Process for the preparation of tetrachloro-1,4-benzoquinone

Details Process for the preparation of tetrachloro-1,4-benzoquinone Process for the preparation of tetrachloro-1,4-benzoquinone

1995-02-22

1996-09-24

Prior, Kimberly J.

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

Organic compounds

Cyclohexadiene having atoms double bonded directly at the 1-...

C07C 5020

Patent

active

055592570

ABSTRACT:
The invention relates to a process for the preparation of tetrachloro-1,4-benzoquinone of high purity by the action of chlorine and concentrated hydrochloric acid on hydroquinone, which involves introducing a portion of the hydroquinone to be employed into initially introduced hydrochloric acid containing catalytic amounts of iron(III) ions and an anionic dispersant, introducing chlorine gas into this solution at a temperature from 20.degree. to 107.degree. C., then adding the residual quantity of hydroquinone as a solid or in solution, raising the temperature to from 80.degree. to 107.degree. C. while continuing to pass in gaseous chlorine, adding, after the introduction of gaseous chlorine has ended, a relatively high-boiling organic solvent which is not miscible with hydrochloric acid, and subsequently subjecting the reaction mixture to thermal aftertreatment.

REFERENCES:
patent: 5075462 (1991-12-01), Kuo et al.
patent: 5075463 (1991-12-01), Kuo et al.
patent: 5149850 (1992-09-01), Arndt et al.
patent: 5151532 (1992-09-01), Arndt et al.
Ullmann's Encyclopedia of Industrial Chemistry, 5th Ed., vol A8, pp. 342-348 (1987).
European Search Report No. 95101915.7, dated Jun. 13, 1995.

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