The solubility of disodium terephthalate in aqueous sodium hydroxide and in aqueous sodium hydroxide–ethylene glycol mixtures was determined experimentally by temperature analysis, gravimetry and titration. The experimental results were compared with existing literature data and the phase diagrams were determined from −25 to 70 °C. The solubility of disodium terephthalate has no considerable dependence on temperature. The freezing points of disodium terephthalate solutions vary with composition like any other solution. The solubility and freezing points decrease with increasing concentrations of ethylene glycol. Disodium terephthalate is salted out by the addition of sodium hydroxide.

An approach based on game theory is proposed to schedule security patrolling for a pipeline system. The method developed proposes numbers of patrolling paths according to the risk of security incidents on the pipeline system to allow the patrol covering high-risk segments more than low-risk segments. Patrolling of the pipeline system was modelled mathematically, based on time and distance discretization. Patrolling of a single unit that can be a motorcycle, vehicle, a drone or an helicopter was considered, depending on its velocity. The overall approach also examines the presence of security countermeasures on a pipeline system, and their effects on the patrolling schedule. The application of the method is explained by an illustrative case study.

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The lean vapor compressor (LVC) unit at Technology Centre Mongstad (TCM), Norway has been tested using 30 wt% monoethanol amine (MEA) and flue gas from the combined cycle gas turbine (CCGT) based combined heat and power (CHP) plant. The aim was to study the impact of LVC on the CO2 capture efficiency and energy profile of the TCM plant. 16 cases have been tested with and without LVC, and with various process parameters such as LVC pressure, solvent flow, inlet flue gas CO2 concentration, and stripper pressure. Absorber and stripper process conditions were recorded during these tests.The operation of the TCM amine plant was very steady. Standard deviation and reproducibility of the various process parameters were satisfactory.Overall, the LVC results are as expected. A clear trend shows lower operating LVC pressure gives less specific reboiler energy consumption. A maximum thermal energy reduction of 25% was obtained when applying LVC at the expense of a typical LVC electrical energy consumption of 0.1 to 0.2 GJ electric/ton CO2.Additional results show that the specific reboiler duty (SRD) may have a characteristic non-linear dependence on solvent flow rate. Higher stripper pressure may decrease the specific reboiler duty and be beneficial to the thermal power used in the plant at the expense of increased LVC electrical power consumption.Lower SRD was obtained when increasing the inlet flue gas CO2 concentrations both with and without LVC. For the LVC cases, no significant indication of additional energy requirement was observed when increasing the CO2 capture rate.The LVC power consumption in this study was to a large extend conservative due to a specific LVC design chosen.The presented results will help to enhance the accuracy of future CO2 capture engineering designs.

Shahid Hashemi-Nezhad Gas Processing Company (S.G.P.C.), located in Sarakhs region of Iran, processes wells that consist of the sourest gases in Middle East. The gas entering the company from gas wells includes 3.5 percent H 2 S and 6.5 percent CO 2 that is quite rare among similar wells for sweetening such large quantities as it does. As a result, greenhouse gases and their possible harmful results are sometimes unavoidable in the area. In this study, greenhouse gases in Sarakhs region, the atmosphere of the company and also the output metering of S.G.P.C. were monitored and analyzed in a three-month period, considering elimination of preliminary contaminants in the sweetening process. Later, sources, fluctuations and deviations of greenhouse gases from global standards were observed and analyzed.

The lean vapor compressor (LVC) unit at Technology Centre Mongstad (TCM), Norway has been tested. The aim of this research has been to create knowledge on the process performance of LVC on the CO2 capture efficiency and energy profile of the TCM plant. The data presented in this paper is supplementary to the study “Results of the fourth Technology Centre Mongstad campaign: LVC testing” [1]. The dataset gives unique information on the LVC campaign in which 16 cases have been tested with various campaign process parameters such as LVC pressure, solvent flow, inlet flue gas CO2 concentration, and stripper pressure. Absorber and stripper process conditions were recorded during these tests and are presented.

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