ࡱ> wyvzq` JbbjbjqPqP ::YO::::fFfFfFfFZG2HNNNNnnn$h +of8noo+::NN@szszszox:"NNszoszsz:],\rNH (fF+t0 V0R[x n"nsz oonnn++cznnnoooo?fFfF:::::: Gasliqnew.doc 3-12-05 CHAPTER 13 Gas-Liquid Systems This chapter will focus on the systems where a dissolved gas contacts a liquid. In most cases the dissolved gas will undergo a reaction in the liquid phase. Systems where no reaction occurs are known as physical absorption while the systems where reaction occurs are referred to as chemical absorption. First we provide some examples of application areas where gas-liquid systems are encountered in the field of environmental reaction engineering. This is followed by a discussion of the types of equipment used for gas-liquid contacting. The theory of gas-liquid mass transfer and design of such systems then follow. Application Areas FCC Off Gas Cleaning FCC (Fluid catalytic cracking) off gas from the catalyst regenerator is a major source of pollutants in oil refineries. These gases contain SO2 (quantity depends on the sulfur content of feed), and NOx. These gases are treated in a spray column. The spray is water with the other additives such as alkali, caustic soda or lime. A typical complete flowsheet for the process is shown in Figure 1. The design also removes particulate matter present in the off gas as well as NOx. The pressure drop is low due to the open design. FIGURE 1. FCC Off-Gas purification (to be added) Wet Gas Scrubbing This process is useful for highly diluted SO2 from flue gases. The process uses a concentrated sodium sulfite solution. The absorbed SO2 is thermally released from the bisulfite solution in an evaporator/crystallizer. SO2 emerges as a concentrated gas containing 95% SO2 by volume. This can be converted to elemental sulfur, liquid SO2 or sulfuric acid. A typical flowsheet is shown in Figure 2. FIGURE 2. SO2 removal by wet gas scrubbing H2S removal and spent caustic oxidation Caustic solutions are often used to treat H2S and mercapten containing gas streams. This is an example of a gas-liquid reaction. The sulfides are formed as a result of reaction of caustic solution with the sulfur bearing compounds. This waste stream is highly toxic with high COD. Hence, the spent caustic solution has to be oxidized to form thiosulfate/sulfate. The treated stream is then suitable for wastewater treatment unit. A typical flow chart for spent caustic oxidation is shown in Figure 3. A series of mechanically agitated vessels are used as reactor here. FIGURE 3. Spent caustic oxidation Other applications include air/steam stripping of VOC from wastewater, ozone treatment, etc. Common types of reactors. Common reactors and their brief merits and demerits are discussed below: Packed columns: Liquid and gas flow over a column filled with packings with the flow usually in a countercurrent manner. The design of such equipment need pressure drop calculations and establishment of flooding limits in addition to a mass transfer and reaction analysis. A column is said to flood when the gas flow is sufficient to blow the liquid against gravity and the column can not be operated at these flow rates. Gas pressure drop is usually low with packed columns. A variety of packings are available to suit the system requirements. The system is not suitable if the gas contains suspended solids. Bubble columns: Mixing is caused by the gas flow alone and no additional energy input is necessary. The advantages are simplicity in construction, no moving parts and minimum energy requirements compared to other contactors. Disadvantage is the high pressure drop of the gas due to hydrostatic head of the liquid. Considerable backmixing of the liquid occurs here. Liquid hold up is high in these reactors and hence these are suitable for slow reactions in the liquid. Mechanically agitated contactors: the liquid is agitated by an impeller. System has large liquid holdup and consumes considerable power. Very efficient mixing, moving parts require maintenance. Very suitable for small scale systems in pollution prevention and also for batch or near batch operations. As an example we note that the black liquor oxidation (Na2S solution) is carried out in a series of stirred vessels. Spray columns: Liquid is dispersed in the form of fine