- IMPROVED OPTICAL BRIGHTENING AGENT FOR DETERGENT FORMULATIONS AND A PROCESS FOR PREPARING THE SAME
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The present invention relates to a process for preparing disodium 4,4'-bis(4-anilino-6-morpholino-s- triazin-2-ylamino)-2,2'-stilbene disulphonate in the β crystal form, the process comprising subjecting disodium 4,4'-bis (4:anilino-6-morpholino-s-triazin-2-ylamino)-2,2'-stilbene disulphonate in the a crystal form to steam distillation. It also discloses a process to get formulations based on disodium 4,4'-bis(4- anilino-6-morpholino-s-triazin-2-ylamino)-2,2'-stilbene disulphonate, with substantially lower content of the hazardous amines such as aniline and morpholine.
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(2017/06/10)
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