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Process for recovering processing liquids

  • US 5,993,608 A
  • Filed: 04/25/1997
  • Issued: 11/30/1999
  • Est. Priority Date: 04/25/1997
  • Status: Expired due to Term
First Claim
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1. A continuous process for recovering a processing liquid from a feed mixture, comprising said processing liquid, at least one component that is more volatile than said processing liquid, and at least one component that is less volatile than said processing liquid, comprising:

  • introducing said feed mixture into a first heating zone and initially heating said feed mixture to a temperature sufficient to volatilize at least some of said at least one more volatile component and at least a portion of said processing liquid, said temperature in said first heating zone being below the decomposition temperature of said processing liquid, to produce a vapor stream comprising said at least one more volatile component and said vaporized portion of said processing liquid, and a residuum containing said processing liquid, a reduced concentration of said at least one more volatile component, and said at least one less volatile component;

    separating said vapor stream from said residuum in a first separation zone to produce a separated residuum;

    passing a first portion of said separated residuum through a second heating zone at a temperature below the decomposition temperature of said processing liquid to produce a heated, first recycle stream;

    admixing said heated, first recycle stream with said feed mixture to effect said initial heating of said feed mixture;

    passing a second portion of said separated residuum through a solids/liquid separation zone to remove any solids present in said second portion of said separated residuum and produce a substantially solids-free, second recycle stream, said second recycle stream being recycled to said first separation zone; and

    recovering processing liquid from said vapor stream.

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