Silicalite-1 filled polydimethylsiloxane (PDMS) membranes (Silicalite-1/PDMS) were prepared by coating method, and used for separating volatile aromatic compounds from black tea by pervaporation (PV). The pervaporation performance of Silicalite-1/PDMS membrane was investigated in ethanol-water system. The results showed that Silicalite-1 could decrease ethanol flux, while improved separation remarkably. Silicalite-1/PDMS membrane was then applied in pervaporation separation of methyl salicylate, linalool and benzaldehyde, which are characteristic aroma components in black tea. The results showed that Silicalite-1/PDMS hybrid membrane which contained 5% (mass) Silicalite-1 displayed significant improvement in permeable flux and separation factor than PDMS/PVDF membrane. When using Silicalite-1/PDMS membrane to replace PDMS/PVDF membrane for separation at 50 ℃ and the flow rate of 0.32 L/min for 5 h, the flux of methyl salicylate, linalool and benzaldehyde increased by 50.50%, 176.10% and 197.90% respectively, and the separation factor increased by 23.50%, 17.80% and 62.70%, respectively. In addition, the performance of Silicalite-1/PDMS membrane in separating and enriching volatile aroma components in actual black tea was tested. When the experiment was conducted at 50 °C and the flow rate was 0.32 L/min for 5 h, the recovery rates of methyl salicylate, benzaldehyde and linalool were 96.67%, 86.42% and 84.91% respectively. The result showed that Silicalite-1/PDMS membrane had a better performance.
ZHANG Jing-han
,
NI Fang
,
YU Jun-ya
,
YAO Zhong
,
SHAO Zeng-lang
,
SUN Yun
,
ZHU Ben-wei
,
ZHONG Liang
. Preparation of Silicalite-1/PDMS membrane and its application in separating characteristic aroma in black tea[J]. Food and Fermentation Industries, 2018
, 44(9)
: 84
-90
.
DOI: 10.13995/j.cnki.11-1802/ts.016192
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