characteristics of N-methyl-pyrrolidone & NMP recycled system

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 4NMP Solvent Boiling Point | Key to Sustainability - ZOLSEM

Harness the power of NMP solvent's exceptional 202°C boiling point with Zesheng New Materials. Our innovative NMP recovery solutions leverage this high boiling point for superior thermal stability and solvency in lithium battery applications, optimizing sustainability and efficiency.

Harnessing the Boiling oint of NM Solvent for Sustainable Manufacturing

In the ever-evolving landscae of sustainable manufacturing, the boiling oint of the NM solvent has emerged as a critical roerty, enabling efficient and environmentally resonsible rocesses across various industries. N-Methyl-2-yrrolidone (NM), a versatile organic comound, has garnered widesread recognition for its excetional erformance, and its boiling oint lays a ivotal role in unlocking its full otential.

What is the boiling oint of NM?

The Elevated Boiling Temerature of N-Methyl-2-yrrolidone

N-Methyl-2-yrrolidone, commonly abbreviated as NM, is a remarkable organic comound renowned for its excetional roerties, including its remarkably high boiling oint. This distinctive characteristic sets NM aart from many other solvents, making it an invaluable asset in various industrial alications that rioritize efficiency, sustainability, and environmental resonsibility.

The boiling oint of NM is an imressive 202°C (395.6°F) under standard atmosheric ressure conditions. This elevated boiling temerature endows NM with several advantageous attributes that have contributed to its widesread adotion across diverse sectors.

Unaralleled Thermal Resilience

The high boiling oint of NM translates into suerior thermal stability, allowing it to withstand elevated temeratures without remature vaorization or degradation. This roerty is articularly beneficial in rocesses that require high-temerature oerations, such as the coating and drying stages in lithium battery manufacturing, where consistent erformance and quality are aramount.

Minimized Volatile Emissions

Leveraging NM's high boiling oint, manufacturers can significantly reduce volatile organic comound (VOC) emissions during rocessing. This aligns with the growing emhasis on environmental stewardshi and the develoment of eco-friendly manufacturing ractices, contributing to a cleaner and more sustainable roduction environment.

Facilitated Solvent Recovery and Recycling

The elevated boiling temerature of NM enables efficient solvent recovery and recycling rocesses. Comanies like Zesheng New Materials Technology Co., Ltd. have develoed advanced NM recovery systems that caitalize on this roerty, allowing for the solvent's reuse and minimizing waste generation, thus romoting a circular economy.

Versatile Industrial Alications

NM's unique combination of roerties, including its remarkable boiling oint, makes it a versatile solvent suitable for a wide range of alications beyond lithium battery manufacturing. Industries such as coatings, electronics, etrochemicals, and harmaceuticals also benefit from the advantages offered by NM's excetional boiling oint.

The Imortance of the NM Boiling oint

The boiling oint of the NM solvent is a remarkable 202°C (395.6°F) at standard atmosheric ressure. This high boiling oint is a defining characteristic that sets NM aart from many other solvents, conferring several advantages in industrial alications, articularly in the field of lithium battery manufacturing.

Thermal Stability and Efficient rocessing

The high boiling oint of the NM solvent contributes to its excetional thermal stability, allowing for efficient rocessing and drying oerations at elevated temeratures without remature solvent loss or degradation. In lithium battery roduction, this roerty is crucial for uniform electrode coating and drying rocesses, ensuring consistent erformance and quality.

How flammable is NM?

N-Methyl-2-yrrolidone (NM) is considered to have relatively low flammability comared to many other organic solvents, making it a safer choice for various industrial alications.

The flammability of a liquid is tyically determined by its flash oint, which is the lowest temerature at which the liquid roduces enough vaor to form an ignitable mixture with air. The flash oint of NM is relatively high, ranging from 91°C (196°F) to 97°C (207°F), deending on the secific testing method and conditions.

