Process development of short-chain polyols synthesis from corn stover by combination of enzymatic hydrolysis and catalytic hydrogenolysis

Abstract

Graphical abstract

Features of a Staged Acidogenic/Solventogenic Fermentation Process To Improve Butanol Production from Rice Straw

“…A total amount of 45.2–80.3 g butanol was observed from each kg rice straw, of which each g butanol product consumed 221.8–224.5 FPU cellulase. , The cost of enzymes involved in the hydrolysis process almost counteracted the benefit of the cheap feedstocks . If the cellulase enzyme is purchased from Chinese enzyme market at $1.9/kg, with the FPA of 145.0 FPU/g, then the cost of enzymes for each kg butanol production would be counted to approximately $2.9. , In this study, the TSF process produced 1 g butanol and only required 79.3 FPU cellulase; therefore, the enzyme cost would be reduced remarkably by approximately 3-fold to $1.0 for 1 kg butanol.…”

Polymers without Petrochemicals: Sustainable Routes to Conventional Monomers

“…Direct cellulose conversion brings with it difficulties in handling solid cellulose and the need for catalysts capable of performing multiple reactions . As such, the direct conversion of sugars to EG has been investigated under similar conditions, benefiting from higher feasible feedstock concentrations (up to 35 wt %) and enhanced catalyst lifetime in the absence of typical lignocellulosic impurities (Table , entries 7–9). − However, EG yields from sugar hydrogenolysis exceeding 60% have yet to be reported, while reported yields from cellulose are higher . The counterintuitive higher yield obtained from cellulose was attributed to the slow cellulose hydrolysis reaction preventing a build-up of sugars prior to the slow retro-aldol reaction, which otherwise would result in the production of sorbitol and other side-products.…”

“…While less studied, biomass hydrolysates are a more pragmatic feedstock than glucose, and corn stover hydrolysates were converted to EG with a cheap Raney-Ni/NaOH catalyst system with a mass yield of 0.19 g g –1 (Table , entry 10). Compared to the best-reported glucose conversion to EG (mass yield of 0.62 g g –1 ) using a Ni/W catalyst, this reasonably high 0.19 g g –1 yield is promising. , …”

“…reported the highest 1,2-PDO yield from both glucose and cellulose by hydrogenolysis (53 and 42%, respectively) via first converting the feedstock to sorbitol or mannitol at 140 °C and then converting to glycols under pressurized H 2 and in the presence of Ca­(OH) 2 and CuCr (Table , entries 14 and 15). , Directly using lignocellulosic sources presents a more realistic use-case, with a 1,2-PDO yield of 39% achieved with a Ni-W 2 C/AC catalyst from a Jerusalem artichoke feedstock, comparable to the results with purified cellulose (Table , entry 16) . Similarly, hydrogenolysis of lignocellulosic hydrolysates with Raney-Ni and NaOH produces 1,2-PDO as the major product with a yield of 41% (Table , entry 17) …”