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Raw material synthesis route of

Yes, this is the ultimate article on OB, and you will be an OB insider. 1. Raw material synthesis route of optical brightener OB, Fluorescence brightener 0B was prepared from thiophen2, 5 dicarboxylic acid (OB acid) and o-amino-p-tert-butyl

Why the price of optical bright

Why the price of optical brightener OB keeps falling in 2019??? , the reason is very simple and complicated, simple is the change in supply and demand, the downstream of the original with optical brightener OB into two pie, one from waste f

What's the bottom line on the p

Since the beginning of 2019, the price of optical brighteners has been falling again and again. The reason is not that the price of raw materials of optical brighteners has been falling, but that the manufacturers of optical brighteners hav

Hefty fluorescent brighteners (

(1) process flow: (3) operation: 1) chloride: fan 120 kg and 140 kg thionyl chloride added to the reaction kettle, stirring, cooled to 0 ~ 5 ℃, then add 4 kg anhydrous aluminium trichloride, heating up to 15 ~ 18 ℃, 5 h at this temperatu

Synthetic route of fluorescent

(1) process flow: A methylamine | 4- chloronaphthalene -1, 8- dimethyl anhydride N- methylation reaction N- methyl -1, 4- chloron1, sodium methoxide 8-naphthalimide condensation filtration washing refining product (2) equation: (3) operatio

What is the raw material DSD ac

DSD acid optical brighteners are synthesized by condensation of DSD acid and other intermediates, which are classified as distyrene in many literatures. Book its single category, mainly because of one of the most important intermediate of s