Cellulose Solubilization via High-Temperature Low-Pressure Hydrolysis
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Solution Overview
Problem
Current methods for solubilizing cellulose, such as hydrothermal treatment, generate excessive byproducts like lactic acid, acetic acid, or hydroxymethylfurfural, and require high pressures or chemicals, which are environmentally harmful and costly.
Innovation Solution
A method involving reacting cellulose with water at high temperatures (100° C. to 300° C.) and low pressures (0.05 MPa to 10 MPa) without catalysts, where the reaction occurs in a high temperature-low pressure region, promoting hydrolysis while minimizing excessive decomposition products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrothermal treatment with pressurized hot water is used to solubilize cellulose rapidly, then solubilization speed is improved, but excessively decomposed products such as lactic acid, acetic acid, and HMF are generated in large amounts
Solution Approach 1:
The patent changes the reaction parameters from high temperature-high pressure (hydrothermal treatment) to high temperature-low pressure conditions. Specifically, it uses water at temperatures of 100°C or higher but maintains pressure below the saturated vapor pressure at that temperature, preventing the formation of pressurized hot water while still achieving rapid solubilization with minimal decomposition products.
Solution Approach 2:
The patent inverts the conventional approach by using low pressure instead of high pressure to achieve rapid solubilization. While conventional hydrothermal treatment relies on high pressure to maintain water in liquid state at high temperatures, this patent achieves similar or better results by operating at low pressure conditions where water can still effectively hydrolyze cellulose without causing excessive decomposition.
2Productivity
If strong liquid acid is used to hydrolyze cellulose into sugar, then hydrolysis efficiency is improved, but apparatus corrosion and large amount of gypsum waste are generated
Solution Approach 1:
The patent uses water itself as the hydrolyzing agent under high temperature-low pressure conditions, eliminating the need for external chemical catalysts like strong acids. The water molecules directly facilitate the hydrolysis of cellulose into soluble sugars without requiring additional chemical inputs that would cause corrosion or waste generation.
Solution Approach 2:
The patent replaces the chemical mechanism (strong acid hydrolysis) with a physical-chemical mechanism (high temperature water treatment at low pressure). This substitution eliminates the harmful effects of strong acids while maintaining effective hydrolysis capability through controlled thermal and pressure conditions.
3Productivity
If high pressure is applied to maintain water in liquid state at high temperature, then hydrolysis reaction is promoted, but equipment complexity and operational difficulty increase
Solution Approach 1:
The patent inverts the pressure approach by using low pressure instead of high pressure to achieve effective cellulose solubilization. This simplifies the equipment requirements as it does not need high-pressure vessels or specialized high-pressure safety systems, while still maintaining water in a reactive state through high temperature control.
Solution Approach 2:
The patent changes the pressure parameter from high to low while maintaining high temperature, creating a novel reaction condition that simplifies equipment design. By operating below the saturated vapor pressure at the given temperature, the system avoids the complexities of high-pressure equipment while achieving rapid and selective cellulose hydrolysis.
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 approach allows for rapid cellulose solubilization with significantly reduced production of excessive byproducts, simplifies equipment design, and lowers environmental impact by avoiding chemical use and high pressures.
Implementation Method 1
a raw material containing cellulose is reacted with water for conversion into a water soluble component
Implementation Method 2
as ionic product is increased, the pressurized hot water can promote the hydrolysis reaction of cellulose
Data Source
AI summary
Provided is a method for solubilizing cellulose in which cellulose can be solubilized in a short period of time with a low amount of excess decomposition and without the use of a catalyst or other chemicals. A starting material containing cellulose is pulverized to reduce the crystallization thereof, adjusted for moisture content, reacted with water in the absence of a catalyst, and converted into a water-soluble component. At this point, the reaction is performed at a temperature of 100° C. or more and less than 300° C., and a total pressure of 0.05 MPa or more and less than 10 MPa. Water is added and extracted from the water soluble component, and solid-liquid separation is performed to separate the solids and the aqueous solution.