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Dortmund Data Bank
Thermophysical Data for Process Design
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DDB#	Name	CAS-RN	Formula
25	Ethylbenzene	100-41-4	C₈H₁₀	Overview	Details
174	Water	7732-18-5	H₂O	Overview	Details
2187	Methyldiethanolamine (MDEA)	105-59-9	C₅H₁₃NO₂	Overview	Details
3865	Piperazine	110-85-0	C₄H₁₀N₂	Overview	Details

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Mixture Data

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**Vapor-Liquid Equilibria (VLE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	4	n.a.	n.a.
174	Water		32	7
2187	Methyldiethanolamine (MDEA)			n.a.

**Heats of Mixing (HE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		7	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Gas Solubilities (GLE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	22	n.a.	n.a.
174	Water		n.a.	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Activity Coefficients at Infinite Dilution (Pure Solvents) (ACT)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	86	n.a.	n.a.
174	Water		n.a.	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Liquid-Liquid Equilibria (Miscibility Gaps) (LLE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	59	n.a.	n.a.
174	Water		n.a.	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Heat Capacities of Mixtures, Excess Heat Capacities (CPE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		69	13
2187	Methyldiethanolamine (MDEA)			4

**(A)zeotropic Data (AZD)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	9	n.a.	n.a.
174	Water		11	2
2187	Methyldiethanolamine (MDEA)			n.a.

**Solid-Liquid Equilibria (SLE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		6	7
2187	Methyldiethanolamine (MDEA)			n.a.

**Densities and Volumes of Mixtures, Excess Volumes (VE)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		145	21
2187	Methyldiethanolamine (MDEA)			n.a.

**Critical Data of Mixtures (CRI)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	2	n.a.	n.a.
174	Water		n.a.	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture Viscosities (VIS)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		157	42
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture Surface Tensions (MSFT)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		38	10
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture Speeds of Sound (MSOS)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		6	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture Thermal Conductivities (MTCN)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		1	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture Dielectric Constants (MDEC)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		4	n.a.
2187	Methyldiethanolamine (MDEA)			n.a.

**Mixture P-v-T Data (MPVT)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		67	6
2187	Methyldiethanolamine (MDEA)			n.a.

**Diffusion Coefficients (DIF)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	n.a.	n.a.	n.a.
174	Water		9	7
2187	Methyldiethanolamine (MDEA)			n.a.

**Further Thermodynamic Properties (X)**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	10	n.a.	n.a.
174	Water		18	6
2187	Methyldiethanolamine (MDEA)			n.a.

**Total**
DDB#	Name	174	2187	3865	Piperazine
25	Ethylbenzene	192	n.a.	n.a.
174	Water		570	121
2187	Methyldiethanolamine (MDEA)			4

Dortmund Data Bank Version: February 2024

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