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VERFAHREN UND ANLAGE ZUR ABTRENNUNG VON HOLZINHALTSSTOFFEN AUS BEI DER HOLZVERARBEITUNG ENTSTEHENDEN GASEN

Separating wood constituents from gases produced during wood processing comprises contacting crude gas produced from wood with liquid.
 
: Sievers, M.; Becker, M.; Greubel, D.

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DE 2000-10021951 A: 20000505
EP 2001-940122 AW: 20010405
WO 2001-DE1310 A: 20010405
EP 1278588 A1: 20030129
B01D0053
Deutsch
Patent, Elektronische Publikation
Fraunhofer WKI ()

Abstract
WO 200185310 A UPAB: 20020321 NOVELTY - Separating wood constituents from gases produced during wood processing comprises contacting the crude gas produced from the wood with liquid. DETAILED DESCRIPTION - Separating wood constituents from gases produced during wood processing comprises intensively contacting the crude gas produced from the wood processing at more than 40 deg. C and more than 0.5 bar with a liquid to produce a material exchange between a gas a liquid phase which leads to an enrichment of resins, organic acids and dust particles in the liquid phase 1 (I); cooling the partially purified crude gas by a temperature difference of more than 10 deg. C with simultaneous condensation of the contents still in the crude gas to form a liquid phase 2 (II) consisting of water and different wood constituents such as materials of the substance groups terpene, methanol, ethanol and carboxylic acid present in dissolved form or as floating emulsified phase; and removing the terpenes and the floating phase from the liquid phase 2 (II) to leave a low charged water phase (fraction 3). An INDEPENDENT CLAIM is also included for a device for carrying out the process comprising a first stage (1) formed by a scrubbing column (4) with a cooling and/or heating sump (5) for the mixing and the material exchange of the gas phase formed by the crude gas and a liquid phase, and a circulating system for the liquid phase, and a connection to the circulating system to deviate a partial stream; a second stage (2) formed by a condenser (7) for cooling the partially purified crude gas with simultaneous condensation of condensable gas constituents, and a cooling container (8) for collecting the condensate with a run-off for the liquid phase and a gas outlet for the pure gas; and a third stage (3) formed as a cooling light material separator for removing terpenes from the liquid phase 2 (II). Preferred Features: The water phase (fraction 3) is worked up using a biological process, a membrane process, electrodialysis, wet oxidation or chemical oxidation. USE - Used for separating wood constituents from gases produced during wood processing. ADVANTAGE - The process is economical and is environmentally friendly.

: http://publica.fraunhofer.de/dokumente/N-44883.html