DE2031842A1 - Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium - Google Patents

Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium

Info

Publication number
DE2031842A1
DE2031842A1 DE19702031842 DE2031842A DE2031842A1 DE 2031842 A1 DE2031842 A1 DE 2031842A1 DE 19702031842 DE19702031842 DE 19702031842 DE 2031842 A DE2031842 A DE 2031842A DE 2031842 A1 DE2031842 A1 DE 2031842A1
Authority
DE
Germany
Prior art keywords
dispersion
coarse fraction
filtering
solid dispersions
filter
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.)
Pending
Application number
DE19702031842
Other languages
German (de)
Inventor
Hans-Heinz Dr. 5090 Leverkusen; Hörnle Reinhold Dr.; Raab Hans Dr.; Adrio Joachim Dr. 5000 Köln Mölls
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.)
Bayer AG
Original Assignee
Bayer 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 Bayer AG filed Critical Bayer AG
Priority to DE19702031842 priority Critical patent/DE2031842A1/en
Publication of DE2031842A1 publication Critical patent/DE2031842A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered

Abstract

A continuous filtration process for solid dispersions, e.g. in production of dyestuffs, pharmaceuticals, uses the coarse fraction from the dispersion, which has been continuously separated in an earlier stage, as the auxiliary filtering layer, laid over a permeable support. Specifically, the fraction >5 mu m may be separated by centrifuging for this purpose. The advantage is that impurities are not removed with the filter cake.

Description

Verfahren zum kontinuierlichen Filtrieren von Pest stnffd fsgers ioaen Die vorliegende Erfindung richtet sich auf ein Verfahren zum kontinuierlichen Filtrieren von Feststoffdispersionen, wobei auf eine durchlässige Trägerfolie eine Filterhilfsschieht aufgebracht wird und darauf die Feststoffdispersion aufgegeben wird und wobei nach dem Filtrieren der FiLterkuchen mit mindestens einem Teil der Filterhilfsschicht kontinuierlich abgenommen wird. Process for continuous filtration of Pest stnffd fsgers ioaen The present invention is directed to a process for continuous Filtration of solid dispersions, with a Filter aid sheet is applied and the solid dispersion is applied to it is and wherein after filtering the filter cake with at least part of the Filter aid layer is continuously removed.

Es ist bekannt, beispielsweise auf mit Filtertüchern bespannte Drehtrommelfilter eine Filterhilfsschicht aus Kohle, Kalk, Kieselgur usw. aufzubringen und damit Dispersionen zu filtrieren, die einen hohen Feinanteil an Feststoff enthalten.It is known, for example, on rotary drum filters covered with filter cloths to apply a filter aid layer made of coal, lime, diatomaceous earth, etc. and thus dispersions to filter, which contain a high proportion of fine solids.

Der Nachteil dieses Verfahrens besteht darin, daß fttr bestimmte Anwendungszvocke, bei denen der Filterkuchen die gewünschte Substanz enthält, wie z.B. bei der Gewinnung von Farbstoffen, Pharmazeutika, Pflanzenschutzmitteln, usw., die Verunreinigung durch das Bilterhilfsscllichtmaterial unerwünscht ist, so daß die Verwendung einer solchen Filterhilfsschicht ausscheidet.The disadvantage of this method is that for certain application in which the filter cake contains the desired substance, e.g. in extraction of dyes, pharmaceuticals, pesticides, etc., the contamination is undesirable by the bilter auxiliary light material, so that the use of a such filter aid layer precipitates.

Es wurde nun überraschenderweise gefunden daß sich feine Anteile enthaltende Feststoffdispersionen ohne Verunreinigung kontinuierlich mit auareichendem Äbscheidegrad filtrieren lassen, indem erfindungsgemäß vor dem Filtrieren der Grobanteil der zu filtrierenden Feststoffdispersion kontinuierlich aus der Feststoffdispersion abgeschieden wird und als Filterhilfsschicht verwendet wird während die restlche, den Feinanteil enthaltende Dispersion zur Filtrat ion auf diese Filterhilfsschicht aufgebracht wird.It has now surprisingly been found that fine fractions are contained Solid dispersions without contamination continuously with a high degree of separation let filter by, according to the invention, the coarse fraction before filtering the solid dispersion to be filtered continuously from the solid dispersion is deposited and used as a filter aid layer while the rest of the The dispersion containing the fine fraction for filtration on this filter aid layer is applied.

