反应详情

温度

10 °C

A suspension of 1.997 kg (11.08 mol) of terephthalic acid monomethyl ester in 15.60 kg of 1,2-dimethoxyethane was stirred in a nitrogen atmosphere while being cooled at 10° C. To the suspension was added 400 mL (5.17 mol) of N,N-dimethylformamide and 1.323 kg (10.56 mol) of thionyl chloride in this order, and then the container was washed with 1.00 L of 1,2-dimethoxyethane. The suspension was stirred under heating at 60 to 73° C. for 1 hour and 2 minutes and then stirred while being cooled. 1.36 kg (10.52 mol) of N,N-diisopropylethylamine was added dropwise to the solution while cooling at 0° C., and the container was washed with 1.00 L of 1,2-dimethoxyethane. Then the reaction solution was stirred at 25° C., and the stirring was stopped 38 minutes after the internal temperature had reached 20° C. The reaction mixture was transferred into a plastic container, and 22.00 kg of “monomethyl terephthalate chloride/N,N-diisopropylethylamine” solution (terephthalic acid monomethyl ester chloride content: 1.84 kg) was obtained as a slightly tannish solution.

1. washthe container was washed with 1.00 L of 1,2-dimethoxyethane
2. stirringThe suspension was stirred
3. temperatureunder heating at 60 to 73° C. for 1 hour and 2 minutes
4. stirringstirred
5. temperaturewhile being cooled
6. temperaturewhile cooling at 0° C.
7. washthe container was washed with 1.00 L of 1,2-dimethoxyethane
8. stirringThen the reaction solution was stirred at 25° C.
9. customhad reached 20° C
10. customwas obtained as a slightly tannish solution