Method for producing potassium formate

Abstract

The invention relates to a method for producing potassium formate. The method comprises the following steps of: enriching potassium by taking seawater, bittern or potassium-containing brine as raw materials and natural clinoptilolite as an inorganic ion adsorbent, ejecting the raw materials in the absorbent subjected to absorption saturation by water, and eluting the absorbent by sodium formate solution to prepare potassium-enriching liquid; and distilling and concentrating the potassium-enriching liquid twice, and performing centrifugal separation to prepare a 75 percent industrial liquid potassium formate finished product or distilling and concentrating the liquid potassium formate, cooling, crystallizing, and performing the centrifugal separation to obtain a solid potassium formate product, wherein the natural clinoptilolite which is eluted and regenerated can be recycled, and wastewater and wet sodium formate which are formed in the reaction process can be recycled. Compared with the prior art, the method has the advantages that: sources of the raw materials are wide, and the method is low in cost and environment-friendly, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for producing potassium formate, in particular to a method for producing potassium formate with seawater, bittern or other potassium-containing brine as raw materials. Background technique [0002] Potassium formate is an important chemical raw material. It is mainly used to prepare oilfield drilling fluid and completion fluid, camouflage acid (masking agent) in chromium tanning process, and to manufacture carbon black surface modifier, deicing agent, mine Mining, etc., used as a reducing agent in the printing and dyeing industry, and now it is also widely used in the production of potassium diformate for feed. [0003] The method of producing potassium formate at present mainly contains following several kinds: (1) double decomposition method: this process reaction is gentle, and production equipment is simple, pollution-free, but because the product is mixed state after the reaction finishes, want to obtain the potas...

AI Technical Summary

Problems solved by technology

[0003] The method of producing potassium formate at present mainly contains following several kinds: (1) double decomposition method: this process reaction is gentle, and production equipment is simple, pollution-free, but because the product is mixed state after the reaction finishes, want to obtain the potassium formate of higher purity, also Requires a relatively complex purification process, resulting in high cost and low quality

(2) Potassium hydroxide and carbon monoxide high-pressure synthesis method (CN00112814.0 and CN03120711.1): This method can utilize a part of waste gas containing CO to reduce environmental pollution, but the raw material cost of potassium hydroxide is relatively high, and in order to produce the reaction required The temperature and pressure conditions need to consume a lot of energy, which is a high energy consumption method

(3) Acid-base neutralization method: the method includes potassium hydroxide and formic acid neutralization method, potassium carbonate and formic acid neutralization method, and potassium bicarbonate and formic acid neutralization method. These three methods have the advantages of simple process and easy operation. advantages, but the above methods all use volatile and corrosive formic acid as a raw material, resulting in high production costs, serious pollution, high equipment cost and workers are vulnerable to poisoning

(4) Chinese patent CN200610012740 discloses a method for producing potassium formate with cation exchange resin as a reaction carrier. The method does not produce harmful substances, does not pollute the environment, and has a high degree of crystallization and good quality, but the raw materials used are 15%-30 % KCl solution, the raw material price is higher, resulting in an increase in the cost of the product

(5) European patent EP0769000B1 and Chinese patent CN200780050021.1 disclose a kind of method with a certain proportion of formaldehyde, potassium hydroxide and isobutyraldehyde in water at a certain temperature to produce potassium formate, the method gained product has high purity, but Due to the use of organic solvents formaldehyde and isobutyraldehyde, it is easy to cause environmental pollution