Onium Salt Cellulose Dissolution at Low Temperatures
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Solution Overview
Problem
Conventional onium salts do not effectively dissolve cellulose at temperatures of 100° C or lower, limiting their utility in cellulose recovery processes.
Innovation Solution
Development of a specific onium salt represented by Formula (1), which includes various hydrocarbon groups and onium cations, and its use in a liquid composition with cellulose, along with organic solvents like N,N-dimethylacetamide, dimethyl sulfoxide, or N,N-dimethylformamide, to enhance cellulose solubility and facilitate efficient recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional onium salts are used to dissolve cellulose, then the process can proceed at lower temperatures, but the solubility of cellulose is insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of the onium salt by introducing specific substituents (R1-R6 representing various hydrocarbon groups) at different positions of the onium cation core structure. This structural parameter change enables the salt to dissolve cellulose effectively at lower temperatures while maintaining high solubility, resolving the contradiction between temperature and solubility.
Solution Approach 2:
The invention creates a composite solvent system by combining the specially structured onium salt with cellulose, forming a cellulose-containing onium salt composition. This composite approach enhances the solubility properties of the system, allowing effective cellulose dissolution at reduced temperatures compared to conventional onium salts.
2Productivity
If conventional onium salts are used for cellulose recovery, then the process is simpler, but the efficiency of cellulose dissolution and recovery is low
Solution Approach 1:
By optimizing the structural parameters of the onium salt (substituent types, positions, and configurations), the patent achieves significantly improved cellulose recovery efficiency. The modified structure enables better interaction with cellulose chains, enhancing both dissolution and subsequent recovery processes despite the increased structural complexity.
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
The new onium salt achieves high cellulose solubility at temperatures of 100° C or lower, enabling efficient cellulose recovery and recycling by dissolving and precipitating cellulose effectively.
Implementation Method 1
an onium salt having an extremely high ability to dissolve cellulose at temperatures of 100° C. or lower
Implementation Method 2
a method for recovering cellulose efficiently by using such a liquid composition containing the onium salt and cellulose
Data Source
AI summary
The invention relates to an onium salt, a liquid composition containing the onium salt and cellulose, and a method for recovering cellulose. The invention makes it possible to provide an onium salt having an extremely high ability to dissolve cellulose at temperatures of 100° C. or lower. It also makes it possible to provide a liquid composition containing this onium salt and cellulose, as a composition suitable for the recovery of cellulose, and a method for recovering cellulose efficiently by using such a liquid composition containing the onium salt and cellulose.