Carbonizate Purification via Acid-Base Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high ash content in carbonizate from thermal recycling of rubber waste limits its recycling and application potential, as metal oxides on its surface deteriorate its functional properties, necessitating effective demineralization to enhance market value.
Innovation Solution
A method involving mixing carbonizate with sodium bicarbonate, followed by the introduction of deionized water and a strong mineral acid, stirring, filtering, and washing with deionized water, then treating with a strong base, and further washing and drying to reduce ash content, utilizing a ball mill for mixing and controlled temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If raw carbonizate is used directly from thermal recycling, then the process is simple and quick, but the high ash content (approximately 18%) limits its recycling and application potential
Solution Approach 1:
The patent applies preliminary action by performing demineralization treatment on carbonizate before its final application. The process pre-removes mineral impurities (ash content reduced from 18% to below 1%) through chemical treatment with acids and bases, ensuring the material is ready for high-value applications without functional deterioration
Solution Approach 2:
The patent changes key parameters of the carbonizate through systematic chemical treatment. The ash content is reduced from approximately 18% to below 1% through sequential acid and base treatments. The particle size is controlled at 0.02-0.3mm, and the process operates at temperatures of 70-95°C with specific acid concentrations (2-10% HCl, 13-40% H2SO4) to achieve optimal purification while preserving functional properties
2Manufacturing precision
If strong acids and multiple washing steps are used to reduce ash content, then the purity of carbonizate improves, but the process complexity and time consumption increase
Solution Approach 1:
The patent merges multiple functions into integrated process steps. The acid treatment simultaneously dissolves mineral impurities and prepares the surface for base neutralization. The base treatment concurrently neutralizes residual acids and removes additional impurities. Filtration and washing steps are combined to achieve both separation and purification in sequence, reducing the need for separate dedicated equipment for each function
Solution Approach 2:
The patent optimizes process parameters to balance purification effectiveness with operational simplicity. Acid concentrations are controlled at 2-10% for HCl and 13-40% for H2SO4, temperatures maintained at 70-95°C, and particle sizes controlled at 0.02-0.3mm. These parameter ranges achieve ash content reduction from 18% to below 1% while maintaining manageable process complexity and reasonable processing time
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 process effectively reduces the ash content of carbonizate from 18% to as low as 0.8%, improving its functional properties and market value by minimizing metal oxides on its surface.
Implementation Method 1
strong mineral acid and/or mixture of mineral acids are introduced into the obtained mixture, and next the whole is stirred at increased temperature
Implementation Method 2
the solution of a strong base is introduced into the solid residue, and the whole is stirred at increased temperature
Implementation Method 3
filtered at decreased pressure while washing with deionized water having increased temperature
Data Source
AI summary
A method of purification of carbonizate resulting from the thermal recycling process of rubber waste consists in that the carbonizate is mixed with sodium bicarbonate, then deionized water having increased temperature and strong mineral acid and/or mixture of mineral acids are introduced into the obtained mixture, and next the whole is stirred at increased temperature, and filtered at decreased pressure while washing with deionized water having increased temperature, the filtrate is discarded, the solution of a strong base is introduced into the solid residue, and the whole is stirred at increased temperature, then the obtained suspension is filtered at decreased pressure, and washed with deionized water having increased temperature, and next the filtrate is discarded, and the solid residue is dried.