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Removal of contaminants from N-methyl-2-pyrrolidone

  • US 6,051,720 A
  • Filed: 06/11/1999
  • Issued: 04/18/2000
  • Est. Priority Date: 06/11/1999
  • Status: Expired due to Fees
First Claim
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1. A process of removing at least one contaminant from contaminated N-methyl-2-pyrrolidone, said process comprising:

  • 1) contacting at least one monohalogenated aromatic compound and at least one base with contaminated N-methyl-2-pyrrolidone to produce a first stream;

    wherein said monohalogenated aromatic compound is represented by the formula;

    ##STR4## where X is a halogen;

    where at least one R1 constituent is an electron withdrawing radical and the remaining R1 constituents are the same or different and are selected from the group consisting of hydrogen and hydrocarbyl radicals having from 1 to about 10 carbon atoms per radical;

    where said R2 constituents are selected from the group consisting of hydrogen and hydrocarbyl radicals having from 1 to about 10 carbon atoms per radical;

    wherein the contaminated N-methyl-2-pyrrolidone contains at least one contaminant selected from the group consisting of phenol, thiophenol and phenyl disulfide;

    2) heating said first stream to a temperature in the range of about 100°

    C. to about 300°

    C.; and

    3) separating said first stream to produce a NMP-rich stream and a NMP-lean stream;

    wherein said NMP-rich stream comprises N-methyl-2-pyrrolidone; and

    wherein said NMP-lean stream comprises reaction products of said contaminant, said monohalogenated aromatic compound, and said base.

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