What is the function of the pre-distillation tower and what are its main parameters?
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What is the function of the pre-distillation tower and what are its main parameters?
The pre-distillation column serves to remove light components and reduce certain azeotropic impurities; the parameters are: bottom temperature of 82–85, top temperature of 76–78, and reflux temperature around 50. Tower pressure 20KPa
The functions of a pre-tower generally include three: 1. Removing light components, 2. Adding alkali to neutralize organic acids and promote the hydrolysis of carbonyl compounds in order to prevent equipment corrosion, 3. Performing water extraction to remove methanol azeotropes. Generally, the water addition amount is 10-15%, and the amount of alkali required is 2-5 grams per ton of methanol. The temperature at the top of the tower should be maintained between 70-75, while that at the bottom is between 80-85. The pressure at the top of the tower is around 0.05 MP, and the reflux temperature is approximately 45 degrees. Either too high or too low temperatures can affect the purity of pure methanol