Experimental investigation and thermodynamic modeling of propane hydrate formation in presence of insoluble thermodynamic promoters

Positive applications of gas hydrates have been the subject of many studies nowadays. To make the industrial applications of these crystalline solid like compounds more feasible, some additives are normally added to the corresponding processes. Investigation of phase behavior of such systems is of interest for the industry. In the theoretical section of this work, a simple and reliable thermodynamic model were used to predicting pressure-temperature phase diagrams of the pure gas hydrates, and pure gas hydrates in the presence of water insoluble additives (CH, THP, CB, and MCH). The model is based on equality of fugacities in liquid and hydrate phases. The vdW-P is applied to model the hydrate phase. The PR for equation of state were suitable for predicting fugacity of hydrate formers in the gas phase. In the experimental part, an experimental set-up has been designed and tested. Using this apparatus, propane hydrate dissociation points in the presence of water insoluble have been measured and reported. The results of the model were compared with the experimental data. The percent of Absolute Average Deviation of model for pure propane, propane THP water, water propane CB, water propane MCH were about 3.19%, 4.10%,4.16% and 3.6%, respectively.