spray into an empty column with gas upflow. The system is suitable for highly soluble gases, can also handle gas streams containing suspended impurities. Ultra low pressure drop for the gas phase. Some limitations are energy input to spray the liquid; low mass transfer efficiency due to bypassing and droplet coalescence and liquid entrainment in the gas phase. As an example, we note that the spray columns are used for SO2 removal from FCCU flue gases because the gas stream contains suspended solids and also because SO2 has a high solubility in the aqueous phase. Fundamentals of gas-liquid mass transfer The essential concepts to describe the gas-liquid mass transfer are: Henrys law The two film model Henrys law: Henrys law describes the equilibrium concentration in the liquid exposed to a gas containing a solute. Various forms are used for Henrys law. These were summarized in Chapter 3 and students should recall them at this stage. Two common definitions will be used here. y = mx where m is the ratio of mole fraction in the gas to that liquid at equilibrium. P = HC where H is the ratio of gas phase partial pressure to concentration in the liquid at equilibrium. The unit for H is then Pa.m3/mole or atm.m3/mole. Two film model: The basic postulate is the existence of stagnant boundary layers on either side of the gas-liquid interface. Hence the terminology two film and these are referred to as gas film and liquid film. Concentration gradients are assumed to exist only in the films. Outside the film, the phases are assumed to be at uniform concentration and are referred to as gas bulk and liquid bulk. A mass transfer driving force is defined for transport in the gas film liquid films individually. In the next section, we show how to combine this into an overall mass transfer coefficient.      where x* = hypothetical equilibrium value corresponding to y = y / m xI, yI are the interfacial mole fractions on the liquid side and gas side of the interface respectively. Interface is assumed to be in equilibrium. The mole fractions in the bulk gas are denoted as y and that in the bulk liquid as x.  EMBED Equation.3  by Henrys law assuming interface to be in equilibrium NA = mass transfer rate per area =  EMBED Equation.3  where kx and ky are mass transfer coefficients based on mole fraction driving force. Overall coefficient is defined as  EMBED Equation.3  we find from the above equations:  EMBED Equation.3  Alternative way of writing the transfer rate is:  EMBED Equation.3   EMBED Equation.3 = mx = hypothetical gas phase value corresponding to the bulk liquid.  EMBED Equation.3  Note that  EMBED Equation.3  Hence  EMBED Equation.3  Mass transfer coefficients can also be based on concentration driving force:  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  = total molar concentration in the liquid Mass transfer coefficients for the gas phase is often based on gas phase partial pressure.  EMBED Equation.3   EMBED Equation.3  The overall coefficient KL based on concentration driving force is then given as  EMBED Equation.3  Similarly the coefficient KG based on gas phase partial pressure as a driving force is given as  EMBED Equation.3  where H is in units of Pa m3/mole. Various definitions and inter-relationships should be noted. Example 1: At a point in a gas absorption column, we have air and water in contact. The solute is H2S and the partial pressure of H2S in the air is 5% and the concentration of H2S dissolved in water is zero. Find the rate of mass transfer if the gas side and liquid side mass transfer coefficients are as follows: kL= 2x10-4 m/s kg = 6x10-6 mole/m2 Pa s Also find the overall transfer coefficient and express in terms of (a) an overall partial pressure driving force and (b) a liquid phase concentration driving force. Solution: Henrys law solubility coefficient of H2S is needed and the value used here is 1950 Pa m3/mol. Overall transfer coefficient based on partial pressure driving force is KG and is calculated as  EMBED Equation.3  KG =1x10-7 mole/Pa m2 s Rate of absorption = KG PG = 1 x 10-7 x 0.05 x 1 x 105 = 5.09x10-4 mole/m2 s Similarly KL =1.95 x10-4 m/s which is close to kL. Hence it is seen that the major resistance to transport lies in the liquid side of the film for this case. Gas-liquid Reaction : First order reactions. Model equations for transport in the film.  