苯磺酚基环烷烃甲酸酯水解动力学研究

测定了一批苯磺酰基环烷烃甲酸酯化合物的水解动力学数据，建立了一组描述这些化合物水解速率常数与温度关系的回归方程。研究了存在于化合物中的各种化学基团对水解反应的影响。     

离子色谱法测定化工废水中的甲酸、乙酸和丙酸

建立了用离子色谱法测定化工废水中的甲酸、乙酸和丙酸的方法。对实际样品进行分析,甲酸加标回收率为95.5%~104.2%;乙酸加标回收率为94.0%~105.8%;丙酸加标回收率为93.5%~103.8%。本方法分析速度快,所需样品量少,且无需复杂的前处理,简便、灵敏、可靠。     

羧酸类有机物催化湿式氧化过程中ZnFe0.25Al1.75O4催化剂的稳定性研究

草酸、甲酸和乙酸是催化湿式氧化过程3种最主要的小分子羧酸类中间产物．比较了ZnFe_0.25Al_1.75O₄催化剂降解这3种物质时的催化活性和铁离子溶出量的大小．160℃下草酸是唯一可被完全降解的物质,降解过程中铁溶出量高达9.5 mg·L^-1;而甲酸和乙酸对铁离子稳定性影响很小．由于草酸具有很强的酸性和还原性,铁溶出量在氮气气氛中比在氧气气氛中大．ZnFe_0.25Al_1.75O₄催化剂对水杨酸也具有很高的降解活性和稳定性．     

Performance of dithiocarbamate-type flocculant in treating simulated polymer flooding produced water

Produced water from polymer flooding is di cult to treat due to its high polymer concentration, high viscosity, and emulsified characteristics. The dithiocarbamate flocculant, DTC (T403), was prepared by the amine-terminated polyoxypropane-ether compound known as Je amine-T403. The product was characterized by IR spectra and elemental analysis. The DTC agent chelating with Fe2+ produced a network polymer matrix, which captured and removed oil droplets e ciently. Oil removal by the flocculent on simulated produced water with 0, 200, 500, 900 mg/L of partially hydrolyzed polyacrylamide (HPAM) was investigated for aspects of e ectiveness of DTC (T403) dosage and concentrations of HPAM and Fe2+ ions in the wastewater. Results showed that HPAM had a negative influence on oil removal e ciency when DTC (T403) dosage was lower than 20 mg/L. However, residual oil concentrations in tested samples with di erent concentrations of HPAM all decreased below 10 mg/L when DTC (T403) dosage reached 30 mg/L. The concentration of Fe2+ in the initial wastewater had a slight e ect on oil removal at the range of 2–12 mg/L. Results showed that Fe3+ could not be used in place of Fe2+ as Fe3+ could not react with DTC under flocculated conditions. The e ects of mineral salts ions were also investigated.     

离子色谱法测定水中三氯乙醛

基于三氯乙醛溶于水后形成水合三氯乙醛,在碱性溶液中与OH-发生卤仿反应分解为氯仿和甲酸盐的原理,采用离子色谱法检测甲酸浓度,从而计算出水样中三氯乙醛浓度。方法线性良好,检出限为0.007 mg/L,检测上限为100 mg/L,标准溶液平行测定的RSD<3%,加标回收率为99.7%,适用于不含甲酸水样中三氯乙醛的测定。