Iis convenient to clean (open the upper cover of the heater to clean), simple operation, and small footprint . If the vacuum is too large, the ethanol will be sucked away, resulting in a low recovery rate; too large a vacuum will cause excessive boiling of the liquid medicine and loss of liquid medicine. The former needs to supply heat, while the latter needs to take away heat. The transpiration speed is fast, and the concentration ratio can reach 1. The solvent vapor generated by the heated solution contains a lot of heat energy, which is not only not used here, but also consumes a lot of cooling water to cool it (sometimes the refrigeration equipment is opened to ensure the cooling effect).The temperature of cooling circulating water should be lower than 40℃, the lower the temperature, the better the condensation effect. Under normal circumstances, the recovery concentration of ethanol in a single-effect concentrator can reach about 85%, and it can be refined by a distillation tower to reach 90% to 92%. The single-effect concentrator has a large recovery capacity for ethanol, sometimes called an ethanol recoverer, but the energy saving effect is not as good as the double-effect and three-effect concentrators. The vacuum degree should not be too large. The equipment generally uses the combination of external heating natural circulation and vacuum negative pressure transpiration. Precautions for the use of single-effect concentrators:The temperature in the vaporizer should be controlled at about 80°C when recovering ethanol. The greater the output value, the greater the amount of transpiration required, the fermentation tanks more heating steam required, and the more cooling water consumed together. The energy consumption of a single-effect concentrator mainly has two aspects:the industrial steam consumed by heating the dilute solution in the heater to evaporate the solvent in the solution; when the vaporized solvent vapor is then condensed into the solvent liquid , The cooling water required in the condenser. This is the reason for the high energy consumption of single-effect concentrators
