![]() This indicated that caffeine diffusivity was limiting mass transfer and boundary layer effects had become negligible. However, with a solid/liquid ratio of 1:8 the temperature effect was not significant (p 0.05) between extraction rates with solvent flows of 522 and 667 ml/min. For optimal extraction of caffeine from the ground seeds a solid/liquid ratio of 1:6 was adequate at 30☌ (- 90% extraction after 23 h) but not at 25☌. Caffeine was also extracted from 100 g batches of whole seed cores in a solid/liquid packed bed extractor with a solid/liquid ratio of 1:50 (w/w) this was used with three solvent flow rates (436, 522, and 667 ml/min) at two temperatures (21 and 30☌). The experimental design included three solid/liquid ratios and two temperatures (25 and 30☌). ![]() Ground seeds were contacted with solvent in shaking flasks in a controlled temperature water bath. Methylene chloride decaffeination processes for ground and whole guaraná seed cores were evaluated.
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