Tail gas treatment method of chlorohydrin method propylene oxide plant

Abstract

In the chlorohydrin method propylene oxide device tail gas treatment method of the present invention, the chloroalcoholization of organic waste gas in the propylene oxide device removes acid gas through an alkali washing tower; After the supplementary air is mixed, it enters the fan together; the gas in the outlet pipeline of the fan is detected by the VOC online gas detector to detect the combustible gas content, and then it is measured by the remote flowmeter and then transported to the safety water-sealed tank of the caustic soda device; then enters the molten salt furnace as a combustion-supporting air Incineration is performed and includes interlock control methods to ensure safety on the job. This process is to dilute the tail gas in a large amount to reach below 25% of the explosion limit concentration of each component of the tail gas, and then incinerate as the combustion-supporting air of the incinerator, which is not only safe in operation, but also can completely and effectively treat the waste gas. It can even recover heat or save fuel usage.

Description

technical field [0001] The invention provides a method for treating tail gas of a propylene oxide plant by a chlorohydrin method, which is applied to a chemical plant producing organic waste gases such as alkanes, olefins, and alkynes. Background technique [0002] Existing tail gas treatment technologies are as follows: [0003] 1. Adsorption method: mainly use adsorbents, such as activated carbon, to adsorb organic tail gas, and replace the adsorbents regularly. However, in this method, the adsorbent needs to be supplemented and regenerated; the exhaust gas with high temperature needs to be cooled first; the complex exhaust gas needs to be pretreated. [0004] The main disadvantage of this method is that it needs to be operated under certain pressure conditions. For the tail gas of the chlorohydrin method propylene oxide plant, the concentration of oxygen in the tail gas is about 45%. If the tail gas is compressed, there will be an explosion. danger. Secondly, if the de...

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Problems solved by technology

[0011] In order to solve the defects in the prior art, such as potential safety hazards, need for secondary treatment, and incomplete purification, the present invention provides a method for treating the tail gas of a propylene oxide plant by chlorohydrin method, which solves the problems of organic waste gases such as alkanes, alkenes, and alkynes in chemical plants. Pollution problems caused by emissions

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