Processing of hemicellulose in wheat straw by steaming and ultrafiltration – A novel approach

Water-soluble xylans useable for many potential applications can be produced based on the hydrolysis of wheat straw within a fixed bed using saturated steam to provide a xylan-rich hydrolysate low in particles and lignin enabling an effective ultrafiltration and xylan separation. Under defined conditions (180 °C, 10 bar, 35 min), a degree of solubilization of 29.6 % for straw and of 63 % for hemicellulose is achieved. The dry mass of the resulting hydrolysate consists of at least 58 % xylose and arabinose. The xylose is mainly (87 %) present in non-monomeric form and appears to have a broad molecular weight distribution. Ultrafiltration with commercial membranes (4 to 50 kDa) is being investigated for the separation of the target fraction; here significant differences in the filtration behavior and rejections from 9 to 81 % for carbohydrates and from 13 to 48 % for phenolic compounds (lignin), respectively, are found.

Subjects

Hemicellulose

Steaming

Ultrafiltration

Wheat straw

Xylooligosaccharides

DDC Class

660: Chemistry; Chemical Engineering

Funding(s)

TI-Bioraffinerien: ELBE-NH- Effizienzsteigerung von Lignin Bioraffinerien durch Ergänzende Nutzung von Hydrolysaten (Teilprojekt F)

Projekt DEAL

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

1-s2.0-S0960852423014992-main.pdf

Type

Main Article

Size

1.57 MB

Format

Adobe PDF

Options

Processing of hemicellulose in wheat straw by steaming and ultrafiltration – A novel approach