Abstract: The invention provides circular processes using siloxanes as high-temperature heat transfer fluid (HTF), wherein the siloxanes go over from the state of the supercooled liquid into the state of the high-density supercritical fluid by means of heat uptake without a phase transition and energy is then transferred as energy without a phase transition.

Abstract: Silicone heat transfer fluids having a narrow range of M:D units and a specified proportion of cyclic siloxanes are able to be used at heat transfer fluids at high temperatures without reaching a supercritical state.

Abstract: The invention provides a process for removal of gaseous decomposition products from high temperature heat transfer fluid HTF of an operational solar thermal power plant having an HTF circuit, in which a volume increase of the HTF in the HTF circuit which is caused by incident solar radiation in an HTF-traversed solar field and consequent heating by day takes place regularly in a day-night cycle and the additional volume formed by the volume increase is collected from the HTF circuit in an expansion vessel, a portion of the additional volume of the HTF is transferred into a drainage vessel operated at relatively low pressure in which gaseous decomposition products and low-boiling constituents escape from the HTF, wherein the low-boiling constituents are condensed, and during the volume contraction of the HTF occurring during the night-time cooling a portion of the additional volume of the HTF is recycled from the drainage vessel into the expansion vessel and from the expansion vessel into the HTF circuit, w

Abstract: The invention provides circular processes using siloxanes as high-temperature heat transfer fluid (HTF), wherein the siloxanes go over from the state of the supercooled liquid into the state of the high-density supercritical fluid by means of heat uptake without a phase transition and energy is then transferred as energy without a phase transition.

Abstract: The invention provides a process for removal of gaseous decomposition products from high temperature heat transfer fluid HTF of an operational solar thermal power plant having an HTF circuit, in which a volume increase of the HTF in the HTF circuit which is caused by incident solar radiation in an HTF-traversed solar field and consequent heating by day takes place regularly in a day-night cycle and the additional volume formed by the volume increase is collected from the HTF circuit in an expansion vessel, a portion of the additional volume of the HTF is transferred into a drainage vessel operated at relatively low pressure in which gaseous decomposition products and low-boiling constituents escape from the HTF, wherein the low-boiling constituents are condensed, and during the volume contraction of the HTF occurring during the night-time cooling a portion of the additional volume of the HTF is recycled from the drainage vessel into the expansion vessel and from the expansion vessel into the HTF circuit, w

Abstract: Organopolysiloxane moldings are prepared from (A) compounds which have radicals having aliphatic carbon-carbon multiple bonds, (B) organopolysiloxanes having Si-bonded hydrogen atoms, and (D) a hydrosilylation catalyst, by a process involving first preparing an admixture of 100 parts by weight of (A) and (B) or (A) and (D), and then feeding, into the mixer of a plastics-processing machine, either from 0.3 to 5 parts by weight of (D), based on the catalyst formulation, into the mixture of (A) and (B), or from 0.3 to 5 parts by weight of (B) into the mixture of (A) and (D).

Abstract: A process of production of linear, water-soluble polymers and co-polymers of very high molecular weight in powder form, from monomers which are themselves soluble in water comprises operating in emulsion with an inversion of phase during the course of the operation with, as solvent, a hydrocarbon giving with water an azeotrope boiling at a temperature lower than 100.degree.C, and with, as emulsifying agent, a non-ionic emulsifying agent having a H.L.B between 8 and 13 in a proportion of 1.5 to 5 % of the total weight of the monomers and the solvents, initiating the polymerization at a temperature lower than 35.degree.C by adding the quantity of initiator of the Redox type to the whole of the reactants and especially carrying out the polymerization in a closed vessel without external cooling, until the maximum temperature is reached.