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公开(公告)号：DE4323527A1
公开(公告)日：1995-01-19
申请号：DE4323527
申请日：1993-07-14
Applicant: HOECHST AG
Abstract: The present invention relates to a process for preparing crystalline sodium disilicate having a seat structure (layer structure) and a molar ratio of SiO2/Na2O of (1.8 to 2.2) : 1 in a pure delta phase from a waterglass solution having a molar ratio of SiO2/Na2O of (1.8 to 2.2) : 1 or an amorphous, water-containing sodium disilicate as starting material, which is characterized in that the starting material contains from 1 to 99 % by weight of water and is heated by microwave radiation in a heat-insulated reaction zone to from 400 to 800 DEG C.
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公开(公告)号：DE3925675A1
公开(公告)日：1991-02-07
申请号：DE3925675
申请日：1989-08-03
Applicant: HOECHST AG
Inventor： STAFFEL THOMAS DR , ADRIAN RENATE DIPL ING
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Patent Agency Ranking
公开(公告)号：DE4223545A1
公开(公告)日：1994-01-20
申请号：DE4223545
申请日：1992-07-17
Applicant: HOECHST AG
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公开(公告)号：DE4024241A1
公开(公告)日：1992-02-06
申请号：DE4024241
申请日：1990-07-31
Applicant: HOECHST AG
Inventor： STAFFEL THOMAS DR , ADRIAN RENATE DIPL ING
Abstract: To eliminate ammonia from steam-containing gases, in particular exhaust gases, the gases are brought into intimate contact with heated polyphosphoric acid, the polyphosphoric acid advantageously having a P2O5 content of 70 to 84% by weight and a temperature of 120 to 170 DEG C.
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公开(公告)号：DE4024240A1
公开(公告)日：1992-02-06
申请号：DE4024240
申请日：1990-07-31
Applicant: HOECHST AG
Inventor： STAFFEL THOMAS DR , ADRIAN RENATE DIPL ING , BECKER WOLFGANG DIPL ING
IPC: C01B25/40
Abstract: To produce essentially water-insoluble, chain-form ammonium polyphosphate from equimolar amounts of diammonium phosphate and phosphorus pentoxide in the presence of ammonia at temperatures of 170 to 350 DEG C with continuous mixing, kneading and comminution, diammonium phosphate and phosphorus pentoxide are at least partly replaced by partially ammoniated polyphosphoric acid. An installation for carrying out this process can be composed of a sealed reactor (1), which is provided with metering devices (2,3) and feed tubes (4,5) for phosphorus pentoxide and diammonium orthophosphate, an ammonia feed tube (8), an ammonium polyphosphate discharge tube (9) and also with a pipe for waste gas. In the interior of the reactor (1), rotatable mixing, kneading and comminution tools are mounted. Furthermore, a heatable stirrer container (11), into which polyphosphoric acid can be passed via a feed pipe (13), is provided, with the aid of which steam and ammonia can be eliminated from the waste gas flowing to the reactor (1) via the pipe (20) and from which partially ammoniated polyphosphoric acid may be introduced into the reactor (1) via an outlet pipe (17).
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公开(公告)号：DE4318242A1
公开(公告)日：1994-12-08
申请号：DE4318242
申请日：1993-06-02
Applicant: HOECHST AG
Abstract: The present invention relates to a process for preparing a crystalline sodium sheet (layer) silicate having a kanemite structure of the chemical formula NaH Si2O5 . X H2O where X has a value between 1 and 3, which is characterised in that sodium disilicate, silica and water are mixed in a molar ratio of 1:2:(6-8) and are held at a temperature of from 20 to 100@C for a period of from 0.2 to 10 hours.
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公开(公告)号：DE3705845A1
公开(公告)日：1988-09-01
申请号：DE3705845
申请日：1987-02-24
Applicant: HOECHST AG
Inventor： DANY FRANZ-JOSEF DIPL CHEM DR , KLASSEN HORST DIPL CHEM DR , ADRIAN RENATE DIPL ING , PRELL HEDWIG , KALTEYER GERHARD
Abstract: Toothpastes which contain, as a cleansing agent, a cleansing agent consisting essentially of dicalcium phosphate dihydrate having an adsorptivity of more than 60 g H2O/100 g of cleansing agent.
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