Determining biodegradability of aspartic acid derivatives, degradable chelants, uses and compositions thereof
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0959352A1
公开(公告)日:1999-11-24
Chelants represented by formula (Ib) are determined to be biodegradable when Distance A is from 3.8 x 10-10 to 4.6 x 10-10m, Distance B is from 5.1 x 10-10 to 5.9 x 10-10m, and Distance C is from 4.3 to 6.7 x 10-10m. Compounds meeting these criteria are referred to as compounds of Formula 2. In addition to methods of analysis and computer systems therefor, the invention includes a method of chelating a metal ion to form a chelate and biodegrading the chelate comprising step (a) contacting the metal ion with at least one compound of Formula 2 to form a chelate and (b) contacting the resultant chelate or chelant with microbes of the type specified in ASTM 2667-89, ISO 5815 or effective enzymes thereof under conditions and for a time sufficient for biodegradation wherein either (i) the chelate formed in step (a) is formed in a process of removing deposits, scale, or rust; cleaning or washing; controlling metal initiated or catalyzed oxidation or deterioration including spoilage, discoloration, or rancidification; textile treatment; paper making; stabilization of polymers or phosphates; or petroleum drilling, production or recovery; or (ii) the chelate formed in step (a) is before step (b) used as a redox catalyst, in a process of photographic bleaching, bleach-fixing or developing; in electroless deposition or plating; in removing acid or oxide gases including H2S, NOx, SOx, CO and CO2; or in providing agricultural nutrients.
当距离 A 在 3.8 x 10-10 至 4.6 x 10-10m 之间,距离 B 在 5.1 x 10-10 至 5.9 x 10-10m 之间,距离 C 在 4.3 至 6.7 x 10-10m 之间时,由式(Ib)代表的螯合剂被确定为可生物降解。符合这些标准的化合物称为式 2 化合物。除分析方法和计算机系统外,本发明还包括一种螯合金属离子以形成螯合物并对螯合物进行生物降解的方法,该方法包括以下步骤:(a) 将金属离子与至少一种式 2 化合物接触以形成螯合物;(b) 将生成的螯合物或螯合剂与 ASTM 2667-89、ISO 5815 中规定类型的微生物或其有效酶接触,接触条件和时间应足以进行生物降解,其中 (i) 步骤(a)中形成的螯合物是在去除沉积物、水垢或铁锈的过程中形成的;清洁或洗涤;控制金属引发或催化的氧化或变质,包括腐败、变色或酸败;纺织品处理;造纸;聚合物或磷酸盐的稳定化;或石油钻探、生产或回收;或 (ii) 在步骤(a)中形成的螯合物在步骤(b)之前用作氧化还原催化剂,用于照相漂白、漂白固定或显影过程;用于无电解沉积或电镀;用于去除酸性或氧化气体,包括 H2S、NOx、SOx、CO 和 CO2;或用于提供农业养分。