Process for the production of high-purity tetrachloro-1,4-benzoq

Details Process for the production of high-purity tetrachloro-1,4-benzoq Process for the production of high-purity tetrachloro-1,4-benzoq

1991-06-28

1992-09-22

Garner, Vivian

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

Organic compounds

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

568765, C07C 5024, C07C 4606

Patent

active

051498502

ABSTRACT:
A process for the production of high-purity tetrachloro-1,4-benzoquinone by the action of chlorine and hydrochloric acid on hydroquinone which comprises causing 1.9 to 2.1 times the molar quantity of gaseous chlorine to act at temperatures from 5.degree. to 15.degree. C. on 1 mol of hydroquinone in 6 to 7 times the molar quantity of 30 to 37% hydrochloric acid, then diluting the resulting suspension, essentially containing 2,5-dichlorohydroquinone, with 2 to 3 parts of water, relative to hydroquinone employed, and initially warming to a temperature from 20.degree. to 30.degree. C., subsequently introducing 1.9 to 2.1 times the molar quantity of chlorine gas in an air atmosphere while raising the temperature to 90.degree.-100.degree. C. with simultaneous dilution with 3.5 to 4.5 parts of water, relative to hydroquinone employed, and finally introducing 1 to 2 times the molar quantity of gaseous chlorine, relative to hydroquinone employed, at temperatures from 100.degree. to 115.degree. C.

REFERENCES:
patent: 2414008 (1947-01-01), Alquist
patent: 2422089 (1947-06-01), Fletcher
patent: 2422229 (1947-06-01), Fletcher
patent: 2722537 (1955-11-01), Fox

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