发明授权
US4406750A Solvent removal from polymer solution utilizing flashed vapor as a heat source 失效
使用闪蒸蒸气作为热源从聚合物溶液中除去溶剂

Solvent removal from polymer solution utilizing flashed vapor as a heat
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摘要:
The energy requirements of a solution rubber process are significantly improved by employing solvent which has been removed in subsequent process steps.The invention concerns the separation treatment of the solvents and the polymer solutions produced by solution polymerization. In one embodiment a polymer solution is flashed to remove solvent vapor overhead and a concentrated polymer solution is removed as bottoms. The flashed solvent vapor is divided into at least two streams. A first stream is used as a stripping vapor medium in a zone for stripping a wet solvent to recover a wet solvent vapor overhead from the stripping zone and a dry solvent liquid as bottoms; the second flashed solvent vapor stream is used to preheat the wet solvent feed to the stripping zone by indirect contact heat exchange; a third portion of said solvent vapor can be combined with the second portion downstream of the heat exchange step, and the combined stream can be condensed.
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