Pervaporation at the vapor pressure limit: Vanillin

Obtenção de vanilina: oportunidade biotecnológica

“…A β-ciclodextrina foi utilizada para separar e concentrar vanilina pela formação de complexos de inclusão e gerou resultados satisfatórios, como o aumento de rendimento de vanilina 20 . A habilidade das ciclodextrinas de formar complexos de inclusão está-veis com moléculas orgânicas provocou uma mudança nas propriedades físicas dos ligantes, incluindo sua solubilidade em meios aquosos, e diminuiu a inibição do substrato e do produto [55][56][57] . A absorção de vanilina por polímeros especiais e sua posterior remoção a altas temperaturas permite a diminuição da concentração de vanilina na fase aquosa, reduzindo os problemas da inibição através da toxicidade celular da vanilina e permitindo a extração do produto 58 .…”

Recovery of Biosynthetic Products Using Membrane Contactors

“…strain [Dongliang et al, 2007] in a fed-batch process. Pervaporation was also a proposed for product removal [Boddeker et al, 1997], however, owing to the low volatility, the vanillin flux was quite low at the bioconversion temperature. The aim of this work is to evaluate the potential of using membrane contactor technology for the recovery of vanillin from bioconversion broths in view of an integrated bioconversion -separation process.…”

Efficient recovery of high‐purity aniline from aqueous solutions using pervaporation‐fractional condensation system

“…12 In contrast, for the separation of components such as vanillin or phenol with high boiling points (high boilers) from aqueous solutions, the target products are generally trapped in the first condenser with a purity as high as >99%. 13,14 In this case, additional purification steps for the target products such as evaporation, crystallization, or dehydration by hydrophilic pervaporation will be no longer needed. Consequently, investment and operating costs related to additional processing will be saved.…”

“…Among the organic compounds separated by organophilic pervaporation, many of them are high-boiling compounds (boiling point >1008C). Apart from being widely studied biofuels (e.g., bio-butanol/bio-ethanol), many high-boiling aroma compounds such as 1-octen-3-ol, 15,16 ethyl hexanoate, 17,18 and vanillin 13,19,20 were also recovered from fermentation broth by organophilic pervaporation. These aromas may be recovered as high-purity forms from aqueous solutions by pervaporation integrated with fractional condensation process.…”