Purification method of terephthal aldehyde

Details Purification method of terephthal aldehyde Purification method of terephthal aldehyde

2007-02-27

2007-02-27

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

11294526

ABSTRACT:
The present invention relates to a method for preparing high-purity terephthalaldehyde from terephthalaldehyde crystal containing impurities by recrystallization using an antisolvent. Low-purity terephthalaldehyde prepared by a conventional method, which contains a small amount of impurities, is dissolved in a solvent and recrystallized using water as antisolvent to obtain high-purity terephthalaldehyde. The invention is significantly advantageous in using water only as antisolvent. Also, the purification process takes short time and is economical and environment-friendly.

REFERENCES:
patent: 2888488 (1959-05-01), Nace
patent: 4017547 (1977-04-01), Simmons et al.
patent: 4978802 (1990-12-01), Campo et al.
patent: 2001-199910 (2001-07-01), None

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