Carbonization (wood)
As carbonising a process for is the thermal conversion of wood in heat-treated wood , respectively. The cellulose in the wood is partially cross-linked by caramelization and partially charred . This changes various material properties such as color, smell, hardness and biodegradability . Carbonation is also used in the wood industry.
bamboo
The grass plant bamboo is processed into products similar to solid wood , among other things . For this purpose, the hollow bamboo branches are split into lamellas after harvesting, which are then glued to solid boards and beams comparable to sawn timber .
The slats are carbonized for the production of floor coverings and in the furniture industry when the following material properties are to be achieved:
- Distinctive dark color
- Improved resistance to insects that live on sugar in bamboo
- Improved resistance to fungi
For the chemical conversion of the sugar and other components contained in the bamboo in a process similar to hydrothermal carbonization, the bamboo lamellae are exposed to a pressure of 5 kg / cm² and a temperature of 150 ° C in a pressure vessel . Under these conditions, reaction products develop in around 20–30 minutes, which stain the bamboo brown. Usually, hydrothermal carbonization makes bamboo softer. The slats are then flattened and dried before they are glued to solid bamboo products or floor coverings. However, processes are also used that are intended to maintain hardness or even promise hardening .
A complete carbonization of bamboo only sets in at higher temperatures. In a pyrolysis process , bamboo can be transformed into bamboo charcoal (compare charcoal ) at temperatures of around 800 degrees . It is scientifically investigated whether carbon compounds produced from bamboo are suitable as pyrogenic carbon for ecologically favorable CO 2 storage . In a completely carbonized state, bamboo is suitable as an adsorbent , similar to activated charcoal . Bamboo charcoal has numerous pores that quickly and easily adsorb volatile organic compounds as well as moisture, odors, etc. It is therefore used as a fiber component in the textile industry, among other things.
Individual evidence
- ↑ [1]
- ↑ Ecologically effective CO 2 storage ( memento of the original from January 11, 2012 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Patent for textile fibers with bamboo charcoal
Web links
- Bamboo as a building material Bamboo as a building material.pdf, page 11, specifies the conditions for carbonization