Abstract:
The invention relates to a method and a device for mixing a liquid in a substantially sealed container or a mixture of a liquid and a fine-particle solid, said liquid or mixture only partially filling the internal volume of the container that can be occupied by a fluidic phase and the remaining available internal volume of the container being filled by a gaseous phase. According to the invention, the essentially same liquid or mixture is fed to the container in the form of a propelled stream of a suction device that is situated in the liquid or mixture in the container. In its simplest form, the method according to the invention is implemented by means of an ejector (i.e. according to water jet pump principles) embodied as the suction device. The propelled stream is pumped through a propelling nozzle, which is fitted into the ejector in such a way that gas is sucked from the gaseous phase during the passage of the stream through the nozzle, e.g. by means of a riser tube that projects into the gaseous phase of the container, and is released in the form of dispersed gas bubbles, together with the propelled stream, into the liquid content of the storage container.
Abstract:
The invention relates to a method for producing water-absorbent resins, wherein a) acrylic acid is produced at an acrylic acid production site, b) the produced acrylic acid is dissolved in water at the acrylic acid production site, thus an aqueous acrylic acid solution is obtained, c) the acrylic acid solution is fed into a pipeline at the acrylic acid production site and is transported through the pipeline to an acrylic acid processing site d) the aqueous acrylic acid solution undergoes a radical polymerization at the acrylic acid processing site. Said method guarantees a save transport of the highly reactive acrylic acid. A threat caused by early polymerization, as with pure acrylic acid, is not possible, as the acrylic acid is 'diluted' due to the aqueous solvent and the specific thermal capacity or the evaporation enthalpy of the water limit the maximum temperature increase. The amount of polymerization inhibitors can be reduced or no polymerization inhibitors have to be used at all. Temperature control of containers, pipe conduits and pipelines, carrying the aqueous acrylic acid solution is not necessary, as the solidification point of the aqueous acrylic acid solution is lower than the one of the anhydrous acrylic acid.
Abstract:
Disclosed is a method for the rectifying separation of fluids containing (meth)acryl monomers in a rectifying column which comprises at least one sieve tray without a draining segment, the perforations of the sieve tray being arranged in a regular manner.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Aufreinigung von Cyclohexanpolycarbonsäureestern. Das Verfahren kann kontinuierlich oder batchweise durchgeführt werden.
Abstract:
The invention relates to a column (1) for the thermal treatment of a fluid, comprising: a cylindrical, vertically oriented column body (2) forming a column hollow chamber (3); and a material exchange base (4) arranged in the column hollow chamber (3), forming a collecting surface (5). The column (1) according to the invention is characterised by a circulation device (9) comprising: at least one outlet opening (10) formed in the column body (2) above the collecting surface (5); a circulation line (11) in fluid connection with the outlet opening (10); and at least one recirculation opening (14; 14-1 to 14-3) which is in fluid connection with the circulation line (11), and which is formed in the column body (2) above the collection surface (5). The invention also relates to a thermal separation method, wherein a column (1) of this type is used. With this separation method, a gas rises in the column and a liquid falls in the column, wherein the gas and/or the liquid contains in particular (meth)acrylmonomers.