METHOD OF EXTRACTING PROPYLENE GLYCOL FROM AQUEOUS COMPOSITIONS,申请号RU20080130915-传众专利搜索

METHOD OF EXTRACTING PROPYLENE GLYCOL FROM AQUEOUS COMPOSITIONS

申请公布号：RU2412929(C2)

申请号：RU20080130915

申请日期：2006.12.13

申请公布日期：2011.02.27

申请人：

BASF SE;DZE DAU KEMIKAL KOMPANI

发明人：DIFFENBAKHER ARMIN;GEBBEL' KHANS-GEORG;BITTERLIKH SHTEFAN;FOSS KHARTVIG;SHUL'TTS KHENNING;FORLIN ANNA;PATRASKU RENATE

分类号：B01D1/26;B01D3/14;B01D61/00;C07C29/76;C07C31/20;C07C41/34;C07C43/13

主分类号：B01D1/26

摘要：FIELD: chemistry. ^ SUBSTANCE: present invention relates to a method of extracting at least monopropylene glycol and/or dipropylene glycol from a mixture (C), containing water and said propylene glycols, involving (I) evaporation of the mixture in at least two evaporation and/or distillation steps while lowering working pressure of the evaporators and/or distillation columns to obtain a mixture (C') and a mixture (C"), where mixture (C") is further separated into a mixture (C-Ia), which contains at least 90 wt % water, a mixture (C-Ib) which contains less than 95 wt % water through reverse osmosis; (II) separation of mixture (C') obtained from (I) in at least one additional distillation step to obtain a mixture (C-I) which contains at least 70 wt % water, and a mixture (C-II) containing less than 30 wt % water, where mixture (C) contains 70-99.5 wt % water and 0.01-25 wt % of the said propylene glycols, mixture (C') contains 80-99.9 wt % water and 2.5-15 wt % of the said propylene glycols, and mixture (C") contains 90-99.99 wt % water and 0.01-0.5 wt % of the said propylene glycols. ^ EFFECT: high efficiency of extracting propylene glycol. ^ 12 cl, 2 tbl, 2 ex