Method for preparing high-purity sodium formate by using tail gas of synthesis ammonia liquid nitrogen wash device

Abstract

The invention provides a method for preparing high-purity sodium formate by using tail gas of a synthesis ammonia liquid nitrogen wash device. The method comprises the following steps that: the tail gas generated by the synthesis ammonia liquid nitrogen wash device is compressed to a proper pressure by a compressor, the compressed tail gas is mixed with sodium hydroxide liquid conveyed by using a liquid alkaline pump, and the mixture is preheated and then enters a synthesis reactor to react to generate qualified diluted sodium formate; and the generated diluted sodium formate solution is concentrated in an evaporating manner, centrifugally separated and dried with air to obtain the high-purity sodium formate with the purity being above 99 percent. The method provided by the invention solves the problem that the tail gas of the synthesis ammonia liquid nitrogen wash device is used as a combustion gas, is low in recycling value and pollutes the environment, and solves the defects of lagging production equipment of the traditional sodium formate production process, high production cost caused by using coke or lump coal as a raw material, environment pollution, small yield, low purity of the sodium formate, and the like, and has the advantages of low energy consumption, low production cost, high purity of the sodium format, large scaling, no pollution and adjustable yield.

Description

technical field [0001] The invention relates to the field of synthesis of fine chemical materials, in particular to a method for preparing high-purity sodium formate by using the tail gas of a synthetic ammonia liquid nitrogen washing device. Background technique [0002] The chemical formula of sodium formate is HCOONa·2H2O, and the molecular weight is 104.04. The density is 1.919g / cm3. Slight formic acid smell. Soluble in water and glycerin, slightly soluble in ethanol. The melting point is 253°C. Industrial sodium formate is often used in the leather industry, as camouflage acid in chromium tanning; used as catalyst and stable synthetic agent; reducing agent in printing and dyeing industry; also used in the production of sodium hydrosulfite, oxalic acid and formic acid; in recent years, it has also been widely used in cement early Strong and formulated low-toxic, environmentally friendly oilfield drilling fluid. [0003] At present, the process methods for producing ...

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Problems solved by technology

This process not only solves the problem that the liquid nitrogen washing tail gas of the ammonia synthesis plant is only used as combustion gas and has low recovery value and pollutes the environment, but also solves the problems of backward production process equipment for sodium formate, high production costs of coke or lump coal as raw materials, environmental pollution, and equipment With many deficiencies such as small production capacity and low product purity, it provides a low energy consumption, low production cost, high product purity (sodium formate content can reach more than 99%), large-scale equipment, no environmental pollution, and production can be based on market demand. The production method of high-purity sodium formate flexibly adjusted

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