New-York tribune., 1909-03-07

and hemock is reduced to small chips which are
aferward passed through reyogtng vi , or 59 sn4 ANA
the pieces that are too large 10 oe paCPf5 ~ be-
cut M finer and rescreened. These chips. averSS-
ing threeeighths to one-half inch are an&TE OIL one Ne
half the size of those used Tor SuIph4tt- 11r1r
sCriptlOn here given is quoted from an eTCel.T't
one furnished the special commute ot , Li.6
about seven feet in diameter and twenty NM r.
NeIy Llpo ,dIle 90 The cbins arc run into
about fOrtv-twO hundred gallons OF II or Ilt2
degrees caustic soda, Baume test at so degrees
cured and steam is turned on. The caGstc soda
is circulated by steam tnjectors and the steam
is run up to 125 or I3o pounds The wood is cooked
six to eight hours. according TO- us dTNL,- dlN~ l:
caUstic soda The latter enters the chips at thclt
moisture the pressure OF the moisture Trtafd- l'iz
absorption Of the liquor and The cooking process Is
ION uI me t pr & = Iie 2 % yy-e[ -ba cooking is
opened ana the contents are discharged tuHder
pressure1 into a suspended receiving tank: The
tank ana the pulp and liquor fan 20 the bottom
When the digester is discharged the valve is closed
tents Of the digester, which are then N the 2lo"
equipped with perforated bottom through Wulcn
the liquor drains rom me pup & w w ana ana rarIat.s r'
is sprayed on at the top OF NE IAN, III. an" rsok
down through the pulp. FOLLOWING tHl7 MEtT MElIT
the intercelluIar matter-which is in solution
drains away from the pulp. e.[yl"s @ @ Yin inc
cellular matter). which d.. drained from the wash
pans. is pumped multiple effect eNaporatHI.
where il is boiled down from an averaSe 81 5'@
degrees Baume at 50 degrees f. I" - 70 40 ur-
grees the same temperature, and is, when
boiled down the consistency OF hot pIfCH IL IS
then pumped into revolving furnaces gt y 10 =
feet diameter and r. "a feet in length lined WITH
brick. These furnaces revolye slowly. iHf tucSS
tarry liquor Smears over their inner surfaces ana
is fired fv heat generated IU Hr-b"E located ar
end and thus tn. iutercellulaT matter ~ pLrne
or charred ! large part Of It, to an ASH but II IS
only necessarily to thoroughly char the interce-
Iular uatte4 % make it ius0lubi" iU water What
caustcitv remains i'm this liquor by the time II
reaches this process disappears through the car
bombing effect Df combustion, and the resultant
ash discharged bv this rotary consists o charcoal
and carbonate of soda. This "hack ash IS then
conveyed bleaching tanks and put through 2
diffusion system-L o. series OF tanks are flLe4i
with black ash and hot water IS then circulated
ft,m to another. The soda ash being soluole
is p, moved from the charcoal and passes out as =
clear liquid. Hot water is again INTRODUCED 50
as 10 thoroughly wash out all traces OF soda from
the charcoal The liquid is Fheu pumped 70 TANKS
where il is caJstt.iSed with freshly burned CfuSuc
lirne-it takes ffty pounds Of lime to CauStlciSe
one hundred pounds Of soda The liquor Is made
a bout qs pe- cent CaIstlC BY this process "Il-h
is known ms ''the recovery process IN the SOFA
qhrS r7arrracrure about s. to % per cent Of the
soda ash is recovered. and the help is reduced iIo
eixtv 10 two men. one for each shift
ruu COMpONENTS OF ROOK PAPER