Method of concentrating and separating glyphosate in high salt content glyphosate mother liquor by film technique

Method of concentrating and separating glyphosate in high salt content glyphosate mother liquor by film technique

  • CN 101,058,586 B
  • Filed: 04/06/2007
  • Issued: 04/24/2013
  • Est. Priority Date: 04/06/2007
  • Status: Active Grant
First Claim
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1. method of utilizing glyphosate in the high saliferous glyphosate mother solution of membrane technique concentrating and separating, it is characterized in that:

  • the method comprises that mainly the step is poly-as follows;

    contain salt contained in the glyphosate mother solution of a large amount of salt and comprise sodium-chlor, ammonia chloride, sulfate of ammoniac, in the hydrochloride of nitric acid ammonia, vitriol, the nitrate one or more, salts contg per-cent is more than 3%, and the glyphosate mother solution that contains a large amount of salt separates;

    First mother liquor is carried out pre-treatment, regulate PH between 2 ~ 11, reach water pollution index SDI≤

    5 and o'"'"'clock enter the one-level membrane sepn, when the glyphosate mass percent reaches 2 ~ 5% in the dense side mother liquor, be collected in storage tank, the then continuation of glyphosate mass percent below 2% separates in the concentrated solution, until the glyphosate mass percent is collected in storage tank after reaching more than 2% in the concentrated solution;

    The one-level that is rich in salt sees through liquid and enters the secondary membrane sepn, and the secondary concentrated solution returns and enters the one-level membrane sepn;

    The secondary that is rich in salt sees through liquid and enters three grades of membrane sepn, and three grades of concentrated solutions return and enter the secondary membrane sepn, and a large amount of salt sees through liquid with three grades and drains;

    See through at last liquid and contain glyphosate mass percent<

    0.1%, wherein contain and use as high-quality high density salt solution after a large amount of salt can be used as or further film is processed, sodium chloride-containing salt solution can be used as the chlor-alkali water, and the chloride containing ammonia solution can be used as fertilizer;

    The described glyphosate mother solution that contains a large amount of salt is made by following two kinds of methods, and alkyl esterification method prepares the acid mother liquid that produces in the glyphosate production process and adds the alkali neutralization, regulates pH value to 10 ~ 12, reclaims catalyst of triethylamine, and residue contains the glyphosate mother solution of a large amount of salt;

    The mother liquor acid adding that perhaps produces in the IDA method dioxygen oxidation preparing glyphosate from N-phosphonomethyl aminodiacetic acid production process is regulated PH to 1 ~ 2, separates out the glyphosate crystallization, isolates the glyphosate mother solution that residue after the glyphosate crystallization contains a large amount of salt.

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