Title:
【発明の名称】低分子量生成物を製造するための原料物質の解重合制御法
Document Type and Number:
Japanese Patent JP3072334
Kind Code:
B2
Abstract:
The practicality of known depolymerization reactions in which there is a danger of building up adherent residues on heat transfer surfaces is greatly improved by performing the process under conditions that provide a driving force which assures that none of the feed material and none of any liquid or solid residue produced during the depolymerization of the feed material remains in contact with any heat transfer surface for a time sufficiently long to form any adherent solid residue on the surface. A preferred apparatus for achieving such a driving force includes a horizontal thin film evaporator, a controlled continuous input of liquid feed material, and continuous collection of desired reaction product and any residue that remains condensed throughout its passage through the reaction zone. The process is especially well adapted to producing cyclic ethylene tridecanedioate, cyclic ethylene dodecanedioate, and cyclopentadecanolide from higher molecular weight feed materials such as linear polymers of these materials, in greater than 90% yield in a single pass.
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Inventors:
El Sasser, A. Frederick, Jr.
Application Number:
JP50785092A
Publication Date:
July 31, 2000
Filing Date:
March 03, 1992
Export Citation:
Assignee:
Henkel Corporation
International Classes:
C07D313/00; C07D321/00; (IPC1-7): C07D313/00; C07D321/00
Domestic Patent References:
| JP63119481A |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)