共查询到19条相似文献,搜索用时 140 毫秒
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为了研究氢气在煤液化油中的溶解规律和煤液化反应过程中的氢耗,选择煤液化油中几种代表性物质的混合组分十六烷-四氢萘、四氢萘-喹啉、十六烷-喹啉作为溶剂,利用平衡液相取样法气体溶解度测定装置,测定了氢气在上述溶剂中不同温度和压力下的溶解度数据(453.15 K~623.15 K,1 MPa~10 MPa),同时给出了氢气在这些混合溶剂体系中的溶解度规律.利用数学模型lnxH2=-a/T+6T+clnT+dlnPH2+e(式中参数可由氢气在相应溶剂中的溶解度数据关联得到)和P/N/A方法计算相关溶解度数据,发现该数学模型的计算预测值与实验值的平均绝对误差(η)在5.52%左右,而通过P/N/A方法的计算,预测值与实验值的平均绝对误差较大,这表明该数学模型在计算氢气在有机混合溶剂中的溶解度方面具有很好的应用价值. 相似文献
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运用ChemCAD闪蒸分离模块建立模拟流程,考察了8种热力学性质计算模型,结果表明API-SRK、SRK、Peng-Rob-inson 3种方法较适合研究氢气在烃中溶解度的模拟计算。氢气、间二甲苯作为进料流股组分,以进料流股组分流率比例为考察对象,流率比值在2/1~2 664/1可完成闪蒸分离平衡计算。在温度为305.15、353、393、433 K,压力为0.8~5.0 MPa条件下,分别对氢气在间二甲苯、环已烷、苯、环已烷和苯中进行闪蒸平衡分离计算,计算结果为氢气在烃类中溶解度变化规律随温度压力的升高而增大,溶解度计算值与实验值相对偏差在5%以内。以上结果表明,选择合适的热力学性质计算模型和进料流股组分流率比例,运用ChemCAD闪蒸分离模块可准确计算氢气在烃类中溶解度。 相似文献
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为了减少有害物质的排放和改善空气质量,许多国家把柴油中硫含量降到超低水平。液相循环加氢技术是柴油超深度脱硫的一种新工艺,其优点是依靠油品或溶剂中溶解的氢来参与原料的加氢反应。在这一过程中,氢气在柴油中的溶解度起着关键作用。本文采用实验测定和Aspen Plus模拟运算两种方法,分别选用温度323~623 K和压力2~10 MPa的实验条件,研究了氢在不同型号柴油中的溶解度,得出了氢在不同型号柴油中的溶解度数据及溶解规律。实验条件下,氢气在0#柴油、直馏柴油、焦化柴油和催化柴油中溶解度大小顺序为:0#柴油>直馏柴油>焦化柴油>催化柴油;氢气在柴油中的溶解规律为随着温度和压力的增大而增大。研究结果可为柴油的液相循环加氢工艺操作参数的确定提供依据。 相似文献
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氢气在松脂和松香中的高压平衡溶解度 总被引:4,自引:1,他引:4
采用FYX-2G型高压搅拌釜,在温度353~573K、压力2.0~10.0MPa、搅拌转速600rmin-1的实验条件下,根据气体等容吸收降压原理,测定了氢气在松脂和松香中的平衡溶解度。结果表明其溶解度随温度和压力的升高而增加,溶解度—压力曲线为通过原点的直线,符合Henry定律。在相同温度、压力下,氢气在松脂中的溶解度大于松香。 根据 Vuuren提出的溶解度系数计算式,回归出溶解度系数与温度之间的关联式及溶解热:0.04459exp(496.8/)ST=-松脂, 4.1304HD=松脂soln, mkJmol-1;0.1885exp(1360.8/)ST=-松香, 11.314HD=松香soln, mkJmol-1,为松脂、松香催化加氢反 应机理研究和化学动力学模型的建立提供了基础数据。 相似文献
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合成气在间二甲苯中的溶解度 总被引:1,自引:0,他引:1
利用 1L的高压搅拌釜 ,采用气体间歇吸收技术 ,在温度为 35 3~ 433K、气体压力为 0 .5 5 .0MPa、转速为 80 0r min的实验条件下 ,测定了合成气 (CO和H2 )在间二甲苯中的溶解度 ,并与H2 和CO分别在间二甲苯中的溶解度进行比较。发现合成气中各组分的K(y x)值 (K为组分在气相和液相中的摩尔分率比 ) ,在一定压力和温度下不变 ,由此可推知不同组成下的溶解度。同时也可知 ,在相同的温度和压力下 ,H2比CO有较高的K值 ,即CO有较高的溶解度 相似文献
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氢气和一氧化碳在混二甲苯中的溶解度 总被引:3,自引:0,他引:3
在1立升的高压机械搅拌釜中,采用气体间歇吸收技术,在80-160℃,0.5-5MPa的范围内,测定了氢气和一化碳在混二甲苯中的溶解度。氢气和一氧化碳的溶解度随着温度和压力的增加而增大,且在相同的温度和压力下,一氧化碳的淀粉 度大于氢气的溶解度。与它们在间二甲苯中的溶解度相比,在混二甲苯中的溶解度是较小的。此外,使用正规溶液理论的Prausnitz-Shair方法对它们的溶解度进行了估算。可以看出,一氧化碳在二甲苯中的溶解度的估算值与实验结果较相符,氢气由地临界温度较低,没有合适的估算式,故用实验回归的公式结合Prausnitz-Shair方法中的其它公式进行估算,估算值与实验值大体相符。 相似文献
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The behavior of sulfur transformation during rapid hydropyrolysis of coal was investigated using a pressurized, continuous free fall pyrolyzer under the conditions of temperature ranging from 923 to 1123 K and hydrogen pressure up to 5 MPa. The yields of sulfur converted to gas, tar and char were determined, together with the analyses of sulfur form distributions in coals and chars. The results showed that the decomposition of inorganic sulfur species was affected only by the temperature, while the increases in temperature and hydrogen pressure obviously enhanced the removal of organic sulfur from coal. The extent of organic sulfur removal was proportional to the coal conversion, depending on coal type. A significant retention of gaseous sulfur products by the organic matrix of the char was observed during hydropyrolysis of a Chinese coal above 1023 