Method for purifying methyl isobutyl ketone exhaust gas in vacuum system using waste compressor oil

Abstract

The invention provides a method for purifying methyl isobutyl ketone (MIBK) exhaust gas of a vacuum system through utilization of waste air compressor oil and relates to a method for treating industrial organic exhaust gas. The MIBK gas produced in production is difficult to condense and reclaim at negative pressure; mass exhaust gas is discharged by a vacuum pump and enters atmosphere so as to cause serious pollution to environment; and discharged water containing the MIBK brings great difficulty for wastewater treatment. The method modifies a common water ring vacuum pump system and adds an inlet gas distribution pipe in a vacuum buffer tank; the tank is filled with waste air compressor oil; the method adds a circulating water pump and an engine oil saltless water tank; the engine oil saltless water tank is filled with saltless water and the waste air compressor oil; and the inside of the tank is provided with a cooling pipe coil. After the waste air compressor oil and low-temperature water are utilized to absorb the MIBK, gas exhaust of the water ring vacuum pump reaches the requirement of GB16297-1996. The method realizes cyclic utilization of water for the vacuum pump; the saturated waste air compressor oil is absorbed; and the MIBK is reclaimed by a distillation method so that the waste air compressor oil is regenerated.

Description

technical field [0001] The invention relates to a treatment method for organic waste gas in industrial production, in particular to a method for absorbing methyl isobutyl ketone (MIBK) waste gas in a vacuum system by using waste air compressor oil, and then recovering MIBK by distillation to make the waste air compressor Methods of oil regeneration. Background technique [0002] As an excellent medium boiling point solvent, MIBK is widely used as an extraction agent for the extraction and synthesis of antibiotics such as penicillin, 6-aminopenicillanic acid, and tiamulin, and as a solvent in the crystallization process. Due to the strong heat sensitivity of antibiotics, drug extraction, concentration in the synthesis process, and drying operations in the crystallization process are mostly completed in a vacuum state and at a relatively low temperature. The commonly used water ring vacuum pump exhaust system consists of a vacuum buffer tank, a water ring vacuum pump, and a g...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering MIBK gas from the exhaust system of the water ring vacuum pump by using waste air compressor oil, so as to solve the problem that the exhaust of the water ring vacuum pump system contains a large amount of MIBK gas and seriously pollute the environment. The gas index meets the requirements of the "Comprehensive Emission Standard of Air Pollutants" (GB16297-1996); realizes the recycling of water for water ring vacuum pumps, saves water resources, and reduces sewage treatment costs

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