Es war überraschend, daß auf diase Weise eine Filtrierung möglich ist, denn man mußte erwarten, daß sich in der aus dem Grobanteil bestehenden Filterhilfsschicht Brücken bilden, die eine zu hohe Porosität dieser Filterhilfsschicht bewirken wurden.It was surprising that filtration was possible in this way is, because one had to expect that in the filter aid layer consisting of the coarse fraction Form bridges that would cause this filter aid layer to have too high a porosity.

Vorzugsweise wird der über 5 juni liegende Grobanteil auszentrifugiert. Dies geschieht beispielsweise mit einer Dekanter-Schälzentrifuge oder einer Siebzentrifuge.The coarse fraction above June 5 is preferably centrifuged out. This is done, for example, with a decanter peeler centrifuge or a sieve centrifuge.

Bei Feststoffen mit einer Dichte über 5 g/cm3 kann der abgeschiedene Grobanteil herab bis- zu einer Teilchengröße von 5 µm erhalten werden, bei den üblichen Dichten von 1,5 - 2 g/cm² wie sie organische Feststoffe aufweisen, ist der Grobanteil in einer Große herab bis zu 10 µm zu gewinnen.In the case of solids with a density above 5 g / cm3, the separated Coarse fraction down to a particle size of 5 microns can be obtained, with the usual The coarse fraction is densities of 1.5 - 2 g / cm² as found in organic solids in a size down to 10 µm.

Die notwendige Dicke der Filterhilfsschicht ist für siede Feststoffdispersion unterschiedlich und muß in der Regel empirisch ermittelt werden.The necessary thickness of the filter aid layer is for the solid dispersion varies and must usually be determined empirically.

Claims (2)

Patentansrüche:Patent Claims: 1. @ Verfahren zum kontinuierlichen Filtrieren von Feststoffdispersionen, wobei auf eine durchlässige Trägerfläche eine Filterhslfsschicht aufgebracht wird und darauf die 1?eststoffdispersion aufgegeben wird, und wobei mach dem Filtrieren der Filterkuchen mit mindestens einem Teil der Filterhilfsschicht abgenommen wird, dadurch gekennzeichnet, daß vor dem Filtrieren der Grobanteil der zu filtrierenden Feststoffdispersion kontinuierlich aus der Feststoffdispersion abgeschieden wird und als FiJter'tilfsschicht verwendet wird, während die restliche, den Feinanteil enthaltende Dispersion zur Filtration auf die3e Filterhilfsschicht aufgebracht wird.1. @ Process for the continuous filtration of solid dispersions, wherein a filter support layer is applied to a permeable carrier surface and then the 1? eststoffdispersion is applied, and doing the filtration the filter cake is removed with at least part of the filter aid layer, characterized in that the coarse fraction of the to be filtered before the filtration Solid dispersion is continuously separated from the solid dispersion and is used as an auxiliary filter layer, while the remainder is the fine fraction containing dispersion is applied to the filter aid layer for filtration. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß der über 5 µm liegende. Grobanteil auszentrifugiert wird.2. The method according to claim i, characterized in that the over 5 µm lying. Coarse fraction is centrifuged out.
DE19702031842 1970-06-26 1970-06-26 Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium Pending DE2031842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19702031842 DE2031842A1 (en) 1970-06-26 1970-06-26 Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702031842 DE2031842A1 (en) 1970-06-26 1970-06-26 Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium

Publications (1)

Publication Number Publication Date
DE2031842A1 true DE2031842A1 (en) 1972-01-13

Family

ID=5775125

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702031842 Pending DE2031842A1 (en) 1970-06-26 1970-06-26 Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium

Country Status (1)

Country Link
DE (1) DE2031842A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431319A1 (en) * 1978-07-17 1980-02-15 Weiss Geb Kg AUXILIARY FILTERING AGENT FOR THE TREATMENT OF TROUBLE WATER AND SUSPENSIONS AND METHOD FOR DEHYDRATION OF SUCH TROUBLE WATER AND SUSPENSIONS USING THE SAME
FR2744035A1 (en) * 1996-01-29 1997-08-01 Schaeffer Engineering Entrepri Purification of waste water from textile processes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2431319A1 (en) * 1978-07-17 1980-02-15 Weiss Geb Kg AUXILIARY FILTERING AGENT FOR THE TREATMENT OF TROUBLE WATER AND SUSPENSIONS AND METHOD FOR DEHYDRATION OF SUCH TROUBLE WATER AND SUSPENSIONS USING THE SAME
FR2744035A1 (en) * 1996-01-29 1997-08-01 Schaeffer Engineering Entrepri Purification of waste water from textile processes

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