Hydrolysis Apparatus Moisture Control for Corrosion Management
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Solution Overview
Problem
The challenge in the saccharides extraction process from lignocellulosic materials is the high corrosion rate of low-quality steel materials used in hydrolysis apparatuses, which limits their industrial application due to the corrosive nature of acidic water solutions at high temperatures, and there is a need to determine when it is safe to introduce lignocellulosic materials into these apparatuses without causing unacceptable corrosion.
Innovation Solution
A method that involves measuring the moisture content of a dewatered mixture of lignocellulosic material and fluid, comparing it to a predefined value (e.g., 70%), and preventing the mixture from entering the apparatus if it exceeds this value, allowing the use of low-quality steel materials by ensuring they do not corrode at an unacceptable rate, and a system that includes sensors and control units for this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low-quality steel materials are used in hydrolysis apparatuses, then cost is reduced, but corrosion rate increases to unacceptable levels
Solution Approach 1:
The patent applies parameter changes by controlling the moisture content of the slurry to be below 40% (preferably 30-35%). This parameter change in the feeding process creates drier conditions that significantly reduce corrosion rates, enabling the use of low-quality steel materials (such as carbon steel or stainless steel grades 304, 316, 430) that would otherwise corrode too rapidly in wetter environments.
2Reliability
If high-quality corrosion-resistant materials are used in hydrolysis apparatuses, then corrosion rate is reduced, but cost increases significantly
Solution Approach 1:
The patent enables the use of cheaper, lower-quality steel materials by implementing strict moisture control during feeding. This approach replaces expensive high-quality corrosion-resistant materials (such as Ni-based alloys, tantalum, or high-grade stainless steels) with more economical alternatives, accepting that the cheaper materials will have shorter service lives but still providing acceptable performance under controlled dry feeding conditions.
3Ease of operation
If moisture content of slurry is increased, then ease of feeding is improved, but corrosion rate increases making low-quality materials unsuitable
Solution Approach 1:
The patent establishes a critical parameter threshold by controlling slurry moisture content to remain below 40% (preferably 30-35%). This parameter control creates optimal conditions where the slurry remains feedable while maintaining sufficiently dry conditions to protect low-quality steel materials from excessive corrosion, thus resolving the contradiction between ease of feeding and material protection.
4Reliability
If dewatering is intensified to reduce moisture content, then corrosion protection is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by implementing dewatering to achieve a specific moisture content range (30-40%) rather than complete drying. This partial dewatering approach provides sufficient corrosion protection for low-quality steel materials while avoiding the excessive complexity and cost associated with more intensive dewatering systems, thus balancing protection needs with system simplicity.
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 enables the safe use of less expensive, low-quality steel materials in hydrolysis apparatuses by controlling the moisture content, reducing corrosion rates and expanding the range of materials that can be used, making the process more cost-effective and scalable.
Implementation Method 1
a sensor, whose operation, for example, is based on near-infrared technology, or capacity or conductance measurements
Implementation Method 2
The hydrolysis is typically performed at high temperature, e.g. about or above 150 °C, and a challenge when performing the hydrolysis is that the combination of high temperature and low pH value makes the acidic water solution highly corrosive
Data Source
Figure 1
AI summary
The invention relates to a method for extraction of saccharides from a lignocellulosic material and comprises the steps of mixing the lignocellulosicmaterial with afluid; dewatering the mixture of lignocellulosic material and fluid; and introducing the dewatered mixture into an apparatus for performing hydrolysis of the dewatered mixture in the apparatus, wherein at least parts of the apparatus that come into contact with the dewatered mixture are made of a material that comprises iron in an amount of at least 50% by weight and nickel in an amount of at least 1.5% by weight. The method comprises further the steps of measuring the moisture content of the dewatered mixture, comparing the measured moisture content with a predefined value and, if the measured moisture content is above said predefined value, preventing the dewatered mixture from entering the apparatus. The invention relates also to a systemfor performing said method.