Hoechst Aktiengesellschaft

Zimmer Aktiengesellschaft

Lurgi Zimmer Aktiengesellschaft

Thomas Gries

Heinz-Dieter Beeck

Matthias Wolfgang Meyer

Frank Ebmeyer

Werner Mrose

Rainer Tietze

Hariolf Kottmann

Ralf Stapel

Michael Kress

Klaus-Dieter Ginzel

Richard Prehler

Andreas Mueller

A parallel spinning process, in particular for filaments, e.g. for textile or industrial applications, made from polymers such as, for example, PET or PA, in each case having a thread interlacing device between two godets for each individual thread, the godets being moved in relation to one another during the piercing or feeding operation in such a way that each individual thread is automatically threaded into its interlacing device associated therewith, and the angle of wrap in the operating mode is at least from 85&#xb0; to at most 200&#xb0;, preferably from 175&#xb0; to 185&#xb0;.

Parallel spinning process involving the intermingling of threads between galettes and a corresponding spinning installation therefor

The invention relates to a spinning device in which liquid polymer is guided through a polymer line with a first heating jacket to a spinning pump with a second heating jacket. From said spinning pump, the polymer is transported through several lines to spinning packets and extruded through spinnerts to form filaments. The lines that are connected downstream of the spinning pump, the spinning packets and the spinnerets are located in at least one spinning housing through which heating fluid flows. There is a distance of 5 mm between the spinning housing through which the heating fluid flows and the first and second heating jackets and the spinning pump, to obtain thermal decoupling. According to a method for heating the spinning device, vaporous heating fluid is guided out of a first reservoir into the spinning housing, and heating fluid is guided out of a second reservoir into the first and/or second heating jacket. The temperature of the heating fluid that is supplied to the spinning housing is 10 to 40&deg; C. higher than the temperature of the heating fluid that is supplied to the first and/or second heating jacket.

Spinning device for spinning molten polymers and method for heating the spinning device

The invention provides a process and device for the spinning of polyamides including transporting vapor through at least one round spinning nozzle casing (5) using an exhaust device (14, 15) that is positioned under at least one round spinning nozzle plate (10). In this process, the vapor is injected tangentially into the upper portion of the applicable spinning nozzle casing (5) and is conducted downward through at least one helical groove (7), which is arranged along the exterior of the applicable spinning nozzle unit (6). The vapor at the lower end of the spinning nozzle unit (6) is conducted against a circular, horizontally positioned groove (8), where it undergoes a change in the direction of flow toward the spinning nozzle plate (10). The vapor is then conducted to the spinning nozzle plate (10) over the inner edge (9) of the circular, horizontally positioned groove (8) and through a first annular passage (11) and, at the spinning nozzle plate (10), is suctioned off by the exhaust device (14, 15) through a second annular passage (12).

Process and device for transporting vapor through at least one round

The invention relates to a process for the recovery of perfluoroethercarboxylic acids from the crude product of the electrochemical conversion of these acids or of one of their soluble salts to perfluorinated ethers, in which the perfluoroethercarboxylic acids and their esters contained in the crude product are separated off with the aid of a solid basic alkali metal salt or its solution and converted, by reaction of the resulting salts with a strong acid, to the corresponding perfluoroethercarboxylic acids.

Process for the recovery of perfluoroethercarboxylic acids

The invention relates to a process for the preparation of fluorinated ethers of the formula (I)

Process for the preparation of perfluorinated ethers

The invention relates to a process for the stabilization and purification of perfluoropolyethers of the general formulae (I) or (II) ##STR1## in which R=--F or --C.sub.a F.sub.2a+1

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Frankfurt am Main, Germany

Thomas Gries