System for phosphoric acid production with decreased foaming
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-019/18
C01B-025/222
출원번호
US-0866989
(1978-01-05)
발명자
/ 주소
Gragg Fredrick M. (Riverside CA) Ellis John D. (Upland CA) Adams Allen S. (Jasper FL)
출원인 / 주소
Occidental Research Corporation (Irvine CA 02) Occidental Chemical Company (Irvine CA 02)
인용정보
피인용 횟수 :
2인용 특허 :
3
초록▼
A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, includes in combination a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, a second reaction vessel containing a second slurry comp
A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, includes in combination a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, a second reaction vessel containing a second slurry comprising calcium sulfate hemihydrate, circulation means including a draft tube disposed centrally in each of said vessels and an agitator positioned axially in each of said vessels within said draft tube, a first conduit interconnecting said first and second reaction vessels for conducting said first slurry from said first reaction vessel to said second reaction vessel, a second conduit interconnecting said vessels for conducting said second slurry from said second reaction vessel to said first reaction vessel, an inlet pipe for introducing phosphate rock and phosphoric acid to said first reaction vessel, said inlet pipe connected with the interior of said draft tube in said first vessel and wherein a vent is connected to said inlet pipe to permit escape of gases and, thus, increasing the rate of flow of said phosphate rock and phosphoric acid to said first reaction vessel.
대표청구항▼
A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, including in combination: (a) a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, (b) a second reaction vessel containing a second s
A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, including in combination: (a) a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, (b) a second reaction vessel containing a second slurry comprising calcium sulfate hemihydrate, monocalcium phosphate, sulfuric acid and phosphoric acid, (c) means including a draft tube means in each of said vessels for maintaining a continuous circulation of the slurry therein through said draft tube means at a rate of at least 50% of the volume of the slurry in said vessel per minute, said last mentioned means including a singlewall draft tube disposed centrally in each of said vessels and an agitator means positioned axially in each of said vessels within said draft tube, whereby on actuation of said agitator means the slurry in each of said vessels will flow from the bottom portion of said draft tube up through the draft tube and on exiting the top of the draft tube, the slurry will flow downwardly in the space between said draft tube and the inner wall of the vessel, (d) a first conduit means interconnecting said first and second reaction vessels for conducting said first slurry from said first reaction vessel to said second reaction vessel, (e) a second conduit means interconnecting said vessels for conducting said second slurry from said second reaction vessel to said first reaction vessel, (f) means for providing reduced pressure to said second reaction vessel to effect temperature control in said second reaction vessel by evaporation, means to circulate slurry between said second reaction vessel and said first reaction vessel at a sufficient rate so as to add desired sulfate values and phosphoric acid values to and to effect temperature control in said first reaction vessel, and means to form a vacuum seal between said first and second reaction vessels, (g) an inlet pipe means for introducing a mixture of phosphate rock and phosphoric acid to said first reaction vessel, said inlet pipe means having discharge means to the interior of the draft tube in said first vessel, (h) means for introducing sulfuric acid to said second reaction vessel, (i) means for withdrawing a slurry containing phosphoric acid and calcium sulfate hemihydrate from said second reaction vessel, and, (j) a vent means connected to said inlet pipe means to permit escape of gases and reduce foaming generated by the dissolving reaction in said first vessel.
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이 특허에 인용된 특허 (3)
Kimura Shinichi (5-34 ; 5 JO ; Misono Toyohira ; Sapporo ; Hokkaido JA), Device for separating air bubbles of fluids in piping, and silencing water flow.
Drechsel Erhart K. (Montgomery TX) Holcomb Dysart E. (Shreveport LA) Sardisco John B. (Shreveport LA), Production of phosphoric acid and additional products from phosphate ore.
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