发明名称 |
Process for the preparation of highly purified, dialkydithiophosphinic compounds |
摘要 |
An improved process for production of dialkyldithiophosphinic acid including sulfurizing a purified dialkylphosphinic acid by: reacting a hypophosphorous acid or salt with a stoichiometric excess of an alpha olefin in the presence of a free radical initiator to form a reaction product comprising monoalkylphosphinic acid and dialkylphosphinic acid; adding sufficient aqueous base to the reaction product to i) form the salts of the phosphinic acids, and ii) establish an aqueous phase and an organic phase, wherein a monoalkylphosphinic acid solubilizes into an aqueous phase; separating the organic phase from the aqueous phase; acidifying the organic phase and removing the olefin from the organic phase; isolating the purified dialkylphosphinic acid product; and sulfurizing the purified dialkylphosphinic acid product to form a dialkydithiophosphinic acid. The present invention also provides a process for preparing purified dialkylthiophosphinic chloride, and a process for preparing purified dialkylmonothiophosphinic acids.
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申请公布号 |
US2008103330(A1) |
申请公布日期 |
2008.05.01 |
申请号 |
US20070977620 |
申请日期 |
2007.10.25 |
申请人 |
LIU LEO ZHAOQING;WOODWARD GARY |
发明人 |
LIU LEO ZHAOQING;WOODWARD GARY |
分类号 |
C07F9/30;C07F9/34 |
主分类号 |
C07F9/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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