Vapor pressure digestion

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The vapor pressure digestion is a physical process of fiber digestion for recovery of natural fibers in bast fiber plants, such as flax or hemp , which allows separation of the cell assembly into individual fibers ( cottonization ). The vapor pressure digestion can also be used to pretreat lignocellulose-containing biomass in order to improve subsequent processes such as enzymatic hydrolysis.

technology

The fiber-containing plant stems are strongly heated under high pressure with (alkaline) steam. This is followed by a rapid reduction in pressure, at which the water contained in the plants evaporates, which causes the cell network to break down into individual fibers. The technology has so far mainly been used on a laboratory scale, but is judged to be ready for industrial implementation. A technique without the process of spontaneous pressure release is also known as vapor pressure refiner digestion .

Individual evidence

  1. ↑ a b Monika Scheer-Triebel, J. Léon: Industrial fiber - description of quality and possibilities for influencing fiber plants in terms of plant cultivation: a literature review. Crop Science 4 (1), 2000; Pp. 26-41. ISSN  1431-8857 .
  2. ↑ Wolfgang Stelte: Steam explosion for biomass pre-treatment. (PDF; 2.6 MB) 2013, accessed on April 6, 2020 (English).
  3. ↑ Valuable hemp fiber is unruly. In: LID-Mediendienst 2551, January 31, 2002, pp. 7–8
  4. ↑ Fokko Schütt, Bjørge Westereng, Svein J. Horn, Jürgen Puls, Bodo Saake : Steam refining as an alternative to steam explosion . In: Bioresource Technology . tape 111 , 2012, p. 476-481 , doi : 10.1016 / j.biortech.2012.02.011 .
  5. ↑ Malte Jörn Krafft, Marie Bendler, Andreas Schreiber, Bodo Saake : Steam Refining with Subsequent Alkaline Lignin Extraction as an Alternative Pretreatment Method to Enhance the Enzymatic Digestibility of Corn Stover . In: Agronomy . tape 10 , no. 6 , 2020, p. 811 , doi : 10.3390 / agronomy10060811 .