发明授权
- 专利标题： Process for the preparation of condensation products of melamine
- 专利标题（中）： 制备三聚氰胺缩合产物的方法
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申请号： US14007075申请日： 2012-03-27
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公开(公告)号： US09096552B2公开(公告)日： 2015-08-04
- 发明人: Christiaan Johannes Cornelis Stoelwinder , Gerard Jan Kwant
- 申请人： Christiaan Johannes Cornelis Stoelwinder , Gerard Jan Kwant
- 申请人地址： NL Heerlen
- 专利权人： DSM IP ASSETS B.V.
- 当前专利权人： DSM IP ASSETS B.V.
- 当前专利权人地址： NL Heerlen
- 代理机构： Nixon & Vanderhye P.C.
- 优先权： EP11159957 20110328
- 国际申请： PCT/EP2012/055386 WO 20120327
- 国际公布： WO2012/130827 WO 20121004
- 主分类号： C07D251/70
- IPC分类号： C07D251/70 ; C07D403/12 ; C07D251/54
摘要：
The invention relates to a process for the purification of a melamine condensation product, comprising the steps of a) making a diluted slurry of a reaction product mixture comprising the melamine condensation product in a solution of a base in water with a pH of at least 9, b) keeping the diluted slurry for a period of at least 1 hour, c) concentrating the diluted slurry, thereby obtaining a concentrated slurry and an eluent, and d) washing the concentrated slurry by diluting the concentrated slurry with aqueous liquid and repeating step c, wherein the washing is performed by counterflow washing wherein eluents of downstream concentration steps are used to wash the slurry in upstream concentration steps.