二硫代氨基甲酸盐絮凝处理模拟油田聚合物驱采油废水的效果研究

在碱性条件下,端氨基聚醚Jeffamine-T403与二硫化碳反应合成了二硫代氨基甲酸盐型絮凝剂DTC(T403).考察了DTC(T403)对模拟聚合物驱采油废水的絮凝除油性能,研究了DTC(T403)、水解聚丙烯酰胺(HPAM)、Fe2+和Fe3+的投加量以及pH值对除油效果的影响.结果发现,DTC(T403)与Fe2+络合形成的网状螯合物通过网捕作用取得良好的絮凝除油效果;HPAM的存在影响絮凝除油效果;在同时投加Fe2+和DTC(T403)且二者的投加量分别为10mg/L和25mg/L的条件下,HPAM含量在0～900mg/L范围和含油量约300mg/L的模拟水样经絮凝处理后其含油量均可降到10mg/L以下.DTC(T403)的絮凝除油效果受pH値的影响,在pH7.5条件下可取得良好的除油效果.DTC(T403)适用于含Fe2+的聚合物驱采油废水的处理.

Treatment of Simulated Produced Wastewater from Polymer Flooding in Oil Production Using Dithiocarbamate-type Flocculant

A dithiocarbamate flocculant, DTC(T403), was prepared by the reaction of amine-terminated polyoxypropane-ether compound known as Jeffamine-T403 and carbon disulfide in alkaline solution. The oil removal efficiency of DTC(T403) for simulated produced wastewater from polymer flooding in oil production was studied by Jar-test. The effect of the dosage of DTC(T403), hydrolyzed polyacrylamide(HPAM), Fe²⁺ and Fe³⁺ions, and pH on the oil removal efficiency of DTC(T403) was investigated. The results showed that the chelate polymer formed by DTC(T403) and Fe²⁺ ion has good oil removal performance by net capturing mechanism. HPAM had a negative effect on oil removal efficiency of DTC(T403). For the treatment of the simulated wastewater containing 0-900 mg/L of HPAM and 300 mg/L of oil, the residual oil concentrations in water samples decreased below 10 mg/L when the dosage of Fe²⁺ and DTC(T403) was 10 mg/L and 25 mg/L, respectively. The oil removal efficiency of DTC(T403) was affected by pH and good oil removal efficiency was obtained when the pH was below 7.5. DTC(T403) is appropriate for the treatment of oily wastewater containing Fe²⁺ ion.