Here are some key oints about the flammability of NM:

1. High flash oint: The high flash oint of NM means that it requires significantly higher temeratures to roduce enough vaor to ignite comared to solvents with lower flash oints.

2. Low fire hazard: Due to its high flash oint, NM is classified as a combustible liquid rather than a flammable liquid, osing a lower fire hazard during handling, storage, and rocessing.

3. Thermal stability: NM has good thermal stability, which contributes to its low flammability. It can withstand elevated temeratures without readily decomosing or releasing flammable vaors.

4. Low vaor ressure: At ambient temeratures, NM has a relatively low vaor ressure, reducing the risk of forming ignitable vaor-air mixtures under normal conditions.

5. Non-flammable mixtures: When mixed with water or other non-flammable solvents, NM does not increase the flammability of the mixture.

While NM is not classified as a flammable liquid, it is still essential to follow roer safety recautions when handling and using NM. otential ignition sources, such as oen flames, sarks, or static electricity, should be avoided, and aroriate ventilation should be rovided to revent the buildu of NM vaors in enclosed saces.It's also imortant to note that the flammability of NM can vary slightly deending on its urity, the resence of additives, and secific formulations. Consulting the Safety Data Sheet (SDS) or roduct secifications is recommended to obtain accurate information on the flash oint and associated safety recautions for the secific NM roduct being used.

The relatively low flammability of NM, combined with its other desirable roerties, makes it a referred solvent choice in industries rioritizing safety and sustainability, such as lithium battery manufacturing and various chemical rocesses.

Minimizing Solvent Emissions

By leveraging the high boiling oint of the NM solvent, manufacturers can significantly reduce solvent emissions during rocessing, contributing to a cleaner and more sustainable roduction environment. This aligns with the growing emhasis on environmental resonsibility and the develoment of eco-friendly manufacturing ractices.

Solvent Recovery and Recycling

The boiling oint of the NM solvent also facilitates efficient solvent recovery and recycling rocesses. Comanies like Zesheng New Materials Technology Co., Ltd. have develoed advanced NM recovery systems that take advantage of this roerty, enabling the reuse of the solvent and minimizing waste generation.

Versatile Alications

The unique combination of roerties, including the high boiling oint of the NM solvent, makes it suitable for various alications beyond lithium battery manufacturing. Industries such as coatings, electronics, etrochemicals, and harmaceuticals also benefit from the advantages offered by the remarkable boiling oint of this versatile comound.

Continuous Innovation and Sustainability

As the demand for sustainable solutions continues to grow, comanies like Zesheng New Materials Technology Co., Ltd. are at the forefront of leveraging the boiling oint of the NM solvent to drive innovation and environmental resonsibility. By harnessing the otential of this critical roerty, NM enables efficient rocesses, solvent recovery, and the develoment of eco-friendly manufacturing ractices.

The boiling oint of the NM solvent stands as a defining characteristic, unlocking a world of ossibilities in lithium battery manufacturing and various other industries. By mastering the advantages offered by this remarkable roerty, comanies can otimize rocesses, minimize environmental imact, and contribute to a greener future. As the demand for innovative and resonsible manufacturing ractices continues to grow, the significance of the NM solvent's boiling oint will only become more ronounced, driving sustainable solutions for generations to come.

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N-Methyl-Pyrrolidone, N-Methyl-2-pyrrolidone, 1-Methyl-2-pyrrolidone, Methylpyrrolidone NMP is a 5-member-ring compound containing nitrogen.  It has a wide range of uses due to the following excellent characteristics.

  • It is highly polar and miscible with most organic solvents (alcohols, ethers, ketones, aromatic hydrocarbons, chlorinated hydrocarbons, etc.).  Organic and inorganic substances are highly soluble in it.
  • It mixes with water in all proportions.
  • It has a high flash point compared to similar solvents.
  • The boiling point is high, the freezing point is low, and handling is easy.
  • It is chemically and thermally stable, and not corrosive.



