Low-pressure ethanol recovery device and method with triple effect rectification
An ethanol and low-pressure technology, which is applied in the field of ethanol recovery devices and methods, can solve the problems of high temperature resistance of gaskets, large investment in heat exchange equipment, and easy leakage of liquid, etc., and reduce the requirements for high temperature resistance and corrosion resistance. , Energy consumption reduction, energy saving effect
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[0042] A kind of low-pressure three-effect rectification ethanol recovery device (such as figure 2 shown), including 1# rectification tower 3, 2# rectification tower 7, 3# rectification tower 11, rectification tower reboiler, vacuum system, dilute ethanol feed preheater 1, finished product cooler 16, etc. .
[0043] Ethanol content is the dilute ethanol (flow 200t / h of 50%V / V, 35 ℃ of temperature, sodium chloride content 4wt%) in the dilute ethanol feed preheater 1 through 1# rectifying tower top alcohol vapor preheating to After 50℃, divide into three strands:
[0044] The first dilute ethanol (accounting for 30% of the total feed mass flow rate) enters the 1# rectification tower after being preheated by 1# tower kettle waste water (88 ℃ of temperature) in the feed preheater 2 of 1# rectification tower Feed port, 1# rectification tower 3 is operated by vacuum system negative pressure, operating pressure -75kPa, after the wine vapor at the top is condensed by dilute ethanol...
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