FR2444644A1 - PROCESS AND DEVICE FOR THE PRODUCTION OF SILICA GEL - Google Patents

PROCESS AND DEVICE FOR THE PRODUCTION OF SILICA GEL

Info

Publication number
FR2444644A1
FR2444644A1 FR7931222A FR7931222A FR2444644A1 FR 2444644 A1 FR2444644 A1 FR 2444644A1 FR 7931222 A FR7931222 A FR 7931222A FR 7931222 A FR7931222 A FR 7931222A FR 2444644 A1 FR2444644 A1 FR 2444644A1
Authority
FR
France
Prior art keywords
gel
silica gel
production
washing
desiccant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR7931222A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mittex AG
Original Assignee
Mittex AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mittex AG filed Critical Mittex AG
Publication of FR2444644A1 publication Critical patent/FR2444644A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/157—After-treatment of gels
    • C01B33/158—Purification; Drying; Dehydrating

Abstract

Ce procédé est du type à précipitation, gélification, lavage et séchage. Suivant l'invention il est caractérisé en ce que, lors du lavage, on porte l'hydrogel à un pH compris entre 1 et 3,5 et en ce qu'on décale ensuite ce pH vers le point neutre (pH = 7) par le séchage consécutif exécuté au moyen d'un agent desséchant qui traverse la couche de gel de haut en bas dans le sens allant du gel sec vers le gel humide, c'est-à-dire à contre-courant. L'invention s'applique notamment à la fabrication du gel de silice destiné à la récupération de l'eau atmosphérique dans les régions désertiques.This process is of the precipitation, gelation, washing and drying type. According to the invention, it is characterized in that, during washing, the hydrogel is brought to a pH of between 1 and 3.5 and in that this pH is then shifted towards the neutral point (pH = 7) by the subsequent drying carried out by means of a desiccant which crosses the gel layer from top to bottom in the direction going from the dry gel to the wet gel, that is to say against the current. The invention applies in particular to the manufacture of silica gel intended for the recovery of atmospheric water in desert regions.

FR7931222A 1978-12-21 1979-12-20 PROCESS AND DEVICE FOR THE PRODUCTION OF SILICA GEL Withdrawn FR2444644A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782855251 DE2855251A1 (en) 1978-12-21 1978-12-21 METHOD AND DEVICE FOR PRODUCING SILICONE GEL

Publications (1)

Publication Number Publication Date
FR2444644A1 true FR2444644A1 (en) 1980-07-18

Family

ID=6057875

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7931222A Withdrawn FR2444644A1 (en) 1978-12-21 1979-12-20 PROCESS AND DEVICE FOR THE PRODUCTION OF SILICA GEL

Country Status (5)

Country Link
JP (1) JPS5590414A (en)
DE (1) DE2855251A1 (en)
FR (1) FR2444644A1 (en)
GB (1) GB2043041B (en)
IT (1) IT1166038B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3689907B2 (en) 2001-04-27 2005-08-31 株式会社安中製作所 Method for forming curved surface of curved decorative board
JP4712879B2 (en) * 2009-02-19 2011-06-29 公立大学法人首都大学東京 Method for drying water-containing wet gel and apparatus for drying water-containing wet gel
DE102012202587A1 (en) * 2012-02-21 2013-08-22 Evonik Degussa Gmbh Process for producing high-purity SiO 2

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB263199A (en) * 1925-12-19 1928-03-20 Ig Farbenindustrie Ag An improved process for the production of active silica gels with fine capillary pores
US2389973A (en) * 1943-09-14 1945-11-27 Davison Chemical Corp Apparatus and method for washing gels
FR1537799A (en) * 1966-07-13 1968-08-30 Process and device for preparing silica gel and use of said silica gel for gas drying, for gas cleaning or for gas separation, as well as as a support for catalysts
DE2624392A1 (en) * 1975-06-04 1977-10-13 Mittex Anstalt Water recovery from the atmosphere - esp. in tropical climates, by adsorption during the night and desorption during the day using silica gel as adsorbent
FR2386650A1 (en) * 1977-04-04 1978-11-03 Mittex Anstalt Recovery of atmospheric moisture - by passing cooled night air through silica adsorbent and desorbing water with hot day time air

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626272C (en) * 1925-12-19 1936-02-22 I G Farbenindustrie Akt Ges Process for the production of active silica with narrow pores
BE709608A (en) * 1967-01-27 1968-05-30

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB263199A (en) * 1925-12-19 1928-03-20 Ig Farbenindustrie Ag An improved process for the production of active silica gels with fine capillary pores
US2389973A (en) * 1943-09-14 1945-11-27 Davison Chemical Corp Apparatus and method for washing gels
FR1537799A (en) * 1966-07-13 1968-08-30 Process and device for preparing silica gel and use of said silica gel for gas drying, for gas cleaning or for gas separation, as well as as a support for catalysts
DE2624392A1 (en) * 1975-06-04 1977-10-13 Mittex Anstalt Water recovery from the atmosphere - esp. in tropical climates, by adsorption during the night and desorption during the day using silica gel as adsorbent
FR2386650A1 (en) * 1977-04-04 1978-11-03 Mittex Anstalt Recovery of atmospheric moisture - by passing cooled night air through silica adsorbent and desorbing water with hot day time air

Also Published As

Publication number Publication date
JPS5590414A (en) 1980-07-09
IT7909623A0 (en) 1979-12-17
DE2855251A1 (en) 1980-07-03
IT1166038B (en) 1987-04-29
GB2043041A (en) 1980-10-01
GB2043041B (en) 1982-11-17

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Legal Events

Date Code Title Description
ST Notification of lapse