Nitrobenzena merupakan senyawa aromatik turunan benzena. Penelitian ini ditujukan untuk menyelidiki pengaruh rasio asam sulfat terhada pasam nitrat dalam produksi nitrobenzena menggunakan asam campuran. In this paper, attempt has been made to bring out the features of helium liquefiers, to discuss the peculiarities of the properties of helium fluid and the materials of construction at temperatures near the normal boiling point of helium that need to be addressed in performing steady state and dynamic simulation. Process simulator with appropriate Equation of State for thermodynamic properties of the fluid, appropriate models for transport and thermo-physical properties of helium and the structural materials helps in modeling and simulation of such plants. Transient analysis helps in design of such plants through improved understanding of the processes leading to optimal designs and appropriate strategies for mitigating the effects of fluctuating heat loads. Large-scale helium liquefaction/refrigeration plants have thermodynamically more involved configurations than Collins cycle that is the fundamental cycle for liquefaction and are used for cooling superconducting magnets etc.
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