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No.

Crude methanol rectification process

Feature

1

single-column process

1.Methonal-water regroup, separate in one column
     2.Advatange: investment saving, reduce heat energy    consumption
     3.Disadvantage: the purity of refined methonal is not    very pure.

2

two-column process

1.The combination of pre-recification column and main rectification    column
     2.Refine crude methonol including dimethyl ether and    other light components and reducing impurities 
     3.Advantage: simple process ,user friendly, less    investment
     4.Disadvange: high energy consumption, low purity

3

three -column process

1.Three rectification column work under the same    pressure. The third rectification column produces
     2.Advantage: high purity
     3.Disadvantage: high investment. Need more area