C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/396
C07C 46/06 (2006.01) C07C 37/62 (2006.01) C07C 46/00 (2006.01) C07C 50/24 (2006.01)
Patent
CA 1313879
HOE 87/F 033 Abstract of the disclosure: A process for the preparation of high-purity tetrachloro- 1,4-benzoquinone by the action of hydrogen peroxide and hydrochloric acid on hydroquinone, which comprises causing 3.8 to 4.2 times the molar quantity of 30 to 37% hydro- chloric acid and 1.9 to 2.1 times the molar quantity of 50 to 35% hydrogen peroxide, to act at 5 to 50°C on 1 mole of hydroquinone in at least 12 times the molar quantity of 30 to 37% hydrochloric acid, then heating the resulting suspension, which essentially contains 2,5- dichlorohydroquinone, to 45 to 55°C and again causing to act on it, at 50 to 95°C, 3.8 to 4.2 times the molar quantity of 30 to 37% hydrochloric acid and 1.9 to 2.1 times the molar quantity of 50 to 35% hydrogen peroxide, in each case based on the hydroquinone used, and finally adding to the suspension, which is now essentially composed of trichloro-1,4-benzoquinone, 1.9 to 2.1 times the molar quantity of hydrochloric acid of the said concentration range, and 0.95 to 1.05 times the molar quantity of hydrogen peroxide of the said concentration range, in each case based on the hydroquinone used, at 95 to 115°C, sufficiently slowly for no chlorine to escape.
558259
Arndt Otto
Papenfuhs Theodor
Arndt Otto
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Papenfuhs Theodor
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