نشریه مهندسی گاز ایران
پیاپی 17 (بهار و تابستان 1402)

Methanol is one of the most common chemical compounds in petrochemical industries. It is used as a fuel that is economical and has less pollution. Methanol can be converted into ether, olefin, polymer, acetic acid, vinyl acetate, etc. compounds. In this research, at first the methods of producing methane gas as the initial material of methanol, then the methods of producing methanol from carbon monoxide, carbon dioxide and methane were investigated. The synthesis of methanol from methane is carried out under thermal and radiation of light waves conditions. Which requires a temperature above 200 °C and high pressure. Various catalysts were used to adjust the reaction conditions, and that the best catalyst is copper metal derivatives. By using optimized catalysts, the formation of by-products were minimized. Also, by recording the potential spectrum of the colloidal suspension and using the density functional theory method, a mechanism for methanol production was proposed.

Today, combined heat and power generation systems have been taken into consideration by the developed country for residential use, due to reduced losses, high efficiency and help to network security. In order to use these systems in the country, the target market must be identified, then, by examining the economic conditions and creating incentive schemes to encourage residential customers to use these systems. For this purpose, in the present article, firstly, the most suitable province for the use of such systems was selected and then, by using the amount of electricity consumption and residential gas consumption, a comparison between the current system and the use of the mCHP system was made. According to the price Realistic economic analysis was carried out and further emissions of air pollutants were studied for both systems. The results show that Tehran province is the best province for this product market. Also, considering the current tariffs, the use of this system can return after six years, while the amount of pollutants production, and, from the current system are 60.9, 60.3, 54.7 And 100% more than mCHP. Finally, given the economic consideration and the need for countries to pay attention to reducing emissions, the use of the mCHP in conjunction with the Ministry of Energy’s support policies can be implemented in our country.

In this study, the AW-A well of Ahvaz oil field was investigated which is threatened due to closed flow pressure drop. The study and optimization of the AW-A well has been done by mixing three natural production options from the well, modifying the internal structure of the well by driving the tubing and applying different percentages of produced water and applying the artificial production system (with gas injection). In this study, it was tried to bring the general information related to the Black Oil route closer to the reality according to the compositional information, and then the other studies were conducted based on the Black Oil route. In this research, PIPESIM software was used to simulate the gas lift in one of the wells of the Ahvaz oil field and the effect of changing the size and depth of the tubing and comparing the effect of production from different tubings and the most optimal diameter and depth of the tubing. The most suitable and optimal option was gas lift method according to the simulation, so that the production rate can be increased to 2217 barrels per day in the current conditions of the reservoir.</em>

In this paper, the effect of Friction Stir Processing (FSP) on the enhancement of St37 properties against corrosion has been investigated. The FSP was carried out in 4 modes on St37: The first state of the process was done with a rotational speed of 900 rpm and without micro/Nano particles, the second state was done at a rotational speed of 560 rpm and with ZrO2</sub> micro particles, the third state was done with a rotational speed of 560 rpm and with ZrO2</sub> nanoparticles and the fourth state was done with a rotational speed of 900 rpm and with ZrO2</sub> nanoparticles. The traverse speed in all samples was 100 mm/min. Corrosion resistance of all 4 prepared samples was compared with the one in St37 steel Base Metal (which FSP had not been done on it). The results showed that the sample produced by FSP with ZrO2</sub> nanoparticles and rotational speed of 900 rpm has the highest increase in corrosion resistance. All Nano dispersed samples showed more corrosion resistance than the Base Metal. The two samples, the FSPed one without any particle and the FSPed one with micro particles, showed less corrosion resistance in comparison to the one in Base Metal. Increasing the rotational speed of the process led to an increase in the corrosion resistance of the sample.

Liquid Loading is one of the common problems in gas wells that can cause production to stop. This research has tried to investigate the occurrence of this phenomenon in one of Iran’s onshore condensate gas fields using PIPESIM software. In this research, the formation of liquids in the gas reservoir in the target field and the behavior of this phenomenon during production from the well and its control methods have been studied. The results of this research show the occurrence of liquid Loading in the well due to overflow in the reservoir of 2200 psi, then the critical rate of liquid loading of 6.2 million cubic feet was calculated by Pipesim software and the appropriate solutions to control the production from the well and LL It was checked by changing the diameter of the tubing and also using a choke, which showed that the use of a reducer and tubing with the right diameter can have a good effect on production control.</em>

In this research, the absorption of CO2</sub> by an aqueous solution of Amine Piperazine-Ionic liquid was investigated. The Response Surface Method (RSM) based on Central Composite Design (CCD) was used to design experiments, build models, and find optimal operating conditions to achieve optimal responses in the range of used temperature, pressure, and time. The design and optimization of this group of separation units requires to accurate equilibrium and thermodynamic data of vapor-liquid equilibrium. In this study, the optimal loading conditions of CO2</sub> gas were determined using the central composite design (CMD) method. Analysis of the equations performed using quadratic polynomial regression and ANOVA analysis of variance. Enhancement of the pressure and time and reducing the temperature cause increase the solubility of carbon dioxide gas in the amine mixture. The optimal absorption conditions were obtained at pressure 1.6 bar, temperature 21 ℃ and time 1.5 hours. Finally, the mechanism of temperature effect on solubility via Lochatelier’s principle, the effect of pressure on solubility by Henry’s law, and the effect of time on solubility by examining the kinetics of the adsorption reaction was investigated.