dimethylether !short name 115-10-6 !CAS number methoxymethane !full name (CH3)2O !chemical formula {C2H6O} RE-170 !synonym 46.06844 !molecular weight [g/mol] 131.65 !triple point temperature [K] 248.34 !normal boiling point [K] 400.3 !critical temperature [K] 5340.5 !critical pressure [kPa] 6.013 !critical density [mol/L] 0.197 !acentric factor 1.301 !dipole moment [Debye]; Nelson, R.D., Lide, D.R., Maryott, A., NSRDS 10, NBS (1967) NBP !default reference state 8.0 !version number 1033 !UN Number ! compiled by Mark McLinden, NIST Physical and Chemical Properties Division, Boulder, Colorado ! 07-16-98 MM, original version ! 05-12-05 MLH, added transport ! 05-10-06 EWL, add new Helmholtz eos ! 04-12-07 EWL, changed full name from ethylene oxide to methoxymethane #EOS !equation of state specification FEQ Helmholtz equation of state for DME of Ihmels and Lemmon (2007). ?LITERATURE REFERENCE \ ?Ihmels, E.C. and Lemmon, E.W. ?"Experimental Densities, Vapor Pressures, and Critical Point, and a ? Fundamental Equation of State for Dimethyl Ether," ? Fluid Phase Equilibria, 260:36-48, 2007. ?\ ?The uncertainty in density of the equation of state ranges from 0.1% in the ?liquid to 1% near the critical point. The uncertainty in heat capacities is ?2%, and the uncertainty in vapor pressure is 0.25% at temperatures above 200 ?K. The uncertainty in vapor pressure increases at lower temperatures due to ?the lack of experimental data. In the critical region, the uncertainties ?are higher for all properties except vapor pressure. ?\ !end of info section 131.65 !lower temperature limit [K] 525.0 !upper temperature limit [K] 40000.0 !upper pressure limit [kPa] 19.15 !maximum density [mol/L] CPP !pointer to Cp0 model 46.06844 !molecular weight [g/mol] 131.65 !triple point temperature [K] 0.0023 !pressure at triple point [kPa] 19.15 !density at triple point [mol/L] 248.34 !normal boiling point temperature [K] 0.197 !acentric factor 400.3 5340.5 6.013 !Tc [K], pc [kPa], rhoc [mol/L] 400.3 6.013 !reducing parameters [K, mol/L] 8.314472 !gas constant [J/mol-K] 10 4 0 12 0 0 !# terms, # coeff/term for: "normal" terms, critical, spare 1.22690 0.21 1. 0 !a(i),t(i),d(i),l(i) -2.47245 1.0 1. 0 0.119889 0.5 3. 0 0.0000354 1.0 8. 0 0.567139 1.4 2. 1 0.166649 3.1 1. 1 -0.078412 1.5 5. 1 -0.289066 5.0 1. 2 -0.031272 5.9 4. 2 -0.065607 3.7 3. 2 #AUX !auxiliary model specification CPP ideal gas heat capacity function ?LITERATURE REFERENCE \ ?Ihmels, E.C. and Lemmon, E.W. ?see EOS ?\ !end of info section 50.0 !lower temperature limit [K] 3000.0 !upper temperature limit [K] 0.0 !upper pressure limit [kPa] 0.0 !maximum density [mol/L] 1.0 8.314472 !reducing parameters for T, Cp0 1 4 0 0 0 0 0 !Nterms: polynomial, exponential, cosh, sinh 4.039 0.0 2.641 361.0 2.123 974.0 8.992 1916.0 6.191 4150.0 #AUX !auxiliary model specification PH0 Helmholtz form for the ideal-gas state ?LITERATURE REFERENCE \ ?Lemmon, E.W. ?\ !end of info section 50.0 !lower temperature limit [K] 1500.0 !upper temperature limit [K] 0.0 !upper pressure limit [kPa] 0.0 !maximum density [mol/L] 1 2 4 0 0 0 0 0 !Nterms: ai*log(tau**ti); ai*tau**ti; ai*log(1-exp(bi*tau)) 3.039 1.0 !ai, ti for [ai*log(tau**ti)] terms -1.928925 0.0 !aj, ti for [ai*tau**ti] terms 3.150284 1.0 2.641 -0.9018236323 !aj, ti for [ai*log(1-exp(ti*tau)] terms 2.123 -2.4331751187 8.992 -4.7864101924 6.191 -10.3672245816 #TRN !transport model specification ECS Extended Corresponding States model (Propane