A kind of harmless treatment method of acrylic acid and its ester waste liquid

Abstract

The invention discloses an innocent treatment method for acrylic acid and ester waste liquid thereof. The innocent treatment method comprises the following steps of performing steam tracing on the acrylic acid and the ester waste liquid thereof; feeding steam in the acrylic acid and the ester waste liquid thereof; directly mixing the steam, the acrylic acid and the ester waste liquid; spraying the mixture into an atomizer at an angle of 10-40 degrees; performing atomization by using the steam as an atomizing medium; incinerating the mixture; performing denitration, waste heat recovery, desulfuration and dust removal treatment on smoke generated during incineration; recycling heat from waste heat of the smoke to generate steam; and recycling the steam in a production line. By the innocent treatment method for the acrylic acid and the ester waste liquid thereof, atomization, incineration, denitration, waste heat recovery, dust removal and desulfuration are integrated creatively and are controlled full-automatically, the labor intensity is low, the energy consumption is reduced obviously during operation, smoke emission is far lower than the national emission standard, and the practicality and the economic benefit are quite high.

Description

technical field [0001] The invention relates to a harmless treatment method for acrylic acid and its ester waste liquid. Background technique [0002] With the rapid development of the chemical industry, the shortage of energy resources such as petroleum and coal, and the increasingly serious problems of environmental pollution and greenhouse effect, the energy saving and consumption reduction of the acrylic acid industry have become the key to the survival and competitiveness of enterprises, and are increasingly affected by All aspects of attention; acrylic acid and its esters (methyl ester, ethyl ester, butyl ester, isooctyl ester) unit production and operation of high boilers of acrylic acid and ester waste liquid are produced, at 200 ℃ from the production line reactor The high-boiling substance has good fluidity, but after the temperature is lowered, it is in a solid state of asphalt, and its environmental risks in storage, transportation and transfer are also greatly in...

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Problems solved by technology

[0002] With the rapid development of the chemical industry, the shortage of energy resources such as petroleum and coal, and the increasingly serious problems of environmental pollution and greenhouse effect, energy saving and consumption reduction in the acrylic acid industry have become the key to the survival and competitiveness of enterprises, and are increasingly popular. Pay attention to all aspects; Acrylic acid and its esters (methyl ester, ethyl ester, butyl ester, isooctyl ester) are produced during the production and operation of the acrylic acid and ester waste liquid. The fluidity of the high-boiler that comes out is better, but after the temperature is lowered, it becomes asphalt solid, and its environmental risks in storage, transportation and transfer also increase significantly

[0003] At present, acrylic acid and its ester waste liquids are mostly incinerated directly by solids or incinerated in horizontal furnaces with heat tracing. The copper salt in the furnace incineration waste liquid cannot be collected, and it is difficult to achieve better results in terms of combustion efficiency and destruction removal rate; moreover, the harsh working conditions and high operating intensity cause great harm to the environment and operators, which also restricts the acrylic acid industry. continuous development of

[0004] Chinese patent CN201320887981 provides an acrylic acid waste liquid incineration system, which includes a waste liquid incinerator, an economizer and a chimney. The waste liquid is preheated, and the waste liquid enters the incinerator after being atomized by steam. After the incinerator is fully burned, it enters the economizer from the incinerator outlet, and the heat can be recycled, saving the cost of waste liquid treatment; however, for acrylic acid And the sulfur dioxide and nitrogen oxides generated by the combustion of sulfur and nitrogen in the polymerization inhibitor (phenothiazine C12H9NS, copper salt C18H36N2S4Cu, p-toluenesulfonic acid C7H8O3S, polymerization inhibitor C9H18NO2) in the ester waste liquid have not been treated in any way , and the direct emissions of sulfur dioxide and nitrogen oxides will bring direct pollution to the atmosphere

However, the removal rate can only reach 80%, the efficiency is low, and the economic benefit is poor without waste heat recovery, and it can no longer meet the increasingly stringent environmental protection emission requirements

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