A highly exothermic nitrogen generation system (NGS) can be achieved by mixing solutions of sodium nitrite and ammonium chloride, a process used by the oil and gas industry to dissolve paraffin wax and gas hydrates. Although its main products are nitrogen gas and a sodium chloride brine, the NGS has a side reaction that produces nitrogen oxides. To optimize this process to ensure the greatest and fastest heat generation with the lowest oxide production, this reaction was checked by infrared spectroscopy and calorimetry. The factors temperature, pH, and initial concentration of nitrite and ammonium were evaluated, and the optimal conditions of the NGS were determined by the constructed models to predict heat and NO generation. These conditions were a ratio of ammonium/nitrite equal to 1 and a catalyst concentration of 0.07 mol·L (for a case in which the temperature is 5 °C).
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6933760 | PMC |
| http://dx.doi.org/10.1021/acsomega.9b03044 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synthesis and characterization of advanced Ad-UiO-66@NGO composite for efficient CO capture and CO/N adsorption selectivity.
Environ Res
January 2025
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran.
Highly effective adsorbents, with their impressive adsorption capacity and outstanding selectivity, play a pivotal role in technologies such as carbon capture and utilization in industrial flue gas applications, leading to significant reductions in greenhouse gas emissions. This study aims to synthesize advanced composites via solvothermal methods, incorporating a defective Zirconium-based MOF and amine-functionalized graphene oxide. The main objective is to enhance the CO adsorption capacity of the composite and improve its CO/N separation selectivity.
View Article and Find Full Text PDFZnCl-doped mesoporous silica nanoparticles prepared via a simple one-pot method for highly efficient nitrate removal.
Environ Res
December 2024
Integrated Science and Technology Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket, 83120, Thailand. Electronic address:
Nitrate is a crucial nutrient in the natural nitrogen cycle. However, human activities have elevated nitrate levels in aquatic ecosystems beyond natural thresholds, posing risks to human health and the environment. In this work, ZnCl-doped mesoporous silica nanoparticles (ZnCl@MSN) were synthesized using a one-pot preparation method, leading to a streamlined process with reduced time and energy consumption.
View Article and Find Full Text PDFUnderstanding the interaction mechanisms of active compounds extracted from Tabernaemontana penduliflora on the surface of magnetite (111) nanoparticles in aqueous medium by DFT and MD approaches.
J Mol Graph Model
March 2025
Center of Excellence African on future Energies and Systems Electrochemical (ACE-FUELS), University Federal Technology, PMB 1526, Owerri, State from Imo, Nigeria.
Computational techniques have been used to analyze the molecules of 10-hydroxycoronahydine (HC) and voacangine hydroxyindolenine (VH) molecules with the aim of studying the effect of base and temperature on their interaction mechanisms during synthesis green magnetite nanoparticles. Density functional theory (DFT) descriptors such as: energy gap, overall reactivity descriptors, dipole moment and adsorption energy have all been explored in depth to understand the nature of the interaction. The DFT results showed that the molecules studied (HC and VH) are interactive and stable in an aqueous medium, due to the fact that these molecules have free electronic doublets on the nitrogen atom and the bond of the aromatic ring.
View Article and Find Full Text PDFVersatile waste wood-chitosan composites for 2,4-D and paraquat adsorption: Isotherm modelling and thermodynamic evaluation.
Chemosphere
February 2025
Inorganic Materials Research Laboratory, Department of Chemistry, Trent University, 1600 West Bank Dr., Peterborough, ON, Canada, K9J 7B8. Electronic address:
2,4-dichlorophenoxy acetic acid (2,4-D) and 1,1-dimethyl-4,4-bipiridinium chloride (paraquat) are among the most widely used herbicides and are known to be toxic. Fabrication of green adsorbents which are capable of removing both herbicides remains a challenge. Here, we fabricate a novel adsorbent from tropical waste wood and use a facile, chitosan-mediated N-heteroatom functionalization technique to augment surface nitrogen and improve specific surface area.
View Article and Find Full Text PDFThe Electronic Properties and Adsorption Performance of LDH/Graphene, and LDH/g-CN for the Removal of Pharmaceutical Contaminants: A Molecular Dynamics Simulation.
Int J Mol Sci
November 2024
School of Engineering and Design, Atlantic Technological University, Ash Lane, F91 YW50 Sligo, Ireland.
Water shortages and pharmaceutical pollution are two interconnected crises that pose severe threats to global health, environmental sustainability, and economic stability. Pharmaceutical pollution is widespread and has reached potentially toxic levels in over 258 rivers in 104 countries. So far, more interest has been paid towards efficient water treatment processes in recent years.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!