Continuous producing method and device for formic acid

Abstract

The invention discloses a method for constantly producing formic acid and a device thereof, which comprises steps of adding raw materials by measuring, reaction, conveying and evaporation. The device comprises a charging stock tank of acidulant, a charging stock tank of acidizing additive, a charging stock tank of sodium formate, a first reactor, conveyer auger, a second reactor, a receiving tank of acidizing additive and a receiving tank of salt materials. Because the invention provides a method for constantly producing formic acid and the device to carry out the method, the conventional mode of production is changed completely, and reactants can be conveyed to an evaporation system, without waiting for finishing acidification reaction, thereby combining two steps of reaction and evaporation organically. The invention not only simplifies the operation, but also improves the production capacity of formic acid. Each unit of the formic acid production line can produce 1000 tons formic acid in one year. Further, the invention can decrease the loss of materials and energy, and deduce the cost.

Description

technical field [0001] The invention relates to a method and a device for preparing formic acid by acidifying sodium formate, in particular to a method and a device for continuously producing formic acid. Background technique [0002] Formic acid is commonly known as formic acid, molecular formula: HCOOH, molecular weight: 46.02, is a colorless, fuming, flammable liquid with a pungent odor, and is highly corrosive. Formic acid is miscible with water, ethanol, ether, glycerin, etc. Specific gravity 1.2201, melting point 8.3. Formic acid is one of the basic organic chemical raw materials. It can be directly used in fabric processing, leather tanning, textile printing and dyeing, and green fodder storage. It can also be used as metal surface treatment agent, rubber auxiliary agent and industrial solvent. In organic synthesis, it is used to synthesize various formic acid esters, acridine dyes and formamide series pharmaceutical intermediates. It is widely used in industries su...

AI Technical Summary

Problems solved by technology

This intermittent production of formic acid greatly limits the production capacity of formic acid, making it unsuitable for large-scale production. At the same time, the operation is complicated and the preparation cost is increased.

[0004] Chinese Patent No. 97103209.2 discloses "Using superphosphoric acid to acidify sodium formate to produce formic acid and co-produce various sodium phosphate salts", 200610046124.9 discloses "formic acid production process", 200610124470.4 discloses "Using phosphoric acid and sodium formate to produce formic acid method", 200610200857.3 discloses "A production method for 95% high-concentration formic acid" published in 200710200045.3 "A method for producing formic acid by acidifying sodium formate with orthophosphoric acid", without exception, are all batch production methods. way, each set of formic acid production line can produce about 1,000 tons of formic acid per year, which greatly limits the production capacity of formic acid

Images