发明名称 |
PROCESS FOR THE PREPARATION OF AN ALKANEDIOL AND A DIALKYL CARBONATE |
摘要 |
An alkanediol and a dialkyl carbonate are prepared in a process comprising: (a) contacting an alkylene carbonate with an alkanol feedstock under transesterification conditions in a reactive distillation zone to obtain a top stream comprising dialkyl carbonate and the alkanol and a bottom stream comprising an alkanediol; (b) separating the top stream comprising dialkyl carbonate and the alkanol into an alkanol-rich stream and a dialkyl carbonate-rich stream; (c) recovering the dialkyl carbonate from the dialkyl carbonate-rich stream; and (d) recycling at least part of the alkanol-rich stream to the reactive distillation zone as part of the alkanol feedstock, wherein the alkanol-rich stream is split in at least two portions, and at least one portion is condensed and freed from compounds with a lower boiling point than the alkanol. The process is especially suitable for the production of propylene glycol and dimethyl carbonate from propylene carbonate and methanol.
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申请公布号 |
US2007197814(A1) |
申请公布日期 |
2007.08.23 |
申请号 |
US20070677999 |
申请日期 |
2007.02.22 |
申请人 |
VAN DER HEIDE EVERT;NISBET TIMOTHY M;VAPORCIYAN GARO G |
发明人 |
VAN DER HEIDE EVERT;NISBET TIMOTHY M.;VAPORCIYAN GARO G. |
分类号 |
C07C69/96 |
主分类号 |
C07C69/96 |
代理机构 |
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代理人 |
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地址 |
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