Technical Economic Evaluation of a Hardwood Biorefinery Using the "Near-Neutral" Hemicellulose Pre-Extraction Process

Mao, Huajie; Genco, J.M.; Yoon, Sung-Hoon; Heiningen, Adriaan van; Pendse, Hemant P.

doi:10.1166/jbmb.2008.309

Cited by 70 publications

(63 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These findings on the effect of pre-treatment on the pH of the resulting extract, wood loss, and the dissolution of carbohydrates are in line with findings reported in previous studies. Mao et al (2008) reported a wood loss of about 10% at a near-neutral pH of the resulting extract. These wood loss data are slightly lower than that observed in the present study, due to the different pre-treatment temperature and raw material used.…”

Section: Effects Of Pre-treatment Conditions On the Solubilization Ofmentioning

confidence: 99%

“…These results indicated that the green liquor pre-treatment was more selective, and that as a result, degradation of the cellulose was minimal. Presumably, maintaining a near-neutral pH minimizes random hydrolysis of carbohydrates (Ladisch et al 2005;Mao et al 2008), resulting in a higher retention of cellulose. Referring to wood losses and carbohydrate yield data in Table 1 and Fig.…”

Section: Effects Of Pre-treatment Conditions On the Solubilization Ofmentioning

confidence: 99%

“…Maintaining a near-neutral pH prevents excessive carbohydrate hydrolysis (Ladisch et al 2005;Mao et al 2008). Furthermore, a near-neutral pH preserves dissolved hemicelluloses as oligomers, which minimize the formation of sugar degradation products (Hamelinck et al 2005;Zheng et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a near-neutral pH preserves dissolved hemicelluloses as oligomers, which minimize the formation of sugar degradation products (Hamelinck et al 2005;Zheng et al 2009). Mao et al (2008) reported an extract with a near-neutral pH when performing the extraction of hemicelluloses from North American mixed hardwoods using green liquor. When the hemicellulose extraction was limited to 45 kg/ton of wood chips, the pulp quality was comparable to that of the pulp produced without hemicellulose extraction.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hemicellulose Extraction from South African Eucalyptus grandis using Green Liquor and its Impact on Kraft Pulping Efficiency and Paper Making Properties

Johakimu

Andrew

2013

BioResources

View full text Add to dashboard Cite

The feasibility of enhancing the efficiency of the kraft pulping operations while at the same time evolving the process into a biorefinery, and thus producing hemicelluloses together with paper products, was studied. Hardwood chips (Eucalyptus grandis) were pre-treated with green liquor prior to pulp production. At optimal pre-treatment conditions, the pH of the resulting extract was 7.8, the wood weight loss was 14%, and the hemicellulose extracted was almost 40 kg/ton of woodchips. In the subsequent kraft pulping, the resulting data revealed that the woodchips from which hemicellulose had been pre-extracted could be pulped much faster than woodchips pulped without hemicellulose extraction. As a result, to maintain the target kappa number, a 20% reduction in pulping chemicals was achievable. Hemicellulose pre-extraction led to a 10% reduction in black liquor solid contents. Moreover, the strength properties of the pulps produced with and without hemicellulose extraction were comparable. Industrial acceptance of this concept, however, still requires a more accurate understanding of the effect of specific mill operating conditions on mill energy balance. Careful economic assessment of the options for handling the calcium carbonate scale problem will also be required before the technology can be considered for implementation.

show abstract

Section: Effects Of Pre-treatment Conditions On the Solubilization Ofmentioning

confidence: 99%

Section: Effects Of Pre-treatment Conditions On the Solubilization Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hemicellulose Extraction from South African Eucalyptus grandis using Green Liquor and its Impact on Kraft Pulping Efficiency and Paper Making Properties

Johakimu

Andrew

2013

BioResources

View full text Add to dashboard Cite

show abstract

“…Softwood hemicellulose rapidly degrades under alkaline conditions due to peeling reactions. Green liquor pretreatment to obtain fermentable sugars from hemicellulose has been studied and modeled as a natural biorefinery opportunity for kraft mills (Mao et al 2008(Mao et al , 2010Lundberg et al 2012;Phillips et al 2013;Andrew et al 2014). Prehydrolysis and extraction of hemicellulose under the right conditions may improve the bleachability of pulp and reduce loading on the recovery evaporators.…”

Section: Chemical and Enzymatic Treatmentsmentioning

confidence: 99%

Integrating a Biorefinery into an Operating Kraft Mill

Johnson¹,

Hart²

2016

BioResources

View full text Add to dashboard Cite

Kraft pulp and paper mills have several advantages for serving the emerging biorefinery industry as a source of raw materials. This review examines technologies for producing liquid biofuels, chemicals, and advanced materials from woody feedstocks to generate new sources of revenue. Market pull comes in part from government policies that drive substitution of petroleum-based products with biobased equivalents. Kraft mills have ample networks to supply feedstocks, whether these are forest residues or byproduct side streams. Pulp mills are well suited to expand sufficiently to accommodate production of value added platform chemicals that are in demand because of brand owner sustainability commitments.

show abstract