摘要:
A process for removing methacrolein from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrolein in the remaining mother liquor.
摘要:
A process for removing methacrylic acid from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrylic acid in the remaining mother liquor.
摘要:
A process for heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid, in which the starting reaction gas mixture comprises cyclopropane as an impurity and the acrylic acid, after conversion from the product gas mixture into the condensed phase, is removed with the aid of a crystallative removal.
摘要:
An apparatus for separating crystals from their suspension in contaminated crystal melt with purification, in which a hydraulic wash column has distributor aids in a distributor space.
摘要:
A process for operating a hydraulic wash column, in which the position of the buildup front in the wash column is positioned by means of the flow rates of control liquor conducted into the wash column and/or by means of the flow rate of the suspension conducted into the wash column, and the flow rate determination is with the aid of the pressure difference which exists in the column between points in the suspension zone disposed upstream of the buildup front and points in the zone projecting from the buildup front up to the end of the crystal bed.
摘要:
A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted to a liquid phase, constituents having a lower boiling point than benzoic acid and acrylic acid are removed therefrom by thermal separating processes, and the acrylic acid is removed by crystallization from the remaining liquid phase.
摘要:
A method for the heterogeneously catalyzed partial direct oxidation of propane to acrylic acid in the gas phase, in which the reaction gas inlet mixture comprises cyclopropane as an impurity and the acrylic acid, after it has been converted from the product gas mixture into the liquid phase, is operated from the other constituents of the liquid phase with the aid of a separation by crystallization.
摘要:
The present invention relates to a process for the preparation of solid acylphosphine oxides by converting an acylphosphine oxide which is in the form of a melt or in dispersed form into the solid state of aggregation with mechanical stress, shearing/internal agitation of the melt.
摘要:
A process for separating a liquid eutectic mixture by crystallization of one eutectic forming substance of the mixture on a cold surface to which seed crystals of the eutectic forming substance have been applied in the form of a seed crystal layer, and subsequent removal of the eutectic forming substance in liquid form after heating of the surface.
摘要:
A process for transporting a liquid monomer phase which has been withdrawn from a storage vessel and comprises methacrylic monomers to an extent of ≧90% by weight, in a tank truck or in a tanker ship, in which the liquid monomer phase is subjected to a separating operation on the route from the storage vessel into the tank of a tank truck or of a tanker ship in order to separate polymer of the monomer present in dissolved form in the liquid monomer phase.