Ammonium Ionic Liquids for Low-Temperature Biomass Pretreatment

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Solution Overview

Problem

Current biomass pretreatment methods for converting lignocellulosic biomass into fermentable sugars are energy-intensive and costly, often requiring high temperatures and pressures, and existing ionic liquids are expensive and inefficient at lower temperatures.

Innovation Solution

A method using a pre-treatment mixture of at least 5% biomass with 40% ionic liquid, comprising a quaternary ammonium cation and specific anions, at temperatures between 20°C and 100°C to dissolve polysaccharides and remove lignin, followed by saccharification with glycoside hydrolases to produce sugar compositions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional pretreatment methods using concentrated or dilute acids and bases are employed, then high fermentable sugar yields are achieved, but severe process conditions (120-200°C) are required which increase energy consumption and production costs

Engineering Contradiction:

Improvefermentable sugar yieldVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent changes the chemical parameters by using ionic liquids with specific cation-anion combinations (e.g., choline chloride with organic acids) instead of conventional acids and bases. This allows the pretreatment to proceed at lower temperatures (40-80°C) while maintaining effective delignification and cellulose exposure, thereby reducing energy consumption without sacrificing sugar yield

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite ionic liquid systems combining specific cations (choline, ammonium, phosphonium) with tailored anions (organic acids, carboxylic acids) to create pretreatment agents that operate effectively at lower temperatures. These composite chemical systems provide both delignification capability and cellulose accessibility enhancement under milder conditions

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If existing ionic liquids are used for biomass pretreatment, then dissolution of polysaccharides is achieved, but the ionic liquids are expensive and inefficient at lower temperatures

Engineering Contradiction:

Improvepolysaccharide dissolutionVSAvoidoperating temperature

Core Design Contradiction:

Stability of the object's compositionVSTemperature

Solution Approach 1:

The patent modifies the ionic liquid composition by selecting specific cation-anion pairs (choline chloride with formic acid, acetic acid, propionic acid, or butyric acid) that exhibit optimal dissolution performance at lower temperatures (40-80°C). The parameter optimization includes adjusting the molar ratios and selecting anions with appropriate chain lengths to enhance polysaccharide solubility at reduced thermal energy input

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs biodegradable choline-based ionic liquids that are more cost-effective and environmentally friendly compared to traditional imidazolium-based ionic liquids. These cheaper ionic liquid systems can be used at lower temperatures with effective polysaccharide dissolution, reducing both material and energy costs

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If higher temperature process technologies are used, then pretreatment effectiveness is improved, but production costs increase due to higher energy requirements

Engineering Contradiction:

Improvepretreatment effectivenessVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the temperature parameter from conventional high-temperature ranges (120-200°C) to a lower range (40-80°C) by using specifically designed ionic liquid pretreatment agents. This parameter shift maintains pretreatment effectiveness through enhanced chemical interaction between the ionic liquid components and biomass constituents, while significantly reducing energy consumption and production costs

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This method reduces energy requirements, lowers production costs, and efficiently converts biomass into sugar compositions at lower temperatures, enhancing the efficiency of biomass conversion processes.

Implementation Method 1

Certain ionic liquids (ILs) are able to dissolve either lignocellulosic materials or one of its main constituents such as cellulose, hemicellulose, or lignin

Methodology Applied

Scientific EffectSolvation: Solvation