Urea-containing fertilizers and process for production thereof

Patent metadata

Field	Value
Publication number	US-2018370865-A1
Application number	US-201616062048-A
Country	US
Kind code	A1
Filing date	Dec 17, 2016
Priority date	Dec 17, 2015
Publication date	Dec 27, 2018
Grant date	—

Abstract

A particulate, urea-containing composition and use of an additive for producing a particulate, urea-containing composition and methods of producing a particulate, urea-containing composition.

First claim

1 - 18 . (canceled)

19 . A particulate composition comprising:
(i) urea;
and an additive comprising component (ii) and one or both of components (iii) and (vii):
(ii) one of a combination of polyethyleneimine and polyvinyl alcohol and a combination of polyethyleneimine and polyvinylamine; (iii) at least one aliphatic C 2 -C 8 dialdehyde; (vii) 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,
and an adjuvant comprising one or more of components (iv) to (v):
(iv) sulfur; (v) ammonium sulfate;
wherein the weight fraction of component (i) is greater than 50 wt % and the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 1 wt % and the weight fraction of the sum of components (iv) and (v) in the composition is less than 50 wt % and the weight ratio of components (ii) and (iii) or the weight ratio of components (ii) and (vii) is in the range from 1:20 to 20:1.

20 . The particulate composition of claim 19 wherein component (ii) is a combination of polyethyleneimine and polyvinylamine, component (iii) is one or both of ethanedial and glutaraldehyde; and component (vii) is selected from the group consisting of oxalic acid, succinic acid, citric acid, phthalic acid, phthalic anhydride, glyoxylic acid and salts thereof.

21 . The particulate composition of claim 19 wherein the polyethyleneimine of component (ii) has a molecular weight in the range of 500-2,000,000 Da.

22 . The particulate composition of claim 19 wherein component (ii) includes polyvinylamine having a molecular weight in the range of 500-1,000,000 Da.

23 . The particulate composition of claim 19 wherein the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 0.5 wt %.

24 . The particulate composition of claim 19 wherein the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 0.4 wt %.

25 . The particulate composition of claim 19 wherein the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 0.3 wt %.

26 . The particulate composition of claim 19 wherein the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 0.25 wt %.

27 . A method for producing a particulate composition comprising urea, comprising the steps of:
providing a urea-containing solution; and granulating or prilling the urea-containing solution with addition of one or both of an additive comprising component (ii) and one or both of components (iii) and (vii): (ii) one of a combination of polyethyleneimine and polyvinyl alcohol and a combination of polyethyleneimine and polyvinylamine; (iii) at least one aliphatic C 2 -C 8 dialdehyde; (vii) 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, and an adjuvant comprising one or more of components (iv) to (v): (iv) sulfur; (v) ammonium sulfate.

28 . The method of claim 27 wherein the urea content of the solution is greater than 10 wt %.

29 . The method of claim 27 wherein the urea content of the solution is greater than 50 wt %.

30 . The method of claim 27 wherein said granulating is performed by fluidized bed granulation, comprising the steps of:
providing urea-containing nuclei;
fluidizing the urea-containing nuclei; and
spraying the urea-containing solution onto the nuclei, using one or both of the additive and the adjuvant.

31 . The method of claim 27 wherein the temperature of the urea-containing solution is greater than 120° C.

32 . The method of claim 27 wherein the temperature of the urea-containing solution is greater than 125° C.

33 . The method of claim 27 wherein the temperature of the urea-containing solution is greater than 130° C.

34 . The method as claimed in claim 27 , further comprising:
separating the particulate urea composition after its production into three fractions, wherein 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.

35 . The method of claim 27 further comprising:
wet scrubbing.

36 . A fertilizer comprising:
a particulate urea composition comprising: (i) urea; and an additive comprising component (ii) and one or both of components (iii) and (vii): (ii) one of a combination of polyethyleneimine and polyvinyl alcohol and a combination of polyethyleneimine and polyvinylamine; (iii) at least one aliphatic C 2 -C 8 dialdehyde; (vii) 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, and an adjuvant comprising one or more of components (iv) to (v): (iv) sulfur; (v) ammonium sulfate; wherein the weight fraction of component (i) is greater than 50 wt % and the weight fraction of the sum of components (ii), (iii) and (vii) in the composition is less than 1 wt % and the weight fraction of the sum of components (iv) and (v) in the composition is less than 50 wt % and the weight ratio of components (ii) and (iii) or the weight ratio of components (ii) and (vii) is in the range from 1:20 to 20:1.

Assignees

• Uhde Fertilizer Tech B V
• Thyssenkrupp Ag
• Thyssenkrupp Fertilizer Tech Gmbh

Inventors

• Potthoff Matthias
• Krawczyk Thomas
• Franzrahe Harald
• Vanmarcke Luc Albert

Classifications

• C05G5/12

  Granules or flakes · CPC title

• A23K40/10

  by agglomeration; by granulation, e.g. making powders · CPC title

• C05G3/20

  for preventing the fertilisers being reduced to powder; Anti-dusting additives · CPC title

• A23K50/15

  containing substances which are metabolically converted to proteins, e.g. ammonium salts or urea · CPC title

• A23K20/10

  Organic substances · CPC title