Carbocation scavenger pretreatment to mitigate lignin self-condensation in a semi-industrial steam explosion process

Sammanfattning

Softwood bark is a potential resource for biorefineries, abundantly available in the Nordic countries. Meanwhile, carbocation scavenger pretreatment has been suggested as a biorefinery technology beneficial to the enzymatic conversion of softwood. This study aimed to evaluate the effect of 2-naphthol addition for monosaccharide production during enzymatic hydrolysis at high solid loadings of pilot-scale steam-exploded bark mimicking industrial conditions. Multiple linear regression analysis showed that 2-naphthol added as a dry powder with a 5 % dose reduced the hexose hydrolysis recoveries by 0.7 and 0.2 % for glucose and mannose, respectively, while increasing the acid-insoluble and acid-soluble lignin content. The main factors affecting saccharide conversions were reactor temperature and enzyme loading, while acetic acid addition and bark pre-drying had no or little effect. In general, carbocation scavenger addition in the form of 2-naphthol was detrimental to sugar hydrolysis yields, contradicting earlier literature findings.

Nyckelord

Continuous process; Design of experiments; Enzymatic hydrolysis; Pilot -scale; Softwood bark

Publicerad i

Bioresource technology reports
2022, volym: 20, artikelnummer: 101292
Utgivare: Elsevier Ltd

SLU författare

• Larsson, Sylvia

  • Institutionen för skogens biomaterial och teknologi, Sveriges lantbruksuniversitet
    

• Thyrel, Mikael

  • Institutionen för skogens biomaterial och teknologi, Sveriges lantbruksuniversitet
    

• Averheim, Andreas

  • Institutionen för skogens biomaterial och teknologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Trävetenskap
Kemiska processer

Publikationens identifierare

• DOI: https://doi.org/10.1016/j.biteb.2022.101292

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/129695