Bamboo Fluff Pulp Preparation via Alkaline Extraction and Screening
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Solution Overview
Problem
The challenge is to prepare high-quality fluff pulp from bamboo resources, which requires long fiber length, low fine fiber content, low extractive and ash content, high bulk, and excellent water absorption performance, while also addressing the high hemicellulose and ash content in bamboo fibers.
Innovation Solution
A method involving alkaline extraction using a high concentration sodium hydroxide solution to remove hemicellulose and reduce ash content, followed by kraft cooking, screening to remove fine fibers and parenchyma cells, oxygen delignification, and ECF bleaching to produce high-performance bamboo fluff pulp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bamboo fibers are used directly for fluff pulp production, then abundant raw materials and short growth cycle are available, but high hemicellulose and ash content reduce water absorption performance
Solution Approach 1:
The patent applies preliminary alkaline extraction treatment to bamboo fibers before pulping to remove hemicellulose and ash. This preliminary action reduces the harmful content in the raw material, ensuring that the final fluff pulp achieves high water absorption volume without being hindered by excessive hemicellulose and ash content.
Solution Approach 2:
The patent changes the chemical composition parameters of bamboo fibers through controlled alkaline extraction. By adjusting extraction conditions (concentration, temperature, time), the hemicellulose and ash content are reduced to optimal levels, transforming the raw material properties to meet fluff pulp requirements while preserving fiber integrity.
2Length of moving object
If conventional pulping methods are used on bamboo, then processing is simplified, but fiber length is reduced and fine fiber content increases
Solution Approach 1:
The patent performs preliminary alkaline extraction to weaken hemicellulose bonds between fibers before the main pulping process. This preliminary action reduces the energy and chemical intensity needed during subsequent pulping, allowing gentler processing that preserves fiber length while still achieving effective separation.
Solution Approach 2:
The patent optimizes pulping parameters (temperature, time, chemical concentration) based on the pre-treated bamboo state. The modified parameter set accounts for the reduced hemicellulose content, enabling effective fiber separation at lower intensities that prevent fiber degradation and minimize fine fiber generation.
3Object-affected harmful factors
If high concentration alkali solution is used for extraction, then hemicellulose removal is improved, but processing cost and chemical consumption increase
Solution Approach 1:
The patent employs periodic batch extraction cycles rather than continuous high-concentration treatment. Multiple extraction stages with varying alkali concentrations are performed sequentially, allowing hemicellulose removal to proceed efficiently while reducing the total chemical inventory needed at any one time and enabling better chemical recovery.
Solution Approach 2:
The patent optimizes alkali concentration, temperature, and extraction time parameters to achieve maximum hemicellulose removal efficiency at minimum chemical consumption. By finding the optimal parameter combination, the process achieves effective extraction without requiring excessively high chemical doses, reducing both cost and environmental impact.
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 method achieves bamboo fluff pulp with longer fiber length, lower fine fiber content, reduced extractive and ash content, higher bulk, and improved water absorption performance, while also enabling the comprehensive utilization of hemicellulose and recycling of coarse rejects and fine fibers for packaging paper.
Implementation Method 1
a high concentration sodium hydroxide solution is used to perform alkaline extraction on the bamboo raw materials
Implementation Method 2
the kraft process is used for cooking
Implementation Method 3
oxygen delignification and ECF bleaching are performed to completely remove lignin from the raw materials
Implementation Method 4
oxygen delignification and ECF bleaching are performed to completely remove lignin from the raw materials, improve the hydrophilicity and water absorption value of the fibers
Data Source
AI summary
Discloses are a method for preparing fluff pulp from bamboos, and the fluff pulp prepared thereby. The method comprises the following steps: treating the bamboos with high-concentration alkali at a relatively mild temperature, after a certain period of treatment, replacing a treatment liquid for separating hemicellulose with a weak black liquor; Kraft cooking the treated bamboos to obtain unbleached bamboo pulp, removing rejects in the unbleached bamboo pulp by using a slotted screen; then removing miscellaneous cells by using a microporous sieve; carrying out two stages of oxygen delignification on the screened pulp; carrying out ECF bleaching treatment of a D0EpD1P process; and finally obtaining the bamboo fluff pulp which has high whiteness, low DCM extract content, low ash content and long fiber length, contains 4.2-4.6 million fibers per gram, and has relatively high bulkiness.