# Last edited on 2017-05-02 21:40:34 by jstolfi

Boiling point of NaOH + H2O solutions at 1 bar.

Source: 
  Australian Stainless Development Association (2014): 
  "[http://www.assda.asn.au/technical-info/technical-faqs/faq-9-welding-dissimilar-metals/266-general-corrosion-resistance General Corrosion Resistance]"
  Technical Article, accessed on 2017-05-01.
  
Measured in pixels on plot, converted to % and temperature.

  X !   Y !  %wt ! Tb(C)
----+-----+------+------
302 | 427 |  0.4 |  94.9
325 | 425 |  4.5 |  96.4
359 | 419 | 10.7 | 100.7
412 | 409 | 20.4 | 108.0
467 | 394 | 30.4 | 118.8
520 | 376 | 40.0 | 131.9
576 | 352 | 50.2 | 149.3
630 | 326 | 60.0 | 168.1
655 | 308 | 64.5 | 181.2
680 | 292 | 69.1 | 192.8
686 | 290 | 70.2 | 194.2
725 | 257 | 77.3 | 218.1
738 | 245 | 79.6 | 226.8
783 | 196 | 87.8 | 262.3
812 | 155 | 93.1 | 292.0
815 | 154 | 93.6 | 292.8
825 | 132 | 95.5 | 308.7
834 |  98 | 97.1 | 333.3


# Convert X,Y to %(wt) and T(C)
gawk '/^[ ]*[0-9]/{ X = $1; Y = $3; P = 20 + (X-410)*(80-20)/(740-410); T = 100 + (Y-420)*(300-100)/(144-420); $5 = sprintf(" %5.1f ", P); $7 = sprintf(" %5.1f ", T); print; next; } //{ print; next; }' | txtable-reformat

These numbers fit the formula 

  T(P) = 69 + 24.46*exp(0.02332*P)

almost perfectly between P = 5% and P = 80%.  But (like the plot) 
they give T(0) = 93.4 instead of 100.

Another source:
  Sandvik (2017): 
  "[http://smt.sandvik.com/en/materials-center/material-datasheets/tube-and-pipe-seamless/sandvik-2rk65/ Datasheet: SANDVIK 2RK65 Tube and Pipe, Seamless]". Accessed on 2017-05-01.

  X !   Y !  %wt ! Tb(C)
----+-----+------+------
572 | 314 |   .  | 100.0
619 | 308 | 10.3 | 103.1
663 | 298 | 19.9 | 108.2
710 | 282 | 30.1 | 116.4
754 | 262 | 39.7 | 126.7
800 | 231 | 49.8 | 142.6
847 | 192 | 60.0 | 162.6
882 | 158 | 67.7 | 180.0

# Convert X,Y to %(wt) and T(C)
gawk 'BEGIN { P0=0; X0=572; P1=100; X1=1030; T0=100; Y0=314; T1=180; Y1=158; } /^[ ]*[0-9]/{ X = $1; Y = $3; P = P0 + (X-X0)*(P1-P0)/(X1-X0); T = T0 + (Y-Y0)*(T1-T0)/(Y1-Y0); $5 = sprintf(" %5.1f ", P); $7 = sprintf(" %5.1f ", T); print; next; } //{ print; next; }' | txtable-reformat

----------------------------------------------------------------------
Source: Conde 
   M. Conde Engineering: 
   "Solid-Liquid Equilibrium (SLE) and Vapour-Liquid Equilibrium (VLE) of Aqueous NaOH". 
   
   
convert-conde-temps.gawk -v inField=3 -v outField=7 | txtable-reformat 


Boiling temperature at 100 kPa
    X !     Y ! %wt ! Tb(C)
------+-------+-----+------
459.0 | 414.3 |   0 | 100.0
459.0 | 402.0 |  10 | 105.1
459.0 | 386.0 |  20 | 112.0
459.0 | 361.0 |  30 | 123.5
459.0 | 324.0 |  40 | 142.1
459.0 | 302.0 |  45 | 154.1
459.0 | 279.0 |  50 | 167.3
459.0 | 235.0 |  60 | 195.1
459.0 | 182.0 |  70 | 232.9
459.0 | 150.0 |  75 | 258.5
459.0 | 118.0 |  80 | 286.6

# BP at 10 kPa

    X !     Y ! %wt ! Tb(C)
------+-------+-----+------
  537 |   564 |   0 |  45.8
  537 |   552 |  10 |  49.5
  537 |   530 |  20 |  56.5
  537 |   500 |  30 |  66.8
  537 |   454 |  40 |  83.8
  537 |   427 |  45 |  94.7
  537 |   398 |  50 | 106.8
  537 |   338 |  60 | 134.9
  537 |   269 |  70 | 173.4
  537 |   228 |  75 | 199.7
  537 |   181 |  80 | 233.6

# 
# BP at 1 kPa

    X !     Y ! %wt ! Tb(C)
------+-------+-----+------
  616 |   707 |   0 |   6.3
  616 |   694 |  10 |   9.7
  616 |   670 |  20 |  16.1
  616 |   634 |  30 |  25.6
  616 |   580 |  40 |  41.0
  616 |   546 |  45 |  51.3
  616 |   510 |  50 |  63.2
  616 |   439 |  60 |  89.7
  616 |   354 |  70 | 126.9
  616 |   302 |  75 | 154.1
  616 |   246 |  80 | 187.9
 ]
 
 {{tlx|val|20|u{{=}}degC}}
 
# Vapor pressure at 25 C
# 
# P X
# 0 578
# 10 585
# 20 597
# 30 618
# 40 652
# 45 676
# 50 706
# sat 718
# 
# Vapor pressure at 50 C 
# 
# P X
# 0 530
# 10 536
# 20 548
# 30 567
# 40 598
# 45 618
# 50 644
# sat 690

pressure X
100 459
10 537
1 616
0.1 694