Ethyl acetate recovery method using activated carbon adsorption combined with rotor adsorption

Abstract

The invention provides a method for recovering ethyl acetate by combining activated carbon adsorption with rotor adsorption. By combining more than three adsorbers and rotor adsorbers, the ethyl acetate in the tail gas system with medium and high concentrations can be recovered. The adsorption rate increased to over 99.5%. The primary activated carbon tank after adsorption saturation is firstly adsorbed by the secondary activated carbon tank to enrich the solvent and complete the regeneration of the primary activated carbon tank. liquefaction recovery. The ethyl acetate adsorbed by the runner is regenerated by hot air and returned to the inlet of the exhaust system to complete the regeneration of the runner. In this method, activated carbon is combined with rotor adsorption, while ensuring that the tail gas is discharged up to the standard, it realizes the cycle regeneration of the system, and greatly improves the recovery rate of the solvent.

Description

technical field [0001] The invention relates to a method for recovering ethyl acetate by combining activated carbon adsorption and rotor adsorption. The activated carbon is enriched by a secondary tank, regenerated by hot inert gas, and refrigerated water is used to condense the regenerated gas, especially for insulating materials, Treatment of organic waste gas in reflective materials and printing industry. Background technique [0002] 201210299494.9 Use single-stage activated carbon to adsorb organic waste gas, which is suitable for the adsorption treatment of low- and medium-concentration tail gas. After the activated carbon is adsorbed for a certain period of time and the emission concentration reaches the predetermined value, the emission will not meet the standard. The adsorption switching period of activated carbon is short. When the saturation degree of activated carbon is low, the utilization rate of activated carbon is low; the activated carbon regeneration proces...

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Problems solved by technology

[0005] Design purpose: To avoid the deficiencies in the background technology, adopt the ethyl acetate recovery method combining activated carbon adsorption and rotor adsorption to solve the problems existing in the background technology: first, only use activated carbon to adsorb organic waste gas, and use activated carbon to adsorb After a certain period of time, when the emission concentration reaches a predetermined value, there will be a problem that the emission does not meet the standard. The switching cycle of activated carbon is short, the saturation degree of activated carbon is low during switching, the utilization rate of activated carbon is low, and frequent adsorption and desorption also increase the recovery of solvents. The second is to use the combination of activated carbon and rotor adsorption to recover the solvent. If steam is used to regenerate the activated carbon, a large amount of waste water will be generated, causing secondary pollution and increasing the cost of sewage treatment; and the recovery of steam desorption The energy consumption is also high; and the activated carbon tank uses air to cool the high-temperature bed during cold blowing and drying, which has a high risk of fire in the bed and poor safety; third, only the zeolite runner is used for adsorption and concentration of organic waste gas. The scope of application is narrow, and only low-concentration organic waste gas can be treated. If medium and high-concentration waste gas is treated, the emission will not meet the standard; and the regeneration gas of the runner is not recovered, but burned, which is economical.

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