Investigation of spiral-wound membrane modules for the cross-flow nanofiltration of fermentation broth obtained from a pilot plant fermentation reactor for the continuous production of lactic acid

Cross flow filtration is the typical way that water is filtered in membrane technology; that means that feed solution passes tangencially over the membrane and rejected components are washed away of the membrane by the rejected stream. In such a way, that minimal solids building up and at constant low flow resistance are achieved. In this paper, a calulation method regarding to the value of cross-section active area for a polymeric spiral wound reverse osmosis (RO) membrane is presented, in order to obtain the value of the cross-flow velocity of the system. This velocity is needed to improve the knowledge fouling mechanisms and it is not easy to know without obtaining the cross section area. To determine cross-section area of a RO polymeric spiral wound membrane a series of calculations were performed to obtain the initial values of some parameters. The mathematical calculation was also achieved with the Roll Length program. Based on the results obtained, it was concluded that only 65.36% of the total cross-section of the membrane is useful to cross flow and it was possible to determine the active cross-section of filtration with a value of 1,915.4 mm2, for the membrane studied. This methodology allows the calculation for any RO spiral membrane.

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An Improved Model for Cross-Flow Microfiltration Properties of Lactic Acid Fermentation Broth

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN ◽

10.1252/jcej.10we177 ◽

2010 ◽

Vol 43 (12) ◽

pp. 993-997 ◽

Cited By ~ 6

Author(s):

Fitriani ◽

Yoshiyuki Yamashita ◽

Takao Kokugan

Keyword(s):

Lactic Acid ◽

Fermentation Broth ◽

Cross Flow ◽

Lactic Acid Fermentation ◽

Acid Fermentation ◽

Improved Model

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Analysis and Simulation of Cross-Flow Reactor for Ethylene Epoxidation

Chemical Product and Process Modeling ◽

10.2202/1934-2659.1015 ◽

2007 ◽

Vol 2 (1) ◽

Author(s):

Khalid Ibrahem Alhumaizi ◽

Abdulaziz Abahussain

Keyword(s):

Pilot Plant ◽

Flow Reactor ◽

Fixed Bed ◽

Cross Flow ◽

Fixed Bed Reactor ◽

Feed Ratio ◽

Low Oxygen ◽

Feeding Mode ◽

Ethylene Epoxidation ◽

The Cross

A steady-state cross-flow reactor for ethylene epoxidation was simulated using industrial data (low oxygen/ethylene feed ratio) and pilot plant data (high oxygen/ethylene feed ratio). A comparison between the conventional fixed-bed reactor and the cross-flow reactor with two types of feeding modes was performed. The present study showed the possibility of enhancing the reactor yield by distributing the ethylene optimally at equal spaced along the reactor for both commercial and pilot plant cases. We have shown that the evenly distributed feeding mode does not increase the desired ethylene oxide yield. The model results confirmed that the cross-flow reactor with ethylene is the best configuration, followed by the conventional fixed-bed reactor and the cross-flow reactor with oxygen, respectively.

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