Development of new technical processes based on urtsaturated hydrocarbons Chemische Werke Huels A.G. has developed, in the past few years, several new technical processes, based on unsaturated hydrocarbons obtained from C4 cuts, to the point where they can be used in production. Inasmuch as large supplies of C4 cuts are expected to be readily available in the near future, we shall have access to relatively inexpensive raw materials for our processes (Figure 1).
Polyamide 12From butadiene, the starting material, we proceed by means of trimerization, using a Ziegler-Natta catalyst, to cyclododecatriene, which is subsequently hydrogenated into cyclododecane. Cyclodecanone is then formed through air oxidation in the presence of boric acid, and its oxime is rearranged into lauryl lactam. The polyamide 12 obtained from lauryl lactam possesses a carbon chain which is six carbon atoms longer than nylon 6. This is the reason why polyamide 12 has a much lower water absorption capacity and, besides other areas of application, is consequently used with preference for precision parts in valves. Its use for powder coating by the fluidization dip and electrostatic technique should also be mentioned.
ZUSAMMENFASSUNG:Die Polymerisation von besonders gereinigtem Acrolein mit verschiedenen anionischen Katalysatoren sowie mit Borfluoridatherat wird beschrieben. Diese Polymerisate haben andere physikalische und chemische Eigenschaften als die mit Redoxsystemen gewonnenen Polyacroleine. Es wurden Polymere hergestellt, die nur etwa 2 M01-y~ Aldehydgrup pen enthalten, aber 70 M01-y~ Doppelbindungen. Durch spektroskopische und chemische Methoden konnte die Struktur dieser Polymeren weitgehend aufgeklart werden.
SUMMARY:The polymerization of carefully purified acrolein with different anionic initiators and with boron fluoride ethyl etherate is reported. The products have other physical and chemical properties than polyacroleins initiated with redox-systems. The polymers obtained have only ca. 2 mole-% aldehyde groups but 70 mole-% double bonds. The structure of these polymers was extensively elucidated by spectroscopic and chemical methods.
Anhand von bestehenden Anlagen werden folgende Verfahren diskutiert: 1) Umwandlung von Butadien in Polyamid 12 (3000 Jato) über die Stufen Cyclododecatrien (Ziegler‐Katalysator), Cyclododecan, Cyclododecanon, Oxim, Lauryllactam.
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