Process for the preparation of terephthalic acid and its...

Details Process for the preparation of terephthalic acid and its... Process for the preparation of terephthalic acid and its...

C - Chemistry, Metallurgy

07

C

C07C 63/26 (2006.01) C07C 51/09 (2006.01)

Patent

CA 2167781

The invention relates to a process for the preparation of terephthalic acid (TA) from pure dimethyl terephthalate (DMT) and/or DMT intermediate product by hydrolysis in a countercurrent reactor at a conversion of greater than 99 % and crystallization to give the solid product, which is characterized in that the sum of the stripping steam (S) and reaction water (W) satisfies the relationship L S + W 2L, wherein (L) represents the amount of water necessary to keep the terephthalic acid (TA) produced largely in solution during the reaction and in the bottom of the reactor, and the terephthalic acid produced is crystallized in a crystallization which is free from washing stages.

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