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        您當前的位置 : 首 頁 > 產品中心 > 精餾塔設計

        精餾塔

        2021-07-20 17:49:11
        精餾塔
        詳細介紹:

        精餾是利用混合物中各組分揮發度不同而將各組分加以分離的一種分離過程,常用的設備有板式精餾塔和填料精餾塔。精餾的原理及設備流程與普通精餾相同,只是待分離物系中的組分間的相對揮發度較小(<1.05~1.10),因而采用填料以實現待分離組分的分離提純。在單離香料的生產原料一天然精油中經常有同分異構體并存的情況,例如在香葉油、玫瑰油、玫瑰草油等天然精油中同時存在的香茅醇和玫瑰醇就是旋光異構體。


        工作原理:精餾通常在精餾塔中進行,氣液兩相通過逆流接觸,進行相際傳熱傳質。液相中的易揮發組分進入氣相,氣相中的難揮發組分轉入液相,于是在塔頂可得到幾乎純的易揮發組分,塔底可得到幾乎純的難揮發組分。料液從塔的中部加入,進料口以上的塔段,把上升蒸氣中易揮發組分進一步增濃,稱為精餾段;進料口以下的塔段,從下降液體中提取易揮發組分,稱為提餾段。從塔頂引出的蒸氣經冷凝,一部分凝液作為回流液從塔頂返回精餾塔,其余餾出液即為塔頂產品。塔底引出的液體經再沸器部分氣化,蒸氣沿塔上升,余下的液體作為塔底產品。塔頂回流入塔的液體量與塔頂產品量之比稱為回流比,其大小會影響精餾操作的分離效果和能耗。



        Distillation is a separation process that uses the different volatility of each component in the mixture to separate each component. Commonly used equipment includes a plate rectification tower and a packed rectification tower. The principle and equipment flow of rectification are the same as ordinary rectification, except that the relative volatility between the components in the system to be separated is small (<1.05~1.10), so packing is used to realize the separation and purification of the components to be separated. There are often isomers coexisting in natural essential oils, the raw material for the production of isolated fragrances. For example, citronellol and roseol that co-exist in natural essential oils such as geraniol oil, rose oil and palmarosa oil are optical isomers. body.


        Working principle: Distillation is usually carried out in a rectification tower, and the gas and liquid phases are contacted by countercurrent to conduct heat and mass transfer between phases. The volatile components in the liquid phase enter the gas phase, and the hardly volatile components in the gas phase transfer to the liquid phase, so that almost pure volatile components can be obtained at the top of the tower, and almost pure hardly volatile components can be obtained at the bottom of the tower. The feed liquid is added from the middle of the tower. The tower section above the feed port further enriches the volatile components in the rising vapor, which is called the rectification section; the tower section below the feed port extracts the volatile components from the descending liquid Divide, called the stripping section. The vapor drawn from the top of the tower is condensed, a part of the condensate is returned to the rectification tower from the top of the tower as reflux, and the remaining distillate is the top product. The liquid drawn from the bottom of the tower is partially vaporized by the reboiler, the vapor rises along the tower, and the remaining liquid is used as the bottom product of the tower. The ratio of the amount of liquid flowing back into the tower from the top of the tower to the amount of product at the top of the tower is called the reflux ratio, and its size will affect the separation effect and energy consumption of the rectification operation.


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