• H2s phase diagram diagram base website phase diagram

    H2s phase diagram diagram base website phase diagram

    A binary system is capable of showing many factors of system and for system of known composition and temperature which is at equilibrium state there are majorly three type of information available as given below:.

    Phase diagrams are able to define number of phases present in any system and it has a feature called the temperature composition point and to get number of phases present in that system we just have to locate temperature composition point on the diagram and number of phases present at that point will be total number of phases present.

    For example, an alloy of composition x at temperature T would be located at point O, as this point is within the two phase region, both solid and liquid phases will be present. Initial step to find phase composition is to find the temperature composition point on the phase diagram. If only one phase is present, the procedure is trivial, the composition of phase is simply the same as the overall composition of alloy.

    For example, in above diagram at point L, only solid phase is present. If the temperature composition point is traced at a particular temperature in two phase regions, we have to draw a line called ,Tie line. Tie line is a horizontal line drawn at a particular temperature in the two phase region of a binary phase diagram, this line is extended across the two phase region and terminate at the phase boundary lines on either side. Composition of the these phases can be understood after drawing perpendiculars from the intersection between the tie line and the phase boundaries to the horizontal composition axis.

    Thus we have to determine the composition of both of solid and liquid phase.

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    The intersection of tie line and phase boundaries are point-L and S for liquid and solid phase respectively. Therefore, composition of solid phase in equilibrium with liquid phase at temperature T for the alloy is z and x respectively. The relative amounts of the phases at equilibrium may also be computed with the aid of phase diagrams.

    h2s phase diagram diagram base website phase diagram

    The solution is simple in the single phase region. Since only one phase is presentThe alloy is composed entirely of that phase, that is, phase fraction is 1. If the composition-temperature position is traced within two phase region, things are more complex. The tie line must be utilized in conjunction with a procedure that is often called the lever rule.

    Lever rule derived from mass balance gives the relative amounts of the coexisting phases. It is applied as follows. The tie line is treated as a lever arm with the fulcrum as the overall composition. For the arm to be horizontal, weight to be hung at each end must be proportional to the arm length on the other side of the fulcrum.

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    The weight at each end corresponds to the amount of the phases at the end. To understand the lever rule let us consider a binary equilibrium phase diagram of two elements A and B in above diagram, which are completely soluble in each other. Let P be the alloy composition of interest and its weight fraction of B in A be y. Let T be the temperature of interest and let us construct a tie line at temperature T from the liquid line to the solidus line.

    At temperature T, the alloy P consist of mixture of liquid of x weight fraction of B and solidus of z weight fraction of B.

    Some of the most important information obtainable from phase diagrams are as follows. Read Applications of phase diagrams here. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Airbags Need of airbags Working of airbags. Classification of solid materials. What is Electric fan how electric fan works?

    Line defects Line imperfections in crystals. Surface defects in solid crystals. Mechanical Engineering.In the last Tips of the Month, we discussed the phase behavior of water- sweet natural gas and water- sour natural gas mixtures.

    The water content of a gas depends on the system temperature, pressure and composition of the gas. Figure 1 presents the water content of hydrogen sulfide predicted by ProMax [1] as a function of pressure and temperature. At low pressure the water content tends to decrease with increasing pressure, which is as expected. Eventually a pressure is reached where the H 2 S is liquefied.

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    On this plot this is represented by the discontinuity in the curve and a broken line joins the phase transition. There is a step change in the water content when there is a transition from vapor to liquid. In the case of hydrogen sulfide the water content of the H 2 S liquid is greater than the coexisting vapor. This is contrary to the behavior for light hydrocarbons where the water content in the hydrocarbon liquid is less than the coexisting vapor.

    Figure 2. There are several methods available that can be used to predict the water content of acid gases. All of these methods are based on equation of state and rigorous thermodynamic models.

    As described above, the phase behavior is complicated and extra care should be taken to assure a correct prediction. In the remaining section of this tip, we will demonstrate the capabilities of some of these methods. The composition of the acid gas stream is shown in the inset of diagram. Even though at low pressures, all methods give close results, as can be seen from this figure, there are large differences at higher pressures. Table 1.

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    The upper part of this table reports the measured mole percent of the feed stream and the lower part shows the experimental vapor stream compositions in mole percent. For each vapor stream, the saturated water content was predicted by the above methods and is presented in the lower portion of this table. As can be seen from this table, ProMax predict saturated water content reasonably well.

    The red figures in Table 2 indicate that the methods predict a non-aqueous liquid phase instead of the vapor phase. Figure 4 also compares the accuracy of the above methods graphically. This figure clearly indicates that ProMax gives the most accurate results.

    Categories: Gas ProcessingRefining. View all posts by: Dr. Mahmood Moshfeghian. In this TOTM, we will revisit the acid gas-water phase behavior system.

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    Specifically, different methods of predicting water content of acid gas systems are […]. Those ideas also served to become easy way to be certain that other individuals have the same dream like my personal own to know the truth more and more when it comes to this problem. I am sure there are thousands of more pleasant moments up front for individuals who check out your blog post.

