Method for producing sodium formate by using coal gas

Abstract

The invention discloses a method for producing sodium formate by using coal gas. The method comprises the steps that: a production raw material liquid is prepared; coal gas is added to the raw material liquid, and a synthesis reaction is carried out, such that a reaction product liquid is obtained; and sodium formate in the reaction product liquid is evaporated, crystallized, separated, dried, and packaged. According to the invention, a limitation of a low concentration of produced sodium formate is broken. Under a condition that current raw material concentration, reaction temperature and reaction pressure are not changed, the concentration of sodium formate in the reaction product liquid is no lower than 500g / L, such that vapor consumption is saved. Also, with a method that formic acid is added, the purity of sodium formate is higher than 99.5%. Also, evaporation, crystallization, drying and packaging manners are changed, such that sodium formate is prevented from moisture absorbing and caking. With the method provided by the invention, apparatus productivity is greatly improved, vapor consumption is reduced, system operation stability is improved, continuous production is realized, and product quality is improved. Therefore, economic, environmental and social benefits are ensured.

Description

technical field [0001] The present invention relates to a kind of method of producing sodium formate, particularly a kind of method of synthetic method producing sodium formate. Background technique [0002] Sodium formate, molecular formula: HCOONa, molecular weight: 68.01, white granular or crystalline powder. Slight formic acid smell, hygroscopic. At high temperature, it decomposes into sodium oxalate and hydrogen, and then generates sodium carbonate. Soluble in about 1.3 parts of water, soluble in glycerin, slightly soluble in ethanol, its aqueous solution is neutral, pH is 7, relative density is 1.92. The melting point is 253°C. irritating. Commodities often contain 2 molecules of crystal water. Uses: leather industry, camouflage acid in chrome tanning process; used as catalyst and stable synthetic agent; reducing agent in printing and dyeing industry; used in the production of hydrosulfite, oxalic acid and formic acid. [0003] Synthetic method is a common method...

AI Technical Summary

Problems solved by technology

[0006] The second is that the gas contains a small amount of carbon dioxide, which generates sodium carbonate when the gas and caustic soda are synthesized, and the caustic soda contains a small amount of sodium carbonate and sodium chloride. These impurities follow the sodium formate synthesis liquid into the sodium formate evaporation stage, because they are not easy to separate. Therefore, entering the product restricts the purity of the sodium formate product

[0007] The third is that sodium formate evaporation and drying technology generally adopts single-effect or double-effect intermittent evaporation technology for production, and airflow drying technology is used for drying after centrifugation. Since sodium formate is a supersaturated solution, the saturated solution of sodium formate crystallizes during the intermittent production process, causing serious blockage Due to the uncontrollable drying time of air-flow drying, the pipeline and equipment are often blocked when the drying is not complete; at the same time, the moisture content of sodium formate after air-flow drying is unstable, which makes packaging difficult and easy to handle. In short, the output and quality of sodium formate are seriously affected and the operating cost is high

Images