DE761131C - Process for the polymerization of isobutylene - Google Patents
Process for the polymerization of isobutyleneInfo
- Publication number
- DE761131C DE761131C DEI70751D DEI0070751D DE761131C DE 761131 C DE761131 C DE 761131C DE I70751 D DEI70751 D DE I70751D DE I0070751 D DEI0070751 D DE I0070751D DE 761131 C DE761131 C DE 761131C
- Authority
- DE
- Germany
- Prior art keywords
- polymerization
- isobutylene
- catalysts
- reaction
- reaction time
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/04—Monomers containing three or four carbon atoms
- C08F210/08—Butenes
- C08F210/10—Isobutene
- C08F210/12—Isobutene with conjugated diolefins, e.g. butyl rubber
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerization Catalysts (AREA)
Description
Im Patent 704 038 ist gezeigt, daß die Polymerisation von Isobutylen mit Hilfe von Katalysatoren der Friedel-Craftsschen Reaktion, vor- ' zugsweise Borfluorid, bei Temperaturen unterhalb — io° besonders günstig verläuft, wenn man in Gegenwart geringer Mengen einwertiger Alkohole arbeitet. Diese Zusatzstoffe wirken als Beschleuniger der Reaktion, da bei ihrer Anwesenheit die Reaktionszeit erheblich verkürzt und die Menge des zur Polymerisation benötigten Katalysators herabgesetzt wird. Gleichzeitig wird dabei in der Regel "das Molekulargewicht der Polymerisate unter sonst gleichen Bedingungen wesentlich erhöht.In patent 704 038 it is shown that the polymerization of isobutylene with the aid of catalysts the Friedel-Crafts reaction, preferably 'boron fluoride, at temperatures below - io ° proceeds particularly favorably if one is monovalent in the presence of small amounts Alcohols works. These additives act as accelerators of the reaction because of their Presence significantly shortens the reaction time and the amount of polymerization required catalyst is reduced. At the same time, as a rule, “the molecular weight the polymerizate increased significantly under otherwise identical conditions.
Es wurde nun gefunden, daß diese günstige Wirkung auf den Verlauf der Polymerisation nicht auf die einwertigen Alkohole beschränkt ist, sondern daß man ähnliche Ergebnisse auch mit geringen Mengen Schwefelsäure oder Salpetersäure erhält. In der Regel werden Mengen von 0,5 °/0 nicht überschritten, doch genügt vielfach auch schon wesentlich weniger. Durch den genannten Zusatz wird die Reaktionszeit erheblich verkürzt und die notwendige Katalysatormenge herabgesetzt. Gleichzeitig tritt in manchen Fällen eine Steigerung des Molekulargewichts der erhaltenen Produkte ein.It has now been found that this beneficial effect on the course of the polymerization is not limited to the monohydric alcohols, but that similar results are obtained even with small amounts of sulfuric acid or nitric acid. Usually amounts of 0.5 ° / 0 not exceeded, but sufficient in many cases even much less. The addition mentioned shortens the reaction time considerably and reduces the amount of catalyst required. At the same time, in some cases there is an increase in the molecular weight of the products obtained.
Es ist bekannt, die Polymerisation von Iso-It is known that the polymerization of iso-
butylen mit Hilfe von Katalysatoren der Friedel-Craftsschen Reaktion in Gegenwart von Stoffen durchzuführen, die die Katalysatoren in gewissem Maße vergiften. Als solche Stoffe kommen z. B. Schwefelverbindungen, Alkylhalogenide und auch Halogenwasserstoffe, wie Chlor- oder Fluorwasserstoff, in Frage. Die nach der vorliegenden Erfindung verwendeten Säuren unterscheiden sich von diesen Stoffen sowohl durch ihren Sauerstoffgehalt als auch vor allem durch ihre ganz andersartige Wirkung, da sie die Katalysatoren nicht vergiften, sondern im Gegenteil die Reaktion sogar beschleunigen, also die Wirkung der Katalysatoren steigern.butylene using catalysts of the Friedel-Crafts reaction in the presence of Carry out substances that poison the catalysts to some extent. As such substances come z. B. sulfur compounds, alkyl halides and hydrogen halides, such as Hydrogen chloride or hydrogen fluoride. Those used in the present invention Acids differ from these substances in terms of their oxygen content as well above all because of their completely different effect, as they do not poison the catalysts, but on the contrary, even accelerate the reaction, i.e. increase the effectiveness of the catalysts.
20 Raumteile eines gut gereinigten flüssigen Isobutylens werden mit 40 bis 60 Raumteilen flüssigem Äthylen gemischt und bei einer Temperatur von —103" mittels 30 Raumteilen gasförmigen Borfluorids in Gegenwart von 0,15 °,.'o reiner 94%iger Schwefelsäure polymerisiert. Die Reaktionszeit beträgt 4 Sekunden.20 parts by volume of a well-cleaned liquid isobutylene are mixed with 40 to 60 parts by volume of liquid ethylene and at a temperature of -103 "by means of 30 parts by volume of gaseous boron fluoride in the presence of 0.15 °. ' o Pure 94% sulfuric acid polymerizes, the reaction time is 4 seconds.
Verwendet man in gleicher Weise 0,15Q 0 roher 65°/oiger Salpetersäure, so beträgt die Reaktionszeit 25 Sekunden.Using 65 ° / o nitric acid in the same manner crude 0.15 Q 0, the reaction time is 25 seconds.
Arbeitet man dagegen ohne Zusatzstoff, so beträgt die Reaktionszeit 70 Sekunden.If, on the other hand, you work without an additive, the reaction time is 70 seconds.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI70751D DE761131C (en) | 1938-05-24 | 1938-06-24 | Process for the polymerization of isobutylene |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1938I0061446 DE704038C (en) | 1938-05-24 | 1938-05-24 | |
| DEI70751D DE761131C (en) | 1938-05-24 | 1938-06-24 | Process for the polymerization of isobutylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE761131C true DE761131C (en) | 1954-08-02 |
Family
ID=33491356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI70751D Expired DE761131C (en) | 1938-05-24 | 1938-06-24 | Process for the polymerization of isobutylene |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE761131C (en) |
-
1938
- 1938-06-24 DE DEI70751D patent/DE761131C/en not_active Expired
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