-
公开(公告)号：DE3513744A1
公开(公告)日：1986-10-23
申请号：DE3513744
申请日：1985-04-17
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER DIPL ING , HAAS HANS DIPL CHEM DR , DAHMEN THEO , ERPENBACH MARKUS
Abstract: Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 320 g/l are made. To this end, an aqueous alkali metal orthophosphate solution and an aqueous solution of an inflating agent are simultaneously forced under a pressure of 6-40 bars into a fluidization zone; the two solutions are fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the two solutions and the fluidized solutions are sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone produced inside the spray tower. Apparatus for carrying out the process.
-
公开(公告)号：ZA8205909B
公开(公告)日：1983-07-27
申请号：ZA8205909
申请日：1982-08-16
Applicant: HOECHST AG
Inventor： MAURER ALEXANDER , HEYMER GERO , ERPENBACH MARKUS
CPC classification number: C01B25/24
-
公开(公告)号：DE3132428A1
公开(公告)日：1983-02-24
申请号：DE3132428
申请日：1981-08-17
Applicant: HOECHST AG
IPC: C01B25/24
Abstract: The disclosure relates to a process for the continuous dearsenification of polyphosphoric acid with the aid of hydrogen sulfide in a gas admission zone. To this end, the disclosure provides for the acid to be dearsenified in a gas admission zone subdivided so as to comprise at least two separate liquid matter-receiving zones, each zone being separated from the other by means of a separate gas zone; for the liquid in each of the liquid matter-receiving zones to be maintained at a level 0.1 up to 10 cm high, without admission of gas; for hydrogen sulfide which remained unreacted in the individual liquid matter-receiving zones to be collected in the respective gas zone and for it to be finely redispersed in the liquid matter-receiving zone directly upstream of the respective gas zone by allowing the hydrogen sulfide to flow through a plurality of openings into the acid, the latter being delivered from the respective liquid-matter-receiving zone into the next downstream liquid-matter-receiving zone, and introduced thereinto directly below the liquid matter level therein; for precipitated arsenic sulfide to be separated from the acid coming from the lower end of the gas admission zone, and for the filtrate obtained to be freed from gaseous hydrogen sulfide in excess.
-
公开(公告)号：DE3682931D1
公开(公告)日：1992-01-30
申请号：DE3682931
申请日：1986-03-27
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER , HAAS HANS DR , DAHMEN THEO , ERPENBACH MARKUS
Abstract: Alkali polyphosphates (I) with hollow spherical granule structure and a bulk density of less than 320 g/l (pref. 200-300 g/l) are new. (I) are prepd. by spraying aq. alkali orthophosphate solns. (II) under a pressure of 6-40 bar through a flame zone in a spray tower. (II) is sprayed in conjunction with an aq. soln. (III) of a blowing agent by forcing a permanent gas (IV) in finely divided form into a vortex zone filled with these soln. and connected with the nozzles, this gas being under a higher pressure than (II) and (III). The blowing agent is alkali carbonate and/or bicarbonate and (IV) is compressed air, CO2 or N2. The (IV) pressure is at least 20% higher, than the pressure on (II) and the amt. of (IV) used is 1.5-40, pref. 2-6 Ncu.m/cu.m (II).
-
公开(公告)号：DE3670825D1
公开(公告)日：1990-06-07
申请号：DE3670825
申请日：1986-03-27
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER , HAAS HANS DR , DAHMEN THEO , ERPENBACH MARKUS
Abstract: Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 350 g/l are made. To this end, an alkali metal orthophosphate solution is forced under a pressure of 6-40 bars into a fluidization zone; the orthophosphate solution is fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the orthophosphate solution; and the fluidized orthophosphate solution is sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone peoduced inside the spray tower. Apparatus for carrying out the process.
-
Patent Agency Ranking
公开(公告)号：DE3513743A1
公开(公告)日：1986-10-23
申请号：DE3513743
申请日：1985-04-17
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER DIPL ING , HAAS HANS DIPL CHEM DR , DAHMEN THEO , ERPENBACH MARKUS
Abstract: Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 350 g/l are made. To this end, an alkali metal orthophosphate solution is forced under a pressure of 6-40 bars into a fluidization zone; the orthophosphate solution is fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the orthophosphate solution; and the fluidized orthophosphate solution is sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone peoduced inside the spray tower. Apparatus for carrying out the process.
