Process for producing purified terephthalic acid

Details Process for producing purified terephthalic acid Process for producing purified terephthalic acid

C - Chemistry, Metallurgy

07

C

C07C 51/215 (2006.01) C07C 51/487 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2046163

In a process for producing purified terephthalic acid which comprises catalytically oxidizing p-xylene in liquid phase to produce crude terephthalic acid containing 4-carboxybencaldehyde as a main impurity therein, and treating the crude terephthalic acid with hydrogen in the presence of a hydrogenation catalyst in a reaction vessel, thereby to produce purified terephthalic acid containing 4-carboxybenzaldehyde in an amount of fixed range in a stationary manner, there is provided an improvement which makes it possible for the treatment to reach the stationary state promtly after partial exchange of deactivated catalyst for a new one. The improvement comprises feeding into the reactor crude terephthalic acid which contains 4-carboxy-benzaldehyde in an amount larger than that in the stationary state of the treatment, and treating the terephthalic acid until the treatment reaches the stationary state.

Affiliated with

Also associated with

Rating

Process for producing purified terephthalic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing purified terephthalic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing purified terephthalic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1955566