Device and electrolysis method for preparing potassium formate by electrolyzing carbon dioxide

Abstract

The invention discloses a device and an electrolysis method for preparing potassium formate by electrolyzing carbon dioxide. Potassium hydroxide and carbon dioxide are used as raw materials and are converted into potassium formate by the electrolysis method. The process comprises the following steps: in a diaphragm type double-chamber electrolytic tank, adding a potassium hydroxide aqueous solution serving as an electrolyte into a cathode chamber, adding acidic potassium salt or an acidic aqueous solution serving as an anode electrolyte into an anode chamber, respectively putting a cathode electrode and an anode electrode into the cathode chamber and the anode chamber, performing electrifying for electrolysis, determining a reaction endpoint by measuring pH values, finally acquiring a potassium formate aqueous solution in the cathode chamber, feeding the potassium formate aqueous solution into a distillation reactor, and performing distilling to obtain a potassium formate solid product.

Description

technical field [0001] The invention relates to the technical field of preparation of fine chemical materials, in particular to a device and an electrolysis method for electrolyzing carbon dioxide to produce potassium formate. Background technique [0002] Potassium formate is an important chemical product, mainly used in oil field drilling fluid, snow melting agent, antifreeze agent, carbon black surface modifier, crop foliar fertilizer, cement early strength agent, leather tanning agent, etc. The market demand is large and has a good development prospect. The current production methods of formic acid include formic acid and potassium hydroxide synthesis method, CO and potassium hydroxide high-pressure synthesis method, etc. There is generally the problem of high production costs. CO can be made by electrolysis in aqueous solution 2 converted to formate, while the majority is based on CO 2 The reduction was studied with formic acid as the target product. If formic acid...

AI Technical Summary

Problems solved by technology

[0004] Since the cathode chamber is continuously fed with CO 2 , CO 2 Further generation of KHCO with KOH 3 , so that the final products HCOOK and KHCO in the cathode chamber 3 inseparable

There are literatures that use acidic solution as the anolyte in the research [Electrochemistry, 2017, 23, 72-79], the literature is based on formic acid as the target product, and there is no report on CO 2 Electrochemical reduction obtains the specific operation method of potassium formate

Images