Purification and concentration of gluconic acid from an integrated fermentation and membrane process using response surface optimized conditions
Parimal Pal1(), Ramesh Kumar2, Subhamay Banerjee1
1. Environment and Membrane Technology Laboratory, Chemical Engineering Department, National Institute of Technology Durgapur, West Bengal 713209, India 2. Department of Chemistry, The University of Burdwan, West Bengal 713104, India
A response surface method was used to optimize the purification and concentration of gluconic acid from fermentation broth using an integrated membrane system. Gluconobacter oxydans was used for the bioconversion of the glucose in sugarcane juice to gluconic acid (concentration 45 g∙L−1) with a yield of 0.9 g∙g−1. The optimum operating conditions, such as trans-membrane pressure (TMP), pH, cross-flow rate (CFR) and initial gluconic acid concentration, were determined using response surface methodology. Five different types of polyamide nanofiltration membranes were screened and the best performing one was then used for downstream purification of gluconic acid in a flat sheet cross-flow membrane module. Under the optimum conditions (TMP= 12 bar and CFR= 400 L∙h−1), this membrane retained more than 85% of the unconverted glucose from the fermentation broth and had a gluconic acid permeation rate of 88% with a flux of 161 L∙m−2∙h−1. Using response surface methods to optimize this green nanofiltration process is an effective way of controlling the production of gluconic acid so that an efficient separation with high flux is obtained.
. [J]. Frontiers of Chemical Science and Engineering, 2019, 13(1): 152-163.
Parimal Pal, Ramesh Kumar, Subhamay Banerjee. Purification and concentration of gluconic acid from an integrated fermentation and membrane process using response surface optimized conditions. Front. Chem. Sci. Eng., 2019, 13(1): 152-163.
Indirect acid form (i.e. in salt form like Na/K gluconate)
Nature of feed
Renewable carbon source is used
Only pure glucose is used
Modular design
Flexible and may be changed according to need
Fixed and hard to change
Operating units
Fewer in number
Higher in number
Plant capacity
Adjustable according to need
Fixed, unchangeable
Energy requirement
Low due to no phase changes
High, due to multiphase (solid, liquid and gas) operations
Environmental issues
Minimum, due to no byproducts
High, due to excess salt production like calcium sulfate
Waste generation
No harmful waste, due to no pre- or post-treatment
Harmful waste generated, due to pre- or post-treatment
Use of acid or base
Minimal use
used in large amounts
Use of heat
Not used
Operational units can use or generate heat
Cost
Low due to need for fewer operating units
High due to need for more units
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