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Dortmund Data Bank Thermophysical Data for Process Design Contact: ☎ +49 441 361819 0 or ✉ info@ddbst.com

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DDB#	Name	CAS-RN	Formula
1621	Pyrazine	290-37-9	C4H4N2	Overview

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Pure Component Data

Property	Points	Sets	Temperature Range	States	Sets
Critical Data	1	1	(hidden)	Critical Point	1
Density	12	3	333-627 K	Liquid	2
				Gas/Vapor	1
Entropy (S-S0)	43	5	5-380 K	Crystal 4	1
				Crystal 3	1
				Crystal 2	1
				Crystal 1	1
				Liquid	1
Heat of Fusion	2	2	(hidden)	Crystal 1 > Liquid	1
				Solid-Liquid	1
Heat of Sublimation	1	1	298-298 K	Vapor-Solid	1
Heat of Transition	4	4	301-310 K	Crystal 2 > Crystal 1	2
				Crystal 3 > Crystal 2	1
				Solid-Solid	1
Heat of Vaporization	12	3	298-420 K	Vapor-Liquid	2
				Vapor-Solid	1
Melting Point	3	3	(hidden)	Solid-Liquid	3
Molar Heat Capacity (cP)	176	15	6-628 K	Crystal 2	4
				Crystal 1	4
				Liquid	4
				Crystal 4	1
				Liquid Phase of VLE	1
				Crystal 3	1
Standard Heat of Sublimation	2	2	298-298 K	Crystal 2-Vapor	1
				Crystal 1-Vapor	1
Std. Heat of Combustion	4	4	298-298 K	Solid	2
				Crystal 1	1
				Gas/Vapor	1
Std. Heat of Formation	7	7	298-298 K	Gas/Vapor	4
				Solid	2
				Crystal 1	1
Transition Temperature	4	4	(hidden)	Crystal 2 > Crystal 3	1
				Crystal 4 > Crystal 3	1
				Crystal 3 > Crystal 2	1
				Crystal 2 > Crystal 1	1
Vapor Pressure	50	7	275-426 K	Vapor-Liquid	4
				Crystal 2-Vapor	1
				Crystal 1-Vapor	1
				Vapor-Solid	1
Octanol-Water Partition Coefficients	5	5	296-298 K

Pure Component Properties Data Bank Information Page

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