Abstract: The invention relates to civil engineering underground equipment comprising at least one work element for ground work, at least two actuation units, at least one measuring device for determining at least one current actuation parameter for each actuation unit, and a controller which is designed for controlling the actuation units, wherein the controller is connected to the measuring devices and, in order to prevent a tipping of the civil engineering underground equipment, is designed to limit a further actuation of the actuation unit or to display to an operator that the limit actuation parameter has been reached and/or the limit actuation parameter, on the basis of previously calculated limit actuation parameters for the actuation units which define exactly one permissible operating range, when a limit actuation parameter of at least one actuation unit is reached.

Abstract: The invention relates to a safety means for a construction machine having a carrier unit and an actuation unit, which is adjustable with respect to the carrier unit, comprising at least one detecting means for detecting the current position of the actuation unit relative to the carrier unit, an indication means with which the current position of the actuation unit relative to the carrier unit can be indicated, and an evaluation unit, by means of which, depending on at least one input value, at least one adjustment range of the actuation unit can be determined, in which the actuation unit is adjustable at a given safety against tilting of the construction machine, whereby the adjustment range can be indicated together with the current position of the actuation unit by means of the indication means.

Abstract: The invention relates to a construction machine having a carrier unit, an actuation unit, which is adjustable with respect to the carrier unit, at least one detecting means for detecting status data of the construction machine, and a computer unit, by means of which, based on the detected status data, at least one adjustment range of the actuation unit can be determined, in which the actuation unit is adjustable at a given safety against tilting of the construction machine. The invention also relates to a method for operating a construction machine of such type.

Abstract: A method for separating electrolyte-containing water from an organic phase by means of permeation on a hydrophobic separating means. The permeated organic solution is substantially depleted in water and the retained water is enriched with electrolytes.

Abstract: The invention relates to a construction machine having a carrier unit, an actuation unit, which is adjustable with respect to the carrier unit, at least one detecting means for detecting status data of the construction machine, and a computer unit, by means of which, based on the detected status data, at least one adjustment range of the actuation unit can be determined, in which the actuation unit is adjustable at a given safety against tilting of the construction machine. The invention also relates to a method for operating a construction machine of such type.

Abstract: The invention relates to a safety means for a construction machine having a carrier unit and an actuation unit, which is adjustable with respect to the carrier unit, comprising at least one detecting means for detecting the current position of the actuation unit relative to the carrier unit, an indication means with which the current position of the actuation unit relative to the carrier unit can be indicated, and an evaluation unit, by means of which, depending on at least one input value, at least one adjustment range of the actuation unit can be determined, in which the actuation unit is adjustable at a given safety against tilting of the construction machine, whereby the adjustment range can be indicated together with the current position of the actuation unit by means of the indication means.

Abstract: The application relates to a process for the continuous production of phosgene from chlorine and CO with reduction of the carbon monoxide emission (CO emission).

Abstract: A method for separating electrolyte-containing water from an organic phase by means of permeation on a hydrophobic separating means. The permeated organic solution is substantially depleted in water and the retained water is enriched with electrolytes.

Abstract: An apparatus for degassing plastic materials, e.g., high molecular weight polycarbonate solutions, is described. The apparatus includes a double-shaft extruder having a length-to-diameter ratio of less than or equal to 40, which comprises: (i) two co-rotating and meshing shafts; (ii) an intake opening; and (iii) upstream and downstream portions relative to the intake opening. The shafts of the extruder are designed with a double lead in a degassing zone, and with a triple lead in a pressure build-up zone. Each of the degassing and the pressure build-up zones are down-stream from the intake opening, and the pressure build-up zone is further down-stream than the degassing zone. Also described is a process for degassing plastic materials, which involves providing the described double-shaft co-rotating extruder, into which plastic material is fed, processed and degassed.

Abstract: A strand devolatilizer that includes a degassing container, a product inlet, a product distributor, a product outlet and a vapor outlet is disclosed. The product distributor is in the form of a tube distributor with at least one distributor tube (1) and a plurality of die tubes (2) arranged in parallel, each containing a plurality of apertures (15) in the tube wall. The die tubes (2) are preferably arranged in several planes one above the other and staggered laterally relative to one another.

