Enthalpy Pressure Diagram

This web page allows one to select a pure component or a mixture of components and produce a graph of enthalpy vs. pressure with lines of constant temperature. There is also a line for the phase envelope. This page uses the Peng-Robinson equation of state to predict the properties of these mixtures. The calculations are much faster and sometimes more accurate for a pure components than for mixtures.

These calculations are made using the most recent experimental version of the thermodynamics library that is included in the CANARY by Quest Consequence Modeling Software available from Quest Consultants Inc. The results should be considered a demonstration only and not used for design purposes.

All of these calculations use the Peng/Robinson equation of state. The calculations are based on predictions of vapor/liquid equilibrium. If the vapor/liquid equilibrium cannot exist for the mixture, temperature, and pressure that you select, then the answers may not be good. If components freeze or if components separate into more than one liquid phase or if polar chemicals are mixed with water, the answers are not likely to be good. The answers are usually excellent at high temperatures and low pressures.

To try it out, create an input mixture using the form below and hit the submit form button to start the calculations. Depending on the mixture selected and the load on the www.questconsult.com server, this calculation can take several minutes. Please be patient.

Mixture

Select the components for your mixture from the list below and enter the integer identifier and enter the mole fraction of each component. If the mole fractions do not sum to one when you are done, they will be re-normalized for you so long as they are all greater than zero. If a component identifier is entered, then the corresponding mole fraction must also be entered.

Component id 01: Mole fraction in mixture:
Component id 02: Mole fraction in mixture:
Component id 03: Mole fraction in mixture:
Component id 04: Mole fraction in mixture:
Component id 05: Mole fraction in mixture:
Component id 06: Mole fraction in mixture:
Component id 07: Mole fraction in mixture:
Component id 08: Mole fraction in mixture:
Component id 09: Mole fraction in mixture:
Component id 10: Mole fraction in mixture:


