88 distill and rectify are both have very close connection actually, because rectification belongs to distillation category, and a kind of mode of operation that is distillation. Their similar point is the difference of each constituent vapour pressure in using liquid stock namely, realize the course with separate constituent.
What distillation and rectification place differ is, rectification process piece the partial aerification number that the partial condensation frequency of gas phase happening and fluid photograph produce should compare distillation process to be gotten more much, this also is why the product purity that rectification process obtains gets much reason seat higher than distillation process.
No matter be distillation or rectify, their executive process shows in Daneishi, have as multilayer the rectification depart process of tray, that is in with respect to need of a heat insulation multilayer undertake inside the tower of tray, through contact of gas, fluid, make easy volatilize the saturated steam chroma of constituent produces a change.
Meanwhile, gas is chased by tower bottom board rise, make easy volatilize constituent chroma rises gradually, when when reaching cat head, chroma of vapour of this part saturation can be amounted to adjacent pure easy volatilize the chroma of constituent. And the liquid inside the tower is chased by cat head board flow, make easy volatilize constituent chroma is reduced gradually, be close to finally pure difficult volatilize the chroma of constituent.
To make rectification process can undertake continuously, after the refrigeration of aeriform classics condensation from cat head transgression is a liquid, can one part is collected as the product piece, still another part introduces cat head. We evaporate this part normally the liquid of crystallizer regurgitate cat head calls circumfluence fluid.
Same, in the tray of the proper place with mid tower, also be from go up to send raw material to begin continuously into makings board, the place that takes makings board is by mix into material composition decide into material temperature. Tower bottom heats through heat source, make fluid photograph is in bubble to order state from beginning to end, produce gas phase continuously. Such, ascendant gas phase and the fluid that drop had been interlinked to go up in many tray for many times aerification of partial condensation, part, it is difficult to get in tower bottom volatilize the product with constituent high content, get in cat head easy volatilize the product with constituent high content.