Influences of Technological Parameters on Cross-Flow Nanofiltration of Cranberry Juice

Abstract

The paper focused on the influence of operative conditions on the separation of benzoic acid from 10 °Brix cranberry juice by cross-flow nanofiltration with a plate and frame pilot scale (DDS Lab Module Type 20 system). Six kinds of commercial nanofiltration membrane were investigated. The results showed that the rejection of benzoic acid was significantly lower than that of other components in cranberry juice, including sugars and other organic acids. In a range of 2–7.5 L/min, feed flow rate slightly affected the performance of nanofiltration. Higher temperatures resulted in higher permeate flux and lower rejection of benzoic acid, whereas rejection of sugar and organic acid was stable at a high value. In a range of 2.5–5.5, pH also significantly affected the separation of benzoic acid and negative rejection against benzoic acid was observed at pH 4.5 with some of the membranes. This implies that pH 4.5 is considered as an optimum pH for benzoic acid separation from cranberry juice. The lower permeate flux caused a lower rejection of benzoic acid and negative rejection of benzoic acid was observed at the low permeate flux. Pretreatment by ultrafiltration with CR61PP membranes could improve the permeate flux but insignificantly influenced the efficiency of separation. The results also indicated that NF99 and DK membranes can be effectively used to separate benzoic acid from cranberry juice.

Effect of pressure and cross-flow velocity on membrane behaviour in red wine nanofiltration

“…The dependence between cumulative permeated volume and time is linear with high correlation coefficient (𝑅𝑅 2 > 0.99 for all the 14 experimental runs in the abovementioned pressure and cross-flow rate ranges). For both selected membranes the observed average permeate flux increases linearly by increasing the operating pressure in the range of 20-40 bar: 𝐽𝐽 = 0.0527 × 𝑇𝑇𝑇𝑇𝑇𝑇, 𝑅𝑅 2 = 0.981 for Nadir® NP030 P and 𝐽𝐽 = 0.7861 × 𝑇𝑇𝑇𝑇𝑇𝑇 + 8.5708, 𝑅𝑅 2 = 0.985 for NF99HF membrane -a fact reported for these membranes [2,14]. The observed decrease in the permeate flux at 50 bar can be explained by membrane compression and fouling (including concentration polarization and cake layer resistance).…”

Technical assessment of nanofiltration process for concentration of cranberry juice and recovery of benzoic acid

“…This was because an increase in concentration promoted diffusion, meanwhile decreasing the transmembrane pressure, thereby lowering the convection. On the whole, the higher content of soluble solids and the lower permeate flux caused the lower rejection (Bouchoux et al ., 2005; Giacobbo et al ., 2018; Lai et al ., 2021).…”

“…From the previous studies, the conditions were selected as follows: the nanofiltration of cranberry juice was operated as concentration mode with total recirculation of retentate under the conditions as follows: feed flow rate: 6 L/min, operating temperature: 25 °C, operating pressure: 4 MPa (Lai et al ., 2012, 2021).…”

“…Previous research evaluated the separation of benzoic acid in cranberry juice using different kinds of commercial nanofiltration membranes from dead‐end bench to cross‐flow pilot scale equipment under various operating conditions. The impact of operating conditions and UF pretreatment on cranberry juice NF was investigated in total recirculation mode (Lai et al ., 2012, 2021). In this study, the effects of UF pretreatment on cranberry juice NF were also investigated to improve the filtration process under concentration mode (total recirculation of retentate).…”

A New Ultrafiltration-Based Process for Green Recovery of Polyphenols from Rose Petal By-Product

“…The feed flow rate led to an increase in the permeate flux. According to Lai et al in 2021 [19], the cross-flow velocity rise led to a decrease in the concentration polarization on the membrane surface and an increase in the permeate flux. The same authors also improved that the permeate flux rise differed according to the membrane's material.…”