Comprehensive evaluation of Chinese baijiu solid-state distillation operating conditions effect on aroma compounds distillation based on entropy weight-TOPSIS analysis

The solid-state distillation is an essential process to regulate Chinese Baijiu aroma character and quality. Three key solid-state distillation operation conditions, bulk density, bed height and steam flowrate, influence of aroma compounds distillation efficiency of Baijiu were studied through an experimental solid-state distillation equipment which was designed to represent the operation conditions effecting. The operation conditions effects showed that the bulk density decreasing led to most aroma compounds decrease; the bed height decreasing effected alcohols and acids increasing; the steam flowrate increasing led most aroma compounds increasing. Entropy weight-TOPSIS comprehensive evaluated bed height conditions change had the greatest score 0.05837 on total aroma compounds distillation efficiency, especially in alcohols of 0.06908 and acids of 0.06241. For esters of 0.06777, steam flowrate had most influence. Aldehydes, ketones and phenols, bulk density of 0.05975 was most effective. This study provided a scientific solution for the screening of different aroma compounds distillation methods.