Lignocellulosic ethanol — pretreatment + enzymatic hydrolysis + real fermentation

The bioresource-engineering gap this closes: two existing 'corn-ethanol' showcases in this catalog (superheated-steam-drying-loop, bioethanol-mvr-stillage) are both downstream-only — drying and distillation on an already-fermented feed or a generic surrogate solid, with no bioreactor anywhere in either flowsheet. This is the first biofuel showcase that actually runs a real fermentation: pretreatment (dilute-acid/steam) solubilizes part of the lignocellulosic feed into fermentable sugars, the existing generic enzymatic_reactor (Michaelis-Menten) saccharifies the cellulose fraction left behind, and the existing bioreactor (Monod chemostat) ferments the resulting sugar to ethanol — the real kinetics kernel, not a spec-based separator standing in for the biology.

Bounded, and stated plainly: the pretreatment conversion fraction (hemicellulose -> sugar) is a caller-specified design input — a measured/vendor yield, not a predicted dilute-acid severity-factor (log R0) correlation; inventing one would fabricate exactly the number this flowsheet's answer depends on. Real lignocellulose chemistry (cellulose, hemicellulose, xylose, glucose) carries no enthalpy or density data anywhere in this codebase's thermo databank — every sugar was checked directly and none has a liquid-density or ideal-gas-Cp correlation, so a flowsheet naming them by their real identities cannot solve at all. Real, differently-named organics with full databank coverage stand in 1:1 instead (glycerol for the lignocellulosic solid, acetic acid for the hemicellulose-derived sugar liquor, methanol for glucose) — the same generic-surrogate posture already established elsewhere in this codebase (e.g. ethanol standing in as the dissolved substrate in the perfusion-bioreactor tests). Ethanol itself is the one real target molecule in the chain — no surrogate needed. Kinetic constants (mu_max, Vmax, Km, yields) are illustrative, not fit to a published fermentation study — the same posture the LHHW methanol-synthesis showcase states for its own rate law. The pentose-sugar liquor from pretreatment is not fermented in this showcase (many industrial processes do not ferment it with ordinary yeast either) — it reports to its own product stream rather than being silently discarded. No downstream distillation is attempted: a rigorous VLE column needs every component priceable, and the fermentation broth carries an unpriced 'biomass' pseudo-component (the same class of limitation this session's Gibbs-reactor work hit with elemental carbon) — ethanol recovery is the documented next real step, not modeled here.