共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
以油酸、二乙烯三胺、氯化苄为原料合成了油酸咪唑啉季铵盐,采用电化学极化法测试了其对N80钢片在1mol·L-1盐酸溶液中的缓蚀性能;然后分别将KI、十二烷基苯磺酸钠(SDBS)、丙炔醇(PA)与油酸咪唑啉季铵盐进行复配,并测试了3种复配试剂对油酸咪唑啉季铵盐缓蚀率的影响。结果表明:当油酸咪唑啉季铵盐浓度达到50 mg·L-1时,N80钢片的腐蚀速率最小,缓蚀率高达92%;随着油酸咪唑啉季铵盐浓度的增大,缓蚀率趋于稳定;3种复配试剂对油酸咪唑啉季铵盐的缓蚀率都有明显改善,KI和SDBS的复配均能使缓蚀率达到95%以上,PA的复配效果最佳,缓蚀率可达到99%以上。 相似文献
4.
《应用化工》2022,(3):670-674
研究了曼尼希碱1-苯基-3-苯胺基-1-丙酮(PPO)、2-苯甲酰基-3-羟基-1-丙烯(BAA)和3-甲基丁炔醇(MB)的协同缓蚀作用。结果表明,以PPO为主剂、BAA和MB为助剂与分散剂等复配得到了缓蚀剂PBM-Ⅲ,与单独使用曼尼希碱PPO相比,缓蚀剂PBM-Ⅲ缓蚀性能更好,三者之间具有良好的协同缓蚀作用。测得N80钢片在90℃、PBM-Ⅲ加量为1.0%(w)的20%盐酸中的腐蚀速率为1.251 2 g/(m2·h),缓蚀率为99.90%;PBM-Ⅲ在N80钢片表面的吸附模型符合Langmuir吸附等温式,是以阳极控制为主的混合型缓蚀剂。 相似文献
5.
6.
7.
8.
《山东化工》2015,(13)
针对络合铁脱硫溶液对碳钢腐蚀严重,通过静态实验对无机缓蚀剂、有机缓蚀剂以及无机-有机复配缓蚀剂进行缓蚀性能考察,并通过超重力络合铁脱硫中试装置动态考察了复配缓蚀剂对脱硫化氢的影响及缓蚀性能。实验结果表明:硝酸钠、磷酸钾、硫酸锌、铬酸钾和亚硝酸钠五种无机缓蚀剂中,亚硝酸钠缓蚀效果较好,缓蚀率为97.78%;咪唑啉类型YQ-1、DA-1、DA-2、ZH-1和ZH-2有机缓蚀剂中,ZH-2缓蚀效果较好,缓蚀率为80.21%;将无机和有机缓蚀剂进行复配,其中亚硝酸钠∶ZH-2=2∶1(质量比)的缓蚀效果最好,其缓蚀率可达98%以上;在动态实验中,添加复配缓蚀剂1.5×10-3,可获得稳定的硫化氢脱除率接近100%,且缓蚀效果可达95.00%以上。 相似文献
9.
利用静态失重法、Tafel极化曲线研究了油酸咪唑啉类缓蚀剂在不同酸介质中对不锈钢的缓蚀性能,并尝试了油酸咪唑啉缓蚀剂与KI的复配实验。结果表明,油酸咪唑啉类缓蚀剂在10%盐酸中和10%硫酸中对不锈钢有很好的缓蚀作用。在10%盐酸介质中,只需加入0.3%的油酸咪唑啉缓蚀剂,不锈钢材质的缓蚀率就能达到98%;在10%硫酸介质中,缓蚀率在油酸咪唑啉缓蚀剂添加量为0.5%时最大,达到94%。与KI的复配结果表明,咪唑啉与KI之间有一定的缓蚀协同效应,复合使用可以达到降低成本和保持高缓蚀率的作用。 相似文献
10.
几种炔醇的合成及缓蚀效果 总被引:1,自引:0,他引:1
采用醇钾催化法以二甲苯为溶剂 ,分别由丙酮、丁酮和甲基异丁基酮与乙炔合成了甲基丁炔醇、甲基戊炔醇和二甲基己炔醇。整个反应在常压下进行。研究了催化剂用量 ,反应温度和反应时间对三种炔醇产率的影响。最佳合成条件是 (根据炔醇种类不同 ) :n(KOH)∶n(酮 ) =1~1.4,反应时间 1~ 1.5h ,反应温度为 0℃ ,炔醇产率为 82 %~ 96 %。将炔醇和其他组分复配成缓蚀剂 ,在w(HCl) =15 %的盐酸中进行缓蚀实验。结果表明 ,甲基戊炔醇的缓蚀效率和对温度的稳定性优于其余两种炔醇。盐酸中添加质量分数 0 1%的甲基戊炔醇 ,并与其他缓蚀组分共同作用 ,在 80℃时 ,N80钢片的腐蚀速率可以降到 4 5g·m-2 ·h-1。 相似文献
11.
12.
13.
14.
The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion. 相似文献
15.
17.
18.
19.
Claver IP Zhang H Li Q Zhu K Zhou H 《International journal of molecular sciences》2010,11(8):3002-3015
Starches were isolated from soaked and malted sorghum and studied to understand their physicochemical and functional properties. The swelling power (SP) and the water solubility index (WSI) of both starches were nearly similar at temperatures below 50 °C, but at more than 50 °C, the starch isolated from malted sorghum showed lower SP and high WSI than those isolated from raw and soaked sorghum. The pasting properties of starches determined by rapid visco-analyzer (RVA) showed that malted sorghum starch had a lower viscosity peak value (86 BU/RVU) than raw sorghum starch (454 BU/RVU). For both sorghum, X-ray diffractograms exhibited an A-type diffraction pattern, typical of cereal starches and the relative degrees of crystallinity ranged from 9.62 to 15.50%. Differential scanning calorimetry (DSC) revealed that raw sorghum starch showed an endotherm with a peak temperature (Tp) at 78.06 °C and gelatinization enthalpies of 2.83 J/g whereas five-day malted sorghum starch had a Tp at 47.22 °C and gelatinization enthalpies of 2.06 J/g. Storage modulus (G') and loss modulus (G″) of all starch suspensions increased steeply to a maximum at 70 °C and then decreased with continuous heating. The structural analysis of malted sorghum starch showed porosity on the granule's surface susceptible to the amylolysis. The results showed that physicochemical and functional properties of sorghum starches are influenced by soaking and malting methods. 相似文献
20.
催化装置粗汽油回炼技术在有效降低催化稳定汽油烯烃含量的同时,对催化装置产品分布产生明显的影响,继而影响到装置的综合经济效益。本文对不同粗汽油回炼量条件下,催化装置稳定汽油性质和产品分布变化趋势进行分析,对经济效益进行对比,阐明应用粗汽油回炼降低汽油烯烃技术时,要选择合适的操作条件,以期得到较好的综合经济效益。 相似文献