NMP gas recovery system and technology thereof

Abstract

The invention belongs to the technical field of industrial production waste gas recovery, and particularly relates to a recovery system for N-methyl pyrrolidone in lithium battery industrial waste gas treatment and a technology of the recovery system. The recovery system comprises a precooling and exchanging unit, a condensing unit, an adsorption and regeneration unit and an NMP waste liquor recovery tank which are sequentially connected, and the precooling and exchanging unit and the condensing unit are both connected with the NMP waste liquor recovery tank. Compared with the prior art, according to the NMP gas recovery system, equipment is simple, the technological process is short, no activated carbon adsorbent is used, eluting tower waste liquor is not generated, and the primary recovery rate of NMP can reach 99% or above; the production environment is effectively improved, personnel body health is prevented from being harmed, the cost of enterprise consumables is reduced, and the resource recovery utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of waste gas recovery from industrial production, and in particular relates to a recovery system for N-methylpyrrolidone in lithium battery industrial waste gas treatment and a process thereof. Background technique [0002] NMP (N-Methylpyrrolidone) is a colorless transparent oily liquid with a melting point of -24.4°C, a boiling point of 203°C and a flash point of 95°C; it has high flash point, low corrosion, high solubility, low viscosity, low volatility, heat The advantages of high stability and chemical stability. Because of its good physical and chemical properties, it is widely used in various industries. In general, NMP is mainly used in the following aspects: [0003] (1) Used as a solvent for polyvinylidene fluoride, etc., and as an auxiliary electrode material for lithium-ion batteries; [0004] (2) It can be used in the production of photoresist remover and LCD liquid crystal material; [0005...

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Problems solved by technology

However, the recovery system and its process have the following disadvantages and defects: 1) The recovery system is complicated, which makes the initial investment cost of the recovery equipment high, and the energy consumption and maintenance costs in the later period are also high; A large amount of polluted wastewater is produced, causing secondary pollution; 3) Activated carbon adsorbent is a consumable material that needs to be replaced continuously, resulting in increased operating costs and reduced production efficiency; 4) The recovery rate is low, and it is directly recycled in this process The NMP gas is about 75% of the total, and the remaining 25% NMP gas is directly discharged into the air, which does not meet the environmental protection requirements, causes damage to the environment and personnel, and is not conducive to energy saving and cost saving of enterprises

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