【摘要】 气体在乳液中的溶解度是决定水合物生成速率快慢的重要因素。为此结合排水法并采用自制加工的高压反应釜测定了在温度范围274.2~282.2 K和压力范围0.30~6.40 MPa下不同Span 20(失水山梨醇单月桂酸酯,简称Span 20)浓度及含水率时甲烷在柴油+水乳液体系中的溶解度,分别考察了温度、压力、含水率及Span 20浓度对溶解度的影响。实验结果表明,当含水率为30%(V/V)及Span 20浓度为3.0%(wt)时,甲烷在乳液中的溶解度随压力的增加几乎呈线性增加,在实验范围内溶解度最高达到0.0784(mol·mol-1),而温度对溶解度的影响相对较小;在近水合物生成区域,含水率的增加能显著降低甲烷在乳液体系中的溶解度,而在相同的温度、压力及含水率条件下,溶解度却随Span 20浓度的增加而增加,表明Span 20能促进甲烷在乳液中的溶解。更多还原

【Abstract】 The solubility of gas in emulsion is an important factor which determines how fast the hydrate formation rate is.Therefore,the solubility data of methane in the diesel oil + water emulsion with different Span 20(Sorbitan Monolaurate) concentrations at the temperature range of 274.2~282.2 K and the pressure range of 0.30~6.40 MPa were measured by the method of water displacement with using a specially developed high pressure cell.The effects of temperature,pressure,water content and Span 20 concentration on the solubility of methane in the emulsion were investigated.The results show that the solubility of methane in the emulsion increases linearly with the increase of the pressure when the water content is 30%(V/V) and the concentration of Span is 3.0%(wt);and the largest solubility of methane in the emulsion is up to 0.0784(mol·mol-1) in this work.Compared with pressure,the influence of temperature on the solubility of methane in the emulsion is not obvious.It was found that,at near hydrate formation region,the solubility of methane in the emulsion decreases with increasing water content;and when the temperature,pressure and water content are specified,the solubility of methane in the emulsion increases with the increase of Span 20 concentration.The result indicates that the Span 20 could promote the dissolution of methane in the emulsion.更多还原