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Transcripción del abstract original del autor: Liquefied natural gas (LNG) is a valuable fuel since it offers some environmental, energy security and economic benefits. It is obtained mainly in based load plants with high LNG production rate. However LNG may also be produced in cryogenic natural gas separation units. In this case the production rate of LNG is much lower. In the "KRIO" plant located in Odolanów, Poland, LNG is produced as an additional product. The main task of KRIO plant is the nitrogen rejection and helium recovery from natural gas. High calorific value natural gas, with methane as main component and high quality helium are the main products. Part of nitrogen rejected from natural gas is liquefied for export and the rest of nitrogen is vented into the atmosphere as a waste gas. The aim of this paper is to evaluate the influence of chosen process parameters on the performance of low temperature natural gas separation unit in the KRIO plant and on LNG production rate. Particular attention has been given to the effect of feed gas pressure and outlet produced gas pressure, taken out from cold box as well as the effect of the kind of device used for pressure reduction on liquefied natural gas production rate.