scholarly journals Determination of the chemical and hydrothermal stability of the Claus catalyst

2021 ◽  
Vol 264 ◽  
pp. 01023
Author(s):  
Farkhod Yusupov ◽  
Murodali Mamanazarov ◽  
Bobomurod Xursandov ◽  
Gulnoza Baimatova
Keyword(s):  
Thermal Stability ◽  
Water Vapor ◽  
Raw Materials ◽  
Hydrothermal Stability ◽  
Catalyst Activation ◽  
Claus Process ◽  
Tio2 Catalyst ◽  
So2 Adsorption ◽  
The Stability

The hydrothermal and thermal stability used in the Claus process are important indicators in their workflow. In this work, the stability of two catalyst samples obtained from local raw materials was studied. The samples were processed with SO2 / O2 oxides and water vapor, and their properties were studied. As a result, SO2 adsorption reduced catalyst activation. The process is reductive; the recovery of catalyst activation by reducing SO2 in the system has been determined. The stability of sulfation of MgO / TiO2 catalyst in comparison with CaO / V2O5 samples was also determined.

The issue of "oil shrinkage" during the compounding of oils in the processes of production, collection, preparation and transportation of hydrocarbon raw materials

2021 ◽  
pp. 104-113
Author(s):  
O. P. Deryugina ◽  
E. A. Trapeznikov
Keyword(s):  
Raw Materials ◽  
Raw Material ◽  
Colloidal System ◽  
Main Pipelines ◽  
Different Types ◽  
Preliminary Study ◽  
The Stability ◽  
Mixed Oil

The article discusses the issue of industrial compounding, which improves the quality of the raw materials supplied to the main pipelines. Compounding from "to compound" (English) - to mix. When mixing different types of oil obtained, "incompatibility" is possible, which is expressed in the precipitation of a solid sediment and violation of the stability of the colloidal system and due to the differing properties of oils. Attention to this problem is due to the tightening of requirements for the quality of raw materials that must comply with modern standards. The article discusses the causes of the problem of "incompatibility" of oil during compounding and effective ways of solving it, substantiates the need for a preliminary study of the properties of mixed oil in order to identify possible incompatibility of various types of oil. The standard tests for determination of incompatibility indices characterizing the ability of raw materials to mix are considered. The article substantiates the need to develop methods for diagnosing the incompatibility of oils as the most important task of modern chemical science, the solution of which will improve the quality of the raw material obtained and solve many technological problems in the compounding process.

scholarly journals Continuous low-maintenance CO<sub>2</sub>/CH<sub>4</sub>/H<sub>2</sub>O measurements at the Zotino Tall Tower Observatory (ZOTTO) in Central Siberia

2010 ◽  
Vol 3 (4) ◽  
pp. 1113-1128 ◽  
Author(s):  
J. Winderlich ◽  
H. Chen ◽  
C. Gerbig ◽  
T. Seifert ◽  
O. Kolle ◽  
...  
Keyword(s):  
Water Vapor ◽  
Accurate Determination ◽  
Field Tests ◽  
Central Siberia ◽  
Mixing Ratios ◽  
Air Sample ◽  
The Stability ◽  
Carbon Dioxide Co2 ◽  
Tall Tower

Abstract. To monitor the continental carbon cycle, a fully automated low maintenance measurement system is installed at the Zotino Tall Tower Observatory in Central Siberia (ZOTTO, 60°48' N, 89°21' E) since April 2009. A cavity ring-down spectroscopy (CRDS) analyzer continuously measures carbon dioxide (CO2) and methane (CH4) from six heights up to 301 m a.g.l. Buffer volumes in each air line remove short term CO2 and CH4 mixing ratio fluctuations associated with turbulence, and allow continuous, near-concurrent measurements from all tower levels. Instead of drying the air sample, the simultaneously measured water vapor is used to correct the dilution and pressure-broadening effects for the accurate determination of dry air CO2 and CH4 mixing ratios. The stability of the water vapor correction was demonstrated by repeated laboratory and field tests. The effect of molecular adsorption in the wet air lines was shown to be negligible. The low consumption of four calibration tanks that need recalibration only on decadal timescale further reduces maintenance. The measurement precision (accuracy) of 0.04 ppm (0.09 ppm) for CO2 and 0.3 ppb (1.5 ppb) for CH4 is compliant with the WMO recommendations. The data collected so far (until April 2010) reveals a seasonal cycle amplitude for CO2 of 30.4 ppm at the 301 m level.

scholarly journals Imobilisasi Enzim Lipase Dedak Padi (Oryza Sativa L.) Pada Karbon Aktif: Karakterisasi, dan Uji Stabilitas Kerja Enzim Imobil

2017 ◽  
Vol 5 (1) ◽  
pp. 32-36 ◽  
Author(s):  
Firdaus Firdaus ◽  
Seniwati Dali ◽  
Hendra J. Rusman
Keyword(s):  
Thermal Stability ◽  
Oryza Sativa L ◽  
Carbon Matrix ◽  
Enzyme Characterization ◽  
Relative Activity ◽  
Ph Optimum ◽  
Repeated Use ◽  
The Stability ◽  
Matrix Enzyme

