Abstract: A process for purifying N-vinyl-&egr;-caprolactam comprises converting the N-vinyl-&egr;-caprolactam which is to be purified and has a purity of at least 95% by weight into a melt, partially crystallizing the melt and separating the crystals from the mother liquor.

Abstract: The invention provides an N-alkenyllactam having at least a 6-membered lactam ring, stabilized by phenothiazine and/or derivatives thereof, and a process for the stabilization of N-alkenyllactams.

Abstract: Alkenyl ethers are prepared by reacting the corresponding alcohols or phenols with acetylenes in the liquid phase in the presence of basic alkali metal compounds and a cocatalyst comprising compounds of the formula (Ia) and/or (Ib)

Abstract: A continuous processs for the preparation of O—, S— and N-alkenyl compounds by reaction of the corresponding OH, SH or NH compound with an acetylene in the liquid phase in the presence of basic alkali or alkaline earth metal compounds at from 40 to 300° C. and from 0.11 to 5 MPa absolute comprises continuously feeding the corresponding OH, SH or NH compound and the acetylene and operating at a conversion of the corresponding OH, SH or NH compound of ≧90%.

Abstract: A process for preparing N-alkenyl-amides by reacting the corresponding NH-amides with acetylenes in the liquid phase in the presence of basic alkali metal compounds and of a cocatalyst comprises using as the cocatalyst diols of the general formula (I) 1

Abstract: A process for preparing N-alkenyl-amides by reacting the corresponding NH-amides with acetylenes in the liquid phase in the presence of basic alkali metal compounds and of a cocatalyst comprises using as the cocatalyst compounds of the general formulae (Ia) and/or (Ib)

Abstract: A process for purifying N-vinyl-&egr;-caprolactam comprises converting the N-vinyl-&egr;-caprolactam which is to be purified and has a purity of at least 95% by weight into a melt, partially crystallizing the melt and separating the crystals from the mother liquor.

Abstract: A process is provided for stabilizing and/or lowering the color number of alkenyl compounds containing a divalent or trivalent heteroatom in the &agr;-position to the double bond, wherein an oxidizing agent is added to the alkenyl compounds.

Abstract: A method of storing and transporting N-vinyl-&egr;-caprolactam is provided wherein the N-vinyl-&egr;-caprolactam is kept in the liquid phase.

Abstract: A process for purifying alkenyl compounds having a divalent or trivalent heteroatom in the &agr;-position relative to the double bond by distillation comprises carrying out at least two distillations in which the purified alkenyl compounds are obtained from the gas phase by condensation, where the time between the first distillation after the synthesis of the alkenyl compounds and at least one further distillation is at least one day and the purified alkenyl compounds have an APHA color number of <30.

Abstract: A process for purifying alkenyl compounds having a divalent or trivalent heteroatom in the &agr;-position relative to the double bond by distillation comprises carrying out at least two distillations in which the purified alkenyl compounds are obtained from the gas phase by condensation, where the time between the first distillation after the synthesis of the alkenyl compounds and at least one further distillation is at least one day and the purified alkenyl compounds have an APHA color number of <30.

Abstract: The invention provides an N-alkenyllactam having at least a 6-membered lactam ring, stabilized by phenothiazine and/or derivatives thereof, and a process for the stabilization of N-alkenyllactams.

Abstract: The divinyl ethers of diethylene glycol or triethylene glycol are separated from the monovinyl ether of the corresponding oligoethylene glycol by distillation, a metal hydroxide being added to the vinyl ether mixture.

Abstract: A process for vinylation of an organic acidic-hydrogen compound, which entails reacting an organic acidic-hydrogen compound with acetylene or an acetylene-containing gas under elevated pressure and at elevated temperature in the presence of a base, wherein reactor regions initiating decomposition of acetylene are treated with an effective amount of a chemically inert oil of medium viscosity.

Abstract: A shaft with integrated angle compensating elements of fibre-reinforced material includes an elastically-deformable coupling flange which is curved backwards to form an annular portion which connects the flange to the inner wall of a surrounding disk-shaped connection element. The shaft comprises fibres cross-wound at an angle to the axis of the shaft which extend up to the free edge of the flange.

Abstract: A needle selector apparatus for a Jacquard machine has drop needles and thrust needles which are supported thereby and which are horizontally and vertically movable by way of control devices. A blocking element is associated with the end of each drop needle and can selectively provide support for the end of the drop needle or permit the drop needle to drop down. The adjusting element of each blocking element is a respective piezoelectric flexural transducer which is stationarily clamped at one end. Each transducer is arranged with its longitudinal direction transversely to the longitudinal direction of the associated drop needle. The free end of each transducer is movable between the support position of lying in the path of movement of the drop needle and the drop-down position of lying outside the path of movement of the drop needle, in a plane which is transverse to the longitudinal direction of the drop needle.