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M50甲醇汽油相稳定性影响的研究 总被引:1,自引:1,他引:0
通过对M50甲醇汽油相稳定性能的研究,表明加入不同类型、不同含量的助溶剂提高了M50甲醇汽油的抗水能力。其中正辛醇的效果最好,异丙醇效果最差。随助溶剂含量增加最大含水量不断增加。其中1-辛醇作用最为显著。助溶剂中疏水基碳链增加对甲醇汽油抗水性能较好。 相似文献
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经抽样检验发现,车用乙醇汽油中存在的主要问题是:低标号汽油冒充高标号汽油;甲醇汽油冒充乙醇汽油;其他舍氧化合物含量超标。 相似文献
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合成了系列乙醇酸酯,考察其对不同甲醇汽油无水体系的相稳定性以及蒸发性的影响规律,并对不同碳链乙醇酸酯的影响效果进行了考察。结果显示:对于不同比例的甲醇汽油体系,乙醇酸酯类助剂均具有良好的相稳定作用;随着乙醇酸酯中碳原子数的增加,其相稳定温度降低,相稳定效果增强,助溶效果增加。乙醇酸酯的加量增大,其体系的饱和蒸气压先减小后略有增大。其中乙醇酸甲酯的量增加,甲醇汽油M15体系饱和蒸气压呈现减小的趋势。随着乙醇酸酯中碳链的增长,甲醇汽油体系饱和蒸气压的降低效果增强;碳链继续增长,乙醇酸庚酯、乙醇酸辛酯、乙醇酸癸酯呈现出特殊性,对体系饱和蒸气压的降低效果减弱。 相似文献
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进行耐臭氧及耐乙醇汽油和耐甲醇汽油丁腈橡胶(NBR)/聚氯乙烯(PVC)共混胶配方优化设计。胶料的优化配方为:NBR/PVC DN508(NBR的ACN质量分数为0.40) 100,炭黑N550 35,喷雾炭黑 30,氧化锌 5,硬脂酸 1,莱茵蜡654 1,防老剂4010NA 1.5,防老剂NBC 1.5,增塑剂DOP 30,硫黄/促进剂(低硫高促) 5.9。优化配方胶料的物理性能、耐臭氧、耐汽油、耐乙醇汽油、耐甲醇汽油以及脆性温度达到日本本田公司NBR/PVC防尘密封材料标准要求。 相似文献
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通过研究表明,经过复配后的助溶剂对甲醇汽油的抗水性能有良好的改善作用.在混合添加剂总含量4%时最大含水量超过了1%.并得到不同配方的助溶剂在添加相同含量时,最大含水量不同.最终得到了对于M50的最佳配方.在助溶剂为4%时,M50甲醇汽油的最大可含水量为1.2%.通过复配,可以减少助溶剂的用量.不仅节约了成本,还有利于保... 相似文献
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进行大掺量甲醇汽油研究及考核,通过计算机仿真模拟试验,优化添加剂配方组分。采用自溶合技术调配M45甲醇汽油,完成添加剂和M45甲醇汽油理化指标测试,进行M45甲醇汽油互溶性、高低温启动性等试验,进行行车试验,对M45甲醇汽油和纯汽油进行油耗和经济性的对比分析,确定添加剂和M45甲醇汽油生产工艺路线,制定企业标准。 相似文献
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通过向乙醇汽油中加入相稳定剂的方法,获得稳定的含水乙醇汽油体系,从而降低其成本,促进乙醇汽油在我国的推广应用。对4种非离子表面活性剂:月桂醇聚氧乙烯醚(AEO-3)、壬基酚聚氧乙烯醚(NP-4)、辛基酚聚氧乙烯醚(OP-4,OP-6)的相稳定效果进行研究。结果表明:对E15,E20和E25乙醇汽油,相稳定剂用量(体积分数)大于3%时,AEO-3的相稳定效果最优;对E5,E10乙醇汽油,随各表面活性剂的HLB值逐渐增大,相稳定效果依次增强。温度一定,体系的最大增溶水量与表面活性剂用量、乙醇配比均成正比。 相似文献
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The ZSM-5 catalyst has received significant attention in recent years due to its significant properties such as strong acidity and high surface area. Crystal size of the catalyst has been recognized as an important factor in its performance. This review investigates the effects of the crystal size of ZSM-5 on its catalytic performance—selectivity; conversion; lifetime, product distribution; and coke formation during methanol to hydrocarbons (MTH), methanol to dimethyl ether, ethanol to gasoline (ETG), ethylene to gasoline (ETG), acetone to gasoline (ATG), acetone to olefin (ATO), naphtha cracking, and and n-dodecane cracking processes. This study demonstrates that the reduction of crystal size leads to higher levels of activity, conversion, and stability in these various processes. 相似文献
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甲醇与汽油的相溶性与基础油的组成、环境温度、甲醇添加量有很大关系。对比了甲醇与汽油的理化特性,以市售90#和93#汽油为基础油探讨了不同添加量甲醇对混合燃料稳定性的影响,甲醇的添加对燃料油馏程特性影响显著,添加量增大(10%~50%),低沸点馏分增多。以异辛烷、环己烷、环己烯、苯模拟汽油中的烷烃、烯烃、芳烃组分,分别绘制了与甲醇的双液系相图,测定了异辛烷、环己烷、环己烯、苯混合模拟汽油与不同掺比甲醇体系的初馏点,从理论上阐明了甲醇汽油混合燃料低沸点组分增加的原因。通过4种醇类添加剂对甲醇汽油混合体系性能进行改进,获得了低温稳定性好、基本符合商用汽油馏程特性的新型车用燃料。 相似文献
