研究了以KOH为催化剂，二元或三元醇为起始剂，采用阴离子开环聚合合成淬火剂用共聚醚。 结果表明：产物的分子量随起始剂和杂质量的减少而增加；
The synthesis of oxyethylene oxypropylene copolyethers used for quenchant was studied by using anionic ring opening polymerization, diol or triol as the starting agent and KOH as the catalyst.
然后再由铋精矿制取铋的化工产品，这些铋品中的金属杂质元素含量都达到分析纯要求，有少量产品阴离子纯度有待提高。
Thecontents of metal impurities in the bismuth products obtain the standards of the analysis reagent and the contents of anions obtain the standard of the grade of chemical purity.
为减少水耗可以用循环水，供水中最有害的杂质是阴离子高分子量物质，会大大减少助留剂的效率，甚至使它们完全失效。
The most detrimental impurities in the feed water are anionic high molar mass substances. They can greatly reduce the efficiency of the retention AIDS or even make them completely ineffective.
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