EMBED Equation.3  (1) where k1 is the rate constant for the reaction. It is convenient to normalize the equation by defining the following dimensionless variable.  EMBED Equation.3  Dimensionless representation of Eq (1) is then  EMBED Equation.3  where Ha2 is (2  EMBED Equation.3  Ha is an important dimensionless group for gas liquid reactions and is known as the Hatta number. The physical significance of the Hatta number can be gauged by expressing it as a rate of two terms constants  EMBED Equation.3  Thus a large value of Hatta number implies that diffusion time is much larger than reaction time and hence we would expect considerable reaction to take place in the film itself. The concentration will drop significantly in the film for large values of Hatta number. The solution to Eq. (1) will refect these effects and is presented below: We use the following boundary conditions for Eq(1). At x = 0, A = A* or a = 1 At x = (, A = A0 or a = a0 where A0 is the concentration of dissolved A in the bulk liquid. The solution is then given as:  EMBED Equation.3  Typical concentration profiles are shown in Fig 4 as a plot of a vs y for two values of Ha. For small values of Ha, some unreacted gas diffuse into the bulk. For large Ha all the dissolved gas reacts in the film.  1  a  A0  0 (  (a) Solution for small values of Ha  A*  a   0 (  (b) Solution for large values of Ha FIGURE 4. First-order reaction, film model (a) Solution of small Ha (b) Solution of large Ha The flux of A at the interface is obtained by applying Fick's Law at the interface.  EMBED Equation.3  and is given by  EMBED Equation.3  (A) Similarly the flux into the bulk liquid is  EMBED Equation.3  and the result is:  EMBED Equation.3  (B) The bulk liquid concentration has to be obtained by consideration of the processes in the bulk liquid and cannot be set arbitrarily. To illustrate how this is calculated, consider absorption in a completely backmixed liquid. The system can be schematically represented as shown in the following figure.  Gas   QL QL Liquid Assume that a pure gas is bubbled into the liquid so that there is no change in the gas phase partial pressure of reactant A. The interfacial concentration is therefore maintained at A*. Liquid enters with a dissolved gas concentration Ain (usually zero) and leaves with a concentration Aout. The liquid volumetric flow rate is QL. The volume of the system is V and agl is the gas-liquid transfer area per unit volume of contactor. Then writing a mass balance for bulk liquid yields: In - Out = Reacted  EMBED Equation.3  Equation can be made dimensionless by defining the following parameters:  EMBED Equation.3  Also  EMBED Equation.3  can be substituted from Eq(B) yielding  EMBED Equation.3  (C) where we set Ain = 0 for simplification. Solution of Eq (C) gives the following equation for bulk liquid concentration of A.  EMBED Equation.3  For example, Ha = 1,  EMBED Equation.3  = 1.5 and  EMBED Equation.3  = 10 We find a0 = 0.09841 For large Ha, a0 ( 0 indicating that film reactions dominate. Gas Liquid Reactions, Second order reactions. For the reaction scheme A + ( B ( products, the differential equations in the film can be set up as follows  EMBED Equation.3   EMBED Equation.3  We introduce the following dimensionless variables  EMBED Equation.3  The value of A* depends on the magnitude of the gas film resistance. The two cases are shown in the following figure  Gas film Liquid film  pg A*=pg/H  Case 1: No gas side resistance  pg A*=pg/H pgi  A* Case 2: With gas film resistance FIGURE x: concentration drop in the gas film showing the effect of gas film resistance. For case (1), A* is the interfacial concentration while for case (2) A* is equivalent to bulk gas concentration. A* = pg / H where pg is the partial pressure of A in the bulk gas. Enhancement Factor is defined as  EMBED Equation.3  and it is a measure of rate of absorption of A into the liquid. Interfacial Concentration of B Equations for diffusion and reaction for transport of A and B can then be reduced to dimensionless form as;  EMBED Equation.3  (1)  EMBED Equation.3   EMBED Equation.3  (2)  EMBED Equation.3  The