苯二氧基二乙酸的相转移催化合成及其浮选性能

用三丁基乙基硫酸乙酯铵作相转移催化剂，以苯二酚、一氯乙酸和氢氧化钠为原料，用三氯甲烷作溶剂，合成了3种不同结构的苯二氧基二乙酸。分别以油酸钠、十二胺和丁黄药为浮选捕收剂，考察了苯二氧基二乙酸对方解石、一水硬铝石和黄铁矿的抑制性能。结果表明，苯二氧基二乙酸的抑制能力较强，对上述3种矿物的抑制性能大小顺序为：方解石＞一水硬铝石＞黄铁矿，可作为方解石等含钙、镁脉石矿物的有效抑制剂。从基团电负性、浮选剂特性指数和亲憎平衡值等方面，对苯二氧基二乙酸的抑制性能进行了讨论。用MINDO3方法对3种药剂进行了量化计算，量化计算结果表明，它们的抑制能力大小顺序为：对位＞间位＞邻位；它们均以负一价离子的形式与矿物中的金属离子发生作用，未离解的羧基则难以发生离解，从而保证药剂与矿物作用后的亲水性，使矿物得到抑制。

Phase transfer catalyzed synthesis and flotation performance of biphenoxyl bi (acetic acid)

In the presence of tributylethylammonium ethosulfate as a phase transfer catalyst, three kinds of biphenoxyl bi(acetic acid) are synthesized from biphenol, chloroacetic acid and sodium hydroxide in a chloroform solvent. The depressing performance of biphenoxyl bi(acetic acid) to calcite, diaspore and pyrite was studied. The results show that biphenoxyl bi(acetic acid) possesses good depressing ability to the three minerals in the following order: calcite>diaspore>pyrite. It can be used as an efficient depressant for calcite and diaspore. The electronegativity of group, reagent specific exponent and HLB of biphenoxyl bi(acetic acid) are discussed. Quantum calculation was operated by Mopac Method on MSI workstation, which has explained the depressing mechanism and the structure performance relations of the synthesized reagents.