Polymeric Phenazonium Synthesis via In Situ Diazotization
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Solution Overview
Problem
Existing methods for producing polymeric phenazonium compounds require multiple steps and result in a significant amount of unreacted monomer in the end product, making them inefficient and requiring additional processing.
Innovation Solution
A process involving dissolving an amino compound in formic acid, adding a nitrite salt to diazotize it, and using sulfamic acid to neutralize excess nitrous acid, which simplifies the synthesis and reduces the number of steps, resulting in a highly concentrated polymerized phenazonium compound suitable for use in metal plating baths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional diazotization and boiling down methods are used, then polymeric phenazonium compounds can be produced, but the process requires multiple steps and results in significant unreacted monomer in the end product
Solution Approach 1:
The patent combines the diazotization step and polymerization step into a single simultaneous reaction process. The amino compound is diazotized in situ within the polymerization reaction mixture, eliminating the need for separate diazotization and isolation steps followed by a second polymerization step. This merging of operations directly reduces the number of processing steps while maintaining high polymerization efficiency and minimizing unreacted monomer.
2Ease of manufacture
If traditional methods are used, then polymeric phenazonium compounds are produced, but additional neutralization and refining steps are required
Solution Approach 1:
The reaction system is designed to be self-regulating and self-completing. The polymerization reaction proceeds to high conversion without requiring external neutralization or refining interventions. The process automatically maintains appropriate conditions for complete reaction, eliminating the need for additional processing steps that would otherwise be required to neutralize the product or remove impurities.
3Manufacturing precision
If conventional synthesis methods are used, then polymeric phenazonium compounds can be obtained, but a significant amount of unreacted monomer remains in the end product
Solution Approach 1:
The patent implements a continuous, single-phase reaction process where diazotization and polymerization proceed simultaneously and continuously to completion. This continuous action ensures that the reaction proceeds to high conversion without interruption or intermediate handling that could allow monomer to remain unreacted. The process maintains optimal reaction conditions throughout, ensuring complete consumption of starting materials and high purity of the final polymer product.
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 method produces a polymeric phenazonium compound with a higher concentration of polymerized material and fewer processing steps, eliminating the need for additional neutralization and refining, while minimizing nitrogen offgassing, and achieving bright, leveling copper coatings in a wide current density range.
Implementation Method 1
adding a nitrite salt to diazotize the amino compound
Implementation Method 2
using sulfamic acid to neutralize excess nitrous acid
Implementation Method 3
depositing bright copper layers instead of a crystalline matte deposit
Implementation Method 4
achieving bright, leveling copper coatings in a wide current density range
Data Source
AI summary
A process of making a polymeric phenazonium compound having the general formula:wherein R1, R2, R4, R5, R6, R8 and R9 are the same or different, and represent hydrogen, a low alkyl or a substituted aryl, R3 starts as NH2 and is diazotized followed by polymerization, R5 and R8 may alternatively represent monomeric or polymeric phenazonium radicals, R7 is a carbon in the aromatic ring, and wherein RX—N—RY represents a substituted amine, and RX and RY represent any combination of CH3, C2H5,and hydrogen, except that RX and RY cannot both be hydrogen, A is an acid radical, and n is an integer from 2 to 100. The polymeric phenazonium compound is usable in as an additive in a metal plating bath. The method includes the steps of: a) dissolving an effective amount of an amino compound in a formic acid solution; b) adding a nitrite salt to diazotize the amino compound; and c) adding sulfamic acid to neutralize any excess nitrous acid that may be formed in step b), whereby a polymeric phenazonium compound is produced.