C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/265 (2006.01) C07C 51/44 (2006.01) C07C 51/487 (2006.01) C07C 63/26 (2006.01)
Patent
CA 2059719
Terephthalic acid is produced by oxidation of para xylene, purified in an aqueous phase and recovered by precipitating a purified product from the aqueous phase, the aqueous phase mother liquor is then cooled or evaporated to produce a further less pure precipitate and a second mother liquor and the less pure precipitate is returned to the reaction medium and/or the water of the second mother liquor is used to dissolve the crude solid and/or the second mother liquor is treated to recover water which is used to wash the precipitate recovered from the aqueous solution. The process produces better yields of terephthalic acid, reduces the use of water and reduces problems in the disposal of polluted waste water.
Hindmarsh Eric
Parker David
Turner John A.
Bennett Jones Llp
Hindmarsh Eric
Invista Technologies S.a.r.l.
Parker David
Turner John A.
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