K, even under the pressurized hydrogen atmosphere. The kinetic analysis indicates that the rate of organic sulfur removal from coal was 0.2th-order with respect to the hydrogen pressure, and the activation energy for total sulfur removal and organic sulfur removal is 17-26 and 13-55 kJ/mol, respectively. The low activation energies suggest that the transformation and removal of sulfur from coal might be controlled by the diffusion and/or thermodynamic equilibrium during hydropyrolysis under the pressurized conditions. 相似文献
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Experimental results are presented for hydrogen solubility in hydrogenated coal liquid (SRC-II) and coal-liquid partial pressure in the hydrogen-coal-liquid system, over temperature and pressure ranges of 420–680 K and 4–11 MPa. Two in situ hydrogen probes were used to determine the hydrogen partial pressure in the system. No coking was observed at these temperature levels. The results are in good agreement with hydrogen solubility data for similar hydrogen-bearing systems reported in the literature. The hydrogen solubility exhibits an inversion with increasing temperature at constant total pressure, which can be interpreted in terms of the strong dependence of the coal-liquid partial pressure on temperature. 相似文献
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高温煤焦油加氢裂解反应动力学研究 总被引:4,自引:0,他引:4
在360℃~400℃,氢气初压1MPa~2.5MPa,5min~40min以及0.5~3剂油比条件下,在自制的间歇式反应器上对高温煤焦油在超临界二甲苯中加氢裂解的宏观反应动力学进行了研究,建立起三集总宏观反应动力学模型.结果表明,该模型能较好反应高温煤焦油在超临界二甲苯中加氢裂解行为.在本实验条件下高温煤焦油在超临界二甲苯中加氢裂解反应时裂化反应的表观压力指数为-0.2111,表观剂油比指数为0.4033,表观活化能为15.765kJ/mol,指前因子为2.722min-1.MPa(0.2111);缩合反应的表观压力指数为-0.2884,表观剂油比指数为-0.4459,表观活化能为30.762kJ/mol,指前因子为18.952min-1.MPa(0.2884);总反应的表观压力指数为0.1609,表观剂油比指数为0.2265,表观活化能为39.049kJ/mol,指前因子为204.226min-1.MPa(-0.1609). 相似文献
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为考察高压下制备生物柴油的原料甲醇与大豆油的相互溶解度,采用高压平衡釜和静态法测定了温度为381.2~472.2K,压力为9.79~19.80MPa条件下甲醇一大豆油二元体系的液液相平衡数据,用PR状态方程对所测的液液相平衡数据进行了关联;PR方程中的参数a和b采用van der Wails单流体混合规则。采用单参数vander Waals模型计算交互参数项aij和bij二者各包含一可调参数kij和lij对可调参数kij和lij采用了与温度无关和与温度有关的2种处理方法,并用实验数据估算了可调参数值。采用与温度无关的可调参数时,用PR方程关联实验数据所得按质量分数计的均方偏差和平均偏差分别为0.0499和0.0222;用与温度有关的可调参数时,均方偏差和平均偏差相应为0.0426和0.0193。结果表明:PR状态方程适用于高压下甲醇与大豆油的液液相平衡计算。 相似文献
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Carbonization behavior of ethylene tar pitch has been studied with respect to mesophase formation by means of modification of the chemical composition of the starting materials. The hydrogen treatment of ethylene tar pitch has been carried out over the temperature range from 473 to 673 K under a pressure of 10 MPa without catalyst. Then, the hydrogenated ethylene tar pitches were carbonized at 723 K and the optical texture of the resultant cokes were assesed by optical microscopy. It was revealed that the carbonization of the ethylene tar pitch hydrogenated at 673 K gives a coke of optical texture with enlarged flow-domain. The hydrogen-transfer ability of the ethylene tar pitches during the temperature range of mesophase formation was estimated by the method of 9,10 dihydroanthracene (DHA) formation through co-carbonization of the pitch with anthracene. It was recognized that the larger the amount of conversion of DHA, the better is the development of optical texture. 相似文献