摘要:
A chimney tray for a column for the thermal treatment of a liquid, comprising an upper tray and a lower tray which are spaced apart from one another, arranged substantially horizontally in the column, comprising chimneys, and also comprising drawing of the liquid via a drainage spout arranged at the edge of the chimney tray, wherein the upper tray and the lower tray have a minimum separation from one another of from 10 to 500 mm and, between the upper tray and the lower tray, a gas having a thermal conductivity of less than 0.5 watt/m/K has been incorporated.
摘要:
A process for covering the demand for polymers I in a country I, in which the monomers of the polymer I are obtained in at least one country II, then these monomers are polymerized free-radically to polymer I in this country II, and polymer I thus obtained is subsequently exported to a country I.
摘要:
A process for starting-up a heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid or of methacrolein to methacrylic acid over a fixed catalyst bed disposed in a tube bundle reactor cooled by a heat exchange medium, wherein the temperature of the heat exchange medium is ≧290° C. and the temperature of that reactor plate surface which faces the reaction gas entry mixture and the temperature of the reaction gas entry mixture itself are ≦285° C.