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    • 38. 发明公开
    • VERFAHREN ZUR HERSTELLUNG UND AUFREINIGUNG VON SALZEN DER ACRYLAMIDO-2-METHYL-PROPANSULFONSÄURE
    • 奥地利维吾尔族ZUR HERSTELLUNG AUFREINIGUNG VON SALZEN DER ACRYLAMIDO-2-METHYL-PROPANSULFONSURE
    • EP2785686A2
    • 2014-10-08
    • EP12791486.9
    • 2012-11-28
    • BASF SE
    • EBEL, KlausVOITL, TobiasKELLER, AndreasRUEDENAUER, StefanBARTLING, KarstenLANGLOTZ, BjoernSTEINER, Jochen
    • C07C303/44C07C309/15
    • C07C303/44C07C309/15
    • The invention relates to a method for producing salts of acrylamido-2-methylpropane sulfonic acid (A), comprising the following steps: a) producing a solution of a contaminated salt of acrylamido-2-methylpropane sulfonic acid (A) in a water-free, organic solvent (L) using at least one basic component (B) selected from the group comprising alkali metal oxides, alkaline-earth metal oxides, alkali hydroxides, alkaline-earth metal hydroxides, and amines of general formula (I) NR
      a R
      b R
      c (I), wherein the groups R
      a , R
      b , and R
      c mean the following independently of each other: hydrogen, C
      1 -C
      4 alkyl, hydroxy C
      1 -C
      4 alkyl, or C
      1 -C
      4 alkoxy, wherein the molar ratio of compound (A) to basic component (B) is preferably 1:1 to 1:3; b) optionally partially removing the organic solvent (L) at a pressure in the range of 0.001 to 2 bar (abs); c) recovering the dissolved salt of compound (A) by crystallization or precipitation, by changing the temperature and/or the pressure and/or the concentration of the salt in the solution; d) optionally drying the purified salt of acrylamido-2-methylpropane sulfonic acid (A). Said method according to the invention leads to salts that are poor in byproduct and especially suitable for polymerization.
    • 本发明涉及一种丙烯酰氨基-2-甲基丙磺酸(A)的盐的制备方法,包括以下步骤:a)将丙烯酰氨基-2-甲基丙磺酸(A)的污染盐溶液在水溶液中, 使用选自碱金属氧化物,碱土金属氧化物,碱金属氢氧化物,碱土金属氢氧化物和通式(I)的胺的至少一种碱性组分(B)的游离的有机溶剂(L)NRa Rb Rc(I)其中基团R a,R b和R c彼此独立地表示:氢,C 1 -C 4烷基,羟基C 1 -C 4烷基或C 1 -C 4烷氧基,其中化合物(A) 至碱性成分(B)优选为1:1〜1:3; b)任选地在0.001至2巴(abs)范围内的压力下部分除去有机溶剂(L); c)通过结晶或沉淀,通过改变溶液中的盐的温度和/或压力和/或浓度来回收化合物(A)的溶解盐; d)任选地干燥丙烯酰胺-2-甲基丙磺酸(A)的纯化盐。 根据本发明的所述方法导致副产物不良的盐,特别适用于聚合。