Citation: Xiao Gang ZHANG, Guang Ying YANG, Bu Xing HAN, Xi Feng ZHANG, Hai Ke YAN. A Calorimeter for Measuring the Enthalpy of Solution of Solid Solutes in supercritical Fluids and Study of CO₂-Naphthlene System[J]. Chinese Chemical Letters, ;2001, 12(1): 79-80. shu

A Calorimeter for Measuring the Enthalpy of Solution of Solid Solutes in supercritical Fluids and Study of CO₂-Naphthlene System

Center for Molecular Sciences Institute of Chemis try the Chinese Academy of Sciences Beijing 100080

Received Date: 5 June 2000

An apparatus for measuring the enthalpy of solution of solids in supercritical fluids (SCFs) was constructed. The enthalpy of solution (ΔH) of naphthalene in supercritical (SC) CO₂ was measured at 308.15 K in the pressure range from 8~11 MPa. It was found that ΔH was negative in the pressure range from 8 to 10 MPa, and the absolute value of ΔH decreases with increasing pressure. However, ΔH became positive at the pressures higher than 10 MPa. This unusual phenomenon can be explained by clustering between CO₂ and naphthalene.
- Solution enthalpy,
- supercritical fluid,
- molecular interaction
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