﻿92 
  

  

  Mack 
  and 
  Hulett 
  — 
  Water 
  Content 
  of 
  Coal. 
  

  

  Table 
  I. 
  

  

  Powdered 
  coal 
  dried 
  in 
  vacuum 
  desiccator 
  over 
  phosphorus 
  

   pentoxide 
  with 
  percentage 
  loss 
  of 
  water 
  : 
  

  

  Weight 
  of 
  ) 
  

   each 
  v 
  

  

  New 
  

   Eiver 
  

  

  1-6623 
  

  

  Pitts- 
  

   burgh 
  

  

  1-613] 
  

  

  Illi- 
  

   nois 
  

  

  1-3704 
  

  

  Wyo- 
  

   ming 
  

  

  1-5853 
  

  

  Lignite 
  

   1-7465 
  

  

  Peat 
  

   1-2875 
  

  

  sample 
  ) 
  

  

  

  

  

  

  

  

  Time 
  : 
  

  

  

  

  

  

  

  

  1 
  hr. 
  

   3 
  hrs. 
  

   5 
  hrs. 
  

   2nd 
  day 
  

  

  1'26$ 
  

   1-52 
  

  

  1*75$ 
  

   1-29 
  

  

  6-40$ 
  

   7-66 
  

  

  9-17$ 
  

  

  40-09$ 
  

   40-76 
  

  

  45-98$ 
  

   55-80 
  

  

  3rd 
  " 
  

  

  1-63 
  

  

  1-48 
  

  

  7-86 
  

  

  12-63 
  

  

  41-01 
  

  

  55-96 
  

  

  4th 
  " 
  

  

  1-69 
  

  

  1-61 
  

  

  7-93 
  

  

  12-85 
  

  

  

  

  5th 
  " 
  

  

  

  

  7-97 
  

  

  12-92 
  

  

  41-20 
  

  

  56-15 
  

  

  6th 
  " 
  

  

  1-72 
  

  

  1-70 
  

  

  

  

  

  

  7th 
  " 
  

  

  1-74 
  

  

  1-76 
  

  

  8-03 
  

  

  12-93 
  

  

  

  56-16 
  

  

  8 
  th 
  " 
  

  

  1*74 
  

  

  1-78 
  

  

  8'04 
  

  

  

  

  

  9th 
  " 
  

  

  

  

  8-02 
  

  

  

  

  

  10th 
  « 
  

  

  

  

  

  12-92 
  

  

  41-32 
  

  

  56-18 
  

  

  13th 
  " 
  

  

  

  

  

  

  41-38 
  

  

  

  14th 
  " 
  

  

  

  

  

  

  41-39 
  

  

  

  On 
  heating 
  

  

  3 
  min 
  up 
  

  

  13 
  min 
  

  

  4 
  min 
  

  

  12 
  min 
  

  

  26 
  min 
  

  

  10 
  min 
  

  

  gradually 
  

   for 
  

  

  to 
  125° 
  

  

  up 
  to 
  

  

  230° 
  

  

  up 
  to 
  

   115° 
  

  

  up 
  to 
  

  

  170° 
  

  

  up 
  to 
  

  

  190° 
  

  

  up 
  to 
  

   115° 
  

  

  

  2-13$ 
  

  

  2*10$ 
  

  

  8*58$ 
  

  

  15 
  more 
  

   min 
  up 
  

  

  to 
  205° 
  

  

  10-29$ 
  

  

  13-20$ 
  

  

  11 
  more 
  

   min 
  up 
  

  

  to 
  200° 
  

  

  13-36$ 
  

  

  42-91$ 
  

  

  56-63$ 
  

  

  11 
  more 
  

   min 
  up 
  

  

  to 
  170° 
  

  

  56-91$ 
  

  

  Note 
  — 
  Weighings 
  on 
  successive 
  days 
  were 
  made 
  only 
  roughly 
  at 
  24 
  hour 
  

   intervals. 
  

  

  limits 
  of 
  0*09 
  per 
  cent, 
  for 
  New 
  River 
  and 
  0'61 
  per 
  cent, 
  for 
  

   lignite. 
  

  

  It 
  has 
  been 
  shown* 
  that 
  there 
  is 
  not 
  a 
  measurable 
  decompo- 
  

   sition 
  of 
  these 
  kinds 
  of 
  coals 
  when 
  heated 
  in 
  a 
  vacuum 
  to 
  250° 
  

   for 
  several 
  hours 
  — 
  a 
  point 
  we 
  will 
  consider 
  more 
  in 
  detail 
  

   below. 
  Since 
  none 
  of 
  the 
  additional 
  water 
  expelled 
  by 
  heat- 
  

   ing 
  above 
  room 
  temperature 
  could 
  come 
  from 
  a 
  synthesis 
  of 
  

   water 
  from 
  oxygen 
  and 
  hydrogen, 
  and 
  since 
  it 
  did 
  not 
  behave 
  

   like 
  combined 
  water 
  or 
  water 
  of 
  crystallization 
  but 
  showed 
  a 
  

   typical 
  solution 
  or 
  adsorption 
  curve,f 
  the 
  water 
  must, 
  there- 
  

  

  * 
  H. 
  C. 
  Porter 
  and 
  G. 
  B. 
  Taylor, 
  The 
  mode 
  of 
  Decomposition 
  of 
  Coal 
  by 
  

   Heat, 
  Proc. 
  Amer. 
  Gas. 
  Inst., 
  vol. 
  ix, 
  234, 
  1914. 
  

   f 
  Porter 
  and 
  Ralston. 
  

  

  