Long Chain Dicarboxylic Acid Refining System Using Membrane Filtration
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Solution Overview
Problem
Current methods for refining long chain dicarboxylic acid, such as recrystallization with organic solvents, face challenges including impurity removal inefficiencies and residual solvent issues, leading to product purity and environmental concerns.
Innovation Solution
A refining system comprising membrane filtration, decolorization, acidification/crystallization, solid-liquid separation, and vacuum distillation, which eliminates the need for organic solvents and enhances product purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If recrystallization with organic solvent is used, then product purity is improved, but residual solvent remains in the product and environmental pollution occurs
Solution Approach 1:
The patent extracts and removes the organic solvent from the purification process entirely, replacing it with water-based extraction and crystallization methods. This eliminates residual solvent in the product while maintaining high purity through controlled crystallization from aqueous solutions
Solution Approach 2:
The patent changes the fundamental parameter of the purification medium from organic solvent to water-based solution. By adjusting pH, temperature, and concentration parameters in aqueous systems, the patent achieves effective purification without the harmful effects of organic solvents
2Productivity
If recrystallization with alcohol is used to improve yield, then refining efficiency is improved, but esterification occurs at elevated temperature producing new products that affect purity
Solution Approach 1:
The patent changes the solvent parameter from alcohol to water-based solutions, eliminating the esterification reaction that occurs with alcohols at elevated temperatures. This allows efficient heating and crystallization without side reactions that would compromise product purity
Solution Approach 2:
The patent converts the potential harm of high-temperature processing (which causes esterification with alcohols) into a benefit by using water-based systems that are thermally stable. This enables efficient energy input and rapid crystallization without generating unwanted esterification products
3Manufacturing precision
If repeated recrystallization is used to remove impurities, then product purity is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent performs preliminary concentration and pH adjustment of the fermentation broth before crystallization. This preliminary preparation creates optimal conditions for a single crystallization step to achieve high purity, eliminating the need for repeated recrystallization cycles
Solution Approach 2:
The patent utilizes controlled phase transition from dissolved state to crystalline state through temperature and pH adjustment. This single-phase transition approach, properly controlled, achieves impurity separation as effectively as multiple recrystallization cycles but with simpler procedure and less time consumption
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 system achieves high product purity, reduces environmental pollution, and simplifies the refining process by using membrane filtration and distillation, resulting in a solvent-free, high-quality long chain dicarboxylic acid.
Implementation Method 1
a first membrane filtration unit, for a membrane filtration of a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom
Implementation Method 2
a first decolorization unit, for carrying out a first decolorization treatment to the filtrate obtained after the membrane filtration
Implementation Method 3
a first acidification/crystallization unit, for carrying out an acidification/crystallization of a filtrate obtained after the membrane filtration to give a solid-liquid mixture
Data Source
AI summary
The present disclosure provides a system for refining long chain dicarboxylic acid, comprising: a first membrane filtration unit, for a first membrane filtration of a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom; a first decolorization unit, for carrying out a first decolorization treatment to the filtrate obtained after the membrane filtration; a first acidification/crystallization unit, for carrying out a first acidification/crystallization of a filtrate obtained after the membrane filtration to give a solid-liquid mixture; a first separation unit, for a solid-liquid separation of the solid-liquid mixture; a drying unit, for drying the solid separated by the separation unit to give a first solid. By using the refining system according to the present disclosure, the purity of the obtained product is high, and the disadvantages such as poor quality of the product obtained by crystallization from a solvent and environment pollution caused by a solvent can be overcome.