reference); fitted to data. ?LITERATURE REFERENCES \ ? ? *** ESTIMATION METHOD--- NOT STANDARD REFERENCE QUALITY--- ? ? Uses method described in the following reference: ? Huber, M.L., Laesecke, A., and Perkins, R.A., ? "Model for the Viscosity and Thermal Conductivity of Refrigerants, ? Including a New Correlation for the Viscosity of R134a", ? Ind. Eng. Chem. Res., 42:3163-3178, 2003. ? ? Reference for experimental data for viscosity ? Wu, J., Liu, Z., Bi, S. and Meng, X., "Viscosity of saturated liquid dimethyl ether ? from (227 to 343 )K", J. Chem. Eng. Data 48, 426-429. ? ? Reference for experimental data for thermal conductivity ? Wu, J., Liu, Z., Jin, X. and Pan, J., "Thermal conductivity of some oxygenated fuels ? and additives in the saturated liquid phase". J. Chem. Eng. Data 50, 102-104. ? ?Average absolute deviations of the fit from the experimental data were:\ ? Viscosity: 0.7%; Thermal conductivity: 0.2% ? ?The Lennard-Jones parameters are from: ?Reid, R.C., Prausnitz, J.M., and Poling, B.E., ? "The Properties of Gases and Liquids," ? 4th edition, New York, McGraw-Hill Book Company, 1987. ?\ !end of info section 131.65 !lower temperature limit [K] 450.0 !upper temperature limit [K] 20000.0 !upper pressure limit [kPa] 19.24 !maximum density [mol/L] FEQ propane.fld VS1 !model for reference fluid viscosity TC1 !model for reference fluid thermal conductivity 1 !Lennard-Jones flag (0 or 1) (0 => use estimates) 0.4307 !Lennard-Jones coefficient sigma [nm] 395.0 !Lennard-Jones coefficient epsilon/kappa [K] for ECS method 1 0 0 !number of terms in f_int term in Eucken correlation, spare1, spare2 1.32d-3 0.0 0.0 0.0 !coeff, power of T, spare 1, spare 2 3 0 0 !number of terms in psi (visc shape factor): poly,spare1,spare2 1.81678 0.0 0.0 0.0 !coeff, power of Tr, power of Dr, spare -0.696062 0.0 1.0 0.0 !coeff, power of Tr, power of Dr, spare 0.13901 0.0 2.0 0.0 !coeff, power of Tr, power of Dr, spare 2 0 0 !number of terms in chi (t.c. shape factor): poly,spare1,spare2 1.27047 0.0 0.0 0.0 !coeff, power of Tr, power of Dr, spare -8.49955d-2 0.0 1.0 0.0 !coeff, power of Tr, power of Dr, spare TK6 !pointer to critical enhancement auxiliary function #AUX !thermal conductivity critical enhancement model TK6 simplified thermal conductivity critical enhancement of Olchowy and Sengers ?LITERATURE REFERENCE \ ?Olchowy, G.A. and Sengers, J.V., ? "A simplified representation for the thermal conductivity of fluids in the ? critical region," ? Int. J. Thermophysics, 10:417-426, 1989. ?\ ?as applied to CO2 by: ?\ ?Vesovic, V., Wakeham, W.A., Olchowy, G.A., Sengers, J.V., Watson, J.T.R. ? and Millat, J., ? "The transport properties of carbon dioxide," ? J. Phys. Chem. Ref. Data, 19:763-808, 1990. ?\ !end of info section 131.65 !lower temperature limit [K] 450.0 !upper temperature limit [K] 20000.0 !upper pressure limit [kPa] 17.24 !maximum density [mol/L] 9 0 0 0 !# terms: CO2-terms, spare, spare, spare 1.0 1.0 1.0 !reducing par for T, rho, tcx (mW/m-K) 0.630d0 !gnu (universal exponent) 1.239d0 !gamma (universal exponent) 1.03d0 !R0 (universal amplitude) 0.063d0 !z (universal exponent--not used for t.c., only viscosity) 1.00d0 !c (constant in viscosity eqn = 1/[2 - (alpha + gamma)/(2*nu)], but often set to 1) 0.194d-9 !xi0 (amplitude) [m] 0.0496 !gam0 (amplitude) [-] 0.5d-09 !qd_inverse (modified effective cutoff parameter) [m] generic number 600.15d+00 !tref (reference temperature)=1.5*Tc [K] #STN !surface tension specification ST1 surface tension model of Soares et al. (1986). ?LITERATURE REFERENCE \ ?Soares, V.A.M., Almeida, B.J.V.S., McLure, I.A. and Higgins, R.A. (1986). ? Surface tension of pure and mixed simple substances at low temperature. Fluid ? Phase Equilibria 32: 9-16.