Component list

   1 = Methane, CH4
   2 = Ethane, C2H6
   3 = Propane, C3H8
   4 = Isobutane, C4H10
   5 = n-Butane, C4H10
   6 = Isopentane, C5H12
   7 = n-Pentane, C5H12
   8 = n-Hexane, C6H14
   9 = n-Heptane, C7H16
  10 = n-Octane, C8H18
  11 = n-Nonane, C9H20
  12 = n-Decane, C10H22
  13 = n-Undecane, C11H24
  14 = Ethylene, C2H4
  15 = Propylene, C3H6
  16 = Nitrogen, N2
  17 = Carbon Dioxide, CO2
  18 = Hydrogen Sulfide, H2S
  19 = PHC-200, C15H24 
  20 = PHC-300, C22H38
  21 = PHC-400, C28H42
  22 = PHC-500, C38H61
  23 = PHC-600, C44H70
  24 = PHC-700, C51H82
  26 = Hydrogen Chloride, HCl
  27 = Chlorine, Cl2
  28 = Oxygen, O2
  31 = Dodecane, C12H26
  32 = Tridecane, C13H28
  33 = Tetradecane, C14H30
  34 = Pentadecane, C15H32
  36 = n-Heptadecane, C17H36 
  40 = Methyl Mercaptan, CH4S
  41 = Ethyl Mercaptan, C2H6S
  42 = Methyl Amine, CH5N (mono)
  43 = Carbon Monoxide, CO
  44 = Sulfur Dioxide, O2S
  46 = Sulfur Trioxide, O3S
  47 = Sulfuric Acid, H2SO4
  50 = Hydrogen Fluoride, HF
  51 = Hydrogen(equilibrium), H2
  52 = Water, H2O
  53 = Ammonia, H3N
  55 = Helium, He 
  56 = Neon, Ne 
  57 = Argon, Ar 
  58 = Krypton, Kr 
  59 = Xenon, Xe 
  60 = Difluoromethane, CH2F2 
  61 = Dichloromethane, CH2Cl2 
  62 = Chlorodifluoromethane, CHClF2
  63 = Dichloromonofluoromethane, CHCl2F 
  64 = Dichlorodifluoromethane, CCl2F2
  65 = Trichlorofluoromethane, CCl3F
  66 = 1,1-Difluoroethane, C2H4F2
  67 = 1,1-Dichloroethane, C2H4Cl2 
  68 = 1,2-Dichloroethane, C2H4Cl2
  69 = Trichloroethylene, C2HCl3 
  70 = Tetrafluoroethylene, C2F4
  71 = Perfluoroethane, C2F6 
  72 = Chlorodifluoroethane, C2H3ClF2 
  73 = 1,1-Dichlorotetrafluoroethane, C2Cl2F4 
  74 = 1,2,2-Trichlorotrifluoroethane, C2Cl3F3 
  75 = 1,2 Dichloropropane, C3H6Cl2 
  76 = Tetrachloroethylene, C2Cl4 
  80 = Fluorine, F2
  81 = Bromine, Br2
  82 = Ozone, O3
  83 = Boron Trifluoride, BF3
  84 = Boron Trichloride, BCl3
  85 = Carbon Disulfide, CS2
  86 = Hydrazine, H4N2
  87 = Nitric Oxide, NO
  88 = Nitrous Oxide, N2O
  89 = Nitrogen Dioxide, NO2
  90 = Nitric Acid, HNO3
  91 = Nitrogen Trifluoride, F3N
  92 = Hydrogen Bromide, HBr
  94 = Titanium Tetrachloride, TiCl4
 100 = Carbon Oxysulfide, COS
 101 = Carbon Tetrafluoride, CF4 
 102 = Carbon Tetrachloride, CCl4
 103 = Hydrogen Cyanide, CHN
 104 = Fluoroform, CHF3 
 105 = Chloroform, CHCl3
 106 = Phosgene, CCl2O
 107 = Formaldehyde, CH2O
 108 = Methyl Fluoride, CH3F 
 109 = Methyl Chloride, CH3Cl
 110 = Methyl Bromide, CH3Br
 111 = Methyl Iodide, CH3I
 112 = Nitromethane, CH3NO2
 113 = Methanol, CH4O
 114 = Methyl Hydrazine, CH6N2
 120 = Cyanogen, C2N2
 121 = Trifluoroacetonitrile, C2F3N 
 122 = Acetylene, C2H2
 123 = Ketene, C2H2O
 124 = Vinylidene Fluoride, C2H2F2
 125 = Vinyl Fluoride, C2H3F
 126 = Acetonitrile, C2H3N 
 127 = Methyl Isocyanate, C2H3NO
 128 = Vinyl Chloride, C2H3Cl
 129 = Acetyl Chloride, C2H3ClO 
 130 = Acetaldehyde, C2H4O
 131 = Ethylene Oxide, C2H4O
 132 = Acetic Acid, C2H4O2
 133 = Methyl Formate, C2H4O2
 134 = Ethyl Bromide, C2H5Br
 135 = Ethyl Chloride, C2H5Cl
 136 = Ethyl Fluoride, C2H5F
 137 = Dimethyl Ether, C2H6O
 138 = Ethanol, C2H6O
 139 = Methyl Ether, C2H6O
 140 = Dimethyl Sulfide, C2H6S
 141 = Dimethylamine, C2H7N
 142 = Ethyl Amine, C2H7N
 143 = Ethylenediamine, C2H8N2
 150 = Acrylonitrile, C3H3N
 151 = Propyne, C3H4
 152 = Propadiene, C3H4
 153 = Acrolein,  C3H4O
 154 = Acrylic Acid, C3H4O2 
 155 = Vinyl Formate, C3H4O2 
 156 = Propionitrile, C3H5N
 157 = Allyl Chloride, C3H5Cl
