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US 4,057,588 AGranted
Process for the preparation of phloroglucinol
AssigneeAkzona Incorporated
InventorsHans-Georg Zengel, Manfred Bergfeld
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Abstract
Phloroglucinol is prepared by chlorinating benzenetricarboxylic acid-(1,3,5)-triamide in an aqueous, inorganic acid medium to form benzene-tricarboxylic acid-(1,3,5)-tri-N-chloramide, which is a new compound; the latter is converted by treatment with ammonia into 1,3,5-triureido-benzene, which is hydrolyzed in inorganic acid solution to phloroglucinol.
Claims8
A process for the preparation of phloroglucinol from benzene-tricarboxylic acid -- (1,3,5) -- triamide comprising the steps of:
- a. utilizing chlorine to chlorinate benzene -- tricarboxylic acid -- (1,3,5) -- triamide in an aqueous inorganic acid medium selected from the group consisting of aqueous hydrochloric acid, aqueous sulfuric acid, and aqueous phosphoric acid, an aqueous alcoholic medium, or a mixture thereof, at a temperature from about 0.degree. to about 40.degree. C, to form benzene -- tricarboxylic acid(1,3,5) -- tri-N-chloramide;
- b. reacting an aqueous suspension of said tri-N-chloramide with ammonia at a temperature not exceeding 25.degree. C until said tri-N-chloramide has dissolved and subsequently heating the reaction mixture to boiling to form 1,3,5-triureido-benzene;
- and
- c. hydrolyzing said 1,3,5-triureido-benzene in an inorganic acid solution selected from the group consisting of hydrochloric acid solution and sulfuric acid solution at a temperature from about 140.degree. to about 200.degree. C and corresponding characteristic partial pressure to form phloroglucinol.
1 more element
Dependencies are inferred from the claim text.