    Hi, i believe that i saw you visited my website thus i got here to return the prefer?. I am attempting to find things to enhance my website! I guess its good enough to make use of some of your concepts!! My web site bing. Acid Gas-Water Phase Behavior. Did you enjoy this post?The figure below shows an example of a phase diagramwhich summarizes the effect of temperature and pressure on a substance in a closed container.

    Every point in this diagram represents a possible combination of temperature and pressure for the system. The diagram is divided into three areas, which represent the solid, liquid, and gaseous states of the substance.

    The best way to remember which area corresponds to each of these states is to remember the conditions of temperature and pressure that are most likely to be associated with a solid, a liquid, and a gas. Low temperatures and high pressures favor the formation of a solid.

    Gases, on the other hand, are most likely to be found at high temperatures and low pressures. Liquids lie between these extremes. You can therefore test whether you have correctly labeled a phase diagram by drawing a line from left to right across the top of the diagram, which corresponds to an increase in the temperature of the system at constant pressure.

    When a solid is heated at constant pressure, it melts to form a liquid, which eventually boils to form a gas. Phase diagrams can be used in several ways. We can focus on the regions separated by the lines in these diagrams, and get some idea of the conditions of temperature and pressure that are most likely to produce a gas, a liquid, or a solid.

    We can also focus on the lines that divide the diagram into states, which represent the combinations of temperature and pressure at which two states are in equilibrium. The points along the line connecting points A and B in the phase diagram in the figure above represent all combinations of temperature and pressure at which the solid is in equilibrium with the gas.

    At these temperatures and pressures, the rate at which the solid sublimes to form a gas is equal to the rate at which the gas condenses to form a solid. The solid line between points B and C is identical to the plot of temperature dependence of the vapor pressure of the liquid. It contains all of the combinations of temperature and pressure at which the liquid boils. At every point along this line, the liquid boils to form a gas and the gas condenses to form a liquid at the same rate.

    The solid line between points B and D contains the combinations of temperature and pressure at which the solid and liquid are in equilibrium. At every point along this line, the solid melts at the same rate at which the liquid freezes. The BD line is almost vertical because the melting point of a solid is not very sensitive to changes in pressure.

    For most compounds, this line has a small positive slope, as shown in the figure above. The slope of this line is slightly negative for water, however. As a result, water can melt at temperatures near its freezing point when subjected to pressure.

    The ease with which ice skaters glide across a frozen pond can be explained by the fact that the pressure exerted by their skates melts a small portion of the ice that lies beneath the blades. Point B in this phase diagram represents the only combination of temperature and pressure at which a pure substance can exist simultaneously as a solid, a liquid, and a gas.

    It is therefore called the triple point of the substance, and it represents the only point in the phase diagram in which all three states are in equilibrium. Point C is the critical point of the substance, which is the highest temperature and pressure at which a gas and a liquid can coexist at equilibrium.Search results will return only those chemical systems that contain the components as typed.

    h2s phase diagram diagram base website phase diagram

    Example: If you typed in "Si-C", the result set will contain only records where the chemical system is exactly C-Si. Search results will return all of those records with chemical systems containing all the chemical elements or chemical compounds entered in the text box, but nothing else. This differs from the "Equals" search in that it allows elements entered as search terms to be found in compounds. Search results will return all records with chemical systems containing any of the elements or compounds entered in the text box, but no other elements or compounds.

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    Component List Enter the search component manually or by selecting from the Component drop-down list below, using a space or hyphen if entering more than one in any order. Enter the chemical symbols for elements correctly using appropriate upper- and lower-case letters. The database assumes that all numbers appearing in chemical formulas for compounds are subscripts. For example, to find all systems containing zirconium oxide, enter ZrO2or Zr-O.

    See the Help Page for Chemical System Designation rules, which determine the list of searchable components. Chemical system classifications are designed generally to name the simplest possible chemical components and these are not necessarily the end-members of the diagram.

    Mixed compounds are not used in the assignment of chemical systems with the exception of oxides of elements that are not solids at ambient temperature e. The simplest components are frequently those compounds that would be used in the laboratory to synthesize the more complex compound.

    Not Containing The user can narrow a search by entering a chemical element e. An example of a combination of Not Containing components is O-N. This will result in the exclusion of any chemical system with oxygen, an oxide component Al2O3, SiO2elemental N, or an N-containing component Si3N4.

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    Ag-Bi FTlite. Ag-Bi SGnobl. Ag-Bi SGsold.Federal government websites often end in. The site is secure. The diagrams serve as maps of the equilibrium chemical and structural behaviors exhibited by materials non-organic, non-metallic and provide critical starting information for the rational design of processing schemes, for quality assurance efforts, for optimization of physical and chemical properties, and for the development of new materials.

    Version 4. The phase diagrams can be viewed and manipulated interactively; in addition, all PED Figures are available as complete. Users are able to perform keyword searches of the critical evaluations of all PED Figures, allowing them to associate material systems with any potential applications mentioned by Contributing Editors in the commentary text.

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