مجله فرآیند نو
پیاپی 55 (پاییز 1395)

In this study, nanocomposite membranes have been fabricated to remove Cu ions from waste water by nanofiltration. Membrane were prepared by phase inversion technique. Dimethylacetamide (DMAC) and Tetrahydrofuran (THF) were used as solvent. The effect of zinc oxide nanoparticle concentration as inorganic filler additive in the casting solution on properties of PVC based nanofiltration membrane was studied. For the membrane characterization, permeability flux, pure water flux, selectivity, tensile resistance analyses were carried out. The modified membrane containing 0.2-0.3 %wt NPs showed more appropriate performance. The modified membrane containing 0.2-0.3 %wt NPs showed more appropriate performance. The modified membrane containing 0.2-0.3 %wt NPs showed more appropriate performance.

Increased consumption of crude oil and its derivatives has resulted in reduction of high quality petroleum sources. In addition, refining crude oil gives heavy cuts, which can only be used as fuel if not upgraded. Therefore, different processes have been developed for appropriate applications of such heavy residues as tar. One of the processes for upgrading tar is reduction of viscosity (visbreaking). This is performed by soaker and coil methods. In this work, the effect of increased pressure on coke yield by a new hypothesis has been introduced. Increasing pressure reduces carbon to hydrogen ratio and coke formation by preventing the release of light gaseous products and hydrogen transfer between the other components. Furthermore, the effect of time on the amount of production and viscosity variations as well as the relation between temperature and time at temperatures below viscosity conversion process temperature has been investigated.

Failure of elastomeric seals due to Rapid Gas Decompression (RGD) under high pressure is a known problem in the oil and gas industry. This phenomenon has significant importance in valves, blow out preventers and compressors. Elastomeric materials because of flexibility, resilience, ability to Self-energize and to compensate for housing tolerances, surface textures and scratches are still the first choice of sealing materials. However O-ring decomposition due to the rapid gas decompression (RGD) is a serious threat for rubbers because of their low tensile strength. In this paper, after studying the effective parameters in design of under pressure seals, design and manufacture of sour gas resistant O-rings applied in high pressure valves of a petrochemical unit (water absorption from sour gas plant of Masjed Soleyman) were investigated. The effect of structural parameters and design variables on the performance of O-rings was also evaluated.

One of the newest technologies in wastewater treatment is the combination of the biologic process with membrane separation , that is growing very fast in this industry. MBR process with combination of sedimentation unit, Aeration and filtration in a reactor, replaced instead of usual treatment process that is using for all kind of wastewater with a good efficiency in pollution removal but fouling is the most important problem in it, that decline the MBR efficiency .So founding membrane critical flux and working under this flux ,is an important help for dissolving this problem. In this lab research polymeric membrane critical flux in MBR poilot measured in RIPI for Tehran refinery of DAF unit wastewater and with using of flux step method and ther diagrams critical flux specified.

Fossil fuels are nonrenewable energy resources, which developing society will be confronted with lake of fuel in the future. Hence, in recent years, among the usable energies, electrical energy produced by the fuel cell can be considered as a promising option owing to its high efficiency and low environmental emissions as well as the use of hydrogen as a clean fuel. However, the world efforts to produce hydrogen from renewable sources is widely carried out. Whereby, in last decades, the novel solar membrane reactor (MR) technology as one of the effective ways to produce hydrogen from renewable sources has been proposed. Therefore, the main purpose of this study is the overview of hydrogen production methods and investigation of their benefits and drawbacks. Moreover, after introducing the new solar MR technology, the potentials of this technology for hydrogen production will be discussed.

In this study, after examining lab results of light naphtha streams of various units of Shazand refinery, the best naphtha stream to increasing capacity of Isomerization unit, Naphtha produced by Isomax unit was identified, of course, a series of operational changes to reduce the catalyst poisons was applied in the Isomax unit.
Mixture of naphtha with feed supplied from NHT2 (ratio of 1: 5) increased feed capacity of Isomerization unit up to 25 percent more than the current. Increasing Isomerate production generated a net profit for the company.
In Addition to the allowed amount of pesticides for input feed, the reactor feed pump capacity and Space velocity of the liquid inside the reactor as limiting the capacity isomerization unit, have been checked.

The aim of this study was to Examine the relationship between the financial Services compensation with is productivity manpower.Procedure descriptive survey of correlation. The population consists of all staff of the National Refining and Distribution company to number 714. Morgan using 250 randomly selected examples. In this study of tow questionnaire financial Services compensation and manpower productivity were used. They confirmed the validity of the use of experts and professionals and their reliability using Cronbach's alpha, respectively, 75% and 82%, respectively. To test the hypothesis Spearman test and regression analysis of variance was used . The results showed that between the financial Services compensation with dimensions (financial direct and indirect financial) with manpower productivity at the National Refining and Distribution company there is a significant relationship