Novel xylidine and acetic acid waste gas recovery device and method

Abstract

The invention relates to a novel xylidine and acetic acid waste gas recovery device and method. The recovery device comprises a condensation type recovery device and an adsorption-type recovery device; the condensation type recovery device comprises a primary condenser and a secondary condenser which are communicated in sequence; the lower end of the secondary condenser is provided with a condensate recovery tank; the adsorption-type recovery device comprises an absorption tower and an activated carbon tank which are communicated in sequence; in a condensing period, a pre-condensation plus secondary condensation method is adopted, and meanwhile frosting of a condensation device are reduced and prevented as much as possible; xylidine and acetic acid mixed gas which is condensed and not recovered is subjected to cyclic spray settling by a tail gas absorber, and the gas running away to the upper part is subjected to adsorption treatment by the activated carbon tank. The novel xylidine and acetic acid waste gas recovery device and method have the advantages that the recovery utilization rate or organic matters such as acetic acid and xylidine is up to 99 percent or higher, activated carbon regeneration is thorough, the reuse rate is high, the service life is long, the operation cost is low, energy is saved, a process is simplified, and steam regeneration is not adopted.

Description

technical field [0001] The invention relates to the field of a water treatment agent, a metal surface treatment agent, a cleaning agent for the electronics industry, and a daily chemical additive, and in particular to a novel device and method for recovering waste gas of xyleneamine and acetic acid. Background technique [0002] Polyisopropylene phosphate is a water treatment chemical that integrates scale inhibition, dispersion, corrosion inhibition, and other properties, and has a broad application prospect. Its special properties have special uses in industrial circulating water treatment, oil field water injection, and medium and high pressure boilers. As far as the current production process is concerned, during the preparation process, a large amount of mixed gas of xylidine and acetic acid will be produced due to the high temperature reaction. [0003] Organic substances such as xylene and acetic acid are important chemical raw materials and an important part of fuel...

AI Technical Summary

Problems solved by technology

Chinese patent publication CN101683570A announces a toluene recovery and treatment device, which mainly relies on step-by-step deep cooling to cool and separate toluene. During the operation, the energy consumption of freezing is relatively high, and the vented air after freezing and separating cannot meet the corresponding emission standards, so it is directly vented It will still cause environmental pollution and waste of materials. At the same time, it is not applicable when the concentration of organic matter such as acetic acid or xylidine in the raw gas is low; the combustion method uses a catalyst to assist the combustion of the raw gas and then vents it. It is easy to cause environmental pollution due to insufficient combustion. At the same time, putting CO2 into the air during the combustion process will also cause damage to the atmosphere, and low-concentration raw gas is not suitable; the absorption method uses corresponding reagents to chemically react organic substances such as acetic acid or xylidine in the raw gas, and the whole process is irreversible. , organic matter such as acetic acid or xylidine cannot be effectively recovered, and the absorption rate of organic matter such as acetic acid and xylidine can only be about 90% at the same time, the absorption is not complete, and there is still environmental pollution in emptying; Chinese patent publication CN101077850A has announced a The method of recovering toluene adopts atmospheric pressure adsorption and steam desorption regeneration. Because of the normal pressure state, the corresponding adsorption and cooling equipment is relatively large, occupies a large area, and requires a large investment. At the same time, due to the use of steam regeneration, acetic acid, di Liquids such as toluidine contain other impurities such as water, and the recovered liquid can only be used after static stratification or even rectification. The recovery rate of acetic acid and xylidine is low, which can only reach about 85%. The difference in the permeation rate of the gas components on the hollow fiber membrane realizes the separation of the mixed gas. The pressure is the driving force of the gas permeation, so a large pressure difference is required, and a higher pressure needs to be added before the membrane. There is no pressure behind the membrane and energy loss Larger, higher energy consumption, and each component in the mixed gas is permeable, the air discharge cannot meet the standard discharge, and the service life of the membrane is very short, and the replacement cost is high

In summary, currently commonly used organic matter recovery devices such as acetic acid and xyleneamine generally have problems such as large investment, large area, harsh operating conditions, low recovery rate, high operating cost, unqualified emission indicators, low degree of automation, and long service life. Short and other defects

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