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1.
In this research, the solubility of methane in water at presence of β-cyclodextrin (CD), sodium dodecyl sulfate (SDS), and multiwall carbon nanotubes (NTs) have been investigated. The tests were performed at the pressures 3 and 5 bars and temperatures of 1–3°C. For any solution, data of vessel pressure versus time and the total absorption capacity were collected. NTs were dispersed in water by using SDS solution with a concentration of 1 wt% and applying ultrasonic agitation for 25 min. Addition of 0.5 wt% cyclodextrin increased the capacity of methane absorption as much as 14.63% at temperature 1°C and primary pressure of 3 bar. Dissolution capacity increased up to 5.26% by using NT along with SDS at the pressure of 5 bar and low temperatures. Simultaneous usage of CD, SDS, and NT (the solution containing 1 wt% CD, 0.1 wt% SDS, and 1 wt% NT) had the highest effect on the increase of amount and rate of dissolution. The amount of dissolution increases for this solution was 14.63% at temperature 1°C and the primary pressure 3 bar. Utilization of CD, SDS, and NT and their mixture improved the initial dissolution rate of methane at low temperatures.  相似文献   

2.
In this research, the semicompletion time (t95%) of gas uptake in the process of methane hydrate formation in the presence and absence of sodium dodecyl sulfate (SDS) and silver nanoparticles (SNPs) is investigated. The experiments were carried out in a 460 cm3 stirred batch reactor at temperatures of 273.65 and 275.65 K and initial pressures of 5, 5.7, and 7 MPa. The results showed that the addition of both additives at all tested conditions, noticeably, decreases the semicompletion time of methane uptake, compared to pure water. The semicompletion time of methane uptake in the presence of 500 ppm SDS, 45 μM SNPs, and 500 ppm SDS + 45 μM SNPs is 75.6, 546.3, and 129.9 min, respectively, while that for pure water it is 8729.0 min at 273.65 K and 7 MPa.  相似文献   

3.
Carbon dioxide emission to the atmosphere is one of the main causes of the current global warming. Therefore, capturing this greenhouse gas is very important. The effect of sodium dodecyl sulfate (SDS) and silver nanoparticles on semicompletion time (t95%) of carbon dioxide uptake in the process of gas hydrate formation is investigated in this communication. The tests were performed at temperatures of 273.65 and 275.65 K and initial pressures of 2 and 3 MPa in a 460 cm3 stirred batch reactor. Experimental measurements show that utilization of SDS and silver nanoparticles decreases the semicompletion time of carbon dioxide uptake considerably. The addition of SDS with concentration of 500 ppm and silver nanoparticles with concentration of 45 μM at p = 2 MPa and T = 275.65 K, respectively, decreases the semicompletion time of carbon dioxide uptake 136.09% and 152.88%, compared to pure water. Investigating the effect of temperature on the amount of t95% in the presence and absence of tested additives shows that this kinetic parameter decreases by increasing the temperature from 273.65 to 275.65 K.  相似文献   

4.
In this communication, the impacts of adding SDS (sodium dodecyl sulfate), TBAF (tetra-n-butylammonium fluoride) and the mixture of SDS + TBAF on the main kinetic parameters of CO2 hydrate formation (induction time, the quantity and rate of gas uptake, and storage capacity) were investigated. The tests were performed under stirring conditions at T = 5 ℃ and P = 3.8 MPa in a 169 cm3 batch reactor. The results show that adding SDS with a concentration of 400 ppm, TBAF with a concentration of 1–5 wt%, and the mixture of SDS + TBAF, would increase the storage capacity of CO2 hydrate and the quantity of gas uptake, and decrease the induction time of hydrate formation process. The addition of 5 wt% of TBAF and 400 ppm of SDS would increase the CO2 hydrate storage capacity by 86.1% and 81.6%, respectively, compared to pure water. Investigation of the impact of SDS, TBAF and their mixture on the rate of gas uptake indicates that the mixture of SDS + TBAF does not have a significant effect on the rate of gas uptake during hydrate formation process.  相似文献   

5.
β-环糊精经微波法酰化制得丙烯酸β-环糊精酯(β-CD-AA),再与烯丙基-联苯基醚(ABE)、丙烯酰胺(AM)、N,N-亚甲基双丙酰胺共聚合成β-CD交联聚合物AM/ABE/β-CD-AA,分别采用FTIR和TG技术对其结构和热稳定性进行了表征。以该聚合物为吸附剂,考察了金属离子溶液初始质量浓度、吸附温度及体系pH等条件对Cu2+,Pb2+,Zn2+吸附性能的影响。实验结果表明,AM/ABE/β-CD-AA共聚物对Cu2+,Pb2+,Zn2+的静态吸附量不同,其中,对Zn2+的吸附性能较为突出:在35℃、Zn2+初始质量浓度200mg/L、体系pH=3~4时,最大静态吸附量达50.1mg/g;AM/ABE/β-CD-AA共聚物对Cu2+,Pb2+,Zn2+的吸附符合Freundlich吸附等温方程。  相似文献   

