Alcohol recovery towerWorking principle and correct operation

1Alcohol recovery towerWorking Principle:

By utilizing the principle that the boiling point of alcohol is lower than that of other solutions, the dilute alcohol solution to be recovered is heated and evaporated at a temperature slightly higher than the boiling point of alcohol. After distillation in the tower, pure alcohol gas is released to increase the concentration of the alcohol solution and achieve the goal of recovering alcohol.Alcohol recovery towerSuitable for the recovery of dilute alcohol in industries such as pharmaceuticals, food, light industry, and chemical engineering. It is also applicable to the distillation of other coal soluble products such as methanol. The alcohol recovery tower uses circulating cooling water to cool the ethanol gas and condense it to obtain the recovered ethanol. Of course, it is not possible to condense everything at once, or to connect several recovery towers in series, or to condense and recover in sections inside the tower. If it is an absorption tower, it depends on whether ethanol is absorbed as a product or a byproduct. Organic compounds can be condensed at different temperatures based on their different condensation points to obtain different products.

IIAlcohol recovery towerConstruction:

The alcohol recovery tower consists of six parts: tower kettle, tower body, condenser, cooler, buffer tank, and high-level storage tank. It has good corrosion resistance and the advantages of energy saving, environmental protection, reduced production costs, and yield improvement. Dilute alcohol at 30-50 degrees can be distilled to 93-95 degrees, and the residual liquid discharge has low alcohol content. The alcohol recovery tower meets environmental requirements. This device uses stainless steel corrugated packing, and all parts in contact with the material are made of stainless steel. The outer surface of the equipment is treated with a matte finish, which complies with GMP pharmaceutical standards.

3、 Correct operation method for alcohol recovery tower:

1. Recycle the alcohol and add it to the distillation kettle until it reaches 1/2-2/3 of the tank before proceeding with the operation.

2. Open the steam valve for heating (gauge pressure 0.2-0.5MPa) to allow ethanol vapor to enter the tower.

3. Open the cooling water of the tube condenser and the coil cooler, so that the ethanol vapor in the tower enters the condenser and condenses into liquid. Open the reflux valve to allow all the condensed liquid to flow back into the tower.

4. When the temperature at the top of the tower stabilizes below 78.5 ℃, open the discharge valve and observe from the flow meter. Control the reflux ratio of 1:2-1:3 to maintain the concentration of recovered ethanol above 93%.

5. During distillation operation, it is not allowed to leave the post at will. The concentration of recovered ethanol should be observed at all times, and the reflux ratio should be adjusted in a timely manner. When the concentration is high, the reflux ratio is smaller, and when the concentration is low, the reflux ratio is larger. Make the recovered ethanol reach the required concentration.

6. If the amount of recovered ethanol is large, a continuous feeding method can be used. After heating the distillation kettle to boiling, a small amount of continuous material can be added to the distillation kettle at a rate consistent with the rate of ethanol evaporation.

7. As the distillation is about to end, when the temperature in the distillation rises to 100-102 ℃, the temperature at the top of the tower also increases accordingly. At this point, the reflux valve should be closed and the steam flow rate of the distillation kettle should be appropriately increased to evaporate the residual ethanol in the kettle and tower. Collect in a dilute ethanol storage tank and distill together with the next batch of dilute ethanol.