Activated carbon is known to have high affinities for colored impurities in hydrolyzate of sugar mixtures, and its unit cost is relatively lower and it can be reactivated and reused.
It has been found that the affinities of acetic acid and furfural (and HMF) are much higher than that of the sugars. The key parameters include activated carbon particle size (surface areas), the ratio of activated carbon to hydrolyzate, temperature, and adsorption time, etc.
The activated carbon can be packed into a column and the hydrolyzate will be pumped into the column. The residence time will be determined by the flow rate and the length of the column.
A inline IR or UV detector can be used to monitor the compounds in the eluent.
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