| abstract |
The invention provides a method for producing formic acid by comprehensively utilizing coal-to-ethylene glycol MF waste liquid, and relates to the technical field of treatment of coal-to-ethylene glycol MF waste liquid. The invention adopts a multi-tower step-by-step separation method to gradually and respectively purify MN, ME, ML and MF in the waste liquid of the coal-to-ethylene glycol MF; the MN removal tower is operated at high pressure; the MF purification tower adopts positive pressure operation; mixing the purified MF and desalted water, performing hydrolysis reaction in a hydrolysis tower, performing autocatalytic hydrolysis on the MF to generate a mixture of formic acid and ME, and sending the mixture to an MF recovery tower, wherein the reaction condition is mild, the flow is short, the conversion rate is high, and the consumption is greatly reduced; the methanol recovery tower adopts bottom circulation heating, ME is extracted from the middle side of the tower, ML is extracted from the top of the tower, and the equipment which is originally designed into two towers is combined into one, so that the cost is saved. The invention extends the product chain of the ethylene glycol prepared from coal, ensures the complete recovery and zero discharge of all byproducts, solves the environmental protection problem and major potential safety hazard, ensures the full-load production of a system and brings great economic benefit. |