-
公开(公告)号：GB2105314B
公开(公告)日：1985-01-03
申请号：GB8223151
申请日：1982-08-11
Applicant: HOECHST AG
Inventor： HEYMER GERO , MAURER ALEXANDER , ERPENBACH MARKUS
IPC: C01B25/24
Abstract: The disclosure relates to a process for the continuous dearsenification of polyphosphoric acid with the aid of hydrogen sulfide in a gas admission zone. To this end, the disclosure provides for the acid to be dearsenified in a gas admission zone subdivided so as to comprise at least two separate liquid matter-receiving zones, each zone being separated from the other by means of a separate gas zone; for the liquid in each of the liquid matter-receiving zones to be maintained at a level 0.1 up to 10 cm high, without admission of gas; for hydrogen sulfide which remained unreacted in the individual liquid matter-receiving zones to be collected in the respective gas zone and for it to be finely redispersed in the liquid matter-receiving zone directly upstream of the respective gas zone by allowing the hydrogen sulfide to flow through a plurality of openings into the acid, the latter being delivered from the respective liquid-matter-receiving zone into the next downstream liquid-matter-receiving zone, and introduced thereinto directly below the liquid matter level therein; for precipitated arsenic sulfide to be separated from the acid coming from the lower end of the gas admission zone, and for the filtrate obtained to be freed from gaseous hydrogen sulfide in excess.
-
公开(公告)号：CA1282573C
公开(公告)日：1991-04-09
申请号：CA506779
申请日：1986-04-16
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER , HAAS HANS , DAHMEN THEO , ERPENBACH MARKUS
Abstract: 23343-808 SPHEROIDAL ALKALI METAL POLYPHOSPHATES OF LOW APPARENT DENSITY, AND PROCESS AND APPARATUS FOR MAKING THEM Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 350 g/l are made. To this end, an alkali metal orthophosphate solution is forced under a pressure of 6-40 bars into a fluidization zone; the orthophosphate solution is fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the orthophosphate solution; and the fluidized orthophosphate solution is sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone produced inside the spray tower. Apparatus for carrying out the process.
-
公开(公告)号：CA1270620A
公开(公告)日：1990-06-26
申请号：CA506780
申请日：1986-04-16
Applicant: HOECHST AG
Inventor： KOWALSKI WERNER , HAAS HANS , DAHMEN THEO , ERPENBACH MARKUS
Abstract: SPHEROIDAL ALKALI METAL POLYPHOSPHATES OF LOW APPARENT DENSITY, AND PROCESS AND APPARATUS FOR MAKING THEM Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 320 g/l are made. To this end, an aqueous alkali metal orthophosphate solution and an aqueous solution of an inflating agent are simultaneously forced under a pressure of 6 - 40 bars into a fluidization zone; the two solutions are fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the two solutions and the fluidized solutions are sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone produced inside the spray tower. Apparatus for carrying out the process.
-
公开(公告)号：ZA825909B
公开(公告)日：1983-07-27
申请号：ZA825909
申请日：1982-08-16
Applicant: HOECHST AG
Inventor： MAURER ALEXANDER , HEYMER GERO , ERPENBACH MARKUS
Abstract: The disclosure relates to a process for the continuous dearsenification of polyphosphoric acid with the aid of hydrogen sulfide in a gas admission zone. To this end, the disclosure provides for the acid to be dearsenified in a gas admission zone subdivided so as to comprise at least two separate liquid matter-receiving zones, each zone being separated from the other by means of a separate gas zone; for the liquid in each of the liquid matter-receiving zones to be maintained at a level 0.1 up to 10 cm high, without admission of gas; for hydrogen sulfide which remained unreacted in the individual liquid matter-receiving zones to be collected in the respective gas zone and for it to be finely redispersed in the liquid matter-receiving zone directly upstream of the respective gas zone by allowing the hydrogen sulfide to flow through a plurality of openings into the acid, the latter being delivered from the respective liquid-matter-receiving zone into the next downstream liquid-matter-receiving zone, and introduced thereinto directly below the liquid matter level therein; for precipitated arsenic sulfide to be separated from the acid coming from the lower end of the gas admission zone, and for the filtrate obtained to be freed from gaseous hydrogen sulfide in excess.
-
-
-
-
-
-
-
-
-
Search Results
11
records
(took 0.023 seconds)
