Terephthalic Acid → Sulfuric Acid

Participants

Reaction Steps

A dope was prepared similarly to the procedure used in Example 13 from a 50:50 molar ratio of terephthalic acid (1122.9 g.) to dimethylterephthalate (1312.4 g.) employing a 1.5% molar excess of hydrazine sulfate (1785.3 g.) in 25% oleum. A 4 hour reaction time at 137° C. was used. After dilution with 74% sulfuric acid and oleum a spinnable dope was obtained of a copolymer having an inherent viscosity of 2.3. A sample of this dope was analyzed by proton and C13 nuclear magnetic resonance (NMR). The following relevant signals were observed:

Provenance & Evidence