Electrochemical preparation method for ethylene
A technology of ethylene and electrolyte, applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., to achieve the effect of short reaction cycle, low reaction cost and wide source
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Embodiment 1
[0025] Drugs: Deionized water (18.2MΩ, Merck Milli-QAdvantageA10 ultrapure water system), succinic acid, potassium hydroxide, potassium sulfate and sulfuric acid used were bought back and used directly without further purification.
[0026] Electrolytic cell: The electrolytic cell used in this reaction is 50mm 3 The screw port can be sealed without diaphragm Pikes glass electrolytic cell. The electrolysis system is a three-electrode system, in which a Pt sheet (1cm×1cm) is used as the working electrode, a Pt mesh (60 mesh, 1cm×1cm) is used as the counter electrode, and a Hg / HgO (1M KOH) electrode is used as the reference electrode.
[0027] Add 1.5 g of succinic acid and 6.25 ml of 2 mol / L KOH aqueous solution (as a supporting electrolyte) to the beaker and mix them, then add deionized water to make the volume to 25 ml. Put the magnet into the beaker, turn on 600rpm and stir for 10min, then add it to the above electrolytic cell. Place the electrolytic cell in a water bath at...
Embodiment 2-25
[0030] The concentration of succinic acid, the type of solvent, the type, concentration and applied voltage of the supporting electrolyte affect the selectivity of ethylene in Table 1. Wherein embodiment 2-21 and 23-25 use working electrode with embodiment 1, the working electrode that embodiment 22 uses is graphite electrode. Others are the same as embodiment 1.
Embodiment 1-25
[0032]
[0033]
[0034] It can be seen from the data in Table 1 that when the solvent is deionized water and other conditions are certain, the higher the concentration of succinic acid, the higher the Faradaic efficiency and ethylene selectivity; considering other factors, generally choose the concentration of succinic acid 0.5mol / L. Under certain other conditions, the faradaic efficiency and ethylene selectivity are high when alkaline electrolyte is added, and the stronger the alkalinity, the higher the faradaic efficiency and ethylene selectivity; when the supporting electrolyte is neutral or acidic, the ethylene selectivity is lower; Considering other factors, KOH is generally selected as the alkaline electrolyte, and the molar ratio of KOH to succinic acid is 1:1. Under certain other conditions, the higher the voltage, the higher the Faradaic efficiency and ethylene selectivity; when the voltage is lower than 3V, the Faradaic efficiency and ethylene selectivity are ...
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