排序方式: 共有17条查询结果,搜索用时 31 毫秒
1.
范炳均 《石油化工环境保护》2002,25(3):23-26
介绍某公司腈纶污水的水质特点,处理工艺、主要设备及构筑物设计参数。该污水预处理装置运行以来,处理效果良好,符合后续生化处理的进水要求。 相似文献
2.
丙烯酸聚氨酯涂层在我国典型大气环境下的老化历程 总被引:2,自引:0,他引:2
本文采用交流阻抗测试技术、傅立叶红外测试技术研究了丙烯酸聚氨酯涂层在我国典型大气环境(武汉、拉萨)下户外降解规律,分析了其降解机理,比较了不同地区的环境老化强度,并探讨了丙烯酸聚氨酯涂层降解过程中电化学等效回路模型的转换问题.结果表明:(i)随曝露时间的延长,涂层的孔隙率增加、孔隙结构增大,体系由一个时间常数特征转为两个时间常数特征,涂层内逐渐形成了腐蚀性离子通往基底金属的通道,基底金属发生腐蚀,随金属腐蚀产物的增加,金属/溶液双电层电容逐渐被具有弥散效应的电容元件替换;(ii)丙烯酸聚氨酯涂层抗蚀性能的降低主要由涂层内高分子链节的断裂所致,随曝露时间的延长,在仲酰胺处发生断裂,生成了新的基团伯酰胺;(iii)丙烯酸聚氨酯涂层在拉萨地区的降解速率较武汉地区快. 相似文献
3.
Violeta Neagu Carmen Paduraru Ion Bunia Lavinia Tofan 《Journal of environmental management》2009,91(1):270-276
Two acrylic adsorbents with different morphological structures and bearing amidoethylenamine and thiol groups were obtained and used for platinum sorption from chloride solution by the batch method. Physico-chemical parameters that influence adsorption such as initial Pt(IV) concentration, stirring time, pH, and adsorbent amount were investigated. The thermodynamic parameters of Pt(IV) sorption on the synthesized adsorbent were also evaluated based on Langmuir and Freundlich isotherms. Thermodynamic parameters estimated from Langmuir constants indicated that the adsorption is spontaneous, exothermic and there is a disordered state at the molecular level. The models used to analyze the sorption rate led to the conclusion that the most important step in the sorption of Pt(IV) could be both particle diffusion and chemical reaction of [PtCl6]− with amine functional groups. Thus, both the ion exchange and complex formation mechanisms can occur via nitrogen atoms in the recovery of Pt(IV) on the studied adsorbent. 相似文献
4.
离子色谱法测定丙烯酸丁酯生产废水中丙烯酸和对甲基苯磺酸 总被引:4,自引:1,他引:3
建立了用离子色谱法测定丙烯酸丁酯生产废水中丙烯酸和对甲基苯磺酸的新方法。采用IonPac AS11-HC阴离子色谱柱,淋洗液为30mmol/L的NaOH淋洗液,流速1ml/min,抑制电流75mA。丙烯酸根的检测下限为0.44mg/L(峰面积)、0.46mg/L(峰高),保留时间、峰高、峰面积的变异系数分别为0.03%、0.50%、0.50%,峰高、峰面积的线性回归系数R分别为0.9929、0.9954。对甲基苯磺酸根的检测下限为0.49mg/L(峰面积)、0.48mg/L(峰高),保留时间、峰高、峰面积的变异系数分别为0.02%、0.48%、0.47%,峰高、峰面积的线性回归系数R分别为0.9990、0.9998。常规无机阴离子对丙烯酸、对甲基苯磺酸的测定没有干扰。对实际废水样品进行分析,丙烯酸、对甲基苯磺酸的回收率分别为101.6%~104.4%、95.4%~96.8%。方法简便、灵敏、可靠。 相似文献
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6.
武耀锋 《再生资源与循环经济》2014,(7):32-35
研究pH值、温度、反应物比率对生成三元接枝共聚物的影响,三元接枝共聚物接枝率与接枝效率的计算,以及三元接枝共聚物对铜离子的吸附效果.实验与计算结果表明:生成三元接枝共聚物的最佳反应条件为引发剂(NH4)2S2O8用量6 mmol/L,反应温度50℃,壳聚糖(CTS):丙烯酰胺(AM):丙烯酸(AA)=1∶2.7∶0.3,pH值=7,反应时间5h;在相同条件下,三元接枝共聚物对铜离子去除效果比壳聚糖有了明显的改善,对铜离子去除率最高达到90.06%,比壳聚糖对铜离子的去除率高49.72%. 相似文献
7.
