DMF, DMAC, and Spandex

DMF solvent recovery plants

We are able to offer a DMF solvent recovery plants by taking advantage of our know-how and operating technology based on the best track record for solvent collection in Japan. This solvent recovery plants features a high collection rate of not less than 99 percent, high-purity DMF output, and energy and space saving. Compared with the conventional model, the drainage load has been drastically reduced.

Formic acid is generated in the DMF solvent recovery process. Therefore, the standard process prevents the acid from being emitted by keeping the waste fluid neutral and distilling it at low temperatures. Our solvent recovery decomposes the formic acid using steam after the distilling process to manufacture DMF as a new product whose formic acid concentration does not exceed 50 ppm.

We also have been engaged in engineering, procurement and construction of DMAC Solvent recovery plant, which has been developed by making good use of our experiences in our Acrylic fiber plant, and Spandex fiber plant.


  • High collection rate (not less than 99%) and high-purity DMF
  • Energy and space saving
  • Significant reduction in the drainage load
  • Concentration possible as pretreatment
  • Long-term continuous and stable operation
  • Easy maintenance

Process flow

  1. 1.Waste fluid
  2. 2.Solids removal process: Pan dryer (our proprietary design) → Disposal
  3. 3.Dehydrating process: Double the effect → Collection
  4. 4.Formic acid removal process: Formic acid concentration of less than 50 ppm → Collection
  5. 5.Formic acid decomposition process: Formic acid decomposition column → impure DMF

Spandex Plant

We have extensive experience in bulting plants for manufacturing dry spining spandex, a fiber featuring high elasticity and high resistance to heat.

The heat resistance of conventional fused spandex is less than 130 degrees Celsius, which is the Required temperature for dyeing polyester fiber. However, our dry spandex overcomes this limitation by using a DMAC solvent.


  • High elasticity and high resistance to heat
  • Durable at 130ºC
  • Best-suited to circular and warp knitting