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'. flee: G-[~'-~j°~ DDG , N0.vrtC' • VD) d tt0 ~ ~S ~>r~ ~ ~,Z S United States Patent [19J Stevenson [lt] Patent Number: ~,~88,713 [a3J Date of Patent: Dec_ 31, 1996 [i4~ PROCESS FOR ~LAIO;.NG SODIUM BICARBONATE FROM NAHCOLIIE-RICK SOLLTIONS 176) inventor. Tom D. SteveosoD. ?413 Pelham Dr., Houston. Tex. 77019 [21 ~ Appl. No.: ~S,1i83 [22J Filed: Dec 20, 1995 [31J InL CI.° _.._..._._.._..__.. E21B 43128: E2!C 41/20: CO1D 7/10 [521 U.S. CI......_.._..__._._.._._..._._.__._.. 399/5; 423/4?? [38~ Field of Search ..._._.___......_._...... 166(303; 299/4, 299/5; 4?3/189. 20fi.2, 422 [i6) Re(erenrs Cited U.S. PATENT DOCUM~VTS 1.863.333 711932 Gsesm ._.._._.._._......_.. ... a23/aT? X J.759~28 9!1973 Eu6er e; al. __._..........._. ....... !fi6l307 3.739S7a 9/1977 Beard _.._._......__...._.. _.._._.. 299/4 7.779.602 1'J1973 Bcvd ct al. __...._........_. ..._..._. 299/5 3.780.160 !J1973 Wag;exr c[ al..._........_. _.:3/189 X 3.79"! 902 J197a Towcil ct al ..................._. ......._. 299/5 3.868."", J1973 Fr_vel et al .................__.. .._.. a23/aT>? ?91.002 9/I981 AmDtdaal..._._._ .......... ...... 4?3/!89 :,375.302 3/1987 Kalmu _._.._.._.._.._._. ___.._. 299/a a?98.706 2/1983 Mardi c al...._._..._._....... ...._.... 299/5 x,815.790 3/1989 Rmar c: al. .._._.__._.__. _.__.... 299/a 3?73,79a U199a Luna -_......_......_.._._.. _. ,'_3/x2'_ X Primary F_rnrm"net--Geot~c .+.. Suchtield A:romn', dgent, or Firm-Kcncth A. Roddy ?RE:NANT LIOUDR `AOY NAXCSLIT= NZME NAXCDLITE lQNE NOT COMOQISATE TO KANCD:=TE .PINE X:GN PLTITY SDDIUX RICARaDNATE HIGH PDRITY SALT [57] ABSTRACT A procus for making sodium bicarbonate from Nabcoli[e- rich soiutioos udlizu solubility suopression with adaidon of sale Hot wazcr pumped in[o a Nahcolite-rich iornazion. winch may contain salt (NaCI) and other imouri[ies in ucrss of 696 by weight dissolve the Nahcolite (NaHCO,) and salt The dissolved Naheolite u hmught [o the surface as a ptegnan[ brine liquor contaittin¢ Nahcolite, salt. and other impurities, which is theo de-gassed under prusure. The ptegltast[ liquor is then mined with a salt slum and ils tcmperazme ((Gerd to satura[e i[ with salt and force pre- cipitation of Nahcolite out of the megnant liquor. Carbon dioxide (CO,) is injected while r..ixing the pregnait liquor with the salt to iac.Iitate Drccioitation and convctsion of any sodium carbonate (:Va.C,) prescu inw sodium biro: bonate (NaHCO,). The sodium bicarbonate (NaHCO,) is dewa- ten:d and filtered [o form a sodium bicarbonate (NaHCO,) filter cake, which is wished wi[h fish cold wazcr to remove salt (NaCI), sodium cabonate (Na_C0,), and o[hcr impu- ridcs as a salt-rich brine filtrate, and the inter ci<e is dried tD produce a high grade of natural sodium bicarbonate (NaHCO,). Tie filtrate may be Drocessed to produce hot walCr mndensarn width can then he used to dissDlve the Nahcoli[e, and the salt slum produced can be used m saturaze the ptegnaot liquor and force Nahrnl:te prednita- tion, and a portion may be dried and used as a saleable by-pmducL 12 Claims, ? DrasviDg Sheets SUPPLf]DDrl'AL COa PREGXARr LIDDOR COO L'MC AND GRaON DIOYID[ RECOVERY UMZT PRESx PURCe cal NATER I SO0IU1 9ICARRONATC DEYATERINU AND SALS PURGING UNIT i :W(E-UP SALT 4A'TII~t 7I '.'ATER pl UpCL ' SODIVN 9ICARpONATE DRYING UNIT SALT DRYING UNIT III IIIIIIIIIIIIIIII-~ sss U500558 loA SCOIUN aICAPHONATE PLDS SALT XIYFA ANp DECANT Im:T ISALT S..UItAYI I SALT 3RZNE I SALT aRINE vAiOR RECONPRLSSIDH SALT RtYSTALIZER WRIT SALT aRINE SILT OL'JAT`~tiND UNIT