Cogeneration method for producing monopotassium phosphate and potassium diformate

Abstract

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.

Description

technical field [0001] The present invention relates to a kind of method of producing potassium dihydrogen phosphate to co-produce potassium diformate, more specifically, to carbon monoxide and potassium hydroxide to synthesize alkaline potassium formate synthetic liquid, react with phosphoric acid to produce potassium dihydrogen phosphate and co-produce potassium diformate Methods. Background technique [0002] The production of formate in my country started industrial production in the 1950s by the Tianjin Organic Synthesis Plant, and gradually provided free technical services to other oxalic acid, formic acid, and hydrosulfite manufacturers in the form of technical exchange assistance, which improved my country's formic acid production capacity. The overall process technology and equipment production level of salt. In the early 1990s, due to the international oil drilling using potassium formate to prepare drilling fluids, the drilling, well maintenance, and environmental...

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Problems solved by technology

[0009] Known Chinese patents: CN1704304A, CN1844074A, CN101125809A basically react formic acid with alkali metal oxides, hydroxides or corresponding salts, configure different equipment and processes to produce potassium diformate, and evaporate water out of the system after the reaction , to increase the content of potassium diformate, their reaction is basically an excess of formic acid, such a solution is difficult to separate water by evaporation: when formic acid and water evaporate, they will go from liquid phase to gas phase in the form of azeotropy and then condense, Cooling to obtain an aqueous solution containing formic acid, such a process loses formic acid and the steamed water is discharged under the pressure of environmental protection

U.S. Patent US6137005 (Chinese Publication CN1187807A) mainly reacts 80-95% formic acid with 70-80% potassium formate solution, separates and obtains crystalline potassium diformate and then dries it into a finished product, and then neutralizes the mother liquor with 50% potassium hydroxide Evaporate and remove water to obtain potassium formate solution with a content of 70-80%. Such a process loses the problem of cascade utilization of high-energy-carrying potassium hydroxide, and the corresponding energy consumption is consumed by an unavailable low-temperature heat source (thermal pollution), and the reaction is intense. Safety, the product is relatively single, and the discharge of evaporative process water causes environmental protection problems. The singleness of the existing patented technology limits its small-scale production capacity and environmental protection problems

[0010] Domestic patents believe that the cost of producing potassium diformate from formic acid and potassium formate is high. Potassium formate sold in my country before 2006 is basically a product synthesized from formic acid and potassium hydroxide. The cost is high and the price is not low. Use it to produce Potassium diformate also has no market competitiveness, let alone the popularization of potassium diformate as a feed additive

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