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US 5,456,775 AGranted
Internal additive and process for the preparation of certain crystallized forms of ammonium nitrate and industrial uses of the said forms
AssigneeCfpi
InventorsJoseph Schapira, Jean-Claude Cheminaud, Pascal Petitbon, Loic Guenard, Daniel Chaillou
Life of this patent
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Abstract
Internal additive for the preparation of prills of ammonium nitrate comprising, in aqueous solution, a mixture of at least one salt of sulphonic acid and of at least one salt of polycarboxylic acid.
Claims14
Process for manufacturing prills of ammonium nitrate, comprising,
- a) selecting on the one hand a melted solution of ammonium nitrate and on the other hand a proportion with respect to the dry matter of the ammonium nitrate from 0.005 to 0.12% by weight in dry matter of an internal additive consisting of an aqueous solution containing
- at least one salt of sulphonic acid selected from the group consisting of
- the salts of alkylbenzene sulphonic acids selected from the group consisting of the salts of alkaline metals, the ammonium salts, the amine or alkanolamine salts of linear or branched mono- and polyalkyl acids, the alkyl portion of which comprises from 1 to 12 carbon atoms,
- the salts of alkylnaphthalene sulphonic acids selected from the group consisting of the salts of alkaline metals, the ammonium salts, the amine or alkanolamine salts of linear or branched mono- and polyalkyl acids, the alkyl portion of which comprises from 1 to 12 carbon atoms,
- the salts of aryl- or alkylaryl-sulphonic acids polymerized with formaldehyde, the said salts being alkaline metal salts, ammonium salts, amine or alkanol-amine salts, aryl being benzene or naphthalene, alkyl being a linear or branched radical having from 1 to 12 carbon atoms, and
- at least one salt of polycarboxylic acid selected from the group consisting of the alkaline metal salts, the ammonium salts, the amine or alkanolamine salts of homopolymers and/or of copolymers of ethylene carboxylic acids which result from the polymerization of ethylenic acids of the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic acid, itaconic acid, crotonic acid, aconitic acid, sinapic acid, mesaconic acid, undecylenic acid, angelic acid, hydroxy-acrylic acid and maleic anhydride;
- b) forming an intimate mixture of the melted solution of ammonium nitrate and of the internal additive and
- c) transforming the thus obtained intimate mixture in grains or prills.
5 more elements
Process for manufacturing prills of ammonium nitrate, comprising,
- a) selecting on the one hand a melted solution of ammonium nitrate having a dry matter content from 94 to 99% by weight and a temperature from 140.degree. to 170.degree. C. and on the other hand a proportion with respect to the dry matter of the ammonium nitrate from 0.005 to 0.12% by weight in dry matter of an internal additive consisting of an aqueous solution containing
- from 10 to 90% by weight expressed in dry matter of at least one salt of sulphonic acid selected from the group consisting of
- the salts of alkylbenzene sulphonic acids selected from the group consisting of the salts of alkaline metals, the ammonium salts, the amine or alkanolamine salts of linear or branched mono- and polyalkyl acids, the alkyl portion of which comprises from 1 to 12 carbon atoms,
- the salts of alkylnaphthalene sulphonic acids selected from the group consisting of the salts of alkaline metals, the ammonium salts, the amine or alkanolamine salts of linear or branched mono- and polyalkyl acids, the alkyl portion of which comprises from 1 to 12 carbon atoms,
- the salts of aryl- or alkylaryl-sulphonic acids polymerized with formaldehyde, the said salts being alkaline metal salts, ammonium salts, amine or alkanol-amine salts, aryl being benzene or naphthalene, alkyl being a linear or branched radical having from 1 to 12 carbon atoms, and
- from 90 to 10% by weight expressed in dry matter of at least one salt of polycarboxylic acid selected from the group consisting of the alkaline metal salts, the ammonium salts, the amine or alkanolamine salts of homopolymers and/or of copolymers of ethylene carboxylic acids which result from the polymerization of ethylenic acids of the group consisting of acrylic acid, methacrylic acid, fumaric acid, maleic acid, itaconic acid, crotonic acid, aconitic acid, sinapic acid, mesaconic acid, undecylenic acid, angelic acid, hydroxy-acrylic acid and maleic anhydride;
- b) forming an intimate mixture of the melted solution of ammonium nitrate and of the internal additive and
- c) transforming the thus obtained intimate mixture in grains or prills using a prilling tower or a granulating drum.
5 more elements
Dependencies are inferred from the claim text.