 158 = 1,2,3-Trichloropropane, C3H5Cl3 
 159 = Epichlorohydrin, C3H5ClO
 160 = Cyclopropane, C3H6
 161 = Acetone, C3H6O
 162 = Propylene Oxide, C3H6O
 163 = Allyl Alcohol, C3H6O
 164 = Vinyl Methyl Ether, C3H6O
 165 = Ethyl Formate, C3H6O2 
 166 = Methyl Acetate, C3H6O2 
 167 = Propionic Acid, C3H6O2 
 168 = Propyl Chloride, C3H7Cl 
 169 = Isopropyl Chloride, C3H7Cl
 170 = 1-Propanol, C3H8O
 171 = Isopropyl Alcohol, C3H8O 
 172 = Methyl Ethyl Ether, C3H8O 
 173 = Isopropyl Amine, C3H9N
 174 = n-Propyl Amine, C3H9N 
 175 = Trimethyl Amine, C3H9N
 180 = Vinyl Acetylene, C4H4
 181 = Furan, C4H4O
 182 = Thiophene, C4H4S 
 183 = Allyl Cyanide, C4H5N 
 184 = Ethyl Acetylene (1-Butyne), C4H6
 185 = 2-Butyne, C4H6 
 186 = 1,2-Butadiene, C4H6 
 187 = 1,3 Butadiene, C4H6 
 188 = trans-Crotonaldehyde, C4H6O
 189 = Vinyl Acetate Monomer, C4H6O2
 190 = Methyl Acrylate, C4H6O2 
 191 = 1-Butene, C4H8
 192 = trans-2-Butene, C4H8
 193 = cis-2-Butene, C4H8
 194 = Cyclobutane, C4H8 
 195 = Isobutylene, C4H8
 196 = Isobutyraldehyde, C4H8O 
 197 = Methyl Ethyl Ketone, C4H8O 
 198 = Tetrahydrofuran, C4H8O 
 199 = Vinyl Ethyl Ether, C4H8O
 200 = 1,4-Dioxane, C4H8O2 
 201 = n-Butyric Acid, C4H8O2 
 202 = Isobutyric Acid, C4H8O2 
 203 = Methyl Propionate, C4H8O2 
 204 = Ethyl Acetate, C4H8O2 
 205 = Sulfolane, C4H8O2S
 206 = 1-Chlorobutane, C4H9Cl 
 207 = 2-Chlorobutane, C4H9Cl 
 208 = tert-Butyl Chloride, C4H9Cl 
 209 = Pyrrolidine, C4H9N 
 210 = Morpholine, C4H9NO 
 211 = 2-Butanol, C4H10O 
 212 = n-Butanol, C4H10O  
 213 = Isobutanol, C4H10O 
 214 = tert-Butanol, C4H10O 
 216 = Diethyl Ether, C4H10O
 217 = 1,2-Dimethoxyethane, C4H10O2 
 218 = Diethyl Sulfide, C4H10S 
 219 = Diethyl Amine, C4H11N
 230 = Pyridine, C5H5N 
 231 = 1,2-Pentadiene, C5H8 
 232 = 1,3-Pentadiene, C5H8
 233 = trans-1,3-Pentadiene, C5H8 
 234 = 1,4-Pentadiene, C5H8 
 235 = 2-Methyl-1,3-Butadiene, C5H8 
 236 = 3-Methyl-1,2-Butadiene, C5H8 
 237 = Isoprene, C5H8
 238 = 1-Pentyne, C5H8 
 239 = Cyclopentanone, C5H8O 
 240 = Ethyl Acrylate, C5H8O2 
 241 = 1-Pentene, C5H10
 242 = cis-2-Pentene, C5H10
 243 = trans-2-Pentene, C5H10
 244 = Cyclopentane, C5H10
 245 = 3-Methyl-1-Butene, C5H10
 246 = 2-Methyl-1-Butene, C5H10
 247 = Diethyl Ketone, C5H10O 
 248 = Methyl Isopropyl Ketone, C5H10O 
 249 = Methyl n-Propyl Ketone, C5H10O 
 250 = Ethyl Propionate, C5H10O2 
 251 = Isobutyl Formate, C5H10O2 
 252 = n-Propyl Acetate, C5H10O2 
 253 = Piperidine, C5H11N
 254 = 2,2-Dimethylpropane (Neopentane), C5H12
 255 = MTBE,C5H12O
 261 = o-Dichlorobenzene, C6H4Cl2 
 262 = Fluorobenzene, C6H5F 
 263 = Chlorobenzene, C6H5Cl
 264 = Bromobenzene, C6H5Br 
 265 = Iodobenzene, C6H5I 
 266 = Benzene, C6H6
 267 = Phenol, C6H6O
 268 = Aniline, C6H7N 
 269 = 4-Methylpyridine, C6H7N 
 270 = 1-Hexene, C6H12 
 271 = 2,3-Dimethyl-1-Butene, C6H12 
 272 = Cyclohexane, C6H12
 273 = Methylcyclopentane, C6H12 
 274 = trans-2-Hexene, C6H12 
 275 = trans-3-Hexene, C6H12 
 276 = Diisopropyl Ether, C6H14O 
 277 = Ethyl Butyl Ether, C6H14O 
 278 = 2-Methyl-2-Pentene, C6H12 
 281 = Toluene, C7H8
 282 = Styrene Monomer, C8H8
 283 = Ethylbenzene, C8H10
 284 = Xylene, ortho  C8H10
 285 = Xylene, meta  C8H10
 286 = Xylene, para  C8H10
 287 = 1-Octene, C8H16 
 288 = 2,2,3-Trimethylpentane, C8H18 
 289 = 3-Methylheptane, C8H18 
 290 = 1-Octanol, C8H18O 
 291 = Naphthalene, C10H8 
 292 = 1-Decene, C10H20
 293 = 1-Methylnaphthalene, C11H10 
 294 = 2-Methylnaphthalene, C11H10 

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