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It is to be short of for the rectification production to certain product one cannot, the end that its use is to make each constituent is able to depart from inside mixture, the chooses rectification technology such as the separate requirement that should achieve according to corporeal property, place is different likely. Below the respect such as Cong Hengfei rectify, will extractive rectify, catalysis rectify, extraction rectify, hot pump rectify has comprehensive knowledge to this technology.
Constant regards crucial constant boil as the choice of the agent in boil rectify, fundamental is be the 3rd constituent is joined in detached mixed liquor, in order to increase the opposite volatility between constituent, be helpful for their depart thereby. To constant boil rectify, crucial is the choice of constant boil agent, can affect the design of this process directly. And technology of constant boil rectify had matured quite at present, and specific power consumption is lower also, what apply so is more still. Extractive rectify actually the fundamental with constant boil rectify is same, what what just use is extractive agent, because this does not make key introduction. Again for say catalytic rectify, because the process that has chemical reaction is accompanied in catalytic rectify process, because this is opposite for the meeting is a few more complex, although this kind of technology had been carried early, but to now the forehead does not have whole academic system. Extraction rectify technology reclaims to tall purity benzene develops and come from inside hydrogenation coal tar, main payoff is the hydrocarbon in solvent change mixture kind the ability of evaporate steam pressure. And to hot pump rectify, its big characteristic is energy-saving, accordingly special accord with the main demand that industry expands now.