THE INFLUENCE OF TENSO-PULSE MODULATION ON CONVERTING LIGNOCELLULOSIC MATERIALS IN ALKALINE SOLUTIONS
UDC 676.022.62-915.3+ 534.143
Abstract
The article examines the influence of acoustic (tenso-pulse) effects on the processing of birch and spruce wood in a solution of sodium hydroxide and sodium sulfide in order to intensify the pulping process. The vibration was created using the ability of a steel conductor to compress and elongate when an intermittent short circuit occurs. Since the conductor-antenna is rigidly fixed to the reaction vessel, vibrations are transmitted to the contents. At a certain frequency and amplitude set on the generator, a low-energy effect on wood processing occurs, leading to a decrease in wood residues, an increase in cellulose yield and an increase in the optical density of the solution at wavelengths corresponding to the absorption of lignin. Optimal exposure frequencies are 170 kHz for birch wood and 180 kHz for spruce wood in solutions of sodium hydroxide and sodium sulfide. The optimal amplitudes generated on the oscillator are in all cases around 3 V. The effect is maintained when increasing the autoclave capacity from 150 ml to 1500 ml and stirring. The lignin content in cellulose obtained in a 1500 ml autoclave is reduced as a result of mixing and vibration generated by a generator with a selected frequency and amplitude. The experimental results were analyzed using traditional forest chemical methods. It is assumed that the effect occurs due to the formation of rotating liquid clusters during vibration.
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