parameter Ha2 is now defined as:  EMBED Equation.3  The additional parameter is now q which is an effective concentration ratio of reactant B to A. The relative magnitude of Ha and q determines the concentration profiles in the film. Complete solution can be done only numerically and here we present approximate analytical solutions. First, we note that if the interfacial concentration of B denoted as Bi is nearly the same as Bo, the bulk concentration, then the problem reduces to a first order reaction. The enhancement factor is then given as  EMBED Equation.3  This will be referred to as a no depletion case or the fast pseudo-first order case. Combining Eqs(1) and (2) we find that a and b are related by:  EMBED Equation.3  (3) Also  EMBED Equation.3  or  EMBED Equation.3  Hence the enhancement factor is  EMBED Equation.3  Integrating Eq (3) once we have  EMBED Equation.3  Using the boundary values at y = 0, we obtain - ( = 0 + c1 Hence c1 = - ( Integrating a second time a = qb - (y + c2 At y = 1 0 = q - ( + c2 or c2 = ( - q Here we assume that the reaction in the bulk is rapid so as to keep a zero concentration of dissolved a. Therefore a = qb - (y + ( q The interfacial concentration of B is obtained for case (1) (No gas film resistance) directly by substituting a = 1, y = 0 and rearranging the above equation. The result is  EMBED Equation.3  (4) or in terms of dimensional variables  EMBED Equation.3  Hoftizer-van Krevelen, Hikita and Asai suggest that the pseudo first order equation can still be used in presence of depletion provided the Ha parameter is now based on Bi and not B0  EMBED Equation.3  Ha2 (depletion) = Ha.bi Therefore the enhancement factor in presence of depletion can be calculated as  EMBED Equation.3  (5) Simultaneous solution of (4) and (5) is necessary for this case. This procedure is again quite general except for the assumption of fast reaction in the bulk and some error associated with the Hikita-Asai approximation for the rate. Eq. (4) and (5) can be combined to give an expression for bi.  EMBED Equation.3  (6) Calculation procedure is illustrated by the following problem. --------------------------------------------------- Problem 2 Lo-Cat is a gas treating process that removes hydrogen sulfide out of gas streams and converts to solid sulfur. In this process, chelated iron Fe(3+) EDTA solution is used as a reactant. A simple representation of the reaction is H2S(g-l) + 2Fe+++ ( 2H+ + S0 + 2Fe++ Find the rate of absorption of H2S for the following process conditions. Partical pressure of H2S in the gas phase = 0.05 atm, concentration of Fe+++ in the liquid = 60 mol/m3 The kinetic parameters and physico chemical properties are as follows: DA = 1.44 x 10-9 m2/s DB = 0.54 x 10-9 m2/s Henrys law constant = 1950 Pa m3/mol Reaction rate constant = 9 m3/mol s The mass tranfer coefficient kL = 2 x 10-4 m/s for liquid film Ignore the effect of gas side resistance as an approximation. Solution  EMBED Equation.3  = 2.56 mol/m3  EMBED Equation.3   EMBED Equation.3  (note ( = 2 here) All units are in S.I. here and therefore consistent. Solving Eq. (6) for bi, iteratively one finds bi = 0.5085. Hence the concentration of Fe+++ at the interface is only 50% of that in the bulk liquid. Hence the enhancement factor is  EMBED Equation.3  Rate of absorption of H2S = ( kL A* = 3.12 x 2 x 10-4 x 2.56 = 0.0016 mol/m2 s -------------------------------------------------------- Regimes of absoprtion Consider eq.(6) which can be expressed as  EMBED Equation.3  as an approximation if  EMBED Equation.3 > 3. From equation (2) we find that as Ha increases in comparison with 1 + q, the depletion increases significantly. Based on this the following two criteria are suggested:  EMBED Equation.3  complete depletion (bi = 0) Here ( tends to an asymptotic value of 1+q.  