Recovery of lactic acid from fermentation broth by the two-stage process of nanofiltration and water-splitting electrodialysis

2006 ◽  
Vol 11 (4) ◽  
pp. 313-318 ◽  
Author(s):  
Eun Gyo Lee ◽  
Sang Hyeon Kang ◽  
Hyun Han Kim ◽  
Yong Keun Chang
Keyword(s):  
Lactic Acid ◽  
Water Splitting ◽  
Fermentation Broth ◽  
Two Stage ◽  
Stage Process

Screw holding performance in WPC composites

2021 ◽  
Vol 113 ◽  
pp. 43-52
Author(s):  
Piotr Borysiuk ◽  
Alicja Auriga ◽  
Radosław Auriga
Keyword(s):  
Lactic Acid ◽  
Density Profile ◽  
Research Effort ◽  
Poly Lactic Acid ◽  
Two Stage ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Stage Process ◽  
The Impact

Screw holding performance in WPC composites. In this research effort, the impact of fillers’ composition on wood-plastic composites (WPC) made of poly (lactic acid) PLA was tested. The composites varied in filler type (bark, sawdust) and its content in the boards (40, 50, 60%). The composites were manufactured in a two-stage process consisting of extrusion and flat pressing. Analogically prepared HDPE boards were a reference. Composites were tested for density, density profile, and screw-holding ability. Boards based on PLA performed better screw-holding ability than HDPE. The greatest influence was exerted by the share of matrix/filler. An increase in the content of lignocellulosic particles from 40 to 60% (regardless of the type of matrix: PLA or HDPE) generally reduced screw-holding ability. The type of filler (sawdust, bark) was almost 3 times more important in the case of HDPE boards compared to PLA boards.

scholarly journals Alternative reverse osmosis to purify lactic acid from a fermentation broth

2018 ◽  
Vol 24 (2) ◽  
pp. 179-190
Author(s):  
Natnirin Phanthumchinda ◽  
Tanapawarin Rampai ◽  
Budsabathip Prasirtsak ◽  
Sitanan Thitiprasert ◽  
Somboon Tanasupawat ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reverse Osmosis ◽  
Fermentation Broth ◽  
Feed Solution ◽  
Sodium Lactate ◽  
Calcium Lactate ◽  
Operating Pressure ◽  
Two Stage ◽  
Ammonium Lactate ◽  
Monovalent Ions

Brackish water reverse osmosis (BWRO) and seawater reverse osmosis (SWRO) membranes were used in a two-stage reverse osmosis (RO) unit to recover, pre-purify, and pre-concentrate lactic acid. Calcium lactate, sodium lactate, and ammonium lactate were used as model feed solutions. The operating pressure showed a pronounced effect on lactate passage through the first BWRO unit, and the Donnan exclusion effect and hydrogen bonding were responsible for cation rejection. Calcium ions were rejected at the BWRO unit because of low diffusion rate and charge interaction at the surface. However, monovalent ions formed hydrogen bonds with the carbonyl group of the membrane that allowed passage across the membrane. The second SWRO unit was for pre-concentrating lactic acid. A high lactate purity of 99.2% with a total recovery of 50.5% was acquired from calcium lactate feed solution. Lower purity with higher lactate recovery was obtained when the feed solution was sodium lactate and ammonium lactate. When the actual fermentation broth was used in the two-stage RO unit, a slightly lower recovery and purity of lactic acid were obtained. It was claimed that the total ions present in the fermentation broth were responsible for the low efficiency of the two-stage RO unit.

scholarly journals Modern method of lactic acid recovery from fermentation broth

2011 ◽  
Vol 22 (No. 3) ◽  
pp. 87-94 ◽  
Author(s):  
V. Hábová ◽  
K. Melzoch ◽  
M. Rychtera
Keyword(s):  
Lactic Acid ◽  
Metal Ions ◽  
Total Energy ◽  
Water Splitting ◽  
Fermentation Broth ◽  
Modern Method ◽  
Second Step ◽  
Lactic Acid Concentration ◽  
Acid Recovery ◽  
Multivalent Metal

Electrodialysis was used for lactic acid recovery from fermentation broth. In the first step, lactate was recovered and concentrated by desalting electrodialysis, and the second step was electroconversion of lactate to lactic acid by water-splitting electrodialysis. The final lactic acid concentration of 151 g/l was obtained. Total energy required in both electrodialysis processes was about 1.5 kWh per 1 kg of lactic acid obtained. The fermentation broth had to be pretreated prior to the electrodialysis experiments. The pretreatment consisted of ultrafiltration, decolourisation, and the removal of multivalent metal ions.  

scholarly journals Two-Stage Biodiesel Synthesis from Used Cooking Oil with a High Acid Value via an Ultrasound-Assisted Method

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3703
Author(s):  
Ming-Chien Hsiao ◽  
Wei-Ting Lin ◽  
Wei-Cheng Chiu ◽  
Shuhn-Shyurng Hou
Keyword(s):  
Acid Value ◽  
Molar Ratio ◽  
Optimal Conditions ◽  
Two Stage ◽  
Cooking Oil ◽  
High Acid ◽  
Used Cooking Oil ◽  
Biodiesel Synthesis ◽  
Stage Process ◽  
Ultrasound Assisted

In this study, ultrasound was used to accelerate two-stage (esterification–transesterification) catalytic synthesis of biodiesel from used cooking oil, which originally had a high acid value (4.35 mg KOH/g). In the first stage, acid-catalyzed esterification reaction conditions were developed with a 9:1 methanol/oil molar ratio, sulfuric acid dosage at 2 wt %, and a reaction temperature of 60 °C. Under ultrasound irradiation for 40 min, the acid value was effectively decreased from 4.35 to 1.67 mg KOH/g, which was decreased to a sufficient level (<2 mg KOH/g) to avoid the saponification problem for the subsequent transesterification reaction. In the following stage, base-catalyzed transesterification reactions were carried out with a 12:1 methanol/oil molar ratio, a sodium hydroxide dosage of 1 wt %, and a reaction temperature of 65 °C. Under ultrasound-assisted transesterification for 40 min, the conversion rate of biodiesel reached 97.05%, which met the requirement of EN 14214 standard, i.e., 96.5% minimum. In order to evaluate and explore the improvement of the ultrasound-assisted two-stage (esterification–transesterification) process in shortening the reaction time, additional two-stage biodiesel synthesis experiments using the traditional mechanical stirring method under the optimal conditions were further carried out in this study. It was found that, under the same optimal conditions, using the ultrasound-assisted two-stage process, the total reaction time was significantly reduced to only 80 min, which was much shorter than the total time required by the conventional method of 140 min. It is worth noting that compared with the traditional method without ultrasound, the intensification of the ultrasound-assisted two-stage process significantly shortened the total time from 140 min to 80 min, which is a reduction of 42.9%. It was concluded that the ultrasound-assisted two-stage (esterification–transesterification) catalytic process is an effective and time-saving method for synthesizing biodiesel from used cooking oil with a high acid value.

Recent advances in the separation and purification of lactic acid from fermentation broth

2021 ◽  
Vol 104 ◽  
pp. 142-151
Author(s):  
Chenglong Li ◽  
Ming Gao ◽  
Wenbin Zhu ◽  
Nuohan Wang ◽  
Xiaoyu Ma ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Fermentation Broth ◽  
Separation And Purification ◽  
Recent Advances
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