Method for producing crude tall oil by soap washing with calcium carbonate removal
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
D21C-011/00
C11B-013/00
출원번호
US-0302471
(2011-11-22)
등록번호
US-8419897
(2013-04-16)
발명자
/ 주소
Bowles, Robert E.
Foran, C. Douglas
Griffin, Joseph H.
Swann, F. Edwin
출원인 / 주소
Arizona Chemical Company, LLC
인용정보
피인용 횟수 :
2인용 특허 :
17
초록▼
A method for producing crude tall oil from black liquor soap while removing calcium carbonate and lignates is disclosed. Black liquor soap is first combined with an alkaline ash medium having a lower concentration of lignates and inorganic solids than the black liquor soap, to form washed tall oil s
A method for producing crude tall oil from black liquor soap while removing calcium carbonate and lignates is disclosed. Black liquor soap is first combined with an alkaline ash medium having a lower concentration of lignates and inorganic solids than the black liquor soap, to form washed tall oil soap, fortified brine, lignates, and calcium carbonate. The washed tall oil soap is then separated from the fortified brine, lignates, and calcium carbonate, by centrifugation, decantation, filtration, settling, or a combination of these techniques. Acidification of the washed tall oil soap gives crude tall oil and a spent acid mixture. The crude tall oil is separated from the spent acid. The spent acid is made alkaline, and at least a portion of it is returned for use as alkaline wash medium. The method avoids accumulation of calcium sulfate in acidulation units.
대표청구항▼
1. A method for producing crude tall oil from black liquor soap while removing calcium and lignates, comprising: (a) combining a black liquor soap comprising tall oil soap, lignates. and inorganic solids comprising calcium carbonate, with an alkaline wash medium, wherein the alkaline wash medium has
1. A method for producing crude tall oil from black liquor soap while removing calcium and lignates, comprising: (a) combining a black liquor soap comprising tall oil soap, lignates. and inorganic solids comprising calcium carbonate, with an alkaline wash medium, wherein the alkaline wash medium has a pH from 10 to 14 and a lower concentration of lignates and inorganic solids than the black liquor soap, at a temperature within the range of 25° C. to 100° C. to produce a mixture comprising washed tall oil soap, fortified brine, lignates, and calcium carbonate; wherein the alkaline wash medium has a lignate content <1.0 wt. % and a filterable inorganic solids content <200 ppm:(b) separating the mixture by centrifugation, decantation, filtration, settling, or a combination of these techniques to provide, in addition to the washed tall oil soap: (i) a solid phase comprising calcium carbonate, and a liquid phase comprising fortified brine; or(ii) an unclarified, fortified brine phase;(c) acidifying the washed tall oil soap isolated in step (b) to give crude tall oil and a spent acid mixture; and(d) isolating the crude tall oil. 2. The method of claim 1 further comprising (e) adjusting the pH of the spent acid mixture to be within the range of pH =10 to 14 and returning at least a portion of it to step (a) as alkaline wash medium. 3. The method of claim 1 further comprising transferring the fortified brine to a weak black liquor storage unit. 4. The method of claim 1 further comprising washing the solid phase with water to give calcium carbonate and an aqueous lignate phase. 5. The method of claim 4 further comprising converting the calcium carbonate to lime for use in a Kraft process. 6. The method of claim 4 further comprising recovering lignates from the aqueous lignate phase for use as a biofuel component. 7. The method of claim 1 wherein the unclarified, fortified brine phase is sent to a transfer point in a Kraft plant that is downstream from a multi-effect evaporator system and upstream from a recovery boiler in the plant's liquor system. 8. The method of claim 7 wherein the transfer point is upstream from or directly into either a liquor concentrator or a direct contact evaporator and is upstream from the recovery boiler. 9. The method of claim 1 wherein the unclarified, fortified brine phase is clarified by centrifugation, decantation, filtration, settling, or a combination of these techniques to remove calcium carbonate and recover a clarified, fortified brine. 10. The method of claim 9 wherein the clarified, fortified brine is sent to a transfer point in a Kraft plant that is downstream from a multi-effect evaporator system and upstream from a recovery boiler in the plant's liquor system. 11. The method of claim 1 wherein the amount of alkaline wash medium is within the range of 1 to 60 wt. % based on the combined amounts of black liquor soap and alkaline wash medium. 12. The method of claim 1 wherein the alkaline wash medium has a lignate content within the range of 0.01 to 0.9 wt. % and a filterable inorganic solids content within the range of 10 to 175 ppm. 13. The method of claim 1 wherein step (a) is performed at a temperature within the range of 55° C. to 95° C. 14. The method of claim 1 wherein the alkaline wash medium has a pH within the range of 10.0 to 11.5.
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이 특허에 인용된 특허 (17)
Kjellberg,Nils, Brine separation in tall soap oil preparation.
Iivonen Mauno,FIX ; Koskinen Kari,FIX ; Kurkio Jarl,FIX ; Ramark Hannu,FIX ; Turunen Esko,FIX, Method and plant for separating soap from black liquor using a pressure screen.
Huibers Derk T. A. (Pennington NJ) Daniels Roger W. (Savannah GA) Niksa Marilyn J. (Concord OH) Coin Richard J. (Mentor OH) Elliott Joseph (Painesville OH), Method for the manufacture of tall oils.
Otrhalek Joseph V. (Dearborn MI) Gomes Gilbert S. (Southgate MI) Elfers Gunther H. (Grosse Ile MI), Method of recovering tall oil from acidulation of raw tall oil soap.
Mannbro Nils Viktor (Asarum SW), Method, applied in the production of tall oil, of preventing or reducing the emission of odorous sulphur compounds and/o.
Fuenzalida Diaz Miguel Angel,CLX ; Markovits Rojas Alejandro,CLX ; Leiva Hinojosa Roberto Benito,CLX ; Markovits Schersl Endre,CLX, Process for obtaining unsaponifiable compounds from black-liquor soaps, tall oil and their by-products.
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