Urea composition and method for producing same

Patent metadata

Field	Value
Publication number	US-2017190632-A1
Application number	US-201515320269-A
Country	US
Kind code	A1
Filing date	Jun 17, 2015
Priority date	Jun 20, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

Disclosed is a particulate, urea-containing composition, to a method and apparatus for producing it, to the use thereof as fertilizer, as technical urea or as feed additive, and to the use of an additive for producing a particulate, urea-containing composition.

First claim

1 . A particulate composition comprising
(i) urea;
and an additive comprising one or both of components (ii) and (iii):
(ii) combination of at least one oligomer or polymer containing amino groups and at least one functionalized polyvinyl compound;
(iii) at least one aliphatic C 2 -C 8 dialdehyde;

where the weight fraction of component (i) is >60 wt % and the weight fraction of the sum of components (ii) and (iii) in the composition is <1 wt %.

2 . The particulate composition of claim 1 , wherein the additive comprises component (iv):
(iv) at least one compound selected from the group of aliphatic dicarboxylic acids, their salts and anhydrides, aliphatic tricarboxylic acids, their salts and anhydrides, aromatic dicarboxylic acids, their salts and anhydrides, and aldehydic acids, their salts and anhydrides,
where the weight fraction of component (i) is >60 wt % and and the weight fraction of the sum of components (ii), (iii), and (iv) in the composition is <1 wt %.

3 . The particulate composition of claim 1 or 2 , comprising
(i) urea;

and an additive comprising component (ii) and one or both of components (iii) and (iv):
(ii) combination of polyethylenimine and polyvinyl alcohol or combination of polyethylenimine and polyvinylamine;
(iii) at least one aliphatic C 2 -C 8 dialdehyde;
(iv) at least one compound selected from the group of aliphatic dicarboxylic acids, their salts and anhydrides, aliphatic tricarboxylic acids, their salts and anhydrides, aromatic dicarboxylic acids, their salts and anhydrides, and aldehydic acids, their salts and anhydrides;

wherein the weight fraction of component (i) is >97 wt % and the weight fraction of the sum of components (ii), (iii), and (iv) in the composition is <1 wt %.

4 . The particulate composition of any of claims 1 - 3 , comprising
(i) urea;
and an additive comprising component (ii) and one or both of components (iii) and (iv):
(ii) combination of polyethylenimine and polyvinylamine;
(iii) ethanedial and/or glutaraldehyde;
(iv) at least one compound selected from the group consisting of oxalic acid, succinic acid, citric acid, phthalic acid, phthalic anhydride, glyoxylic acid, and salts thereof,

where the weight fraction of component (i) is >97 wt % and the weight fraction of the sum of components (ii), (iii), and (iv) in the composition is <1 wt %.

5 . The particulate composition of any of claims 1 - 4 , wherein the polyethylenimine of component (ii) has a molecular weight in the range of 500-2 000 000 Da.

6 . The particulate composition of any of claims 1 - 5 , wherein the polyvinylamine of component (ii) has a molecular weight in the range of 500-1 000 000 Da.

7 . The particulate composition of any of claims 1 - 6 , wherein the weight fraction of component (i) in the composition is >98 wt %, preferably >98.5 wt %.

8 . The particulate composition of any of claims 1 - 7 , wherein the weight fraction of the sum of components (ii), (iii), and (iv) in the composition is <0.5 wt %, preferably <0.4 wt %, more preferably <0.3 wt %, and very preferably <0.25 wt %.

9 . The use of an additive as defined in any of claims 1 - 6 for producing a particulate composition comprising urea.

10 . A method for producing a particulate composition comprising urea, comprising the steps of
(A) providing a urea-containing solution; (B) pelletizing the urea-containing solution with addition of an additive defined as defined in any of claims 1 - 6 .

11 . The method of claim 10 , wherein the urea content of the solution is >60 wt %, preferably >95 wt %, more preferably >97 wt %, very preferably >98 wt %, even more preferably >98.5 wt %.

12 . The method of either of claims 10 and 11 , wherein the pelletizing in step (B) takes place by means of fluidized bed pelletizing, comprising the steps of
(B1) providing urea-containing seeds;
(B2) fluidizing the urea-containing seeds;
(B3) spraying the urea-containing solution onto the seeds, using an additive as defined in any of claims 1 - 6 .

13 . The method of any of claims 10 - 12 , wherein the temperature of the urea-containing solution is >130° C.

14 . The method of any of claims 10 - 13 , comprising step (C):
(C) separating the particulate urea composition after its production into three fractions is separated, where
one fraction (F1) contains particles having the desired target size,
one fraction (F2) contains particles having a size above the desired target size, and
one fraction (F3) contains particles having a size below the desired target size.

15 . The method of any of claims 10 - 14 , comprising step (D):
(D) wet scrubbing.

16 . A particulate composition obtainable by a method of any of claims 10 - 15 .

17 . The use of a particulate urea composition of any of claim 1 - 8 or 15 as fertilizer, as technical urea, or as feed additive.

18 . Apparatus for producing a particulate composition comprising urea, comprising:
(a) a pelletizer; (b) at least one means for adding an additive as described above; (c) at least one means for separating the particulate composition into fractions of different particle size; (d) optionally at least one means for implementing an acid scrub.

Assignees

• Uhde Fertilizer Tech B V
• Thyssenkrupp Ag

Inventors

• Krawczyk Thomas
• Potthoff Matthias
• Vanmarcke Luc
• Bijpost Erik Alexander
• Maslow Alexander

Classifications

• C05G5/12

  Granules or flakes · CPC title

• C08J2479/02

  Polyamines · CPC title

• A61K31/17 Primary

  having the group >N—C(O)—N< or >N—C(S)—N<, e.g. urea, thiourea, carmustine (isoureas, isothioureas A61K31/155; sulfonylureas A61K31/64) · CPC title

• B01J2/16

  by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain · CPC title

• C05C9/00 Primary

  Fertilisers containing urea or urea compounds · CPC title