Acacia crassicarpa Dissolving Pulp Production via Pre-hydrolysis Kraft Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of dissolving pulp from alternative hardwood species has been limited due to difficulties in reducing silica content and managing lipophilic extractives, which affect the pulping process and quality of the pulp, making it challenging to meet stringent industrial requirements.
Innovation Solution
The use of Acacia crassicarpa as a raw material for producing dissolving pulp, which has a low lipophilic content, allowing for the production of pulp with high alpha cellulose content and improved operability, through a pre-hydrolysis Kraft process that includes hydrolysis and alkaline treatment to degrade hemicelluloses and lignin, resulting in a pulp suitable for viscose fiber production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If alternative hardwood species are used to produce dissolving pulp, then material availability and cost are improved, but the lipophilic extractives content increases making it difficult to meet industrial requirements
Solution Approach 1:
The patent applies extraction by selecting Acacia crassicarpa wood chips as the raw material, which naturally contains low levels of lipophilic extractives (0.03-0.20 wt%). This extraction principle works at the material selection stage rather than requiring post-processing removal, thereby achieving both availability and quality requirements simultaneously
Solution Approach 2:
The patent changes the key parameter of lipophilic extractives content by selecting a specific wood species (Acacia crassicarpa) with inherently low extractive content (0.03-0.20 wt%). This parameter change at the raw material level enables the pulp to meet stringent industrial specifications without requiring additional extraction processes
2Quantity of substance
If alternative hardwood species are used to produce dissolving pulp, then material availability is improved, but the silica content increases making it difficult to meet industrial requirements
Solution Approach 1:
The patent applies extraction by selecting Acacia crassicarpa wood chips as the raw material, which naturally contains low levels of silica (0.01-0.05 wt%). This extraction principle works at the material selection stage rather than requiring post-processing removal, thereby achieving both availability and quality requirements simultaneously
Solution Approach 2:
The patent changes the key parameter of silica content by selecting a specific wood species (Acacia crassicarpa) with inherently low silica content (0.01-0.05 wt%). This parameter change at the raw material level enables the pulp to meet stringent industrial specifications without requiring additional removal processes
3Ease of manufacture
If conventional hardwood species are used to produce dissolving pulp, then the pulping process is well-established, but the lipophilic extractives content is high requiring extensive treatment
Solution Approach 1:
The patent changes the key parameter of lipophilic extractives content by selecting Acacia crassicarpa wood chips with inherently low extractive content (0.03-0.20 wt%). This parameter change at the raw material level eliminates the need for extensive extractive removal treatments while maintaining ease of manufacture through conventional pulping processes
Solution Approach 2:
The patent applies extraction by selecting Acacia crassicarpa wood chips as the raw material, which naturally contains low levels of lipophilic extractives. This extraction principle works at the material selection stage rather than requiring post-processing removal, thereby achieving both availability and quality requirements simultaneously
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
Acacia crassicarpa-based dissolving pulp meets commercial specifications with high alpha cellulose content and low lipophilic extractives, enhancing the yield and quality of the pulp, and facilitating the production of strong, uniform viscose fibers.
Implementation Method 1
hydrolysing a composition comprising cellulosic or a lignocellulosic material consisting of Acacia crassicarpa to thereby form a treated cellulosic or lignocellulosic composition
Implementation Method 2
heating the treated composition under conditions to produce said dissolving pulp
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
There is provided a dissolving pulp, a cellulosic composition, a composition, regenerated cellulose fibre and a textile comprising Acacia crassicarpa. There is provided the use of the compositions for preparing a dissolving pulp. There is provided a method of preparing dissolving pulp, comprising: (a) hydrolysing a composition comprising cellulosic or a lignocellulosic material of Acacia crassicarpa to thereby form a treated cellulosic or lignocellulosic composition; (b) heating the treated composition under conditions to produce said dissolving pulp; and a method of producing regenerated cellulose fibres, comprising: (a) base treatment of a dissolving pulp of Acacia crassicarpa to produce cellulose xanthate; (b) neutralizing said cellulose xanthate to produce said regenerated cellulose fibres.