Benzotriazole Post-Treatment via pH-Dependent Extraction
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Solution Overview
Problem
Existing methods for benzotriazole (BTA) synthesis in petrochemical engineering are inefficient and environmentally polluting, with high energy consumption and limited recovery of BTA from aqueous layers in batch-type operations.
Innovation Solution
A continuous post-treatment method involving acidification, water washing, extraction, back-extraction, dehydration, and distillation, utilizing differences in BTA solubility at varying pH levels to achieve separation with reduced energy consumption and environmental impact, including the use of specific acidification and extraction conditions to optimize BTA recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch-type synthesis method is used, then the process is simple to operate, but the production efficiency is low
Solution Approach 1:
The batch synthesis process is segmented into multiple continuous processing stages: acidification stage, extraction stage, back-extraction stage, and dehydration stage. Each stage is independently optimized and can be operated continuously, thereby increasing overall production efficiency while maintaining operational simplicity through modular design
Solution Approach 2:
The patent transforms the traditional batch operation into continuous operation across all processing stages. The continuous acidification, extraction, back-extraction, and dehydration processes eliminate idle time between batches, ensuring continuous useful action and significantly improving production efficiency
2Use of energy by moving object
If traditional water washing and extraction method is used, then the operation is simple, but the energy consumption is high
Solution Approach 1:
The patent utilizes parameter changes in pH to control BTA solubility and distribution between phases. By adjusting pH during acidification and back-extraction stages, the process achieves efficient separation without requiring excessive energy input for heating or prolonged processing, thereby reducing energy consumption while maintaining ease of operation
Solution Approach 2:
The patent employs extraction and back-extraction operations to selectively transfer BTA between organic and aqueous phases. This approach replaces energy-intensive evaporation and drying methods with mass transfer-based separation, significantly reducing energy consumption while keeping the operation straightforward
3Loss of substance
If BTA is not recovered from aqueous layer, then the process is simple, but the loss of substance is high
Solution Approach 1:
The patent performs preliminary acidification treatment before extraction, which converts BTA into a form that can be efficiently recovered. The back-extraction stage then recovers BTA from the aqueous layer, preventing substance loss. This preliminary preparation enables high recovery rates without significantly increasing overall process complexity
Solution Approach 2:
Instead of discarding the aqueous layer after extraction, the patent implements a back-extraction stage to recover BTA from this waste stream. This recovery approach minimizes substance loss and improves overall yield while adding only one additional processing stage to the existing process
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 method achieves high economic efficiency, low energy consumption, and reduced environmental pollution, with improved product quality and wastewater treatment efficiency compared to batch-type processes, while allowing for easy industrialization and efficient BTA production.
Implementation Method 1
The BTA synthetic fluid and an acidification reagent are continuously fed into an acidification reactor for a continuous acidification
Implementation Method 2
utilizing the difference in solubility of the BTA in water under different pHs to achieve separation by extraction
Implementation Method 3
The extracted oil layer in (3) is fed into a back-extraction tower for a continuous back-extraction
Implementation Method 4
The water-washed oil layer in (2) is subjected to a continuous dehydration
Implementation Method 5
subjecting the BTA synthetic fluid to post-treatment steps of continuous acidification, water washing, extraction, back-extraction, dehydration, and distillation
Data Source
AI summary
The present invention belongs to the technical field of petrochemical engineering, and relates to a method for continuous post-treatment of benzotriazole (abbreviated as BTA) synthetic fluid. In particular, the present invention relates to a method for synthesizing BTA, including subjecting the BTA synthetic fluid to post-treatment steps of continuous acidification, water washing, extraction, back-extraction, dehydration, and distillation and the like. The method utilizes the difference in solubility of the BTA in water under different pHs to achieve separation by extraction without consuming a large amount of evaporation energy. The present invention is easy to operate, has little environmental pollution, high economic efficiency and low energy consumption, and is easily industrialized.