- Method for preparing chlorophosphonazo III
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The invention relates to a method for preparing chlorophosphonazo III, and steps are as follows: (1) preparation, to be more specific, aminochIorobenzene phosphoric acid, dilute hydrochloric acid, a sodium nitrite solution and chromotropic acid disodium salt are reacted to obtain crude chlorophosphonazo III; (2) acidification, to be more specific, a solid in a reaction solution of the step (1) is filtered out; the solid is warmly dissolved in a certain amount of dilute hydrochloric acid, and placed overnight for precipitation of a solid; and (3) drying. The method can reduce the production cost and improve the enterprise market competition ability during production without further using special equipment which is very expensive, and the product can be applied more in the market.
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Paragraph 0022; 0023; 0024; 0025; 0026; 0027; 0028-0045
(2017/06/02)
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