Preparation method of reactive brilliant orange dye

The invention relates to a preparation method of a reactive brilliant orange dye. The preparation method comprises the steps: heating J acid, and adding liquid caustic soda, and dissolving to obtain aJ acid dissolved solution; cooling the dissolved solution, and separating out crystals; continuing to cool, continuing to separate out crystals, and after spots are clear, carrying out filter pressing to obtain high-purity refined J acid; adding cyanuric chloride into ice water, and carrying out pulping treatment, to obtain a pulping liquid; adding solid para-ester into the pulping liquid, addinga mixed alkali solution, carrying out alkali adjustment, carrying out primary condensation reaction to obtain a primary condensation product, and heating to adjust the pH value to hydrolyze free cyanuric chloride when the primary condensation end point is reached; adding the refined J acid into the primary condensation product, and carrying out secondary condensation reaction to obtain a secondary condensation product; ad