C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/510.8
C07C 63/26 (2006.01) C07C 51/487 (2006.01)
Patent
CA 1206164
Abstract of the Disclosure A process for producing terephthalic acid suitable for use in direct polymerization, which comprises oxidizing p-xylene with molecular oxygen in an acetic acid solvent in the presence of a heavy metal compound and a bromine compound, wherein after a main reaction step of oxidizing at least 90 mole% of p-xylene fed has been performed, 1) a first purifying step of feeding a gas containing molecular oxygen to the oxida- tion reaction mixture obtained from the main reaction step in such a proportion that the concentration of oxygen in the off-gas becomes at least 0.5% by volume and smashing the oxidation reaction mixture at a temperature of 140 to 230°C to decrease the average particle diameter of terephtha- lic acid by at least 20% from its average particle diameter before smashing, and 2) a second purifying step of feeding a gas containing molecular oxygen to the slurry from the first purifying step in such a proportion that the concentration of oxygen in the off gas becomes 0.05 to 5% by volume, and contacting the slurry with the molecular oxygen-containing gas at a temperature at least 13°C higher than in the first purifying step and within the range of 180 to 300°C, are performed successively, and the resulting purified slurry is subjected to solid liquid separation to recover terephthalic acid.
442402
Murakami Katsuya
Nakajima Yasue
Takuma Toshiaki
Tsugiya Takanori
Tsumura Takayuki
Kuraray Yuka Co. Ltd.
Smart & Biggar
LandOfFree
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