EMBED Equation.3  no deplection (bi ( 1) (pseudo first order reactions) Here ( tends to Ha. A typical EMBED Equation.3  vs ( for a given q then looks like this: (  ( = 1+q regime  ( = Ha regime  Ha Effect of gas film resistance. The boundary condition at x = 0 is now represented as  EMBED Equation.3  (6) We have  EMBED Equation.3  Let  EMBED Equation.3 equilibrium concentration of A corresponding to bulk gas partial pressure. Eq (6) can be expressed in dimensionless form as  EMBED Equation.3  where  EMBED Equation.3  The parameter q is now defined as  EMBED Equation.3  The enhancement factor is now  EMBED Equation.3  Then the following set of equations van be derived for calculating bi and (  EMBED Equation.3  and  EMBED Equation.3  Problem 3 For the H2S removal case shown in Problem 1, indicate the magnitude if gas side resistance of the value of kg is 6x10-6 mole/m2 Pa s. Solution: Rearranging Eq.(6) we find  EMBED Equation.3  where  EMBED Equation.3  is partial pressure drop in the gas film. Using the same value of RA computed from Problem 1 as an approximation, we find  EMBED Equation.3  = 0.0016 / 6x10-6 = 266 Pa. The bulk gas partial pressure of H2S is 5000 Pa and the interfacial partial pressure is expected to be 4734 (5000-266). Hence the gas side resistance can be neglected for this problem. Instantaneous Reactions Instantaneous reactions can be analyzed directly as shown in this section. For the case of complete depletion ( approaches an asymptotic value of (1+q) which can be proved as follows. Assume now that the reaction takes place a reaction plane that separates A and B as shown in the following figure.   B0  A*  0 ( ( Equating the fluxes at the reaction plane  EMBED Equation.3  Eliminating ( we have ( = (  EMBED Equation.3   EMBED Equation.3  Problem 4: Reaction of H2S with amines can be treated as instantaneous as it is a proton transfer process. H2S + R2NH = HS- + R2NH2 + secondary amine Calculate the rate of absorption H2S if the gas is at 20 atm, contains 1% H2S while the amine solution contains 0.25 M amine. Diffusivity of H2S is 1.5 times the diffusivity of the amine, kLaB = 0.030 s-1. HA = 10-4 mol/cm3 atm Solution A* = (10-4) (20) (0.01) = 2 x 10-5 mol/cm3  EMBED Equation.3  R'A = 9.33 (0.030) (2 x 10-5) = 5.598 x 10-6  EMBED Equation.3  Note that the gas side mass transport resistance is neglected here which is not a realistic assumption for this case. Mixing cell model for gas-liquid reactions. A. Co-current flow case Gas phase balance QG (CA,k-1 CA,k) = agl Vcell (NA)z = 0 (1) where NA is the flux of gas A into the liquid at the gas-liquid interface (z=0) Liquid phase balance QL (CB,k-1 CB,k) = -agl Vcell (NB)z = ( (2) Where (NB)z = ( is the flux of B at the end of the film, z=( In Eq (2), we neglect reaction in the bulk liquid and assume that all the reaction is complete in the film itself. By stoichiometry  EMBED Equation.3  (3) since the amount of B diffusing into ( should balance the amount of A reacted in the film. Again note that there is no A diffusing into the bulk liquid for fast reactions. It is convenient to represent the model in terms of some basic dimensionless parameters. Let  EMBED Equation.3  and  EMBED Equation.3  for any cell represent the dimensionless concentration in the exit of that cell. (NA)z=0 for any cell can be expressed in terms of the enhancement factor, Ek for that cell NA = Ek kL Ag* where Ag* is the equilibrium gas concentration for the cell  EMBED Equation.3  Let  EMBED Equation.3  concentration based Henrys law constants Also define the following dimensionless group.  EMBED Equation.3  Eq (1) then reduces to  EMBED Equation.3  Combining Eq (2) and (1) using Eq (3) we obtain QL (CB,k-1 CB,k) = ( QG (CA,k-1 CA,k) which represents an overall mass balances for a given cell. Rearranging  EMBED Equation.3  Let  EMBED Equation.3  Then the above equation can be represented as  EMBED Equation.3  Finally the local enhancement factor E(k) needs to be calculated based on local values of the dimensionless groups needed in the film model E(k) = E ( Ha(k), q(k), BiG ) where  EMBED Equation.3   EMBED Equation.3  where Ha0 is based on inlet liquid concentration B.Counter-current flow The schematic of the k the cell is shown in the figure. The concentration entering a cell are denoted by the subscript, k-1 while those leaving the cell by subscript k The mass balance for each cell follows the similar line as for the co-current flow.  EMBED Equation.3   EMBED Equation.3  where E is now based on ag,k and bl,k values. It is easier to eliminate the commmon term  EMBED Equation.3  to get on expression for bl,k for each cell.  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