IPA Recycling by Hydrolysis Reaction of TDI Residue

Abstract:

Thousands of tons of tar residue are gained as by-products in the production of toluene diisocyanate (TDI) using heavy solvent. It is very necessary to recycle the residue. In view of residue composition’s diversity, high purity isophthalic acid (IPA) was obtained as product by hydrolysis of diethyl isophthalate (DEIP) in the residue. Multiple factors which affected the yield of isophthalic acid were investigated. Suitable reaction conditions for industrial production were summarized: the tar residue was grinded to 100 mesh, mass ratio (NaOH: material) was 0.3:1, react in water for 3 hours at 90°C.

• Periodical: Advanced Materials Research (Volume 1078)
• Pages: 61-64
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1078.61
• Online since: December 2014
• Authors: Lian Ming Zhang, Yang Dong Hu, Lian Ying Wu*, Xi Wang, Zhong Min Wang
• Keywords: Hydrolysis, Isophthalic Acid, Residue, Toluene Diisocyanate

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