Related Experiment Video
Updated: Jun 20, 2026
10:42
Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
Dilute acid and autohydrolysis pretreatment.
1Center for Environmental Research and Technology, Bourns College of Engineering, University of California, Riverside, CA, USA.
Methods in Molecular Biology (Clifton, N.J.)
|September 22, 2009
Summary
Pretreating cellulosic biomass with heat and dilute sulfuric acid significantly enhances glucose yields from cellulose. This method also improves hemicellulose sugar recovery, making it a more efficient biofuel precursor process.
Area of Science:
- Biomass Pretreatment
- Renewable Energy
- Biochemical Engineering
Background:
- Cellulosic biomass is a key renewable resource for biofuel production.
- Efficient conversion of biomass to sugars is crucial for economic viability.
- Hemicellulose removal and cellulose enrichment are critical pretreatment goals.
Purpose of the Study:
- To investigate the effectiveness of thermal pretreatment with dilute sulfuric acid on cellulosic biomass.
- To optimize conditions for high glucose yields and hemicellulose sugar recovery.
- To evaluate different reactor configurations for biomass pretreatment.
Main Methods:
- Exposure of cellulosic biomass to temperatures of 120-210°C.
- Utilizing dilute sulfuric acid in the pretreatment process.
- Employing small-diameter tubes, mixed reactors, and steam injection systems for pretreatment.
Main Results:
- Temperatures of 120-210°C effectively remove hemicellulose, yielding cellulose-rich solids.
- Dilute sulfuric acid increased hemicellulose sugar recovery to 85-95%.
- Small-diameter tubes allowed high solids concentrations and accurate material balances.
Conclusions:
- Thermal pretreatment with dilute sulfuric acid is effective for biomass deconstruction.
- Optimized pretreatment conditions enhance glucose yields and sugar recovery.
- Different reactor types offer varying advantages for biomass pretreatment scale and kinetic studies.
More Related Videos
Related Concept Videos
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
01:28Amides to Carboxylic Acids: Hydrolysis
Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
01:19Preparation of Carboxylic Acids: Hydrolysis of Nitriles
Nitriles (R–CN) can be converted into carboxylic acids (R–COOH) upon treatment with aqueous acids, i.e., upon hydrolysis of nitriles. Under base-catalyzed conditions, carboxylate anions (R–COO−) are formed.
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
01:08Nitriles to Carboxylic Acids: Hydrolysis
Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.