Crude Corn Oil Modifiers for Bayer Aluminum Hydroxide Agglomeration
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Solution Overview
Problem
Existing methods for controlling crystal size and distribution in the Bayer process for aluminum hydroxide production are inefficient, leading to suboptimal yields and economic challenges.
Innovation Solution
The use of crystal growth modifier (CGM) compositions comprising crude corn oil derived from bioethanol and biodiesel processes, which include C16 and C18 ethyl esters, diglycerol and triglycerol esters of long chain fatty acids, and a hydrocarbon carrier liquid, to enhance crystal agglomeration in the precipitation stage of the Bayer process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional commercial crystal growth modifiers are used in the precipitation stage, then crystal size and distribution can be controlled to some extent, but the production yield and economic efficiency remain suboptimal
Solution Approach 1:
The patent changes the chemical composition parameters of the crystal growth modifier by using crude corn oil derived from bioethanol and biodiesel processes instead of traditional commercial CGMs. This compositional parameter change results in both improved crystal size control and enhanced production yield, resolving the contradiction between reliability and productivity
Solution Approach 2:
The invention uses a composite material system consisting of crude corn oil containing C16 and C18 ethyl esters, diglycerol and triglycerol esters of long chain fatty acids, and a hydrocarbon carrier liquid. This composite CGM composition achieves superior performance in both crystal size control and production yield compared to traditional single-component modifiers
2Ease of operation
If crystal size is increased through traditional CGM methods, then separation from liquor becomes easier, but the overall yield and quality of aluminum hydroxide are compromised
Solution Approach 1:
The patent applies local quality by creating a non-uniform crystal size distribution where different size ranges serve different purposes: larger crystals (e.g., +45 μm) facilitate easy separation from liquor, while maintaining sufficient quantities of medium-sized crystals for high yield. The crude corn oil-based CGM enables this differentiated crystal population structure
3Manufacturing precision
If precipitation temperature and cooling rate are carefully controlled, then crystal size distribution improves, but the process complexity and operational difficulty increase
Solution Approach 1:
The patent introduces crude corn oil-based CGM as an intermediary substance that mediates between the precipitation process parameters and the final crystal size distribution. This chemical intermediary simplifies the control process by providing a direct mechanism for crystal growth modification, reducing the need for complex temperature and cooling rate control while achieving precise crystal size distribution
Solution Approach 2:
The CGM composition derived from crude corn oil contains natural components (C16 and C18 ethyl esters, diglycerol and triglycerol esters) that self-organize to control crystal growth. This self-service mechanism reduces operational complexity by allowing the additive to automatically adjust crystal size distribution without requiring sophisticated process control systems
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 CGM compositions effectively increase the production of larger alumina trihydrate particles, improving yield and efficiency in the Bayer process by enhancing crystal growth and agglomeration, outperforming traditional commercial CGMs.
Implementation Method 1
The growth of these crystals is aided by the use of fine aluminum hydroxide particles known as 'seeds'. These seeds provide anchor surfaces on which the crystals nucleate and grow.
Implementation Method 2
In the precipitation stage, aluminum hydroxide (Al(OH)3) crystals are precipitated from the sodium aluminate solution.
Data Source
AI summary
Compositions and methods used in the modification of crystallization, particle size, and distribution, of aluminum hydroxide from liquor in an aluminum hydroxide production process, such as the Bayer process. More particularly, crystal growth modifier compositions comprising a component of crude corn oil derived from a bioethanol production process and/or a component of biodiesel.