发明名称 |
DEPOLYMERIZATION PROCESS FOR RECYCLING POLYESTERS |
摘要 |
<p>A process for recovering suitable polyester feedstock material from recycled polyester includes the steps of depolymerizing the polyester into its component ester monomers and half-esters; separating the monomers and half-esters from other secondary materials; and mixing the component ester monomers and half-esters with additional monomers to produce a low molecular weight polyester. In a preferred embodiment of the invention the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester before the polyester is depolymerized. The invention further provides an apparatus for carrying out the process. The apparatus includes a first reactor for depolymerizing the recycled polyester, a separator for separating ester monomeric components and half-esters from secondary materials produced in the first reactor, and a second reactor for producing a low molecular weight polyester from the liquefied separator products.</p> |
申请公布号 |
EP1023369(B1) |
申请公布日期 |
2002.01.16 |
申请号 |
EP19980953536 |
申请日期 |
1998.10.15 |
申请人 |
EASTMAN CHEMICAL COMPANY |
发明人 |
EKART, MICHAEL, PAUL;PELL, THOMAS, MICHAEL, JR.;CORNELL, DAVID, DUNLAP;SHACKELFORD, DAMON, BRYAN |
分类号 |
C07C67/03;C07C67/08;C07C69/82;C08J11/24;(IPC1-7):C08J11/24 |
主分类号 |
C07C67/03 |
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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