Method for promoting CO2 to participate in synthesis of carboxylic acid from chlorine-containing compound based on electrochemistry
By promoting the reaction of CO2 with chlorine-containing compounds through electrochemical methods to generate carboxylic acids, the limitations of chlorinated compound synthesis in existing technologies and the environmental problems of polyvinyl chloride treatment are solved, efficient and simple carboxylic acid synthesis and polyvinyl chloride dechlorination are achieved, and the reaction mode and scope of application are expanded.
Patent Information
- Application Number
- CN202410401322.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-09-16
AI Technical Summary
In the existing technology, the conversion of chlorinated compounds with CO2 is limited to the synthesis of activated chlorinated substrates and monocarboxylic acid products, which requires transition metal catalysts and complex ligands. In addition, the degradation and recovery of polyvinyl chloride are problematic, and traditional treatment methods have equipment corrosion and environmental pollution problems.
An electrochemical method is used to promote the participation of CO2 in the synthesis of carboxylic acids from chlorine-containing compounds. Chlorine-containing compounds are reduced by electron transfer on the electrode surface to generate alkyl radicals, which react with CO2 to form carboxylic acid products. It is suitable for the dechlorination and carboxylation of non-activated chlorinated compounds and polyvinyl chloride.
It has achieved the efficient synthesis of various carboxylic acids under mild conditions, expanded the reaction mode of chlorinated compounds, is compatible with different molecular weights and polyvinyl chloride, is easy to operate, has a wide range of applications, and solves the limitations and environmental problems of traditional methods.
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Figure CN120649031A_ABST
Abstract
Claims
1. A method for synthesizing carboxylic acids from chlorine-containing compounds by electrochemically promoting CO2, characterized in that: The following steps are involved: A chlorine-containing compound, an electrolyte, and a solvent are added to a reactor equipped with electrodes, and the air in the reactor is replaced with CO2; Then, electrolyze at 50-70°C with a current of 25-75 mA for 4-10 hours, acidify, and separate to obtain the product. The chlorine-containing compound is polyvinyl chloride or a compound as shown in formula I R-Cl ( Wherein, R is an alkyl group or a substituted alkyl group.
2. The method for synthesizing carboxylic acid by electrochemically promoting CO2 to participate in chlorine-containing compounds according to claim 1, characterized in that: The R is one of the following substituents:
3. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemically promoted CO2 according to claim 1, characterized in that: The molar ratio of the chlorine-containing compound to the electrolyte is 1:0.01-10.
4. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemical promotion of CO2 according to claim 1, characterized in that: The molar ratio of the chlorine-containing compound to the electrolyte is 1:
3.
5. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemically promoted CO2 according to claim 1, 3 or 4, characterized in that: The electrolyte is sodium iodide, lithium bromide, sodium perchlorate, lithium perchlorate, ammonium perchlorate, tetramethylammonium iodide, tetraethylammonium iodide, tetrabutylammonium iodide, tetrahexylammonium iodide, tetraoctylammonium iodide, tetradecylammonium iodide, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium perchlorate, tetrabutylammonium tetrafluoroborate or tetrabutylammonium hexafluorophosphate.
6. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemically promoted CO2 according to claim 1, characterized in that: An additive is also added into the reaction container, and the additive is phthalate, monohydrosilane, dihydrosilane, trihydrosilane, dimethylphenylsilane or polysilane.
7. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemical promotion of CO2 according to claim 6, characterized in that: The molar ratio of the additive to the chlorine-containing compound is 0.001 to 10:
1.
8. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemical promotion of CO2 according to claim 1, characterized in that: The CO2 pressure in the reactor is 0.1 to 50 times the atmospheric pressure.
9. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemically promoted CO2 according to claim 1, characterized in that: The electrode material is a carbon electrode, a metal electrode or a doped electrode; the carbon electrode is a graphite rod, graphite felt, graphite plate or glassy carbon electrode; the metal electrode is a magnesium bar, zinc sheet, aluminum sheet, iron sheet, copper sheet, cobalt sheet, niobium sheet, lead sheet, molybdenum sheet, silver sheet, platinum sheet, foamed lead, foamed copper, foamed iron or foamed silver; the doped electrode is a graphite-doped boron electrode.
10. The method for synthesizing carboxylic acids from chlorine-containing compounds based on electrochemical promotion of CO2 according to claim 1, characterized in that: The solvent is acetonitrile, 1,4-dioxane, tetrahydrofuran, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, nitromethane, dichloromethane, acetone or N-methylpyrrolidone.