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Method for electrochemically synthesizing trimethylamine

A trimethylamine and electrochemical technology, applied in the field of trimethylamine synthesis by electrochemical method, can solve problems such as environmental pollution, equipment, harsh reaction conditions, complex process flow, etc., and achieve simplified reaction steps, shortened reaction time, and simple process flow Effect

Inactive Publication Date: 2014-11-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for electrochemically synthesizing trimethylamine to overcome the deficiencies in the prior art of harsh equipment and reaction conditions, complex process flow, and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] At normal temperature and pressure, mix N,N-dimethylformamide and water at a volume ratio of 7:1 to form a 30mL solution, then add a supporting electrolyte of 0.5mol / L tetramethylammonium chloride to form an electrolyte, and add a In the airtight electrolytic cell, fully stir, pass nitrogen gas into the above electrolytic cell for 1 hour, and then use 350mA / cm 2 The current density of the electrochemical reaction is carried out, the Pt electrode is selected as the anode, and the Cu electrode is used as the cathode. The gas product is removed through a 5mol / L sodium hydroxide solution, collected by a gas collection device, and then used by the American Agilent company GC-MS , model: 7890A-5975C; ion source ionization method: EI, product detection, confirmed that the product is trimethylamine, the conversion rate is 95%, the yield is 89%, the current efficiency is 76%, and the gas is removed with sodium hydroxide solution , to obtain trimethylamine with a purity of 99%. ...

Embodiment 2

[0030] At normal temperature and pressure, mix N,N-dimethylformamide and water at a volume ratio of 6:1 to form a 30mL solution, then add a supporting electrolyte of 0.3mol / L tetramethylammonium chloride to form an electrolyte, and add a In the airtight electrolytic cell, fully stir, pass nitrogen gas into the above electrolytic cell for 1 hour, and then use 250mA / cm 2 The current density of the electrochemical reaction is carried out, the Au electrode is selected as the anode, and the Pd electrode is used as the cathode. The gas product is removed through a 4mol / L sodium hydroxide solution, collected by a gas collection device, and then the gas spectrometer of Agilent Company of the United States is used. , model: 7890A-5975C; ion source ionization method: EI, product detection, confirmed that the product is trimethylamine, the conversion rate is 93%, the yield is 87%, the current efficiency is 75%, and the gas is removed with sodium hydroxide solution , to obtain trimethylam...

Embodiment 3

[0033] At normal temperature and pressure, mix N,N-dimethylformamide and water at a volume ratio of 5:1 to form a 30mL solution, then add a supporting electrolyte of 0.6mol / L tetramethylammonium chloride to form an electrolyte, and add a In the airtight electrolytic cell, fully stir, pass nitrogen gas into the above electrolytic cell for 1 hour, and then use 300mA / cm 2 The current density of the electrochemical reaction is carried out, the Ti-based oxide electrode is selected as the anode, and the Ni electrode is used as the cathode. The gas product is removed through a 5mol / L sodium hydroxide solution, collected by a gas collection device, and then the gaseous gas produced by Agilent Company of the United States is used. Combined instrument, model: 7890A-5975C; ion source ionization method: EI, to detect the product, confirm that the product is trimethylamine, the conversion rate is 92%, the yield is 81%, and the current efficiency is 72%. Carry out impurity removal, obtain t...

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Abstract

The invention provides a method for electrochemically synthesizing trimethylamine. At normal temperature and pressures, N, N-dimethyl formamide and water are mixed to solution according to a proportion, then supporting electrolyte tetramethyl ammonium chloride is added to the solution to be mixed to electrolyte, the electrolyte is added to a sealed electrolytic tank and fully mixed, nitrogen is led to the electrolytic tank for an electrochemical reaction, then a gaseous product is subjected to purification through strong base solution, and trimethylamine with the purity being 99% is obtained. The method is simple in process and convenient to operate, the obtained high-purity trimethylamine is easy to collect, a new path is developed for synthesis of organic amines, and the method is a process route with high industrial synthesis value.

Description

technical field [0001] The invention relates to a method for synthesizing trimethylamine, in particular to a technical scheme for synthesizing trimethylamine by an electrochemical method. Background technique [0002] Trimethylamine is a tertiary amine, molecular formula C 3 h 9 N, is an important chemical product, used in pesticides, dyes, medicine and organic synthesis, etc.; used as disinfectant, alarm agent for natural gas, analytical reagent and raw material for organic synthesis, and also used in medicine, pesticides, photographic materials, rubber Raw materials for auxiliary agents, explosives, chemical fiber solvents, surfactants and dyes. The reaction product with ethylene oxide is used as a catalyst for polycondensation reaction; the reaction product choline chloride with 2-chloroethanol is used as an additive for chicken feed. The main organic synthetic raw material can be used to produce various industrial additives, surfactants and dyes, ion exchange resins, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B3/25
Inventor 梁镇海贾瑞龙宋秀丽杨慧敏董文燕郭敏敏
Owner TAIYUAN UNIV OF TECH