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US 4,228,037 AGranted
Spherical activated carbon having low dusting property and high physical strength and process for producing the same
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorsKuniaki Hino, Yasuo Uehara, Yasushi Nishimura, Kazuhiro Watanabe, Yoshio Okada
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Abstract
A process for producing spherical particles of activated carbon having a low susceptibility to dusting.
Claims11
A process for producing spherical particles of activated carbon having a low susceptibility to dusting, comprising the steps of:
- heating while continuously stirring a mixture of a pitch having a softening point of 50.degree. to 350.degree. C., a carbon content of 80 to 97%, an atomic ratio of hydrogen to carbon of 0.3 to 2.0, and a content of nitrobenzene insoluble matter of below 60%, at least one aromatic compound miscible with said pitch and 0.1 to 10% by weight based on the amount of said pitch of at least one polymer or one copolymer having the chain hydrocarbon moiety as a major component thereof, thereby liquefying homogeneously said mixture;
- dispersing said liquefied mixture into an aqueous solution containing a suspending agent, thereby obtaining microspheres of said mixture dispersed in said solution;
- and
- subjecting the thus obtained microspheres to a series of treatments of removal of said aromatic compound, infusibilization, carbonization and activation.
1 more element
The spherical particles of activated carbon having a low susceptibility to dusting and prepared by the process comprising the steps of:
- heating while continuously stirring a mixture of a pitch having a softening point of 50.degree. to 350.degree. C., a carbon content of 80 to 97% by weight, an atomic ratio of hydrogen to carbon of 0.3 to 2.0, and a content of nitrobenzene-insoluble matter of below 60% by weight, at least one aromatic compound miscible with said pitch and 0.1 to 10% by weight based on the amount of said pitch of at least one polymer or one copolymer having the chain hydrocarbon moiety as a major component thereof, thereby liquefying homogeneously said mixture;
- dispersing said liquefied mixture into an aqueous solution containing a suspending agent, thereby obtaining microspheres of said mixture dispersed in said solution;
- and
- subjecting the thus-obtained microspheres to a series of treatments of removal of said aromatic compound, infusibilization, carbonization and activation.
1 more element
Dependencies are inferred from the claim text.