用真空蒸餾設備將大量的溶劑從樣品內除去。真空由水抽子或隔膜泵產生。

在kugelrohr蒸餾中,通常使用短程蒸餾設備(一般與高真空結合),以蒸餾高沸點(> 300 °C)的化合物。該設備包括一個放置被蒸餾的化合物的爐子,一個處于爐子外的接收部分以及樣品旋轉設備。一般使用高真空泵來產生真空。

反應蒸餾的過程涉及到用作反應釜的蒸餾釜。在這一過程中,反應產物的沸點比反應物沸點低得多。產物由反應物形成的同時,就被汽化并從反應混合物中去除。該技術是連續式蒸餾與間歇式蒸餾相對的例子。優點包括:給反應釜內添加原料的停工時間少;工作量小。

分解蒸餾涉及到對固體物質(常為有機物)在缺氧條件下的強烈加熱(以防燃燒),以蒸餾去各種高沸液體及熱分解產物。與常規蒸餾一樣,分解蒸餾中所產生的氣體被冷卻并冷凝下來。產出甲醇的木材分解蒸餾是甲醇普通名稱(木醇)的根源。

滲透蒸發是一種通過非多孔膜對液體混合物進行部分汽化的分離方法。

干餾,盡管名稱如此,但實際上不是蒸餾,而是一種廣為人知的熱分解反應,反應中,固體物質在強烈的減壓狀態下受熱,任何揮發性組分都被收集下來。

淬取蒸餾的定義為:有易混合的、高沸的、相對難揮發的組分和溶劑存在下的蒸餾,且這些組分和溶劑不與混合物中的其它組分形成恒沸物。

快速蒸發(或部分蒸發)是讓飽和液流通過節流閥或其它節流裝置,使其經歷壓力減小而發生的部分汽化。


冷凍蒸餾是一種用冷凍代替汽化的類似的提純方法。它其實不是蒸餾,也不產生與蒸餾等同的產物。此法用于冰啤酒和冰葡萄酒的生產中,以分別增加乙醇和糖的含量

共餾是對由不易混合的兩種化合物組成的混合物進行的蒸餾。

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: 類型 蒸餾
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 2.393 second(s), 463 queries, Memory 2.53 M
主站蜘蛛池模板: 99视频在线观看视频| 午夜福利理论片高清在线| 亚洲精品入口一区二区乱麻豆精品| 成年无码av片| 日韩中文字幕亚洲无线码| 10分钟免费观看视频| 最新 国产 精品 精品 视频 | 人人在线碰碰视频免费| MELODY在线播放无删减| 欧美在线激情| 岛国片在线免费观看| 色欲国产麻豆一精品一AV一免费| 村上里沙快播| 四川少妇大战4黑人| 国产视频精品免费| 亚洲精品第一页| 久久久无码精品亚洲日韩按摩| 一本道高清不卡v免费费| 快播h动漫网站| chinese耄耋70老太性| 日本熟妇乱人伦A片精品软件 | 国产性色AV内射白浆肛交后入| 亚洲AV中文字幕无码久久| 国产在线视频一区二区不卡| 一个人免费完整观看日本 | 啪啪漫画无遮挡全彩h同人| 超碰在线线公开免费视频| 午夜爱情动作片P| 久久国语精品| gogo亚洲肉体艺术照片9090| 污文乖不疼的| 久久久国产精品免费A片3D| SORA是什么意思| 午夜小视频免费观看| 麻豆精品一区二正一三区 | 精品一区二区三区色花堂 | 粉嫩自拍 偷拍 亚洲| 迅雷哥在线观看高清| 久久午夜一区二区| 冈本视频黄页正版| 樱桃BT在线观看|