\ ?\ !end of info section 131.65 !lower temperature limit [K] 400.10 !upper temperature limit [K] 0.00 !(dummy) upper pressure limit 0.00 !(dummy) maximum density 1 !number of terms in surface tension model 400.10d0 !critical temperature used in fit (dummy) 0.061023d0 1.26d0 !sigma0 and n #PS !vapor pressure equation PS5 vapor pressure equation ?LITERATURE REFERENCE \ ?Ihmels, E.C. and Lemmon, E.W. ? see EOS for reference. ?\ !end of info section 131.65 !lower temperature limit [K] 400.3 !upper temperature limit [K] 0.0 !(dummy) upper pressure limit 0.0 !(dummy) maximum density 400.3 5340.5 !reducing parameters 4 0 0 0 0 0 !number of terms in equation -7.19 1.0 !coefficients and exponents 2.148 1.5 -2.452 2.5 -1.906 5.0 @END c 1 2 3 4 5 6 7 8 c2345678901234567890123456789012345678901234567890123456789012345678901234567890 @EOS !equation of state specification ECS Thermodynamic Extended Corresponding States model w/ T- and rho-dependent shape factors. ?LITERATURE REFERENCE \ ?Huber, M.L. and Ely, J.F., ? "A predictive extended corresponding states model for pure and mixed ? refrigerants including an equation of state for R134a," ? Int. J. Refrigeration, 17:18-31, 1994.\ ?\ ?ECS parameters fitted by M.L. Huber, NIST, 12-06-95\ ? Fixed points Tc, Pc, rhoc, Tt are recommended values from DIPPR DIADEM 2004, v2.7.0 ? Estimated uncertainty of <1% for Tc, <3% for Pc, <5% for rhoc, and <1 % for Tt. ? Liquid densities and vapor pressures based on fits to DIPPR recommended values. ? Estimated uncertainty on liquid density is <3%, and < 5% for vapor pressure in ? the range 200-400.1 K ?\ !end of info section 131.65 !lower temperature limit [K] 450.0 !upper temperature limit [K] 20000.0 !upper pressure limit [kPa] 19.24 !maximum density [mol/L] CP1 !pointer to Cp0 model r134a.fld BWR !pointer to reference fluid model 0.32668 !acentric factor for R134a used in shape factor correlation 0.259147 !critical compressibility for R134a used in correlation 0.200698 !acentric factor for fluid used in shape factor correlation 400.1 !critical temperature [K] 5370.2 !critical pressure [kPa] 5.882353 !critical density [mol/L] (0.17 L/mol used in Huber & Ely) 2 !number of temperature coefficients for 'f' shape factor 0.67957012d-1 0.0d0 !alpha1 of Huber & Ely -0.61607777d+0 1.0d0 !alpha2 of Huber & Ely (log(Tr) term) 0 !number of density coefficients for 'f' shape factor 2 !number of temperature coefficients for 'h' shape factor -0.44475802d+0 0.0d0 !beta1 of Huber & Ely 0.71371769d-1 1.0d0 !beta2 of Huber & Ely (log(Tr) term) 0 !number of density coefficients for 'h' shape factor #AUX !auxiliary model specification CP1 ideal gas heat capacity function ?LITERATURE REFERENCE \ ?Chao, J. and Hall, K.R. (1982). Perfect gas thermodynamic properties of ? dimethl (sic), ethyl, methyl, and diethyl ethers. ? 8th Symposium on Thermophysical Properties, ASME, 1: 71-77. ?\ !end of info section 150.0 !lower temperature limit [K] 450.0 !upper temperature limit [K] 0.0 !upper pressure limit [kPa] 0.0 !maximum density [mol/L] 1.0 1.0 !reducing parameters for T, Cp0 3 0 0 0 0 0 0 !Nterms: polynomial, exponential, cosh, sinh 0.34954179d+02 0.00 !c(i), power of T 0.78858254d-01 1.00 0.83028740d-04 2.00