The present invention is a process for filling a storage tank with a biomass pulverized product and a liquid catalyst by introducing a biomass pulverized product and a liquid catalyst into a storage tank, a process of transferring a mixture of the liquid catalyst and the biomass crushed product in the storage tank to a high-pressure reactor for hydrolysis, And continuously performing a process of separating a liquid catalyst and a liquid containing a biomass extract from the hydrolysis product obtained in the hydrolysis process and a solid, continuously.
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