DE487013C - Process for the production of condensation products - Google Patents

Process for the production of condensation products

Info

Publication number
DE487013C
DE487013C DEB122307A DEB0122307A DE487013C DE 487013 C DE487013 C DE 487013C DE B122307 A DEB122307 A DE B122307A DE B0122307 A DEB0122307 A DE B0122307A DE 487013 C DE487013 C DE 487013C
Authority
DE
Germany
Prior art keywords
condensation products
production
water
distillation
condensation
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.)
Expired
Application number
DEB122307A
Other languages
German (de)
Inventor
Dr Carl Mueller Von Blumeneron
Dr Robert Griessbach
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEB122307A priority Critical patent/DE487013C/en
Priority to GB25842/26A priority patent/GB260253A/en
Application granted granted Critical
Publication of DE487013C publication Critical patent/DE487013C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/06—Safety devices ; Regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
    • C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08G12/10—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with acyclic compounds having the moiety X=C(—N<)2 in which X is O, S or —N
    • C08G12/12—Ureas; Thioureas
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Description

Verfahren zur Herstellung von Kondensationsprodukten Bei der Herstellung von Kondensationsprodukten aus Harnstoff und Formaldehyd oder deren Derivaten ist es im allgemeinen erforderlich, während oder nach beendeter Kondensation das überschüssige Wasser abzudestillieren. Je nachdem man die Destillation später oder früher unterbricht, erhält man mehr oder weniger viskose Massen, deren Wassergehalt ihre Brauchbarkeit maßgebend beeinflußt. Bisher fehlte jedoch ein zuverlässiges Verfahren, denjenigen Punkt mit Sicherheit zu erkennen, bei dem die Abdestillation des Wassers am zweckmäßigsten unterbrochen wird. Viskositätsmessungen sind umständlich und wenig zuverlässig. Auch die Messung der übergehenden Destillatmenge ist beim Arbeiten in großem Maßstabe mit erheblichen Unsicherheiten verbunden.Process for the manufacture of condensation products During manufacture of condensation products of urea and formaldehyde or their derivatives it is generally necessary to remove the excess during or after the condensation has ended Distill off water. Depending on whether the distillation is interrupted later or earlier, more or less viscous masses are obtained, the water content of which makes them useful decisively influenced. So far, however, there has been no reliable method, those The point to be recognized with certainty at which the distillation of the water is most expedient is interrupted. Viscosity measurements are cumbersome and not very reliable. The measurement of the amount of distillate transferred is also a large-scale measure when working associated with considerable uncertainties.

Es wurde nun gefunden, daß die :Messung der spezifischen elektrischen Leitfähigkeit bzw. des spezifischen elektrischen Widerstandes der Lösung ein vorzügliches Mittel an die Hand gibt, den Fortschritt der Destillation zu verfolgen. Die Unsicherheiten, die den erwähnten Methoden anhaften, fallen fort, und es wird hierdurch erst möglich, die Konzentrierung des Kondensationsproduktes in stets gleichbleibender Weise zu leiten. Das Verfahren hat daneben den Vorteil, daß der Fortschritt des Destillationsvorganges auch räumlich entfernt von dem Arbeitsraum verfolgt werden kann.It has now been found that: Measurement of the specific electrical Conductivity or the specific electrical resistance of the solution an excellent one Means at hand to follow the progress of the distillation. The uncertainties that cling to the methods mentioned fall away, and it is only through this that it becomes possible the concentration of the condensation product in an always constant manner conduct. The process also has the advantage that the distillation process progresses can also be tracked remotely from the workspace.

Für die Messungen selbst erweist sich eine Tauchelektrode, die in die Mischung eingesenkt wird, als besonders geeignet.For the measurements themselves, a submerged electrode proves to be used in the mixture is lowered as particularly suitable.

Der spezifische Widerstand der einzudampfenden Lösung ist zwar je nach ihrer Herstellung verschieden, in jedem Falle jedoch steigt er, wenn das Ende der Destillation des Wassers erreicht wird, fast plötzlich sehr stark an, Man ist dadurch in der Lage, die Destillation bei einem beliebigen Punkt bzw. bestimmten Restwassergehalt in jedesmal sicher zu wiederholender Weise abzubrechen.The specific resistance of the solution to be evaporated is depending different according to their production, but in each case it increases when the end the distillation of the water is achieved, almost suddenly, very strongly at, one is thereby being able to stop the distillation at any point or particular To break off the residual water content in a manner that can be safely repeated each time.

Beispiel Eine durch Kondensation von Harnstoff und Formaldehyd (Molverhältnis i : 2,5, ph = 4,4) erhaltene Lösung zeigte beim Eindampfen (Druck 3o mm Hg, Temperatur etwa 301 folgende spezifische Widerstände, die in Abhängigkeit von der übergegangenen Destillatmenge angegeben sind, ausgedrückt in Prozenten der eingeführten Wassermenge (das bei der Kondensation selbst entstehende Wasser ist dabei nicht in Rechnung gesetzt) °@° Wasser: spez. Widerstand in Ohm: 12.7 462 28,0 500 43,0 540 52,0 770 66,o 930 76,o 1420 81,5 1850 84,0 2 850 86,5 4 oho 87,5 6 18o 89,5 7730 91,o 14500 °,l° Wasser: spez. Widerstand in Ohm 92,5 20000 9512 34500 96,o 39300 100,0 145000 Je nach dem Verwendungszweck des Endproduktes kann ein gewünschter Wassergehalt an Hand des spezifischen Widerstandes der Lösung festgestellt und bei dem geeigneten Punkte die Abdestillation unterbrochen werden.EXAMPLE A solution obtained by condensation of urea and formaldehyde (molar ratio i: 2.5, ph = 4.4) showed the following specific resistances on evaporation (pressure 30 mm Hg, temperature about 301 , which are given as a function of the amount of distillate passed over: expressed as a percentage of the amount of water introduced (the water produced during condensation is not included in the calculation) ° @ ° water: spec. Resistance in ohms: 12.7 462 28.0 500 43.0 540 52.0 770 66, o 930 76, o 1420 81.5 1850 84.0 2850 86.5 4 oho 87.5 6 18o 89.5 7730 91, o 14500 °, l ° water: spec. Resistance in ohms 92.5 20,000 9512 34500 96, o 39300 100.0 145000 Depending on the intended use of the end product, a desired water content can be determined on the basis of the specific resistance of the solution and the distillation can be interrupted at the appropriate point.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Kondensationsprodukten aus Harnstoff und Formaldehyd und deren Derivaten, dadurch gekennzeichnet, daß dabei die gewünschten Endpunkte des Eindampfens durch :Messung des elektrischenWiderstandes festgestelltwerden.PATENT CLAIM: Process for the production of condensation products of urea and formaldehyde and their derivatives, characterized in that the desired endpoints of evaporation by: measuring the electrical resistance to be determined.
DEB122307A 1925-10-21 1925-10-21 Process for the production of condensation products Expired DE487013C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEB122307A DE487013C (en) 1925-10-21 1925-10-21 Process for the production of condensation products
GB25842/26A GB260253A (en) 1925-10-21 1926-10-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB122307A DE487013C (en) 1925-10-21 1925-10-21 Process for the production of condensation products

Publications (1)

Publication Number Publication Date
DE487013C true DE487013C (en) 1929-11-30

Family

ID=80784042

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB122307A Expired DE487013C (en) 1925-10-21 1925-10-21 Process for the production of condensation products

Country Status (2)

Country Link
DE (1) DE487013C (en)
GB (1) GB260253A (en)

Also Published As

Publication number Publication date
GB260253A (en) 1928-01-16

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