Absorption Edmister method

Kremser-Brown-Sherwood Method — No Heat of Absoip-tion, 108 Absorption — Determine Component Absorption in Fixed Tray Tower, 108 Absorption — Determine Number of Trays for Specified Product Absorption, 109 Stripping— Determine Theoretical Trays and Stripping or Gas Rate for a Component Recovery, 110 Stripping — Determine Stripping-Medium Rate for Fixed Recovery, 111 Absorption — Edmister Method, 112 Example 833 Absorption of Hydrocarbons with Lean Oil, 114 Intercooling for Absorbers, 116 Absorption and Stripping Efficiency, 118 Example 834 Determine Number of Trays for Specified Product Absorption, 118 Example 835 Determine Component Absorption in Fixed-Tray Tower, 119 Nomenclature for Part 2, 121... 

Edmister Method (1947). Briefly, the Edmister absorption method (1947) with a known rich gas going to a fixed tower is as follows ... 

Edmister Method (1957). Edmister has developed an improved procedure that features equations combining absorption and stripping functions as follows ... 

The Edmister method for absorption use factors for overall stripping and absorption built up by combining column top and bottom factors. 

Multicomponent distillation, 393 absorption factor method, 398 azeotropic, 420-426 bubblepoint (BP) method, 406-409 computer program references. 404 concentration profiles, 394 distribution of non-kevs. 395 Edmister method, 398,399 extractive, 412, 417-422 feed tray location, 397 free variables, number of 395 Lewis-Matheson method 404 MESH eauations. 405-407 molecular, 425-427 nomenclature, 405 number of theoretical trays, 397 packed towers, 433-439 petroleum, 411-415 reflux, minimum, 397 reflux, operating, 397 SC (simultaneous correction) method, 408-411... 

FIGURE 13.10 Nomenclature for use of the Edmister method for determining stages in absorbers and strippers. In order to maintain similarity of equations for absorption and stripping, the stages are numbered up from the bottom of the stripper. 

Edmister, W. C., Absorption and Stripping-factor Functions for Distillation Calculation by Manual- and Digital-computer Methods, A.I.Ch.E. Journal, June 1957. 

Several methods [17, 18, 29, 40, 62, 67, 223] for handling this design have been offered and each has introduced a concept to improve some feature. An approximation method combination of Kremser-Brown [40, 67] and a more complete method of Edmister [18] will be summarized. Figure 8-57 summarizes the system and terminology. The accepted nomenclature for absorption and stripping is located on page 121. 

This method [18] is well suited to handling the details of a complicated problem, yet utilizing the concept of average absorption and stripping factors. It also allows for the presence of solute components in the solvent and the loss of lean oil into the off gas. Reference 18 presents more details than are included here. Reference 18 is Edmister s original publication of the basic method for absorbers and strippers. Reference 18 also generates the... 

Edmister, W. C., Hydrocarbon Absorption and Fractionar tion Process Design Methods, Pet. Engr. May 1947-March 1949 and, Absorption and Stripping—Factor Functions for Distillation Calculations by Manual and Digital—Computer Methods. A.I.ChJE. foumal, V. 3, No. 2 p. 165 (1957). 

Edmister, W. C. (1947) Hydrocarbon absorption and fractionation process design methods, a series of articles published in the Petroleum Engineer from May 1947 to March 1949 (19 parts). Reproduced in A Sourcebook of Technical Literature on Distillation (Gulf). 

Algebraic Method for Concentrated Gases When the feed gas is concentrated, the absorption factor, which is defined in general as A = Lm/KGm and where K = t/°/x, can vary throughout the tower due to changes in temperature and composition. An approximate solution to this problem can be obtained by substituting the effective adsorption factors A, and A derived by Edmister [Ind. Eng. Chem. 35, 837 (1943)] into the equation... 

Another multistage method included in the program is the absorption and stripping factor method of Edmister (25). ASFPH, as it is called, can simulate simple and reboiled absorbers and also fractionators. The method used does not have very good convergence characteristics however, it is of value in studying plant performance data. 

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