Abstract: A process for producing polymer pellets is disclosed. The process that is particular suitable for making polycarbonate pellets entails extruding a polymer melt, cooling the extrudate by contacting it with a cooling fluid and pelletizing the solidified polymer. The process is characterized in that the cooling fluid has a solids particle content of at most 10 ppm.

Abstract: A device and process for the removal of volatile constituents from polymers is disclosed. The device entails a container having an inlet for a polymer solution, an outlet for the volatile components, an outflow for the polymer from which the volatile components have been removed and a heat exchanger. The heat exchanger is characterized in that it contains a plurality of specially structured channels.

Abstract: The present invention provides a polycarbonate having a low particle content, a process for producing high-purity polycarbonate and polycarbonate of maximum purity and molded products made from such polycarbonate.

Abstract: A process for preparing a vacuole-free polymer is disclosed. Extruded polymer resin is cooled at a rate of less than 50° C./sec. to a temperature that is 1 to 20° C. above the glass transition temperature of the polymer resin and the resin is then cut.

Abstract: Described is a multi-stage, continuous process for evaporating and concentrating feed polymer solutions. In a first stage (a) of the process, the feed polymer solution is concentrated by passing it through one of (i) a combination of a tubular heat exchanger with one of a thin-film evaporator and a coiled tube evaporator, and (ii) a tubular heat exchanger. Each evaporator of (i) having a downstream separator. In a further stage (b), the intermediate polymer solution of the first stage is further concentrated and degassed to form a product polymer in a tubular heat exchanger having a downstream separator. The tubular heat exchanger of the further stage has an inside diameter of from 5 to 30 mm, and a length of from 0.5 to 4 m, and the throughput per heat exchanger tube being from 5 to 30 kg/h, based on the polymer. An entrainer is introduced into a delivery device located downstream from the separator of further stage (b).

Abstract: This invention relates to a multistep process for evaporating polymer solutions of thermoplastic polymers and for removing volatile constituents from thermoplastic polymers by indirect heat exchange. The invention relates in particular to a process for evaporating volatile constituents out of polymer solutions using shell-and-tube heat exchangers having a special geometry, coiled-tube evaporators and extrusion evaporators.

Abstract: A process of evaporating a viscous polymer solution is described. The process includes: (a) providing a viscous polymer solution including at least 30 wt. % of solvents and monomers; (b) introducing the viscous polymer solution into a heated helix (5), the heated helix having a vapor exit velocity of 200 to 300 m/s, (a film flow including a two-phase mixture of polymer melt, and solvent vapors and monomer vapors being formed within the helix); (c) forwarding the film flow from helix (5) into a heated vapor separator (6); (d) expanding the two-phase mixture of polymer melt, and solvent vapors and monomer vapors of the film flow within vapor separator (6) at an absolute pressure of 10 mbar to 800 mbar, (a bottom product including a concentrated melt of the polymer is formed within the vapor separator); and (e) withdrawing the bottom product from vapor separator (6).

Abstract: A method for removing volatile components from polymer solutions is disclosed. The method, yielding products having low content of residual volatile components and causing no thermal damage to the polymer, entails using apparatuses in which surfaces which come into contact with the product are made from materials which are low in iron content.

Abstract: A process for making a shaped product from thermoplastic polycarbonate is disclosed. The process comprises producing polycarbonate melt by a method selected from the group consisting of phase interface and melt transesterification and introducing the melt directly into a forming apparatus to form a shaped product. The forming apparatus is selected from the group consisting of an injection molding machine and an extruder. The process is characterized in the absence therefrom of polycarbonate in granular form.

Abstract: Thermoplastically processable thermotropic molding compounds of thermotropic polycondensates and 0.05 to 5% by weight functionalized polymers, such as for example functionalized polybutadiene oils, polyethylene or polypropylene.