2-Alkylanthracene Separation by Crystallization for Catalyst Protection
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Solution Overview
Problem
Existing methods for producing 2-alkylanthraquinone are environmentally harmful, inefficient, and fail to effectively separate and purify 2-alkylanthracene, leading to catalyst deactivation and process inefficiencies in hydrogen peroxide production.
Innovation Solution
A method involving the separation of 2-alkylanthracene through melting crystallization and distillation, followed by catalytic oxidation using specific solvents and catalysts, combined with an adsorption desulfurization process using amorphous alloys to purify the 2-alkylanthraquinone working fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the phthalic anhydride process is used to produce 2-alkylanthraquinone, then the production capacity is achieved, but serious pollution problems occur and post-treatment process becomes complex
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing the traditional phthalic anhydride process with a direct alkylation of anthracene using alkyl halides or alkenes. This fundamental parameter change in the reaction pathway eliminates the need for phthalic anhydride and subsequent complex transformations, thereby reducing pollution while maintaining production capacity
Solution Approach 2:
The patent extracts and removes the harmful phthalic anhydride intermediate from the synthesis pathway. By directly alkylating anthracene to form 2-alkylanthraquinone, the process eliminates the phthalic anhydride step entirely, removing the source of pollution and simplifying the post-treatment process
2Device complexity
If the 2-alkylanthraquinone working fluid is used without pretreatment, then the process operation is simplified, but the impurities seriously affect the process operation and product indexes
Solution Approach 1:
The patent applies preliminary action by implementing a pretreatment step for the 2-alkylanthraquinone working fluid before it enters the hydrogen peroxide production process. This pretreatment removes impurities that would otherwise affect product quality, ensuring reliable product indexes while maintaining simplified process operation through a single, integrated pretreatment step
3Ease of manufacture
If conventional separation methods are used for 2-alkylanthracene, then the separation process is straightforward, but the purity is insufficient leading to catalyst deactivation
Solution Approach 1:
The patent utilizes phase transitions in the form of melting and crystallization to separate and purify 2-alkylanthracene. By controlling the melting and crystallization processes, the method achieves high purity separation of 2-alkylanthracene from the reaction mixture, preventing catalyst deactivation while maintaining an economically viable separation 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
This method enhances the purity and yield of 2-alkylanthracene, reduces catalyst deactivation, and improves the efficiency and environmental impact of hydrogen peroxide production by simplifying the process and reducing equipment investment.
Implementation Method 1
separating 2-alkylanthracene from the reaction (such as alkylation) of anthracene by melting crystallization
Implementation Method 2
separating 2-alkylanthracene from the reaction (such as alkylation) of anthracene by distillation
Implementation Method 3
carrying out a catalytic oxidation
Implementation Method 4
a pretreatment method of 2-alkylanthraquinone working fluid involving adsorption desulfurization and impurity removal
Data Source
AI summary
A method for preparing 2-alkylanthracene includes the step of separating 2-alkylanthracene from a reaction product of anthracene alkylation reaction. The anthracene alkylation reaction is a reaction of anthracene and an alkylation reagent under an alkylation condition and in the presence of an alkylation reaction solvent and a catalyst. The reaction product of the anthracene alkylation reaction contains anthracene and the product of a series of alkylanthracenes containing 2-alkylanthracene.