Method for separating mixer of 2,4-dichlorophenol and 2,5-dichlorophenol

Method for separating mixer of 2,4-dichlorophenol and 2,5-dichlorophenol

  • CN 101,412,664 A
  • Filed: 11/06/2008
  • Published: 04/22/2009
  • Est. Priority Date: 11/06/2008
  • Status: Active Grant
First Claim
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1. one kind 2,4-chlorophenesic acid and 2, the separation method of 5-dichlorophenol mixture, described method comprises:

  • get 2,4-chlorophenesic acid and 2, the 5-dichlorophenol mixture, with quality be 2,4-chlorophenesic acid and 2, the heterogeneous ring compound 1 that 5-dichlorophenol mixture quality is 0.2~

    0.4 times mixes, the aqueous solution that adds capacity organic solvent 1 or organic solvent 1, heating makes 2,4-chlorophenesic acid and 2, the 5-chlorophenesic acid is dissolved fully, leave standstill until crystal in-10 ℃



    30 ℃ and

    to separate out, filter and obtain 2, the complex crystal of 5-chlorophenesic acid and heterogeneous ring compound 1, filtrate continuation adds heterogeneous ring compound 2, add capacity organic solvent 2 or its aqueous solution again, be heated to the solution clarification, leave standstill until crystal in-10 ℃



    30 ℃ and

    separate out, filtration obtains 2, the complex crystal of 4-chlorophenesic acid and heterogeneous ring compound 2, with 2, the complex crystal and 2 of 5-chlorophenesic acid and heterogeneous ring compound 1, the complex crystal of 4-chlorophenesic acid and heterogeneous ring compound 2 is respectively through suction filtration, heterogeneous ring compound 1 and heterogeneous ring compound 2 are removed in distillation, crystallization, obtain 2 respectively, 5-chlorophenesic acid and 2,4 dichloro phenol;

    Described heterogeneous ring compound 1 and heterogeneous ring compound 2 are independent separately to be one of following;

    morphine quinoline, N-methylmorpholine, N-Ethylmorphine quinoline, piperazine, N methyl piperazine, N-ethyl piperazidine;

    Described organic solvent 1 and organic solvent 2 are independent separately to be one of following;

    methyl alcohol, ethanol, acetone, ethyl acetate, dimethyl sulfoxide (DMSO).

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