Incineration of acrylic waste solution in a lab scale quartz tube vertical incinerator showed the presence of 12–15 polycyclic
aromatic hydrocarbons (PAHs) from a list of 16 priority pollutants at 700–1100˚C after an interval of 50˚C. The amount of total 16 PAHs at 900 and 1100˚C was about 8.5 and 1.25 times higher than those at 700˚C (739.48 μg g−1) respectively. The amount of total probable (2A) and possible (2B) human carcinogenic PAHs was minimum at 700˚C. 相似文献
8.
离子交换纤维净化含丙烯酸废水的研究 总被引:2,自引:0,他引:2
研究了用离子交换纤维净化含丙烯酸废水,用静态法、动态法对强、弱碱性阴离子交换纤维的丙维酸吸附性能进行了研究,强碱阴离子交换纤维净化含然酸废水,净化率>99%,纤维用氢氧化钠再生,再生液可制聚丙烯酸钠。 相似文献
9.
Fusako Kawai K. Igarashi F. Kasuya M. Fukui 《Journal of Polymers and the Environment》1994,2(2):59-65
A possible aerobic degradative pathway for polyacrylate was examined with trimer (1,3,5-pentane tricarboxylic acid; PTCA)-utilizing bacteria. A few metabolic products from PTCA accumulated in culture filtrates and reaction mixtures of washed cells. Fraction A was detected as a main metabolite by high-performance liquid chromatography. A small amount of fraction B was concomitant with fraction A. Another fraction, C, was also detected. These compounds were suggested by liquid chromatography-mass spectrometry analyses to be 1,3,5-(1- or 2-pentene)tricarboxylic acid (fraction A or B) and 1,3,5-(2-oxopentane)tricarboxylic acid (fraction C). Fraction A was quickly further metabolized by washed cells, but fraction B was only gradually degraded. From these results, the metabolic pathway for polyacrylate is suggested to be quite similar to-oxidation for saturated fatty acids. The degradation of PTCA by washed cells was slower than that by growing cells and was inhibited by 5 mM NaN3. This suggests that the metabolism is linked to a respiratory chain or energy-producing system of bacteria which can aerobically assimilate PTCA.Paper presented at the Bio/Environmentally Degradable Polymer Society—Second National Meeting, August 19–21, 1993, Chicago, Illinois. 相似文献
10.
《Process Safety and Environmental Protection》2014,92(6):522-531
Acrylic acid (AA) is an important component for the production of acrylate polymer. In a typical acrylic manufacturing unit, waste water contains AA in a range of 4–15 wt.% contributes to the high values of chemical oxygen demand. Due to the toxicity of AA to the aquatic organism, this wastewater should be treated before it is discharged to the environment. The waste water could be evaporated before sending to the incineration which was neither economic feasible nor environmental friendly. Esterification of wastewater containing carboxylic acid with alcohol could be a promising method to recover the acid by converting it to ester while purifying the wastewater. In the present study, recovery of AA via esterification with 2-ethyl hexanol (2EH) was investigated. The model industrial wastewater with various concentration of AA (10–100% w/w) was reacted with 2EH to produce 2-ethyl hexyl acrylate (2EHA) in the setups with total reflux and continuously water removal. These Amberlyst-15 (ion exchange resin) catalyzed reactions were carried out under the mass transfer resistance free region. The performance of both systems was compared. The yield for the reactions of the AA solutions with the AA concentrations of 30–80% was enhanced significantly when the reactions were carried out using the second setup. The kinetic data of the esterification of dilute AA was well described by the Eley–Rideal (ER) kinetic model incorporated with a correction factor to consider the catalyst fouling effect and pseudo-homogeneous (PH) kinetic model for the AA polymerization. The findings have shown the potential of recovering AA from the waste water stream via esterification. The concentrated AA solutions or larger amount of inhibitor should be adopted to prevent the catalyst fouling by the deposition of poly-acrylic acid on the catalyst surface. 相似文献