Vapor Pressure of Methanol

The German Lurgi Company and Linde A. G. developed the Rectisol process to use methanol to sweeten natural gas. Due to the high vapor pressure of methanol this process is usually operated at temperatures of -30 to -100°F. It has been applied to the purification of gas 1 plants and in coal gasification plants, but is not used commonlv natural gas streams. 

Self-Test 8.3B The vapor pressure of methanol, CH3OH, at 49.9°C is 400. Torr, and its enthalpy of vaporization is 35.3 kj-mol-1. Estimate the normal boiling point of methanol. 

Use data from Table 6.3 to calculate the vapor pressure of methanol at 25.0°C. 

Table 4 Data and Results of Fit for Uni-univalent Electrolyte Effect on the Vapor Pressure of Methanol at 298.05°K... 

Figure 5. Salt effect on the vapor pressure of methanol at 298.05 K (experimental data (25) ( ) NaOH-methanol ( ) Nal-methanol)...

Experimental runs were made at relative pressures between 0.1 and 0.85 at temperatures of 45° and 35°C. The vapor pressures of methanol were obtained by plotting the data of Stull (13) and reading the 35°C. and 45°C. values (201 and 320 mm., respectively). 

The fundamental data obtained by this procedure were weights of dry coals, amounts of acetylation, spring elongations vs. time, equilibrium spring elongations, and pressures of methanol. These data in conjunction with the spring constants and vapor pressures of methanol allowed for calculating the kinetics and isotherms of the sorption of methanol. 

Using the Equilibrium Vapor Pressure activity (eChapter 10.5), compare the vapor pressures of methanol, ethanol, acetic acid, water, and benzene. 

M85 or E85 created using this gasoline will probably be between 62 kPa (9 psi) and 69 kPa (10 psi). To compensate, the gasoline used to produce M85 or E85 will contain additional butane and/or pentanes to counteract the damping effect of the low vapor pressure of methanol and ethanol. 

C, the vapor pressure of methanol is 94 torr and that of ethanol is 44 torr. (a) Determine the partial pressure exerted by each component in a solution containing 20 g CH3OH and 100 g C2H5OH. (b) What are the mole... 

A benzene-methanol solution with Xch3oh = 0.5191 and ya i()( = 0.5571 has atotal vapor pressure of 292.5 torr. The vapor pressure of methanol is 150 torr and that of benzene is 210 torr at the temperature of the solution. Calculate the Raoult s law reference activity coefficients for benzene and methanol in this solution. 

Reported vapor pressures of methanol at various temperatures and the coefficients for the vapor pressure equations... 

A solution composed of ethanol and methanol can be thought of as ideal. At room temperature, the vapor pressure of ethanol is 45 rrunHg and the vapor pressure of methanol is 95 mmHg. Which of the following will be true regarding the vapor pressure of a solution containing only ethanol and methanol ... 

The vapor pressure of methanol in millimeters of mercury is given by the Antoine equation as... 

Step 2 The vapor pressure of methanol is calculated from the Antoine equation given above as... 

Fig. 1.5 Vapor pressure of methanol and water for methanol-water solutions plotted against the mole fraction of methanol at 40° C. The left-hand ordinate scale gives the vapor pressure of water and the right-hand scale that of methanol. 

The above approximate guideline for an ideally dilute solution can only be made more exact by examining vapor pressure data for a specific system. The case of the methanol-water system discussed earlier is used as an illustration. For very dilute solutions, that is, when VMeOH is less than 0.04, the vapor pressure of methanol is linear in its mole fraction. This is the region where Henry s law is obeyed. As the mole fraction increases, the actual vapor pressure falls below that predicted by Henry s law, quite significant deviations being found when Xmeoh reaches 0.1. Henry s law for component B in a two-component system of A and B may be expressed as... 

Fig. 1.12 Vapor pressure of methanol for dilute solutions of methanol in water plotted against the mole fraction of methanol. The straight line shows the vapor pressure according to Henry s law, and the broken line, that according to Raoult s law.

The vapor pressure of ethanol (C2H5OH) at 20°C is 44 mmHg, and the vapor pressure of methanol (CH3OH) at the same temperature is 94 mmHg. A mixture of 30.0 g of methanol and 45.0 g of ethanol is prepared (and can be assumed to behave as an ideal solution), (a) Calculate the vapor pressure of methanol and ethanol above this solution at 20°C. (b) Calculate the mole fraction of methanol and ethanol in the vapor above this solution at 20°C. 

At r = 60°C the vapor pressure of methyl acetate is 1.1-26 bar, and the vapor pressure of methanol is 0.847 bar. Their mixtures can be described by the one-constant Marguies equation... 

Fig. 2.1-10 Vapor pressure of methanol as well as of sodium methylate-methanol solutions...

The boiling point of methanol is 65.0°C and the standard enthalpy of formation of methanol vapor is — 201.2 kJ/mol. Calculate the vapor pressure of methanol (in mmHg) at 25°C. Hint See Appendix 3 for other thermodynamic data of methanol.)... 

The vapor pressure of ethanol (C2H5OH) at 20°C is IS 44 mmHg, and the vapor pressure of methanol... 

---