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CLJ J J iJ ~i~LiJ <br /> <br />C~) <br />• x,588,713 <br />solutions by tut of solubility suppression w:[h addition of <br />salt. <br />]t is another ob)ed of this ulvcntion to provide a process <br />(or making sodsum bicarbonatr. hnm Nahcetite•rich solu- <br />tions which conscrvcs water by utilrz:ng nuarmal quarsoues <br />of wamr in the procrss. <br />Another objeC o(thia inventlon is [o provide a mdcev for <br />r..aw.ae sodium hicsbooatt from Nahcolitc rich solutivm <br />which conserves enugy by recycling hot urondensstc pro- <br />duced in the process for use m the initial step of dissolving <br />Nshcoli[c Cmm Nc larrruuan. <br />Another objeU oCthis invendon ss m provide a process (or <br />malting sodium hicarbona[c from Na'scotile-nch solutions <br />which is not in0uetltsd by the purity of she pmgrrant liquor. <br />Anathn object oC tlsis invention is to provide a prorrss (ar <br />making sodium 6irarhona[e from NahCOli[o-rich solutions <br />which can oe used to mcnvrt Nahcolile from salt con;arvt- <br />na;cd Cormations er stuCar-c pmces~tng Carilitia whcm the <br />orcgnant liquor conusns salt m cuss Of fiSE. <br />a ftsrthc: o6Lect of this tnvcos;on v to provide a process <br />fo: malting sodium hrrarbonatc ltom Nahcolise-rich solo <br />tons which oroduoes soft (Ned) as a salrablr. 6y-pmdut: <br />and climinatu the recd Car larva surfarf' con:disuncn[ arrA. <br />Cnr collection of pwge lieuors <br />A will funhcr object oI dos invrndan is m ntovide a <br />pmr_ss for making pure sodium bicarbonate fiom Nan <br />eelite nch selutians which is highly elheirot end cost effec- <br />tive <br />Orhrr nbjecu of the invmpon wi0 become apvarent From <br />:imc to tints throughout tic epcahrwtivn and clarva as <br />hcrcioaCta re!azcd. <br />The above cored objctts utd other ebjeces of the imcntion <br />arc a¢omplished by a pmctxs Car Taking sodiun 6ir~r- <br />bonatc from Nahcolite•rich solutions w,yirlt utilizes wluhi]- <br />rry suvpresuon with adtLition of sale Ho[ water pumped inm <br />a Nnhcoiue riL-h (Donation. which mar comain salt (Naa) <br />and othr. impurities ir, ceecss of 6% by wtigha_ dissolver nc~ <br />h'ahcofise (NaHCt1t) and salt The devolved \ahrAlite is <br />hrougN :o [iu surfaa az a pregnant brine liquor containing <br />\ahrolu-, va1L aid otter. impurities, wroth is thcv deggcssed <br />under pmssum. Tht pregnant liquor is thrn vsued with a sot <br />slurry and in tcmpe-ar.uc induced w satmatc it with sal: aad <br />force precipiuuon of Nahwlire out aC the umgrunt liquor. <br />Carona divxirie (COr) is injascd while mixing the pregvans <br />liquor with the salt la fadlitalc prramutiav avd convcsion <br />of any sodium carbonate (Na..CO,) ptrsent into sodium <br />hirzrbonatc (NaHCOs) The sodium bir~rbenare (h'aHCO,) <br />is dcwatcmd trod filtered w form a sodium hinrbovatc <br />(VaHC05) fdre cake, which is washed with Cruh told warty <br />:o remove salt (VaCI), svdnuu carbonate (Na.('Or), avd <br />other impurica as a colt note brine filtrate, and the filtu cake <br />is dried to produrt a high grade of ttaaval sodium bicar- <br />bonatt (NaHCDs). The fdtrate may be pnoccsscd m product <br />hot watu wedrnsatc which c: n then be used to Aissolvc the <br />~sheolite, and the salt slue. produced can hr used to <br />sammr the pregnant liaum avsl forrL Naheoliu: puipiu- <br />tton, and z portion may ee Mcd and used as a saleable <br />ay-product. <br />BRIEF DFSCRIP'FIOts' OF 7"HE DRAWINGS <br />F1G. I is a schrsutic flow diavmm rliuSiraLing the proems <br />far mafdig sodium 6tmuLntute from Nahcolite-nch solo <br />bons in accnrdarvr. with the pmscnt inventioe <br />FIG. 2 rs a graph shoving solubility of various mires of <br />sodium hicaz;sonatc (; La({CO~) and salt (NaCI) ar various <br />te;npuatures in dcg:ces F. <br />• <br />DEGCRIPTION OF THE PREFERRED <br />Eh1BODINE.VT <br />Rcfcning m thr dawings by nummus oC xfcrnc, there <br />s Is shown sch~arically in FIG 7, a p:e(cr:ed process (or <br />rnaldng sodn.m birarborratc (NaHCO,) Fram Nahcolitc-rich <br />solutions by use vF wluhiiity suppsesaion wish addition of <br />sal[ (VaC7) :~ accordance with the pres[nt in.ention. The <br />process is cturzmtratd by Lhe follnwld~ steps. <br />to (a) Hot watt (Ii,0) in the temperuwc range of Gom <br />shoos l60° F. to about ?30° F is pumocd at a presssvc <br />of about 150 prig mto an urdcrground NahcOlitc <br />(NaHCO,)•rch formation. which may contain salt <br />(NaC1) and o:hc:mpuri;ia in excess of 6%by wesoht, <br />l5 to d:ssalve nc~ Nahcolitc (NaHCOs) and salt, <br />(b) The dissolved Nahwlitc (~iaHCO,) is brought re rltc <br />surface nr tnc (omauon m the form of a sawrarrd brine <br />pmgnan[ !iouor solutiao containing Nahrdlim and shay <br />also conain sus (NaCq and other tmpuritics in excess <br />m of 6% by wngnr <br />(c) Thc pmgr~nt liquor solution is de gassed under a <br />p¢sswc in tlsr ranQc of Lim about 100 prig to show <br />70 psrg m a ptasum controlled system: <br />(C) The de ~asicd pregnant lieuor mlu[ion is mood wt:lt <br />a salt (NaCI) slurry which may typically contain shoo: <br />90% or mere haC'I. by wet°ht of local Salo presaC and <br />the tcmpcmn:rc of [hc degassed tnYgvan: liquor solu- <br />tion is rr-0tsr~ m the range Of Gom about 200° F. w <br />about L60° F. which ss sv~ritnt [o sarruarc [hc dr <br />gassed pregnant Lquar solution. wish sale (NcCi) and to <br />force ptmpr:auou of Nahcohtc (NaHCOs) our of she <br />degassed p¢gnan: liquor mlmren: <br />(c) While mixing the dc-gassed pregeant liquor aolutron <br />with the salt (NaCI), carbon trioxide (COc) is m)ected <br />mm sbc mixture m Cacshum pmcipitaden and ronve• <br />non of any sodium tar'voruK (Na_COr) pmscn[ into <br />sodsum hiraroottate (h'aHCOs): <br />(f) Thr. sotbum bitamonate (NzHCO,) is dewuemd and <br />Rlrcmd, urine a rom6rvetion of hydrocycloars and a <br />vacuum Wstt or ttanifu~e, ro form a sodmn biear- <br />6ona[c (ivaHCOs) filler cake, and the hI[cr Cake is <br />weshcC with (rote cold warty [o remove salt (tiaC1). <br />sodium carbonate (NarCO,), and other impurisies as a <br />salt-rich bleat blrratc. and thnea!trf <br />(g) The wasisdl sssdsum biwoorute (NaHCOs) biter cake <br />is dried to produce a hign ~adc of mural sodium <br />bit-arbottart (M1aHCO~). <br />To farilita[e tDe morass of dc-°assmg :hc pregr^r liquor <br />soluooe and forcing pmcitsitadoe of Naamlire (NaHCO,), <br />the pregnant liquor wlu[ion uvde pressure in the orcbsinrd <br />cootm0ed systm u Sion (c) may also lie covl~ az this sine <br />m a tempcraturc m Stec cangc of from about 160° F. m about <br />70° F. poor tq maating it with tae tut (NaCI) slurry. and item <br />furlhu rca, crxl to a tcmpcran:rc in the rouge of from about <br />70° F m abouu 50° F. as is is mixes with the salt (F:aQ) <br />shirty a: step (d). <br />The eBnrncy a.~u1 wst effectiveness of the otrxrnt pro- <br />cess is irepro•r~ by orocesstog the Sall-ti[F. brine blfta[e <br />wotammg salt (NaCI), sodium cffitranam (NaaCOs), and <br />othv rmpuritics, wttich was rrmnvcd during the washing <br />step (f), using mrzha.-tital rrzomnrtsron crysulvat;on, <br />mWUplc cdrrt rysaliaatioe, o- wave heat from a co- <br />grsseratioo plant m produre a hot condrlrsate of warty (Fit0) <br />and a salt (NaCl) slvtry. The hot condensate oCware-. (Hx0) <br />can then be pumped into Ue underQreuod Nan[ohtc <br />(NaHCO,}rich fnrvudon and vvd rn dissolve the tJahcoliu <br />zs <br />la <br />JS <br />so <br />as <br />so <br />SS <br />m <br />as <br />