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DOI -10.32743/UniTech.2022.104.11.14495 CLEANING EXPANSER GASES FROM CO2 AND OTHER ADDITIVES
Hamid Obidov
Doctoral student, Bukhara Engineering and Technology Institute, Republic of Uzbekistan Bukhara E-mail: vohid7@mail.ru
Vokhid Akhmedov
Cand. of tech. sciences, Professor of the Department of Chemistry Bukhara Engineering and Technology Institute, Republic of Uzbekistan, Bukhara E-mail: vohid7@mail.ru
Bobir Olimov
PhD,
docent of the Department of Chemistry Bukhara Engineering and Technology Institute, Republic of Uzbekistan Bukhara E-mail: chemistry292 7@mail.ru
ОЧИСТКИ ЭКСПАНЗЕРОВЫХ ГАЗОВ ОТ СО2 И ДРУГИХ ДОБАВОК
Обидов Хамид Олимович
докторант,
Бухарского инженерно-технологического института, Республика Узбекистан, г. Бухара
Ахмедов Вохид Низомович
канд. тех. наук, проф. кафедры химии Бухарского инженерно-технологического института, Республика Узбекистан, г. Бухара
Олимов Бобир Баходирович
PhD, и.о. доц. кафедры химии Бухарского инженерно-технологического института, Республика Узбекистан, г. Бухара
ABSTRACT
Today, the increasing demand for natural gas in the world has led to the development of knowledge about its processing and purification. This article provides information on the purification of expander gases from CO2 and H2S emitted at the "UCHQIR" gas processing plant. In this case, the expander gases were passed through various absorbent solutions. Amines chemisorb H2S and slaked lime was used to precipitate CO2.
АННОТАЦИЯ
Сегодня увеличение потребности в природном газе в мире привело к развитию знаний о его переработке и очистке. В данной статье представлена информация об очистке экспанзеровых газов от CO2 и H2S, выбрасываемых на газоперерабатывающем заводе "UCHQIR". В этом случае детандерные газы пропускались через различные растворы абсорбента. Амины хемосорбируют H2S, а известковый раствор использовали для осаждения CO2.
Keywords: natural gas, separator, dehydrator, extractor, condensate, carbon dioxide.
Ключевые слова: природный газ, сепаратор, осушитель, экстрактор, конденсат, углекислый газ.
Библиографическое описание: Obidov H., Akhmedov V.N., Olimov B.B. CLEANING EXPANSER GASES FROM CO2 AND OTHER ADDITIVES // Universum: технические науки : электрон. научн. журн. 2022. 11(104). URL: https://7universum.com/ru/tech/archive/item/14495
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In addition to its primary function as a fuel, it is a source of hydrocarbons for the natural petrochemical industry. Today, there is a lot of research going on in the field of natural gas. The main reason for this is the presence of a high concentration of methane in natural gas and the production of other potential products from it, such as synthesis gas and high-purity hydrogen[1-5].
While natural gas is generally considered a "clean" fuel compared to other fossil fuels, natural gas found in water deposits is not necessarily "clean" and free of impurities[6-9]. Natural gas consists mainly of methane, and it contains large amounts of light and heavier hydrocarbons, as well as CO2, N2, Hg, He, H2S and other additional compounds. Thus, pipelines used as consumer fuel must be cleaned of additives in order to meet quality
standard requirements, increase the calorific value of natural gas, prevent corrosion of pipes and equipment, and eliminate related technological problems[10-13].
The processing of natural gas extracted from wells into high-quality dry natural gas is quite complex and usually involves several processes. Often, the number of gas treatment steps and the type of methods used to obtain quality natural gas depend on the source and composition of the production stream along the well[14-16].
A number of operations were carried out in order to clean the additives contained in the expander gases. A technology has been developed to clean expander gases from CO2 and separate it for various purposes in industry. this technology is illustrated in picture 1.
Figure 1. Technological scheme of CO2 purification of expander gases
For the chemical purification of CO2, it is combined with Ca(OH)2 and separated in the form of CaCO3. The chemical reaction equation of the process is described below.
CO2 + Ca(OH)2 = CaCO3 j+ H2O
Most alkanolamines are widely used as chemical solvents for CO2 removal in the natural gas and oil refining industries. In these processes, alkanolamine or soluble calcium salts are used in aqueous solution.
The amine-based solvents used for the absorption process are monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA), which bind to CO2 and H2S. These amines are called weak organic bases. Amines provide basicity and are used to clean expander gases from CO2 and H2S. Hydroxide groups increase the solubility of amines in water.
In view of the above, Table 1. shows a comparison of absorption processes of chemical and physical solvents for the attachment of CO2 and H2S.
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Table 1
Comparison of absorption processes of CO2 and H2S gases
Chemical absorption
Alkanolamine Ca(OH)2 to absorb CO2
Type of absorbents MEA, DEA, MDEA CaCO3
Chemical reaction
CO2 absorption mechanism CO2: 2RNH2+CO2+H2O^(RNH3)2CO3 (RNH3)2CO3+CO2+H2O^2RNH3 HCO3 Ca(OH)2 + CO2 = CaCO3|+ H2O
Operating gauge pressure, mmHg Insensitive to pressure > 10,5
Operating temp., oC 38-200 92-120
Absorbent recovery Reboiled stripper Stripper
Swing variables (Temp. or Pressure) Temperature principally Both, but pressure principally
Selectivity CO2 vs. H2S Only MDEA selective for H2S May be selective for H2
Utility cost High Medium
In conclusion, it can be said that methane is the main component of expander gases. But due to the low pressure of these gases, they cannot be re-added to the system. Therefore, cleaning these gases from acidic parts and
delivering them to the population for use is very relevant today. Expander gases contain up to 85-87% methane gas, which after purification reaches 98-99%.
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