Ion Exchange as a Separations Method. VII. Near Optimum Conditions for the Separation of Fission Product Rare Earths with Lactic Acid Eluant at 87°

1954 ◽  
Vol 76 (4) ◽  
pp. 1021-1022 ◽  
Author(s):  
Edward C. Freiling ◽  
Leland R. Bunney
Keyword(s):  
Lactic Acid ◽  
Ion Exchange ◽  
Fission Product ◽  
Rare Earths ◽  
Optimum Conditions

scholarly journals Statistical Optimization of Alkali Pretreatment to Improve Sugars Recovery from Spent Coffee Grounds and Utilization in Lactic Acid Fermentation

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 494 ◽  
Author(s):  
Kang Hyun Lee ◽  
Ye Won Jang ◽  
Jeongho Lee ◽  
Seunghee Kim ◽  
Chulhwan Park ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Enzymatic Hydrolysis ◽  
Lactic Acid Production ◽  
Complex Loading ◽  
Lactic Acid Fermentation ◽  
Optimum Conditions ◽  
Spent Coffee Grounds ◽  
Alkali Pretreatment ◽  
Acid Fermentation ◽  
Coffee Grounds

Biorefinery, which utilizes carbon-neutral biomass as a resource, is attracting attention as a significant alternative in a modern society confronted with climate change. In this study, spent coffee grounds (SCGs) were used as the feedstock for lactic acid fermentation. In order to improve sugar conversion, alkali pretreatment was optimized by a statistical method, namely response surface methodology (RSM). The optimum conditions for the alkali pretreatment of SCGs were determined as follows: 75 °C, 3% potassium hydroxide (KOH) and a time of 2.8 h. The optimum conditions for enzymatic hydrolysis of pretreated SCGs were determined as follows: enzyme complex loading of 30-unit cellulase, 15-unit cellobiase and 50-unit mannanase per g biomass and a reaction time of 96 h. SCG hydrolysates were used as the carbon source for Lactobacillus cultivation, and the conversions of lactic acid by L. brevis ATCC 8287 and L. parabuchneri ATCC 49374 were 40.1% and 55.8%, respectively. Finally, the maximum lactic acid production by L. parabuchneri ATCC 49374 was estimated to be 101.2 g based on 1000 g of SCGs through the optimization of alkali pretreatment and enzymatic hydrolysis.

Kinetic Study of Esterification of Lactic Acid with Isobutanol and n-Butanol Catalyzed by Ion-exchange Resins

2009 ◽  
Vol 17 (5) ◽  
pp. 773-780 ◽  
Author(s):  
Yixin QU ◽  
Shaojun PENG ◽  
Shui WANG ◽  
Zhiqiang ZHANG ◽  
Jidong WANG
Keyword(s):  
Lactic Acid ◽  
Ion Exchange ◽  
Kinetic Study ◽  
Ion Exchange Resins ◽  
Exchange Resins
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