Iron Coordination Complex Anticaking Agent for Salt
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inorganic salts, such as sodium chloride, undergo caking due to their hygroscopic nature, leading to clumping and hardening, which is detrimental for handling and application, and also cause corrosion, necessitating the need for effective anticaking and anticorrosion agents that do not include sodium ferrocyanide or nitrogen-containing compounds.
Innovation Solution
A coordination complex of iron with a salt anion of an organic acid, specifically malates, polyacrylates, or diphosphonates, is used as an anticaking agent to prevent caking and corrosion, forming a free-flowing solid salt composition that meets anti-corrosion performance standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium ferrocyanide (YPS) is used as an anticaking agent, then caking is effectively prevented, but it produces explosive nitrogen trichloride when used with electrolytic chlorine generation
Solution Approach 1:
The patent removes the nitrogen-containing cyanide moiety from the anticaking agent structure. Instead of using sodium ferrocyanide which contains the problematic -CN group, the invention uses sodium ferroxalate which contains oxalate ligands without nitrogen, thereby eliminating the source of explosive NCl3 formation while maintaining the anticaking functionality through the iron-based coordination complex structure
Solution Approach 2:
The patent introduces an intermediary substance - the iron coordination complex with oxalate ligands - that mediates between the need for effective caking prevention and the requirement to avoid harmful reactions with chlorine. This intermediary agent provides the anticaking function through its coordination chemistry and physical properties without containing nitrogen that could react with chlorine to form explosives
2Ease of operation
If conventional anticaking agents are used to prevent caking, then salt flowability is improved, but corrosion of metal surfaces increases
Solution Approach 1:
The patent employs a composite material approach by creating an iron coordination complex with oxalate ligands, combining the anticaking properties of iron-based compounds with the corrosion-inhibiting characteristics of oxalate. This composite structure provides dual functionality: preventing caking through the iron coordination chemistry while simultaneously reducing corrosion through the protective nature of the oxalate ligands on metal surfaces
3Reliability
If meso-tartaric acid is used as an anticaking agent, then caking is prevented, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent adopts a simpler, more economical chemical structure - sodium ferroxalate - that can be manufactured through straightforward synthesis from readily available materials (iron salts and oxalic acid). This replaces the complex and expensive meso-tartaric acid production process, making the anticaking agent more economically viable while maintaining effective performance
Solution Approach 2:
The patent changes the chemical parameters of the anticaking agent from complex polyhydroxycarboxylic acid structures (like meso-tartaric acid) to simpler iron-oxalate coordination complexes. This parameter change simplifies the molecular structure, reduces manufacturing steps, and lowers production costs while preserving the essential anticaking functionality
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 iron-based coordination complex effectively inhibits caking and corrosion, maintaining the salt in a free-flowing state and reducing corrosion by at least 70% compared to sodium chloride, while being environmentally friendly and suitable for various applications, including deicing and food-grade salts.
Implementation Method 1
The anticaking agents comprise a coordination complex of iron and a salt anion of an organic acid
Implementation Method 2
In order for a corrosion inhibited snow and ice control product to meet this standard, it must demonstrate that it is at least 70% less corrosive than sodium chloride alone
Data Source
AI summary
Anticaking agents for inhibiting or preventing caking of inorganic salt granules are provided. The anticaking agents comprise a coordination complex of iron and a salt anion of an organic acid, wherein the salt anion is selected from the group consisting of malate, polyacrylate, diphosphonate, and mixtures thereof. Free-flowing, solid salt compositions resistant to caking are also described herein, along with methods of melting ice and/or snow on a surface or inhibiting the accumulation or formation of ice and/or snow on a surface, and methods of preventing or inhibiting caking of solid inorganic salt granules.