However, the use of the column also has disadvantages:
a significant increase in weight share of aldehydes during start-ups and temporary stoppages of carbon columns
a low processing rate of the water-alcohol mixture
a high consumption rate of carbon (250 to 300 kg/50,000 to 150,000 dal of the water-alcohol mixture)
non-uniform treatment of the water-alcohol mixture (channelling, self-sorting of carbon)
high processing losses of carbon
bulky equipment
inconvenient maintenance
impossibility of batch operation