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新型FMB车用醇基燃料配方体系研究 总被引:1,自引:0,他引:1
研究了车用醇基燃料的配方,结果表明:由质量分数为0.72的甲醇、0.25的C5+、0.02的C1~C5和0.01的MLN助溶剂组成的车用醇基燃料。在醇烃比A∶O=1∶9~9∶1范围内,均一、稳定、长期贮存不分层。MLN质量分数为0.01,车用醇基燃料中水的质量分数达0.008时,醇烃发生相分离。随着MLN质量分数的增加,达到相分离点的水质量分数增加,抗相分离能力增强。车用醇基燃料具有优良的耐热、耐寒稳定性。醇基燃料与汽油以任意比互溶,长期不分层。因此该车用醇基燃料可以代替汽油,具有广泛的使用价值。 相似文献
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Meitang Jin Zhao Xu Ying Bao Long Li Liping Wang Haijiao Lu Chuang Xie Hongxun Hao 《中国化学工程学报》2019,27(2):362-368
Omeprazole sodium(OMS), a typical non-hydrogen bond donors API, is only available in solvates so far, including monohydrate, ethanol solvate and methanol solvate. The methanol solvate was found for the first time. Solvate transformation thermodynamics of OMS was studied in this paper. First, the ternary phase diagrams forming two solvates for OMS in binary solvent mixtures including methanol + water, ethanol + water, and methanol+ ethanol were measured at temperature ranging of T =(278.15 to 313.15) K under atmospheric pressure. Further, the standard equilibrium constants of the solvate transformation reactions were evaluated according to the chemical reaction isothermal equation. The standard molar Gibbs free energy, the standard molar enthalpy, and the standard molar entropy of solvate transformation reactions were then calculated based on van't Hoff equation. Moreover, the thermodynamic stability of the OMS solvate was analyzed based on phase diagram. The results are of great importance to develop a crystallization process for manufacturing OMS solvate, and could be helpful to other solvate transformation research. 相似文献
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甲醇汽油作为车用燃料的有效补充,显示出广阔的市场空间和巨大的发展潜力。依次对甲醇汽油的馏程、气阻倾向、胶质、腐蚀性以及抗相分离性能等理化特性进行了系统分析,实验结果表明,汽油中的烃类物质与甲醇在不同浓度下可形成多元最低共沸物,显著影响甲醇汽油的馏程、气阻倾向和胶质;甲醇汽油对发动机的腐蚀性可通过腐蚀抑制剂的加入而减缓或消除。随着甲醇浓度的不断提高,甲醇汽油的抗相分离性能逐渐增强。研究结果可为解决甲醇汽油实际使用的问题奠定理论依据。 相似文献
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Extraction and in situ esterification of rice bran oil with ethanol were investigated by studying the effects of rice bran oil FFA content and water
content of ethanol. Ethyl ester formation in the ethanol phase increased as FFA content increased. Neutral oil solubility
in this phase fell considerably, resulting in a high ethyl ester content. The decrease of the water content in ethanol led
to an increase in neutral oil solubility in ethanol and promoted the equilibrium of reaction to ethyl-ester formation, resulting
in lower FFA content of the product. The main factor that affected yield and monoester content when using high-acidity bran
and various monohydroxy alcohols was the solubility of neutral oil in alcohol. The highest monoester content was obtained
with methanol. 相似文献