Scheme of technology for congruent dehydration of bioethanol in semi-arid way
2011
Bremers, G., Latvia Univ. of Agriculture, Jelgava (Latvia) | Birzietis, G., Latvia Univ. of Agriculture, Jelgava (Latvia) | Blija, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Danilevics, A., University of Latvia, Riga (Latvia) | Skele, A., Latvia Univ. of Agriculture, Jelgava (Latvia)
A method of bioethanol dehydration and a scheme for its realization are offered. The proposed method includes mash distillate rectification and simultaneous water adsorption in the pouring or downwards moving moist adsorbent layer, by feeding the mash distillate vapour flow and the flow of the adsorbent in the rectification and adsorption block, as well as the used adsorbent removing and regenerating of the adsorbent in the adsorbent regeneration unit for reuse in bioethanol dehydration. The active granular adsorbent is used as the adsorbent, which during the feeding in the rectification and adsorbing block is moistened with alcohol solution - intermediate product of the overazeotropic concentration dehydration process, and then the action of moistened adsorbent on dehydrated alcohol vapour injected in the middle of the block is provided, but the water from the used granules is separated by evaporating it in the granule regeneration block. The intermediate product of dehydration process - overazeatropic concentration alcohol solution, necessary for the moistening of adsorbent granules, is removed from the rectification and adsorption block zone, where the alcohol level of intermediate liquid is in range from 97.5 to 98.5 volume percent, by filtering intermediate liquid from the wet adsorbent granules.
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