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
- 专利标题: Process for isolating sulphur dyestuffs from aqueous crude melts containing sodium polysulphide
- 专利标题(中): 从含有多硫化钠的含水粗熔体中分离硫化染料的方法
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申请号: US197814申请日: 1980-10-17
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公开(公告)号: US4309178A公开(公告)日: 1982-01-05
- 发明人: Georg Daniek , Artur Meyer , Wolf Weidemuller
- 申请人: Georg Daniek , Artur Meyer , Wolf Weidemuller
- 申请人地址: DEX Frankfurt
- 专利权人: Cassella Aktiengesellschaft
- 当前专利权人: Cassella Aktiengesellschaft
- 当前专利权人地址: DEX Frankfurt
- 优先权: DEX2942591 19791022
- 主分类号: C09B49/00
- IPC分类号: C09B49/00 ; C09B67/54
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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