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1. 发明专利

JP3735970B2 How to decompose and remove the organic matter of the phosphoric acid solution 失效
公开(公告)号：JP3735970B2
公开(公告)日：2006-01-18
申请号：JP29290196
申请日：1996-11-05
申请人：東ソー株式会社
发明人：富良藤原 , 信之谷口
IPC分类号： C01B25/237

2. 发明专利

JPH0648711A PURIFICATION OF PHOSPHORIC ACID LIQUID 失效
公开(公告)号：JPH0648711A
公开(公告)日：1994-02-22
申请号：JP20508892
申请日：1992-07-31
申请人： MITSUI TOATSU CHEMICALS
发明人： SHINOZAKI TAKEKI
IPC分类号： B01J20/20 , C01B25/237
摘要： PURPOSE:To effectively remove organic substances in phosphoric acid liquid to permit the long period employment of active carbon. CONSTITUTION:In the method for removing organic substances in phosphoric acid liquid with active carbon, hydrogen sulfide gas in an amount of 1-10 weight ppm based on the phosphoric acid liquid is preliminarily dispersed in the phosphoric acid liquid at a temperature of 30-80 deg.C, followed by passing the dispersion through an active carbon tower filled with coal active carbon.

3. 发明专利

JPH03232711A METHOD FOR REMOVING ORGANIC SUBSTANCE IN WET PROCESS PHOSPHORIC ACID 失效
公开(公告)号：JPH03232711A
公开(公告)日：1991-10-16
申请号：JP2856490
申请日：1990-02-09
申请人： TOSOH CORP
发明人： NAKATANI MASAKI , NOMURA KOICHI , HISARAKU KENJI
IPC分类号： C01B25/237 , C01B25/235
摘要： PURPOSE:To efficiently remove organic substances in wet process phosphoric acid by reacting the wet process phosphoric acid with a chlorate and subsequently reacting the resultant phosphoric acid liq. with hydrochloric acid in the presence of an inert gas. CONSTITUTION:Wet process phosphoric acid prepared by decomposing unburned phosphate rock with sulfuric acid and having an organic substance content of 200-400ppm (converted into carbon) is charged into a reactor comprising two or more tanks connected to each other in series and subsequently reacted with a chlorate (e.g. NaOCl3) in an amount of >=6 times that of the organic substances in the wet process phosphoric acid, the chlorate not producing insoluble substances when reacted with the sulfate radical in the wet process phosphoric acid, and, if necessary, further with such an amount of a Fe source as giving Fe ions in an amount of >=0.016 time that of P2O5 at a temperature of 110 deg.C to the boiling point of the reaction liq. continuously for 1-10 hours with stirring to prepare a phosphoric acid liq. containing the remaining chlorate in a concentration of 0.02-0.5wt.%. The prepared phosphoric acid liq. is continuously reacted with hydrochloric acid in an amount of >=1mol times that of the remaining chlorate at a temperature of 50 deg.C to the boiling point of the reaction liq. for 0.5-3 hours, while bubbling the reaction liq. with an inert gas in a volume of >=150vol% that of the phosphoric acid liq.

4. 发明专利

JPH021086B2 失效
公开(公告)号：JPH021086B2
公开(公告)日：1990-01-10
申请号：JP50108280
申请日：1980-05-08
申请人： BOLIDEN AB
发明人： BERUGURUNDO HANSU ARUNE RENNAATO
IPC分类号： C01B25/237 , C01B25/238

5. 发明专利

JPS6353121B2 失效
公开(公告)号：JPS6353121B2
公开(公告)日：1988-10-21
申请号：JP1925280
申请日：1980-02-20
申请人： MITSUI TOATSU CHEMICALS
发明人： MARUYAMA KENSAKU , KITAGAWA YORIHISA , KAMATA HIDEO , OOE TAKASHI
IPC分类号： C01B25/238 , C01B25/234 , C01B25/237

6. 发明专利

JPS6112846B2 JPS6112846B2 - 失效
公开(公告)号：JPS6112846B2
公开(公告)日：1986-04-10
申请号：JP13807382
申请日：1982-08-10
申请人： Hoechst Ag
发明人： GYUNTAA SHINMERU , AREKUSANDAA MAURAA , GERO HAIMAA , RAINHARUTO GURAATORU
IPC分类号： C01B25/237 , C01B25/235
CPC分类号： C01B25/235

7. 发明专利

JPS5761683B2 失效
公开(公告)号：JPS5761683B2
公开(公告)日：1982-12-25
申请号：JP2076679
申请日：1979-02-26
申请人： MITSUI TOATSU CHEMICALS
发明人： KOBAYAKAWA TADAHIRO , MARUYAMA KENSAKU , KITAGAWA YORIHISA , KAMATA HIDEO , OOE TAKASHI
IPC分类号： C01B31/08 , B01J20/20 , B01J20/30 , C01B25/234 , C01B25/237

8. 发明专利

JPS5743524B1 失效
公开(公告)号：JPS5743524B1
公开(公告)日：1982-09-16
申请号：JP8517771
申请日：1971-10-28
IPC分类号： C01B25/237 , C01B25/238

9. 发明专利

JPS5731525B2 失效
公开(公告)号：JPS5731525B2
公开(公告)日：1982-07-05
申请号：JP28078
申请日：1978-01-06
IPC分类号： C01B25/237 , C01B25/18

10. 发明专利

JPS56120509A PURIFYING METHOD FOR WET PROCESS CRUDE PHOSPHORIC ACID 失效
公开(公告)号：JPS56120509A
公开(公告)日：1981-09-21
申请号：JP1925280
申请日：1980-02-20
申请人： MITSUI TOATSU CHEMICALS
发明人： MARUYAMA KENSAKU , KITAGAWA YORIHISA , KAMATA HIDEO , OOE TAKESHI
IPC分类号： C01B25/238 , C01B25/234 , C01B25/237
摘要： PURPOSE:To simply remove arsenic in wet process crude phosphoric acid to =0.2 time as much as dissolved org. carbon in the acid by wt. expressed in terms of hydrogen sulfide and >=1 equiv. to contained arsenic, and they are reacted with stirring. After the reaction the liq. reaction product is filtered to obtain a precipitate-free filtrate. When the amount of added hydrogen sulfide reaches a certain amount or more, the arsenic removing effect is improved remarkably. The reason is estimated as folows: since sulfur-contg. org. matter is formed simultaneously with the precipitation of arsenic sulfide, when the amount of added hydrogen sulfide is a certain critical amount or less, hydrogen sulfide in phosphoric acid does not act effectively. Thus, arsenic sulfide is not formed well, resulting in an inferior arsenic removing effect.

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