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Related Concept Videos

Production of Alcohol01:27

Production of Alcohol

Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...
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Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...

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Develop a novel method for removing fusel alcohols from rice spirits using nanofiltration.

Chang-Wei Hsieh1, Yi-Hsiang Huang, Cheng-Hung Lai

  • 1Dept. of Medicinal Botanicals and Health Care, Da-Yeh Univ., 168 Univ. Rd, Dacun, Changhua 51591, Taiwan, Republic of China.

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|May 25, 2010
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Nanofiltration (NF) effectively removed fusel alcohols from rice spirits, outperforming ultrafiltration (UF). Treated spirits showed improved sensory evaluation with minimal changes to key physicochemical properties.

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Area of Science:

  • Food Science and Technology
  • Separation Science
  • Chemical Engineering

Background:

  • Fusel alcohols are byproducts of fermentation that can negatively impact the flavor and aroma of distilled spirits.
  • Traditional methods for removing fusel alcohols often involve heat or lengthy processes, potentially altering the spirit's quality.
  • Membrane filtration offers a non-thermal alternative for purifying distilled beverages.

Purpose of the Study:

  • To investigate the efficacy of nanofiltration (NF) and ultrafiltration (UF) for removing excessive fusel alcohols from rice spirits.
  • To compare the performance of different NF and UF membranes in terms of fusel alcohol rejection.
  • To assess the impact of NF treatment on the physicochemical properties and sensory evaluation of rice spirits.

Main Methods:

  • Rice spirits were treated using nanofiltration (NF) membranes (DK and DL) and ultrafiltration (UF) membranes (GE and GH).
  • Fusel alcohol rejection rates were measured under varying operating pressures, with optimal conditions identified for the DK membrane.
  • Physicochemical indices (ethanol concentration, flavor, total acidity, pH, soluble solids) and sensory evaluations were conducted on treated and untreated rice spirits.

Main Results:

  • NF membranes demonstrated a significantly higher fusel alcohol rejection (10 times greater) compared to UF membranes, attributed to their lower molecular weight cut-off.
  • The DK membrane achieved a 44.2% rejection rate at an operating pressure of 488.95 kPa.
  • Rice spirits treated with NF showed only minor alterations in physicochemical properties and received higher scores in sensory evaluations.

Conclusions:

  • Nanofiltration is a highly effective non-thermal process for removing fusel alcohols from rice spirits.
  • The DK nanofiltration membrane shows practical applicability for improving the quality of rice spirits.
  • This study supports the potential for widespread application of NF technology in the distilled spirits industry.