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Monday, 23 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Chemical building blocks made of wood

Thursday, 31 October 2013

How to produce aromatic building blocks for synthesis of lignin? Electrochemical degradation was a big help.

<strong>Benefit of the organosolv procedure is that all chemical components of wood in a particularly pure form can be win. Source: FNR/Ilka Plötner</strong>
Benefit of the organosolv procedure is that all chemical components of wood in a particularly pure form can be win. Source: FNR/Ilka Plötne...

Lignin is the second most common after cellulose. During the production of pulp from wood they are incurred worldwide in million tonnes scale mainly in the form of so-called strength lignin1. In addition, in the future likely to be large amounts of Organosolv lignin are 2 from lignocellulose biorefineries available. These bio-refineries are a still new and promising approach to win all chemical components of wood in the form of high-purity and chemically driven process.

Raw material of wood could replace fossil resources

Regardless of which method it will be won, a subsequent recycling use of the lignin is usually make more sense as an energetic, thus joins a higher value added. In addition, the raw material of wood could replace fossil resources for which there is no alternative. But even lacks procedures to produce chemicals or materials from lignin, therefore currently producing energy dominates.

Bandwidth conversion paths is only partially evaluated

In two projects, put or put scientists on the approach to extract aromatics from lignin. Aromatics are an important intermediate for the production of plastics, adhesives, coatings, foams, dyes and solvents. Lignin is the only occurring in plants connection, which is available as a source of aromatics in significant quantity is available. The known processes for extracting aromatics from lignin however have a number of disadvantages which make inefficient compared to the petrochemical processes. At the same time, the theoretical usable bandwidth of thermal, electrochemical, chemical and biotechnological conversion paths is only partially evaluated.

Approach allows the lignin degradation under mild reaction conditions

A team of researchers of the University of Mainz, BASF and the Condias GmbH under the symbol "Elektra” investigating the electrochemical way. Particularly appropriate the use of an aqueous electrolyte and electrode alloys turned out to be from electro catalytic active metals. In this constellation, it came to an oxidative degradation with good yields of aromatic value products. The separation of the obtained and already partly due to process preserved aromatic value products from the electrolytic solution was adsorptive. BASF plans to further develop the approach, which allows the lignin degradation under very mild reaction conditions, in a follow-up project.

Applicability of the preserved polymers has to be studied

The scientists of the project started in July "Lignoplast” again examine the following procedures: transfer of the base-catalyzed cleavage of Organosolv lignin on other lignins, oxidative cleavage of the products from the base catalytic cleavage, enzymatic modification and functionalization, chemical-catalytic modification and functionalization, chemical-catalytic modification and functionalization of the fission products by vinylation, glycidolisierung or production of acrylates and subsequent polymerization. Finally, studies on the applicability of the preserved polymers for adhesives, varnishes, resins, polyurethanes and epoxies are on the agenda.

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