ZeaChem - Demonstration Biorefinery System
The hydrolysis unit, an Andritz based system, can process up to 10 tons per day of chipped cellulosic biomass* into separate C5 and C6 sugar streams. The hydrolysis unit can operate using steam explosion, dilute acid/base or auto hydrolysis, in single stage or dual stage configuration. With minor upgrades, the hydrolysis unit can incorporate other pretreatment chemicals and configurations. Enzymatic saccharification is also available at various scales. (*Instantaneous rate for high density material, actual rates will vary.).
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Technology Overview
The fermentation system has environmentally controlled anaerobic fermenters with clean in place and steam sanitation capability. The fermenters include a seed train that can propagate up from 4 gallons to 40 gallons to 400 gallons to 4,000 gallons and then to three 40,000 gallon production fermenters. With minor modifications the fermenters can be configured for aerobic fermentation.
The recovery system includes a solvent extraction and distillation based unit that can recover glacial organic acids from fermenter broths of less than 5%. The recovery system also includes: micro-, ultra-, and nano-filtration, reverse osmosis, centrifugal separation, and distillation capabilities.
The esterification unit is a catalytic reactor capable of converting glacial organic acids into esters in the presence of alcohols. With modification it can also be run as a 2 stage distillation column.
The hydrogenolysis unit is a vapor phase catalytic reactor capable of converting esters into alcohols. With modification it can be configured as a trickle bed catalytic reactor.
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