Caprolactam recovery with membrane treatment

Caprolactam recovery with membrane treatment

  • CN 102,666,483 A
  • Filed: 12/17/2010
  • Published: 09/12/2012
  • Est. Priority Date: 12/18/2009
  • Status: Active Application
First Claim
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1. thereby one kind is passed through the technology that membrane process is handled aqueous solution acquisition retentate and permeate;

  • Said aqueous solution comprises hexanolactam, ammonium sulfate and one or more other impurity;

    Said other impurity comprise and comprise from one or more organic impuritys of preparing process of caprolactam and optional and it is characterized in that the salt different with ammonium sulfate;

    Used film is selected from poly (ether sulfone) film, Sulfonated poly (ether sulfone) film, polyester film, PS membrane, aromatic poly film, the polyvinyl alcohol film of weight shutoff in the 100-1000g/mol scope, gathers piperazine film, CAM, oxidation titanium film, zirconium oxide film and pellumina;

    AndThe 60wt% that surpasses of the said hexanolactam in said aqueous solution passes film and arrives permeate side, thereby obtains the purified hexanolactam permeate flow that contains, andAt least the 50wt% of said organic impurity stays in the retentate solution.

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