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US 6,867,262 B1Granted
Grafted polymers as gas hydrate inhibitors
AssigneeBASF SE
InventorsMaximilian Angel, Karin Neubecker, Axel Sanner
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Abstract
Graft polymers are used as gas hydrate inhibitors.
Claims16
A graft polymer comprising:
- a hydrophilic base polymer which is a polyalkylene glycol, a polyether or a polymer having at least one heteroatom in the main chain, with the proviso that polyphenylene ether is excluded as a base polymer, having a N-vinyllactam grafted thereon.
A method of inhibiting gas hydrates, comprising:
- contacting a gas hydrate with a graft copolymer.
A method of inhibiting gas hydrates, comprising:
- contacting a gas hydrate with a graft copolymer prepared by graft polymerizing a N-vinyllactam, a N-vinylamide, an acrylate, an arylamide or a vinyl ester onto a hydrophilic base polymer selected from the group consisting of polyalkylene glycols, polyvinyl alcohols, polyvinylamides, polyvinylpyrrolidone, polyethers, polyesters, polyurethanes, polyacrylamides, polysaccharides, cellulose ethers, polyalkyleneimines, polycarboxylic acids, polyvinylsulfonic acids, polyvinylphosphonic acids and copolymers of the monomer components of these polymers or onto a hydrophobic base polymer selected from the group consisting of polyalkylene glycols, polyethers, poly(meth)acrylates, polyolefins, polystyrene, styrene copolymers, polyvinyl acetate, polyvinyl ethers, polyvinyl formals, polyvinyl acetals, halogenated polyvinyl compounds, polyacrylonitrile, polyamides, polyurethanes, silicones, polycarbonates, polyterephthalates, cellulose, cellulose ethers, cellulose esters, polyoxymethylene and copolymers of the monomer components of these polymers, thereby removing water from the gas hydrate.
Dependencies are inferred from the claim text.