无皂乳液聚合改性废聚苯乙烯

以聚(甲基丙烯酸丁酯—丙烯酸钠)(P (BMA- AANa))为乳化剂,采用无皂乳液聚合技术,利用BMA对废聚苯乙烯(PS)泡沫塑料进行接枝改性.实验得出适宜的工艺条件:P(BMA - AANa)质量分数为51.5％,m(BMA)∶m(丙烯酸)=4∶6,PS和BMA质量分数之和为10.0％;m(PS)∶m(BMA) =...     

Rain‐washing of mimic®, RH‐5992, from balsam fir foliage following application of two formulations

Abstract

Two formulation concentrates of the insecticide, RH‐5992 [N'‐t‐butyl‐N'‐(3,5‐dimethylbenzoyl)‐N‐(4‐ethylbenzoyI) hydrazine], an aqueous flowable (2F) and an emulsion‐suspension (ES), were diluted with water to provide spray mixes containing dosage rates ranging from 35 to 150 g of the active ingredient (AI)/ha. The mixes were sprayed in a laboratory chamber, onto balsam fir branch tips collected from field trees and greenhouse‐grown seedlings. Droplet spectra and spray mass recovery were determined on artificial samplers. Simulated rainfall of two different intensities was applied at different rain‐free periods, and rain droplet sizes were determined. Foliar washoff of RH‐5992 was assessed after application of different amounts of rain, and the increase in soil residues was evaluated.

A direct relationship was indicated between the amount of rainfall and RH‐5992 washoff. The larger the rain droplet size, the greater the amount washed off. Longer rain‐free periods made the deposits more resistant to rain. Regardless of the amount of rainfall, rain droplet size and rain‐free period, foliar deposits of the 2F formulation were washed off to a greater extent than the ES formulation. The increase in soil residues due to foliar washoff was greater for the 2F than for the ES formulation. The deposits of the emulsion‐suspension were consistently more resistant to rain‐washing than those of the aqueous flowable formulation.     

高效破乳菌的培养条件优化及破乳效能研究

从大庆油田受石油污染土壤中分离到1株具有较强破乳能力的莫海威芽孢杆菌(Bacillus mojavensis),其24h破乳率>83%.通过正交试验优化了影响该破乳菌生长及破乳效能的发酵条件;考察了影响其破乳效能的环境因素.结果表明,破乳菌体生长的最佳发酵条件为培养温度25℃、摇床转速160r/min、pH9、接菌量10%、培养时间40h;全培养液破乳的最佳发酵条件为培养温度25℃、摇床转速160r/min、pH5、接菌量6%、培养时间20h;破乳的最佳环境条件为pH5~9,温度30~50℃、全培养液与模型乳状液体积比为1:5.     

乳状液膜法治理氧化铁氨氮废水的研究

研究了采用液膜分离技术从氧化铁行业生产氨氮废水中处理氨氮的工艺,并通过实际工业废水进行了验证。主要考察了表面活性剂的用量、外水相pH值、内相试剂的选择、油内比、乳水比等因素对氨氮去除率的影响。通过实验结果表明:以3%EA表面活性剂(质量分数),10%内水相硫酸浓度,油内比为2∶1的乳状液膜体系,处理初始浓度为1057mg/L氧化铁行业氨氮废水,在pH值为11.8,乳水比Rew为1∶8的传质条件下,氨氮去除率可达94%以上。     

高压顶空毛细管气相色谱法测定聚合物乳液中的残余单体

介绍测定５种残余单体的顶空分析方法,采用高压顶空进样技术,研究高压顶空的测定条件,方法操作简单、无需对样品进行预处理,线性范围１０＾３－１０＾４,精密度ＲＳＤ〈５％,检出限〈１μｇ／ｇ。     

磁技术处理含油废水的研究进展

在磁技术除油力学原理的基础上,分析了磁性材料和改性磁性材料的除油机理,介绍了磁技术在处理油田废水、机械加工废水、轧钢废水和餐饮废水等方面的应用,指明了磁技术处理含油废水的发展方向。     

乳状液膜法处理邻甲苯酚废水的研究

研究了用非流动载体乳状液膜法对废水中的邻甲苯酚进行提取分离。对影响邻甲苯酚渗透扩散的几种因素进行考察。结果表明,油相为10％Span-80煤油溶液、料液pH=3．5～5、内水相为2％NaOH溶液和乳水比Rew=1:10的条件下,经过一级液膜分离过程,邻甲苯酚的提取率可达98％以上。对提取富集的邻甲苯酚还可以进行回收利用。     

Research on the critical temperature of thermal decomposition for large cartridge emulsion explosives

Emulsion explosives are one type of main industrial explosives. The emergence of the large cartridge emulsion explosives has brought new security incidents. The differential scanning calorimeter (DSC) and the accelerating rate calorimeter (ARC) were selected for the preliminary investigation of the thermal stability of emulsion explosives. The results showed that the initial thermal decomposition temperatures were in the range of 232–239 °C in nitrogen atmosphere (220–232 °C in oxygen atmosphere) in DSC measurements and 216 °C in ARC measurements. The slow cook-off experiments were carried out to investigate the critical temperature of the thermal decomposition (T_c) of the large cartridge emulsion explosives. The results indicated that the larger the diameter of the emulsion explosives, the smaller the T_c is. For the large cartridge emulsion explosives with diameter of 70 mm, the T_c was 170 °C at the heating rate of 3 °C h⁻¹. It is a dangerous temperature for the production of the large cartridge emulsion explosives and it should cause our attention.     

高浓度油脂乳化有机废水的治理

北海粮油工业有限公司油脂乳化废水 ,CODCr高达 15 0 0 0mg L ,油 5 0 0 0mg L ,采用高效气浮与成套设备处理后 ,收到了相当满意的效果     

超疏水膜用于含油废水处理过程机理及研究进展

综述了多年来国内外高度疏水膜应用于乳化油污水处理的研究及进展,简单介绍了含油污水处理及破乳方法,重点介绍了疏水膜分相机理和处理油水乳状液的破乳机理,讨论了影响疏水膜油水分离的因素。最后对今后的研究方向提出展望。