发明授权
US4309178A Process for isolating sulphur dyestuffs from aqueous crude melts containing sodium polysulphide 失效
从含有多硫化钠的含水粗熔体中分离硫化染料的方法

Process for isolating sulphur dyestuffs from aqueous crude melts
containing sodium polysulphide
摘要:
In the processs for isolating solid sulphur dyestuffs from crude sulphur dyestuff melts, the improvement comprises adding 10.sup.-4 to 1% by weight, relative to the amount of dyestuff, of an organic flocculating auxiliary to the crude dyestuff melt to produce a filterable dyestuff precipitate and then separating said precipitate.
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