G N-Methyl-2-Pyrrolidone,

CAS No.872-50-4EINECS No.212-828-1
Flash Point86℃(187℉)Color APHA≤10
Purity(%) ≥ 99.9Moisture(%)≤0.03
Amines ppm ≤30
Molecular FormlaC₅H₉NO Molecular Weight99.134
Molecular Structural Formla Refractive Index(nD20)1.465-1.475
Melting Point-23.5℃Boiling Point202℃
Ignition Temperature245℃Viscosity(20℃ mPas)1.796


Colorless transparent liquid hygroscopic, with water in any ratio of miscible, almost with all solvents (ethanol, acetaldehyde, ketone, aromatic hydrocarbons, etc.) completely mixed.

Specification (Carried Standard Q/1423MCX001-2012)

ItemElectronic GradePharmaceutical GradeIndustrial Grade
Purity % ≥99.999.899.5
Water %
Density(20℃)g/ml 1.026 ~ 1.036 1.026 ~ 1.0361.026 ~ 1.036
PH(20℃) 50%6.5 ~ 9.0
Flash Point898989

Environmental disposal of waste liquid: Used, dirty waste N-Methyl-Pyrrolidone,N-Methyl-2-pyrrolidone,1-Methyl-2-pyrrolidone, Methylpyrrolidone NMP  can be used by solvent recovery machine and vacuum decompression system can stop the recycling application.  Because of its high boiling point compare with, so can’t use direct recycling method, through the vacuum pressure, reduces recycle heating temperature, ensure the quality of recycling, recycling peace progress factor has the above properties will see that the material can miscibility with water and you find heat only he dissolves in water solution heat release, similar to sulfuric acid in the water will also release a lot of heat.  

Supplementary heat of dissolution: refers to the thermal effect generated when a solute of a certain quality is dissolved in a solvent at a certain temperature and pressure (usually the standard state of temperature 298K and pressure 100kPa).  Equal to the amount of heat emitted or absorbed by a mole of solute dissolved in approximately a volume of solvent.  

N-Methyl-Pyrrolidone, N-Methyl-2-pyrrolidone, 1-Methyl-2-pyrrolidone, Methylpyrrolidone NMP exhaust gas recovery and treatment system can be designed for 50-100% fully closed cycle, solvent recovery – Using freeze-internal circulation adsorption concentration technology to recover the organic solvent in the exhaust gas, the recovery rate of organic solvent is greater than 85-95% : due to the large exhaust air volume and low concentration of the coater, the internal circulation is used to continuously concentrate the organic solvent in the exhaust gas to a certain concentration, and then condense recovery, reducing the recovery cost.   

At the same time, the product has the following advantages:

N-methyl pyrrolidone
  1. Solvent recovery efficiency is 85-95% and heat energy saving efficiency is 60-80%.  Such as:  To deal with 10,000 air volume, a ZN FSQ-10000-1 combined solvent unit (including heat recovery unit) is used to recover 46kg/h of solvent (the index of pole design is within the range of REASONABLE NMP concentration of 10,000 air volume, saving electric energy 187kW /h.  The value of recovering solvent and saving electric energy in one year reaches RMB 2 million (based on recovering solvent 10,000 yuan/ton, electricity cost 0.7 yuan/ton)  
  2. The content of organic solvent in the gas after solvent recovery treatment can be less than 39ppm, or to the “zero” emission requirements,  NMP exhaust gas emission refers to the emission rate standard requirements calculated by the implementation of the “Allowable Concentration of Harmful Organic matter in the Air of the working Environment of the former Soviet Union” and the “Technical Methods for Establishing local Emission Standards of Air Pollutants” (GB/T3840-91).  Fully meet the requirements of IS014000 and comply with the national comprehensive emission standard of Air pollutants GB16297-1996.  
  3.  The air in the coater adopts closed cycle, and the influence of ambient temperature, humidity and air quality on the coating quality is reduced.  
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