Tau-Fluvalinate Purification With Pre-Distillation Acid Neutralization
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Solution Overview
Problem
Industrial-scale production of Tau-fluvalinate is hindered by corrosion of expensive equipment due to hydrochloric acid release from impurities, which existing neutralization methods fail to adequately address.
Innovation Solution
An optimized production process involving the addition of a neutralizing agent, such as MgO or CaO, followed by heating at 130°C for 2 hours, cooling to 60°C, and filtering the resulting salt, effectively neutralizes acid and prevents corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to purify Tau-fluvalinate, then purification is achieved, but corrosion of expensive plant equipment occurs due to hydrochloric acid release from impurities
Solution Approach 1:
The patent applies preliminary action by neutralizing hydrochloric acid before distillation. A neutralizing agent is added to the crude Tau-fluvalinate solution prior to distillation, converting the harmful HCl into a neutral salt, thereby preventing corrosion during the subsequent distillation process while maintaining purification effectiveness
Solution Approach 2:
The patent uses a neutralizing agent as an intermediary substance between the harmful HCl and the distillation process. This intermediary neutralizes the acid before it can cause corrosion to the plant equipment, allowing distillation to proceed safely with purification
2Manufacturing precision
If high vacuum distillation is used to purify Tau-fluvalinate, then purification is achieved, but expensive sophisticated reactors are required which are still susceptible to corrosion
Solution Approach 1:
The patent neutralizes HCl before distillation, which eliminates the need for sophisticated corrosion-resistant reactors. By removing the harmful acid component in advance, standard reactors can be used instead of expensive sophisticated ones, reducing device complexity and cost while maintaining purification capability
3Ease of manufacture
If neutralization is performed without timely acid neutralization, then impurities remain which can cause corrosion later in the process
Solution Approach 1:
The patent emphasizes timely neutralization as a preliminary step before distillation. By neutralizing HCl at the appropriate stage (before distillation but after esterification), the process maintains simplicity while preventing later acid release and corrosion issues
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 purified Tau-fluvalinate product without damaging expensive reactors by ensuring complete acid neutralization before distillation, using sophisticated reactors only when necessary.
Implementation Method 1
adding a neutralizing agent to a crude solution of Tau-fluvalinate... timely acid neutralization... ensuring complete acid neutralization
Implementation Method 2
heating the solution of Tau-fluvalinate at an elevated temperature of 130°C or more... heating the solution of Tau-fluvalinate at a temperature of 130°C or more for more than 2 hours
Implementation Method 3
cooling the solution of Tau-fluvalinate... cooling the solution of Tau-fluvalinate to about 60°C
Implementation Method 4
filtering the resulting salt of the neutralizing agent
Implementation Method 5
distillation remains only option of purification... Tau-fluvalinate is a relatively high boiling point material and temperature sensitive. Thus, this material could be distilled only at very high vacuum (below 0.1 mbar)
Data Source
AI summary
The present invention relates to an improved process for the industrial-scale production process of Tau-fluvalinate in a purified form comprising optimization of the reaction conditions by timely acid neutralization, resulting in preventing corrosions of the expensive plant equipment.