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

1994-10-21

1996-06-11

Cook, Rebecca

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

Organic compounds

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

C07C 5024, C07C 4600, C07C 4606, C07C 4610

Patent

active

055257445

ABSTRACT:
A process for the preparation of tetrachloro-1,4-benzoquinone of high purity by the action of chlorine and concentrated hydrochloric acid on hydroquinone, by introducing a part of the hydroquinone to be employed into an initially introduced 4- to 6-fold molar amount--based on the total amount of hydroquinone--of 20 to 37 % aqueous hydrochloric acid containing catalytic amounts of iron(III) ions and an anionic dispersant, introducing 1.5 to 2.0 times the molar amount--based on total hydroquinone--of chlorine as a gas into this solution at a temperature of 20.degree. to 90.degree. C., then adding the residual amount of hydroquinone as a solid or in dissolved form, introducing 1.5 to 2.0 times the molar amount of chlorine as a gas, keeping the concentration of the hydrochloric acid here at 23-25% by addition of water and finally raising the temperature to 100.degree. to 107.degree. C. with further introduction of chlorine as a gas (1.7 to 2.5 times the molar amount) and dilution with water to a hydrochloric acid concentration of 20 to 22%.

REFERENCES:
patent: 5149850 (1992-09-01), Arndt et al.
Derwent Publication Ltd. Class E 14, & JP-A-5 271 144, 1993.

Affiliated with

Also associated with

Rating

Process for the preparation of tetrachloro-1,4-benzoquinone 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 the preparation of tetrachloro-1,4-benzoquinone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of tetrachloro-1,4-benzoquinone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-352964