116-81-4Relevant articles and documents
Preparation method for bromamine acid
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, (2019/05/22)
The invention discloses a preparation method for bromamine acid. The preparation method comprises the following steps: 1) taking 1-amino anthraquinone as a raw material and reacting with fuming sulfuric acid and sodium sulfate in a solvent, thereby acquiring a reaction liquor containing sulfonating products, wherein temperature of sulfonating reaction is at 100-150 DEG C and reaction time is 3-10h; 2) cooling the reaction liquor to 60-80 DEG C, adding iodine and anti-foaming agent, slowly dropwise adding bromine for 5-8h, and keeping temperature for 2-3h after the ending of dropwise adding; 3)ending bromination reaction, removing excessive bromine through reduced pressure distillation, adding a certain amount of water, cooling to 50-60 DEG C and filtering, thereby acquiring bromamine acidsulfate; 4) placing bromamine acid sulfate into a large amount of water, heating to 70-90 DEG C, adding sodium hydroxide for regulating pH to 8-9, cooling to 20-30 DEG C and performing suction filtration, thereby acquiring the product bromamine acid. The yield of product is 91% and the purity detected through liquid chromatogram is 99%.
Process for separating off 1-amino-4-bromoanthraquinone-2-sulphonic acid
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, (2008/06/13)
A process for separating off 1-amino-4-bromoanthraquinone-2-sulphonic acid from the reaction mixture formed by the bromination of 1-aminoanthraquinone-2-sulphonic acid in sulphuric acid, which process comprises adjusting the sulphuric acid concentration of the reaction mixture under the prevailing conditions of temperature and pressure to effect precipitation of 1-amino-4-bromoanthraquinone-2-sulphonic acid as the sulphate and thereafter separating the resultant sulphate precipitate from the reaction mixture.