Purified Sodium Nitrite Crystals Anti-Caking Process
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Solution Overview
Problem
The production of sodium nitrite is hindered by the formation of impurities like sodium nitrate and other residues, making it difficult to obtain a purified form, especially for pharmaceutical applications, and the handling of sodium nitrite crystals is challenging due to lump formation and hygroscopic nature, which is not cost-effective.
Innovation Solution
A process involving the mixing of air and ammonia in a venturi body mixer, filtration through a HEPA filter, selective oxidation using catalytic gauzes, and absorption in alkali towers to produce a purified sodium nitrite with minimal impurities, followed by recrystallization and anti-caking agent addition to optimize the form and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional production methods are used to manufacture sodium nitrite, then production cost is reduced, but purity is insufficient (99% to 99.2% required) and impurities like sodium nitrate and heavy metals remain
Solution Approach 1:
The patent applies preliminary action by pre-mixing air and ammonia in a venturi mixer before oxidation, and by using HEPA filtration to remove impurities before the main reaction process. This preliminary preparation ensures that the subsequent production process generates minimal impurities, achieving 99% to 99.2% purity without requiring extensive post-processing purification steps that would increase cost.
Solution Approach 2:
The patent uses an intermediary approach by introducing a coating mixture containing anti-caking agents and lubricants that forms a protective layer on the sodium nitrite crystals. This coating acts as an intermediary barrier that prevents lump formation and reduces hygroscopicity, improving handling properties while maintaining purity. The coating process is integrated into the existing production line, avoiding additional purification cost.
2Ease of operation
If conventional crystalline form of sodium nitrite is produced, then production process is simple, but handling is difficult due to lump formation and hygroscopic nature
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the sodium nitrite crystals through coating. The coating process changes parameters such as surface hydrophobicity, mechanical strength, and flow characteristics. By adjusting the composition and application parameters of the coating mixture (anti-caking agents, lubricants, binders), the crystals are transformed from a lump-prone, hygroscopic material into free-flowing, stable granules that are easy to handle and transport.
3Manufacturing precision
If multiple process lines are developed to meet various standard requirements, then product quality complies with standards, but production cost increases
Solution Approach 1:
The patent applies universality by developing a single integrated production process that simultaneously achieves multiple quality objectives: 99% to 99.2% purity, minimal heavy metal content, controlled crystal form, and anti-caking properties. The venturi mixing system, HEPA filtration, catalytic oxidation, and coating process work together in one continuous line to produce sodium nitrite that meets pharmaceutical-grade requirements without needing separate process lines for different standards, thereby maintaining cost effectiveness.
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 process achieves a sodium nitrite with a purity level of 99% to 99.2% and minimal impurities, including heavy metals, and a modified crystalline granule form that is easier to handle and transport, complying with industrial standards while being cost-effective.
Implementation Method 1
mixing of air and ammonia in a venturi body mixer
Implementation Method 2
filtration through a HEPA filter
Implementation Method 3
selective oxidation using catalytic gauzes
Implementation Method 4
absorption in alkali towers to produce a purified sodium nitrite
Implementation Method 5
followed by recrystallization and anti-caking agent addition to optimize the form and purity
Data Source
AI summary
A present disclosure describes about an improved form of purified crystalline sodium nitrite. The said form of sodium nitrite may comprise a purity level between 99% to 99.2%. The form of sodium nitrite may also comprise an amount of sodium nitrate no greater than 0.7%. The present disclosure also relates to a method of obtaining an improved form of purified crystalline sodium nitrite with minimum impurities.