This invention relates to a polymerization process for forming polymer comprising: contacting (typically in a solution or slurry phase), a monomer and a catalyst system in a reaction zone comprising at least one spiral heat exchanger and recovering polymer, wherein the monomer, the catalyst system and the polymer flow through the at least one spiral heat exchanger in a cross-flow direction relative to spirals of the at least one spiral heat exchanger.

A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution, comprising monomers bearing acid groups, in a gas phase surrounding the droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 m.

The invention provides a method for making a fluoropolymer and a method for preparing a fluorinated surfactant.

A dispersion stabilizer in the present invention contains an aqueous emulsion (a) obtained by dispersing a polymer (A) having an ethylenically unsaturated monomer unit in an aqueous medium, a PVA (B) having a degree of saponification of 65 mol % or more and less than 82 mol % and a viscosity-average degree of polymerization of 250 or more and less than 1500, and a PVA (C) having a degree of saponification of 82 mol % or more and less than 98 mol % and a viscosity-average degree of polymerization of 1500 or more and less than 4000. The dispersion stabilizer contains: 7 to 51 mass % of the polymer (A); 40 to 84 mass % of the PVA (B); and 9 to 53 mass % of the PVA (C), with respect to a total amount of the polymer (A), the PVA (B), and the PVA (C). A vinyl resin satisfying required performance can be obtained using the dispersion stabilizer.

This invention relates to a polymerization process for forming polymer comprising: contacting (typically in a solution or slurry phase), a monomer and a catalyst system in a reaction zone comprising at least one spiral heat exchanger and recovering polymer, wherein the monomer, the catalyst system and the polymer flow through the at least one spiral heat exchanger in a cross-flow direction relative to spirals of the at least one spiral heat exchanger.

A production method for degrading cocoa shell into polysaccharide for grafting onto polymer includes: preparing anaerobic thermophilic lignin-decomposing bacteria and cocoa shell powder; adding the cocoa shell powder into a decomposing bacteria culture solution with anaerobic thermophilic lignin-decomposing bacteria to obtain a cocoa shell degradation aqueous solution; obtaining a degraded saccharide liquid from the cocoa shell degradation aqueous solution to undergo high temperature melting with sorbitol and citric acid so as to polymerize into a polysaccharide powder; then placing the polysaccharide powder, N-isopropylacrylamide (NIPAAm), and an initiator into a reaction vessel filled with ethanol to obtain a polysaccharide-grafted N-isopropylacrylamide (NIPAAm) powder; and finally, performing a blending process with a polymer to complete covalent bonding of the polysaccharide-grafted N-isopropylacrylamide (NIPAAm) powder and the polymer. In addition, a plastic masterbatch can then be made for drawing into yarns and weaving into fabrics.

Embodiments disclosed herein relate to a use of propane contained in a propylene feedstock for setting up impact copolymer polypropylene production in at least two polymerization zones comprising accumulating the propane in a first polymerization zone (2, 5) during a parallel operation mode of the first polymerization zone (2, 5) and a second polymerization zone (7, 10) producing respective propylene polymers. Embodiments disclosed herein also relate to a process and a system for setting up impact copolymer polypropylenes production.