6.
高温高压条件下钻井液滤失性的调控是保证钻井安全顺利的关键。针对传统降滤失剂环保性与高温降滤失性能难以兼顾的问题,以β-环糊精为单体,环氧氯丙烷为交联剂,通过反相乳液聚合法制备了环境友好的β-环糊精聚合物微球(β-CDP)。评价了不同温度热滚后的API滤失性能和高温高压滤失性能,并与几种典型的抗高温降滤失剂进行了性能对比,综合探讨了其滤失控制机理。研究表明,β-CDP在温度低于160℃时,降滤失性能优良;当温度超过160℃后,降滤失性能随着温度的升高进一步增强,240℃热滚后降滤失性能仍然突出,表现出与传统降滤失剂显著不同的特征。当温度低于160℃时,β-CDP主要通过吸水膨胀、增加泥饼压缩性、提高黏土分散稳定性等作用降低滤失量;当温度高于160℃时,β-CDP发生水热碳化反应,降解生成微纳米碳球以及与黏土颗粒相互作用生成纳米复合物,能够对泥饼的微纳米孔隙进行填充,有效降低泥饼的渗透性。β-CDP特有的这种"温度响应"特征,实现了将高温破坏处理剂的不利因素转变成滤失控制的有利条件。  相似文献   

7.
基于水合物法储存分离二氧化碳具有较广阔的应用前景,通过实验研究了复合添加剂对二氧化碳水合物生成条件的影响,选用十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)以及两者的混合溶液作为实验用溶液,研究发现当采用浓度为265mg/L的SDS和SDBS质量比为1:1的复合添加剂溶液时,二氧化碳水合物的相平衡点最低,最易生成,此时的溶液体系能很好的促进水合物生成,而且比单一的SDS溶液或者SDBS溶液体系下水合物的生成条件都有所降低。建立了考虑复合添加剂促进作用的新型水合物生成动力学模型。  相似文献   

8.
The focus of the research is the minimizing amount of oil sludge via dehydration. The effects of using combination of polyaluminum chloride and biomass as additives on the possible improvement of the dehydration performance (evaluated via water content of oily sludge) of oil sludge and on the yield of pyrolysis oil at 723 K were investigated. The main influencing factors of dehydration considered in the experiment are biomass species and dosage, temperature, and flocculation time. The water content of oily sludge was significantly reduced when biomass ranging from 0.5 to 3.0 wt% on dosage ratio. The best phase dehydration performance was obtained from Apricot shell of 0.5 wt% at 313–323 K at flocculate time of 30–40 min, while the highest recovery percent of pyrolysis oil (33.54%) was obtained from Walnut shell of 1.0 wt%. The results indicate that the positive effects of the biomass in oily sludge on the improvement of dehydration performance and on recovery rate of the pyrolysis oil were observed. The main reasons that the improvement of dehydration performance may be responsible for the mixtures containing different proportions of oil sludge and biomass. The pyrolysis of the mixtures can increase the yield of pyrolysis oil and the higher heating value of oily sludge.  相似文献   

9.
In this research, the effects of multi-walled carbon nanotubes (NTs) on dissolution of methane in water have been investigated. The tests were performed in a 370 CC vessel at pressures 3 and 5 bar and temperatures of 1–5°C. The solution volume was 300 CC. For any solution data of vessel pressure versus time and the total absorption capacity were collected. NTs were dispersed in water by using the sodium dodecyl sulfate (SDS) solution with a concentration of 1 wt% and applying ultrasonic agitation for 25 min. Utilization of 0.1 wt% SDS at a pressure of 3 bar reduced the dissolution capacity, while at the pressure of 5 bar a negligible increase was observed. Dissolution capacity increased up to 5.26% by using of NT along with SDS at the pressure of 5 bar and low temperatures. Utilization of SDS, NT, and their mixtures improved the pressure reduction slope of methane at low temperatures.  相似文献   

10.
向气体水合物反应液中添加表面活性剂能够降低反应液的表面张力,有利于促进气体水合物生成,提高气体水合物生成速率。为了明确表面活性剂对气体水合物反应液表面张力的影响规律,在3℃~12℃温度范围,利用德国KRUSS公司生产的界面张力仪K11中的板法分别测定了十二烷基苯磺酸钠(SDBS)、十六烷基三甲基溴化铵(CTAB)和聚氧乙烯-聚氧丙烯-聚氧乙烯(P123)3种表面活性剂对反应液表面张力的降低效果,考察了浓度、温度对溶液表面张力的影响,并对影响机理进行了分析。实验结果表明:3种表面活性剂均能降低气体水合物反应液表面张力,CTAB、P123、SDBS的临界胶束浓度(CMC)分别为质量分数300×10-6、500×10-6、700×10-6;CTAB降低水合反应液表面张力效果最优,添加质量分数为300×10-6时,表面张力的平均降幅约为79.6%。  相似文献   

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