Green And Low Carbon: Mesomer Regeneration Technology Can Further Reduce Environmental Impact

Mesomer regeneration is a new concept proposed in the process of chemical recovery of polyester textiles. It is different from the traditional recycling application concept of recycling polyester to monomers (such as terephthalic acid and ethylene glycol). Mesomer regeneration proposes a more efficient chemical recovery path from textiles to textiles.

This method aims to realize the high-value regeneration and resource utilization of waste textiles. Waste polyester textiles are converted into intermediate polymers (intermediates) by chemical method, and then these intermediates are reused to produce new polyester fibers, so as to achieve recycling.

This concept is helpful to improve the recycling efficiency of waste textiles and the quality of recycled products, and is of great significance to promote the sustainable development of the textile industry.

How to implement the regeneration of polymer?

The method of polymer regeneration mainly involves the following steps:

　　1. Pretreatment: waste polyester textiles need to be crushed or chemically treated first to facilitate subsequent chemical reactions. For example, polyurethane rigid foam can be crushed into fine powder to obtain a physical form that can further chemical reaction.

　　2. Chemical treatment: chemical recovery refers to the decomposition of polyurethane into original reactants or other oligomers under the conditions of decomposing agents, catalysts, certain temperature and pressure, etc., to achieve recycling. Specific methods include hydrolysis, alcoholysis, etc.

　　3. Alcoholysis and hydrogenation: An effective method is to degrade macromolecular PET into small molecular oligomers through alcoholysis, improve its solubility, and promote the hydrogenation of polyester. Methanol plays a key role in this process, which can inhibit the reaction of product alcohol and ester, and release the product through alcoholysis of oligomer.

　　4. Pre polycondensation reaction: after the polyester oligomer melt with low TVOC content is filtered, the catalyst, heat stabilizer, anti ether agent and antioxidant are added for pre polycondensation reaction to obtain the pre polycondensation polyester melt with a certain average polymerization degree. The temperature, pressure and time of pre polycondensation reaction vary according to the specific process.

5. Final polycondensation reaction: the pre polycondensation polyester melt undergoes the final polycondensation reaction to obtain the recycled polyester melt with higher average polymerization degree. The temperature, pressure and time of final polycondensation reaction also vary according to the specific process.

　　6. Spinning process: Colored recycled polyester short fiber is made from colored recycled polyester melt through spinning process. The spinning process parameters include spinning temperature, spinning speed, drawing temperature, pre draft ratio, one draft ratio and two draft ratio.

Through the above steps, the high value conversion and recycling of waste polyester textiles can be realized, thus promoting the sustainable development of the textile industry.

Are there secondary pollution and harmful products in the regeneration process of intermediate?

With regard to the energy consumption, secondary pollution and whether the product is harmful during the regeneration of the mesomer, the following conclusions are drawn based on the search results:

1. Energy consumption: • Compared with the original PET filament, the regenerated PET filament has less impact on the environment, and can reduce the environmental impact from energy optimization, process improvement and other aspects. This shows that there is room for optimization of energy consumption in the mesomer regeneration process, and the energy consumption in the regeneration process is lower than that in the production of raw materials.

2. Secondary pollution: • In some chemical recovery methods, such as incineration to treat waste polyurethane, a large number of harmful gases will be produced, which is easy to cause secondary pollution to the environment. However, the regeneration process of mesomer usually does not involve incineration, but converts waste polyester into mesomer by chemical method, so the risk of secondary pollution is low. In addition, some environmental impact reports mentioned that by taking appropriate pollution prevention measures, pollution can be effectively controlled and the environment can be protected without secondary pollution.

3. Whether the product is harmful: • In the production process of recycled PET filament, compared with the original PET filament, the global warming potential and acidification effect potential are reduced, indicating that the environmental impact of recycled products is small. In addition, the production process adopted by some projects can process waste chemical fiber cloth and waste nylon cloth into recycled polyester special materials and recycled nylon particles. These products are considered environmentally friendly, and the process is relatively advanced. Therefore, it can be considered that the reclaimed polymer products are safe and will not cause harm to the environment and human health.

In conclusion, the regeneration process of the mesomer is relatively low in energy consumption and secondary pollution, and the product is safe and will not cause harm to the environment and human health. The environmental impact can be further reduced by optimizing the process and taking appropriate pollution prevention measures.