Destani Fitim, Naccarato Attilio, Tagarelli Antonio, Cassano Alfredo
Institute on Membrane Technology, ITM-CNR, c/o University of Calabria, via Pietro Bucci, 17/C-87036 Rende (CS), Italy.
Department of Chemistry and Chemical Technologies, c/o University of Calabria, via Pietro Bucci, 12/C-87036 Rende (CS), Italy.
Membranes (Basel). 2020 May 8;10(5):92. doi: 10.3390/membranes10050092.
The aim of this work was to analyze the potential of reverse osmosis (RO) membranes in the recovery and concentration of aroma compounds from orange juice evaporator condensate (EC) streams. Concentration experiments were performed by using three RO spiral-wound aromatic polyamide membranes (SG1812C-34D, SC1812C-34D and SE1812) with different NaCl rejections. The effect of transmembrane pressure, axial feed flowrate and volume concentration ratio (VCR) on permeate flux was studied. Rejections of the investigated membranes towards specific aroma compounds (octanol, α-terpineol, terpinen-4-ol, cis-carveol, karvon, linalool) in selected operating conditions were also evaluated. The concentrations of the aroma compounds were determined by gas chromatography coupled with mass spectrometry (GC-MS) using headspace solid-phase microextraction (HS-SPME) as a sample preparation approach. For all selected membranes, the permeate flux increased linearly by increasing the operating pressure from 5 to 25 bar; on the other hand, the feed flowrate did not have any significant effect on the permeate flux. High retention values towards aroma compounds (>80%) were measured for all selected membranes. However, the SC membrane showed the highest rejection values (>96%) and the best correlation between concentration factor of aroma compounds and VCR.
这项工作的目的是分析反渗透（RO）膜从橙汁蒸发器冷凝液（EC）流中回收和浓缩香气化合物的潜力。使用三种具有不同氯化钠截留率的RO螺旋缠绕芳香族聚酰胺膜（SG1812C-34D、SC1812C-34D和SE1812）进行浓缩实验。研究了跨膜压力、轴向进料流速和体积浓缩比（VCR）对渗透通量的影响。还评估了所研究的膜在选定操作条件下对特定香气化合物（辛醇、α-松油醇、萜品-4-醇、顺式香芹醇、香芹酮、芳樟醇）的截留率。使用顶空固相微萃取（HS-SPME）作为样品制备方法，通过气相色谱-质谱联用（GC-MS）测定香气化合物的浓度。对于所有选定的膜，通过将操作压力从5巴提高到25巴，渗透通量呈线性增加；另一方面，进料流速对渗透通量没有任何显著影响。所有选定的膜对香气化合物的保留值都很高（>80%）。然而，SC膜显示出最高的截留值（>96%），并且香气化合物的浓缩因子与VCR之间的相关性最佳。
