Method for separating sec-butyl acetate from reaction mixture of acetic acid and hybrid C4

Method for separating sec-butyl acetate from reaction mixture of acetic acid and hybrid C4

  • CN 100,463,897 C
  • Filed: 02/02/2007
  • Issued: 02/25/2009
  • Est. Priority Date: 02/02/2007
  • Status: Active Grant
First Claim
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1. [claim 1] a kind of from acetate and hybrid C 4 post reaction mixture the method for the secondary butyl ester of separating acetic acid, it is characterized in that:

  • (1) acetate and hybrid C 4 post reaction mixture enter flashing tower, by flash distillation from unreacted hybrid C 4 of flash distillation removed overhead and light constituent;

    (2) the flashing tower bottom product enters azeotropy rectification column, adds entrainer A, by azeotropic distillation with sec-butyl acetate and separated from acetic acid;

    (3) azeotropic distillation cat head material enters treating tower, obtains sec-butyl acetate by rectifying;

    (4) amount that contains entrainer A when acetate from the extraction of azeotropy rectification column bottom to reaction impact or to catalyst activity with when impacting work-ing life, azeotropy rectification column bottom material enters sour upgrading tower, add entrainer B, through azeotropic distillation again, acetate is concentrated acetate recycle after concentrating;

    Or;

    the amount that contains entrainer A when the acetate from the extraction of azeotropy rectification column bottom can be to not impacting of reacting, and in the time of also can and not impacting work-ing life catalyst activity, azeotropy rectification column bottom material directly loops back reactive system and utilizes;

    (5) entrainer A is selected from water, and entrainer B is selected from sec-butyl acetate, isopropyl acetate, benzene.

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