Process for preparing granular patassium formate and its pelletizing equipment

Abstract

The present invention belongs to the field of chemical production technology. Gaseous CO is led into potassium hydroxide solution, and through reaction at the conditions of 150-230 deg.c temperature and 1.7-4.0 MPa pressure, dilute solution of potassium formate is obtained. Further, the solution is evaporated at 150-200 deg.c and normal pressure, airflow cooled at 110-180 deg.c, crystallized and palletized to obtain potassium formate product. The pelletizing equipment includes one cylinder with material inlet in the top, inside gas nozzle connected to a tubular adsorber and material vibrator in the lower part; one spiral pressure conveyer connected to the bottom of the cylinder; and exhauster connected to the top opening of the cylinder via pipe. The preparation process of granular potassium formate has simple path, high potassium formate content in the product and controllable product granularity; and the novel pelletizing equipment may be used also for pelletizing other material.

Description

(1) Technical field [0001] The invention relates to a preparation method of potassium formate and granulation equipment thereof, belonging to the technical field of one-carbon chemical production. (2) Background technology [0002] Potassium formate, as an internationally known product, is being vigorously promoted and applied abroad, mainly in the oil drilling industry, and is also being researched and applied in some fine chemical fields, such as the rubber additive industry and the refrigeration industry. However, the application of potassium formate in my country is still in the promotion stage, and the application market will continue to expand. [0003] There are mainly three methods for the production of potassium formate in industry: one is to produce potassium formate products by acid-base reaction. The products produced by this method are relatively pure, but the price is very expensive. It is uneconomical to use as an industrial product and can only be used as an ...

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Problems solved by technology

[0003] There are mainly three methods for the production of potassium formate in industry: one is to produce potassium formate products by acid-base reaction. The products produced by this method are relatively pure, but the price is very expensive. It is uneconomical to use as an industrial product and can only be used as an analytical reagent.

The second method is salt production method, that is, the reaction of formic acid and potassium carbonate to produce potassium formate products. Domestic manufacturers have been using this method to produce a small amount of potassium formate products in the past few years. In the past two years, they have stopped production due to high production costs. , Practice has proved that this method is also uneconomical as an industrialized production

The third method is the method of double decomposition to produce potassium formate. Potassium sulfate is produced first: potassium chloride reacts with sulfuric acid to produce potassium sulfate, and then reacts potassium sulfate with formic acid to produce potassium formate. Causes a lot of pollution, industrial production is not economical, and does not meet environmental protection requirements

Potassium formate produced by this production process has many impurities and complicated purification, and has no great practical value

CN1273962A discloses a kind of synthesis technique of potassium formate, but there are two deficiencies in this technique, the one, the purity requirement to raw material carbon monoxide gas is higher, makes purification cost high; Poor fluidity, which is not conducive to the industrial application of the product

But the potassium formate product that this method makes is difficult to satisfy user's requirement to the shape and granularity of potassium formate product

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