Phase equilibrium for binary system of diphenyl ether-supercritical carbon dioxide

doi:10.16085/j.issn.1000-6613.2018-0468

Abstract

Abstract:

In order to solve the problem of separating diphenyl ether in tar and its upgrading products, the phase equilibrium for diphenyl ether-carbon dioxide were measured at 313.15—353.15K in the pressure ranges of 8—18MPa, which provided fundamental information for designing separation process. The phase equilibrium data were measured by a flow-type visualization apparatus at high pressure. The measured data were correlated using the Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) equations of state (EOS) in combination with the mixing rules of Quadratic, Adachi-Sugie (AS) and Mathias-Klotz-Prausnitz (MKP). The correlation results demonstrated that PR and SRK equations of state with the AS mixing rule can obtain relatively accurate correlation results, whereas the traditional quadratic mixing rule lead to relatively large errors in the ranges investigated. In addition, the correlation also showed that after selecting the appropriate mixing rule, the selection of the EOS had little effect on the correlation result. It can be concluded that as for the asymmetric mixtures such as low volatility liquids and carbon dioxide, the key to simulate the phase equilibrium was the selection of appropriate mixing rules.

Key words: supercritical carbon dioxide, phase equilibria, equation of state, diphenyl ether, coal tar

摘要：

为了解决煤焦油及其轻质化产物中二苯醚的萃取精馏分离问题以及为后续的高效分离过程提供工程数据，本文自行设计并搭建了一套流动法可视化高温高压相平衡测定装置，对二苯醚-二氧化碳体系的相平衡数据进行了测定，测定温度为313.15K、333.15K和353.15K，测定压力为8～18MPa，并使用Peng-Robinson (PR)和Soave-Redlich-Kwong（SRK）状态方程结合Quadratic、Adachi-Sugie、Mathias-Klotz-Prausnitz混合规则对的超临界二氧化碳与二苯醚相平衡数据进行了关联计算，关联结果表明PR和SRK状态方程结合AS混合规则可以获得较为准确的关联结果，而传统二次型混合规则得到的计算结果误差相对较大。此外，关联计算还表明，选择合适的混合规则后，不同状态方程的关联结果相差不大。这表明，对于低挥发性的液体与二氧化碳这类非对称混合物体系，相平衡模拟计算的关键在于选取合适的混合规则。

关键词: 超临界二氧化碳, 相平衡, 状态方程, 二苯醚, 煤焦油

CLC Number:

TQ021.2

Bowen DU, Kang CHEN, Xin DING, Zhao JIANG, Tao FANG. Phase equilibrium for binary system of diphenyl ether-supercritical carbon dioxide[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1662-1670.

杜博文, 陈康, 丁鑫, 姜召, 方涛. 超临界二氧化碳与二苯醚相平衡研究[J]. 化工进展, 2019, 38(04): 1662-1670.

Figures/Tables 15

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序号	仪器名称和型号	生产厂家
1	普析G5气相色谱仪	北京普析通用仪器有限责任公司
2	CP系列先行者TM电子天平	奥豪斯仪器（上海）有限公司
3	湿式气体流量计	天津市泰斯仪器有限公司

序号	仪器名称和型号	生产厂家
1	普析G5气相色谱仪	北京普析通用仪器有限责任公司
2	CP系列先行者TM电子天平	奥豪斯仪器（上海）有限公司
3	湿式气体流量计	天津市泰斯仪器有限公司

序号	试剂名称	规格	生产厂家
1	二氧化碳	分析纯	西安泰达低温设备有限公司气体厂
2	无水乙醇	分析纯	国药集团化学试剂有限公司
3	二苯醚	≥98%	阿拉丁科技（中国）有限公司

序号	试剂名称	规格	生产厂家
1	二氧化碳	分析纯	西安泰达低温设备有限公司气体厂
2	无水乙醇	分析纯	国药集团化学试剂有限公司
3	二苯醚	≥98%	阿拉丁科技（中国）有限公司

数据来源	压力 /MPa	x ₁	S_x /%	压力 /MPa	y ₁	S_y /%
Chung等^[29]测定	7.81	0.571	—	7.39	0.9982	—
	9.89	0.599	—	8.32	0.9911	—
	13.52	0.625	—	9.13	0.9885	—
	19.04	0.665	—	11.09	0.9807	—
	19.26	0.665	—	12.75	0.9751	—
	23.40	0.692	—	15.40	0.9687	—
	28.25	0.776	—	17.69	0.9838	—
				21.33	0.9560	—
				26.39	0.9419	—
本文测定	8.3	0.5646	2.82	8.3	0.9994	0.03
	10.3	0.60875	2.36	10.3	0.9897	0.02
	12.2	0.6228	2.49	12.2	0.9849	0.03
	14.0	0.6361	1.13	14.0	0.9779	0.04
	17.0	0.6598	1.03	17.0	0.9628	0.05