This research aims to immobilization; characterize the enzyme of immobilized, test the effectiveness of the enzyme of immobilized. This research begins with the immobilization to process of enzyme lipase using activated carbon matrix, enzyme characterization covering of immobile determination of temperature and pH optimum of the enzyme of immobilized, as well as test the stability of work covering immobilized of enzyme the test thermal stability and repeated use. The results showed that the immobile of enzyme work optimally at 50oC of temperature and pH 6.5 with each activity 0.040 U/mL; research results also showed that the immobile of enzyme has higher thermal stability in comparison with the free enzyme: with the relative activity of 57.50% at the time of 45 minutes of exposure and the exposure time at 47.50% at 75-105 minutes and it can be used as many as six times with the relative activity of 52.5% in 6 times of use.

scholarly journals Karakteristik Perusahaan dan Struktur Kepemilikan Sebagai Determinan Struktur Modal, Kinerja Keuangan, serta Nilai Perusahaan

2019 ◽  
pp. 184
Author(s):  
Ida Bagus Purbawangsa ◽  
I Wayan Suana
Keyword(s):  
Firm Value ◽  
Raw Materials ◽  
Stock Exchange ◽  
Sampling Technique ◽  
Population Data ◽  
Company Value ◽  
The Government ◽  
The Stability ◽  
New Consumer

The purpose of this study was to determine the determinants of company characteristics and ownership structure as drivers, improvement of capital structure, financial performance, and firm value in consumption companies on the Stock Exchange. Population data in this study are all consumption companies that have gone public in the period of 2009 to 2016. The selection and determination of the sample in this study was conducted based on purposive sampling technique, namely the technique of sampling which was intentionally based on the criteria set by the researcher. Precise Judgment Sampling, where the sample chosen uses certain criteria that must be in accordance with the research objectives. Consumption companies are very  important companies. Companies that are able to  help  move the economy, help the government, create many jobs, but there are still many raw materials depending on imported materials. The government is expected to be able to make policies that  can  maintain  Macroeconomics, especially  the  stability  of  the  rupiah.  Improving infrastructure that can have an efficient impact on the distribution of goods and opening new consumer opportunities. Keywords: company characteristics, company value, investor  

Estimation of the performance stability of the newly developed topical haemostatic agents based on the chitosan/alginate fibrids

2016 ◽  
Vol 87 (7) ◽  
pp. 780-789 ◽  
Author(s):  
Marcin H Struszczyk ◽  
Bożena Wilbik-Hałgas ◽  
Michał Miklas ◽  
Magdalena Cichecka ◽  
Magdalena Kucharska ◽  
...  
Keyword(s):  
Medical Devices ◽  
Raw Materials ◽  
Testing Methods ◽  
Testing Method ◽  
Haemostatic Agents ◽  
Wide Range ◽  
The Stability ◽  
Preclinical And Clinical Studies ◽  
Selection Of

Designing medical devices requires a wide range of verification steps for estimation of the performance and safety. Designing the research program needs a rational selection of appropriate testing methods (in preclinical and clinical studies) for determination of the risk of potential incompatibilities resulting in adverse events. The significance of the appropriate selection of the testing method is increased in advanced medical devices. The presented research considers the verification of the functional properties of recently developed topical haemostatic agents with the use of the chitosan/alginate fibrids, based on the previously elaborated risk analysis made according to the guidelines of the PN-EN-ISO 14971:2012 and PN-EN ISO 22442-1:2008 standards. The aim of this research was to verify the stability of the performance of the newly developed haemostatic agents during storage. The defined aim of the study arose from the thesis that the appropriate selection of raw materials and a new manner of reprocessing them enabled keeping the usability of the final product for at least two years.

FUNDAMENTAL CAPITAL FINANCING OF PRODUCTION

2020 ◽  
Vol 8 (3) ◽  
pp. 74-78
Author(s):  
Farrux Zulfiyev ◽  
Keyword(s):  
Raw Materials ◽  
Economic Reforms ◽  
Equity Financing ◽  
Capital Financing ◽  
The Republic ◽  
The Stability

This article is based on the principles of shared financing of the production of raw materials. The article is aimed at financing the production of capital on the basis of equity in order to further strengthen the stability of economic reforms in the republic. At the same time, the essence of equity financing, the risks associated with it, and the efficiency of raw materials are covered

Usability of field X-ray fluorescence analyzers for determination of the chemistry of cement raw materials - using an example of Mokrá Quarry

2016 ◽  
Author(s):  
Jiří Zimák ◽  
Kristýna Dalajková ◽  
Roman Donocik ◽  
Petr Krist ◽  
Daniel Reif ◽  
...  
Keyword(s):  
Raw Materials ◽  
X Ray
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