Nylon 6,6 Value Chain

Technology Description

The chemistry to manufacture Nylon 6,6 Polymer from Hexamethylene Diamine (HMD) and Adipic Acid required the reaction of HMD and AA to produce a nylon salt and the subsequent polymerization of the salt to produce Nylon 6,6 Polymer.

INVISTA’s proprietary Nylon 6,6 Continuous Polymerization technology is a robust and efficient process for the production of Nylon 6,6 polymer from Adipic Acid and HMD.

HMD, AA and Demineralized water are combined and heated to form the Nylon Salt. The salt is then fed to an evaporator to remove the water prior to entering the reactor column. Initial polymerization occurs in the reactor column with subsequent polymerization occurring in the flasher and finisher. The finisher drives the polymerization to the desired intrinsic viscosity. The product is transferred to the pelletizer and subsequently dried and packed for shipment. INVISTA’s proprietary reactor, transfer line and additive injection designs ensure the production of high quality polymer.

The simplified process flow diagram for INVISTA’s Nylon 6,6 Continuous Polymerization Process is shown below:

Key Features

Offering/Technology highlights

  1. INVISTA is licensing its BEST technology. The same technology INVISTA is implementing at its new facility in Shanghai (SCIP)
  2. Sharing of INVISTA’s knowledge and know-how, including over 75 years of operating experience
  3. Continuous salt strike technology providing efficiency and uniformity
  4. Industry leading scale provides efficient fixed and capital costs, with lower variable conversion costs due to steam recovery process
  5. Long equipment life between overhauls and high operating efficiency


INVISTA’s technology package will be designed for an annual capacity of 40,000 tonnes per year of Nylon 6,6 Polymer.

IPT's technology offerings include a Technology Package that comprises a front End Engineering Package (FEEP), technology & operating know-how, market knowledge and project execution resources.  The size of the plant can be configured to meet the needs of the client. IPT also offers on-going Technical Services and the potential to enter into off-take agreements with its licensees.