Production of cellulosic biosorbents, used for removing heavy metals from aqueous solution

Before reaction the reaction mixture or one of the components has elemental sulphur added to it. Production of biosorbents, especially for removing heavy metals from aqueous solutions, comprises heating and phosphorylating cellulose containing materials with phosphoric acid or ammonium phosphate in...

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Main Authors LANGE, ECKEHARD, 06846 DESSAU, DE, IKIER, HENDRIK, 06766 WOLFEN, DE, CAMACHO, JUAN., 06766 WOLFEN, DE, FIESELER, CHRISTINE, 06780 ZOERBIG, DE, PIESCHEL, FRIEDEMANN., 06766 WOLFEN, DE
Format Patent
LanguageEnglish
German
Published 08.07.1999
Edition6
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOSITIONS BASED THEREON
DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
DERIVATIVES THEREOF
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
POLYSACCHARIDES
THEIR PREPARATION OR CHEMICAL WORKING-UP
THEIR RELEVANT APPARATUS
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:Before reaction the reaction mixture or one of the components has elemental sulphur added to it. Production of biosorbents, especially for removing heavy metals from aqueous solutions, comprises heating and phosphorylating cellulose containing materials with phosphoric acid or ammonium phosphate in presence of urea, followed by cooling and washing out impurities. Before reaction the reaction mixture or one of the components has elemental sulphur added to it. Independent claims are also included for the following: (i) products with a P content of 5-10% and N content 1-4%, the N being in the form of carbamide groups; and (ii) products as per (i) above but with the synthesis mixture treated with elemental sulphur prior to reaction.
Bibliography:Application Number: DE1997153196