A high-efficiency spraying solvent recovery system and its process

Abstract

The invention discloses a high-efficiency spraying solvent recovery system and a process thereof. An absorption tower model of the chemical industry is adopted to absorb an NMP solvent in gas by water. The NMP solvent-containing gas discharged by a coating or drying device can achieve solvent recycling through a gas-gas heat exchanger and a secondary cooling absorption tower of the recovery system. By means of complete recycling of the solvent, the circumstance of air pollution caused by redundant exhaust gas emission can be avoided really, so that the benefits of environmental protection can be further improved effectively. The system and process provided in the invention have the notable advantages of: 1. low operation energy consumption, less than 23kw.h of power consumption for treating every ten thousand standard cubic gas; 2. low NMP content in tail gas, about less than 30ppm; 3. no reflux of liquid and no pipeline leak; 4. less running equipment and reduced maintenance cost; and 5. full utilization of thermal energy in hot wind.

Description

technical field [0001] This patent relates to a system and process for recovering NMP (N-methylpyrrolidone) solvent in a closed-loop drying gas. By forming a closed loop between the coating or drying device and the recovery process, Background technique [0002] NMP (N-Methylpyrrolidone) is a high-efficiency selective solvent, which has the advantages of non-toxicity, high boiling point, low corrosion, high solubility, low viscosity, low volatility, good stability, and easy recovery. It has a wide range of uses in various industries, mainly in the following aspects: [0003] (1) NMP is used as a solvent for polyvinylidene fluoride, etc., and as an electrode auxiliary material for lithium-ion batteries. [0004] (2) It can be used in the production of photoresist remover and LCD liquid crystal material; [0005] (3) Solvents used in pharmaceutical production; [0006] (4) Cleaning of precision instruments and circuit boards in the semiconductor industry. [0007] When NM...

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Problems solved by technology

[0012] The disadvantages of this process are: 1. The energy consumption is large, and the power consumption per 10,000 standard cubic meters of gas is about 40kw.h; 2. The NMP content in the tail gas is high, above 80ppm; 3. The liquid is easy to flow back into the air duct, causing A large amount of leakage; 4. There are many operating equipment, high noise and high maintenance costs

[0016] The disadvantages of this process are: 1. Since the complete set of equipment needs to be imported, the equipment investment is large; 2. The energy consumption is large, and the power consumption for processing every 10,000 standard cubic meters of gas reaches 45kw.h

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