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Formic Acid Plants and Formic Acid machine Jiangsu Hengmao Manufactures

Features

1) Simple process by adopting successive oxidation from methanol to formaldehyde, and then to formic acid
2) Low investment
3) Low methanol consumption: ***5 Kg methanol for per ton of **0% formic acid
4) High purifying rate for waste water and gas: *8%

Process Flow

Formic Acid equipment is operated according to the following 8 steps:

â‘´ Methanol vaporization and mixing with air.

⑵ Oxidation of methanol vapor.

⑶ Reaction mixture cooling.

â‘· Formaldehyde oxidation

⑸ Formic gas cooling to *5% concentration

⑹ Offgas purification under catalysis

⑺ Diisopropyl ether as a azeotropic mixture to concentrate formic acid from *5% to *5% via fractionation

â‘» Fractionation of aqueous diisopropyl ether solution

Process Details

Before entering blower from the formic acid production line, air must be filtrated through air filter. Clean air and methanol through pre-heater and evaporator are mixed and then is directly sent to oxidation reactor (The gas from reactor outlet is heated and sent to oxidation section). Methanol is oxidized in the reactor under metal oxidant catalyst. The reaction equations are shown as below:

Main Reaction:

СН3ОН + 1/2 О2 = НСНО + Н2О

Side Reactions:

2СН3ОН = СН3ОСН3 + Н2О

СН3ОН + О2 = СО + 2Н2О

Formic acid production line last workflow: the heat generated from oxidation reaction is cooled by oil in the reactor jacket; while the generated steam is removed by separator. The resultant formaldehyde is oxidized by oxygen contained mixing gas to form formic acid in the two continuous reactors. The reaction heat is removed by water. *5% formic acid gas is cooled by condenser wherein water and glycol serve as cooling medium. The tail gas prior to atmospheric emission must take conversion treatment, after which *8% gas purity can be reached. *5% formaldehyde condensate is sent to fraction distillation column. Also diisopropyl ether is supplied to the top of the fraction distillation column as a azeotropic mixture. Through fractionation, formic acid is concentrated to *5%. The diisopropyl ether is recovered, purified and returned to the system, while waste water is treated before discharge.