METHOD FOR CLEANING A POLYMERIZATION REACTOR

• Main Authors: WEITZEL HANS-PETER, BRAUNSPERGER ROBERT
• Format: Patent
• Language: Chinese; English
• Published: 09.02.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention relates to a method for cleaning a polymerization reactor for producing aqueous polymer dispersions by means of radical-initiated emulsion polymerization of one or more ethylenically unsaturated monomers in the presence of one or more protective colloids and/or emulsifiers, characterized in that: an aqueous mixture is placed in the polymerization reactor, which mixture contains one or more ethylenically unsaturated monomers and one or more protective colloids and/or emulsifiers, and does not contain an oxidation initiator, the proportion of the ethylenically unsaturated monomersbeing 20 to 70 wt.%, based on the total weight of the aqueous mixture; the aqueous mixture is then heated to a temperature of 50 DEG C to 100 DEG C and the polymerization reactor is treated for 5 minutes to 3 hours with the aqueous mixture; one or more initiators and optionally additional starting materials are then added; the polymerization is then initiated; and the aqueous polymer dispersion obtained thereby is removed