Performance of spiral-wound membrane modules in organic solvent nanofiltration – Fluid dynamics and mass transfer characteristics

Abstract

AAM can deposited in Spiral subject to a 12 month embargo. Will be published with a CC-BY license soon

Multi-scale modelling of OSN batch concentration with spiral-wound membrane modules using OSN Designer

“…Equation (2) The concentration of sucrose octaacetate was determined using a gas chromatograph with a flame ionisation detector and a fused silica column (Rtx® -2887 column purchased from Thames Restek Limited, UK) [Shi et al, 2015]. The temperature programme ran from 40 to 300 °C at a rate of 15 °C min -1 , and then remained at 300 °C for 10 min.…”

“…Estimate system with the Dortmund modified UNIFAC (UNIF-DMD) as a base method in the Aspen Plus V7.3 environment [Shi et al, 2015]. A mathematical model for the batch concentration operation considering the gradients of concentration, pressure and velocity through the module, the concentration polarisation and the thermodynamic non-ideality of the solutions was programmed in MATLAB, which communicates with Aspen Plus via the CAPE OPEN interface, as shown in Figure 2.…”

“…Furthermore, the fluid dynamics and mass transfer characteristics are dependent on the spacer geometry which is usually confidential in commercial modules, and unknown for end users. Recently, Shi et al [Shi et al, 2015] proposed a procedure to generate correlations for characterising the fluid dynamics and mass transfer characteristics in spiral-wound membrane modules. Specifically, three correlations for describing the friction coefficients in both the feed and permeate channels and the Sherwood number in the feed channel for OSN applications were proposed.…”

“…This was due to the fact that they used empirical, non-predictive membrane transport models, which assume constant flux and rejection over time. This has been shown to be unrealistic in many cases [Shi et al, 2015;Peeva et al, 2004].…”

“…The model was implemented via the "OSN Designer" software tool [Peshev and Livingston, 2013]. The membrane transport model parameters as well as all parameters in the pressure drop and mass transfer correlations for the spiral-wound modules were obtained from regression on a limited number of experimental data obtained at steady state conditions [Shi et al, 2015] and used to simulate the performance of a batch concentration process. This study discusses the potential of this approach to predict the performance of any OSN process which uses spiral-wound membrane modules, based on simple flat sheet test data.…”