Cogeneration method for producing monopotassium phosphate and potassium diformate

The present invention discloses a cogeneration method for producing monopotassium phosphate and potassium diformate. The method comprises: synthesizing an "alkaline potassium formate synthetic liquid" by using inexpensive exhaust gas carbon oxide from a submerged arc furnace and potassium hydroxide; reacting phosphoric acid with potassium formate to producing monopotassium phosphate and a by-product formic acid; and using the formic acid and potassium formate to synthesize potassium diformate, wherein an ''acid mother liquor'' is a by-product and is recycled to neutralize the ''synthetic liquid'' for reducing alkalinity. Compared with the prior art, the technical solution provided by the present invention forms an industry chain to cogenerate potassium diformate and monopotassium phosphate so as to achieve the technical objectives of environmental protection, energy saving and clean production.