公开(公告)号：BR8007397A

公开(公告)日：1981-05-26

申请号：BR8007397

申请日：1980-11-13

Applicant: HOECHST AG

Inventor： EHLERS K ,  GRADL R ,  SCHRODTER K

IPC: C01B25/234 ,  C01B25/237 ,  C01B25/46

Abstract: The invention relates to a process for the purification of wet-processed phosphoric acid with the aid of organic solvents which are immiscible or only partially miscible with water, the sulfate ions being removed by addition of barium compounds. The purification is carried out in an n-stage extraction installation, where n is equal to or greater than 5. The barium compound is added to the phosphoric acid to be purified, and the resulting mixture is fed to the top of the extraction installation, in which the organic solvent phase is dispersed in the aqueous phase. The sulfuric acid is led in counter-current fashion to the phosphoric acid by adding it to one of the stages n=4 to at most n-1.

公开(公告)号：BR8004138A

公开(公告)日：1981-01-21

申请号：BR8004138

申请日：1980-07-03

Applicant: HOECHST AG

Inventor： EHLERS K ,  GRADL R ,  SCHEIBITZ W ,  SCHRODTER K

IPC: C01B25/234 ,  C01B25/46

Abstract: The invention relates to the decontamination of wet-processed phosphoric acid with the use of organic solvents in a plurality of extraction zones, of which each is comprised of a mixing zone and a separating zone, the solvent being immiscible or partially miscible with water. Resulting organic phase and the aqueous phase are contacted countercurrently with respect to one another, the organic solvent phase being dispersed in the aqueous phase. To this end, the invention provides for the aqueous phase to be admitted to the mixing zone at the onset of the extraction, and for organic phase and aqueous phase to be continuously admitted in a volume ratio of at least 2.5:1 to the respective extracting zones in an overall quantity sufficient to provide, in the mixing zones of the extraction zones, a volume ratio of organic phase to aqueous phase of at most 1:1, which is maintained therein.

公开(公告)号：SE7714258L

公开(公告)日：1978-06-18

申请号：SE7714258

申请日：1977-12-15

Applicant: HOECHST AG

Inventor： EHLERS K-P ,  SCHEIBITZ W ,  SCHRODTER K ,  HEYMER G

IPC: C01B25/234 ,  C01B25/46

Abstract: Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

公开(公告)号：BR8001427A

公开(公告)日：1980-11-11

申请号：BR8001427

申请日：1980-03-11

Applicant: HOECHST AG

Inventor： SCHRODTER K ,  EHLERS K ,  GRADL R ,  SCHEIBITZ W

IPC: C02F1/58 ,  A62D3/36 ,  A62D101/45 ,  C01B25/234 ,  C01B25/46 ,  C02F11/00 ,  C02F101/10 ,  C02F101/20 ,  C02F101/22 ,  C02F103/34 ,  B01D11/04

公开(公告)号：BR7708378A

公开(公告)日：1978-08-08

申请号：BR7708378

申请日：1977-12-16

Applicant: HOECHST AG

Inventor： SCHRODTER K ,  EHLERS K ,  SCHEIBITZ W ,  HEYMER G

IPC: C01B25/234 ,  C01B25/46

Abstract: Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

公开(公告)号：SE7701433L

公开(公告)日：1977-08-11

申请号：SE7701433

申请日：1977-02-09

Applicant: HOECHST AG

Inventor： SCHRODTER K ,  SCHEIBITZ W ,  EHLERS K-P

IPC: B01D11/04 ,  C01B25/22 ,  C01B25/234 ,  C01B25/46

Abstract: For extracting phosphates with alcohol in the presence of water and a strong mineral acid, with the resultant formation of an alcoholic phosphoric acid solution and an aqueous salt phase, a plurality of mixing settlors are arranged one upon another, so that the bottom outlet for the aqueous salt phase of each mixing settlor serves as the feeder for the next mixing settlor below and the outlet for the alcoholic solution of each settlor is connected with the feed pipe for this solution of the next mixing settlor above. Each mixing settlor is subdivided by means of two partitions into a mixing chamber A, a separating chamber B and a settling chamber C. The said two partitions do not extend to the bottom of the mixing settlor and are arranged so that the three chambers A, B and C communicate with one another.

公开(公告)号：SE429543B

公开(公告)日：1983-09-12

申请号：SE7714258

申请日：1977-12-15

Applicant: HOECHST AG

Inventor： EHLERS K-P ,  SCHEIBITZ W ,  SCHRODTER K ,  HEYMER G

IPC: C01B25/234 ,  C01B25/46

Abstract: Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

公开(公告)号：PH13877A

公开(公告)日：1980-10-24

申请号：PH20553

申请日：1977-12-14

Applicant: HOECHST AG

Inventor： SCHEIBITZ W ,  EHLERS K ,  SCHRODTER K

IPC: C01B25/234 ,  C01B25/46 ,  C01B25/04

Abstract: Wet-processed phosphoric acid is purified by counter-current extraction with the use of an organic solvent, in which water is partially soluble and which is capable of absorbing phosphoric acid, the organic phosphoric acid extract is separated from residual wet-processed phosphoric acid, unabsorbed by the solvent, and phosphoric acid is recovered from the separated organic phosphoric acid extract. More specifically, the wet-processed phosphoric acid is extracted with the use of a solvent containing more than 0 and less than 50% of water, based on the saturation concentration, and a mineral acid in a quantity corresponding to the quantity, in moles, of cation-bound phosphate in the crude acid.

公开(公告)号：EG12631A

公开(公告)日：1979-12-31

申请号：EG7777

申请日：1977-02-08

Applicant: HOECHST AG

Inventor： SCHRODTER K

IPC: B01D11/04 ,  C01B25/22 ,  C01B25/234 ,  C01B25/46

Abstract: For extracting phosphates with alcohol in the presence of water and a strong mineral acid, with the resultant formation of an alcoholic phosphoric acid solution and an aqueous salt phase, a plurality of mixing settlors are arranged one upon another, so that the bottom outlet for the aqueous salt phase of each mixing settlor serves as the feeder for the next mixing settlor below and the outlet for the alcoholic solution of each settlor is connected with the feed pipe for this solution of the next mixing settlor above. Each mixing settlor is subdivided by means of two partitions into a mixing chamber A, a separating chamber B and a settling chamber C. The said two partitions do not extend to the bottom of the mixing settlor and are arranged so that the three chambers A, B and C communicate with one another.

公开(公告)号：PH14566A

公开(公告)日：1981-09-24

申请号：PH23785

申请日：1980-03-19

Applicant: HOECHST AG

Inventor： MAURER A ,  HEYMER G ,  SCHRODTER K

IPC: C01B25/237 ,  B01J23/00 ,  B01J23/54 ,  C01B25/235 ,  C01B25/163

Abstract: The invention relates to a process for freeing aqueous phosphoric acid solutions from organic contaminants. To this end, the solutions are admixed and reacted with hydrogen peroxide in the presence of a catalyst consisting of a noble metal or metal oxide being inert with respect to phosphoric acid or of a mixture of said noble metal and metal oxide.