# US 2014/0360239 A1 · Composition of a magnesium sulfate/urea compound

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- Number: US 2014/0360239 A1
- Document ID: US20140360239A1
- Status: Published application
- Kind: A1
- Application number: 14/369,961
- Filed: 2012-12-28
- Published: 2014-12-11
- Earliest claimed: 2011-12-30
- Assignees: K+S Kali GmbH
- Applicants: K+S KALI GmbH
- Inventors: Ulrich Kleine-Kleffmann; Wolfgang Walczyk
- Web page: https://patentgrep.com/patent/US20140360239A1

## CPC

- C05C 9/00: Fertilisers containing urea or urea compounds
- C05D 9/00: Other inorganic fertilisers
- C07C 273/02: of urea, its salts, complexes or addition compounds
- C05C: NITROGENOUS FERTILISERS
- C05D: INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The subject of the invention is a composition containing at least 80 wt. %, with reference to the total weight of the composition, of a magnesium-sulfate-urea compound of Formula (I): [MgSO4.m CO(NH2)2.n H2O] (I), in which m is in the range from 0.9 to 1.1 and n is in the range from 2.1 to 3.1, where the composition, with reference to the total weight of the composition, contains less than 10 wt. % free MgSO4 in the form of the anhydrate or in the form of urea-free hydrates of the magnesium sulfate, such as magnesium sulfate or magnesium-sulfate hexahydrate and/or less than 10 wt. % uncombined urea. In particular, m in Formula (I) indicates the value 1. In particular, n in Formula (I) indicates the value 3. The invention also concerns the manufacture of the compositions and their utilization as fertilizers or fertilizer additives.

## Claims

### Claim 1

A composition comprising at least 80 wt %, based on a total weight of the composition, of a magnesium-sulfate-urea compound of Formula (I):
[MgSO4.m CO(NH2)2.n H2O] (I),
wherein
m is in a range from 0.9 to 1.1,
n is in a range from 2.9 to 3.1, and
the composition comprises, to based on the total weight of the composition, (i) less than 10 wt % of free MgSO4 in an anhydrate form or in a form of a hydrate of the magnesium sulfate, (ii) less than 10 wt % uncombined urea, or both (i) and (ii).

### Claim 2 (depends on 1)

The composition of claim 1, comprising, based on the total weight of the composition, (i) less than 5 wt % of free MgSO4 in an anhydrate form or in a form of a hydrate of the magnesium sulfate, (ii) less than 5 wt % uncombined urea, or both (i) and (ii).

### Claim 3 (depends on 1)

The composition of claim 1, wherein m in Formula (I) is 1.0.

### Claim 4 (depends on 1)

The composition of claim 1, wherein in Formula (I) m is 1.0 and n is 3.0.

### Claim 5 (depends on 1)

A process for making the composition of claim 1, comprising converting an anhydrous magnesium sulfate with urea and water.

### Claim 6 (depends on 5)

The process of claim 5, wherein the anhydrous magnesium sulfate, urea and water are present in a molar ratio of magnesium sulfate to urea in a range from 1:0.9 to 1:1.1 and a molar ratio of magnesium sulfate to water in a range from 1:2.9 to 1: 3.1.

### Claim 7 (depends on 5)

The process of claim 5, wherein water is added to a mixture of anhydrous magnesium sulfate and urea.

### Claim 8 (depends on 5)

The process of claim 5, further comprising granulating a reaction mass during the conversion, or immediately after the conversion, when the reaction mass is still plastic.

### Claim 9 (depends on 1)

A process for making the composition of claim 1, comprising first converting a magnesium sulfate mixture with urea in a molar ratio in a range of 1:0.9 to 1:1.1 to obtain a mixture, and then adding urea to the mixture.

### Claim 10 (depends on 9)

The process of claim 9, further comprising adding an additional 10 to 30 mole % of urea, based on the initially employed amount of urea.

### Claim 11 (depends on 1)

A process for making the composition of claim 1, comprising converting an anhydrous magnesium sulfate, urea and magnesium sulfate, where a molar ratio of anhydrous magnesium sulfate:urea is in a range from 1:1.65 to 1:1.85 and a molar ratio of anhydrous magnesium sulfate:magnesium sulfate is in a range from 1:0.65 to 1:0.85.

### Claim 12 (depends on 1)

A fertilizer comprising the composition of claim 1.

### Claim 13 (depends on 1)

A nitrogen-magnesium-sulfur fertilizer composition, comprising the composition of claim 1 and magnesium sulfate.

### Claim 14 (depends on 1)

A nitrogen-magnesium-sulfur fertilizer composition, comprising the composition of claim 1 and at least one further component selected from the group consisting of a urease inhibitor and a nitrification inhibitor.

### Claim 15 (depends on 1)

A process for irrigation fertilizing an agricultural or gardening substrate, comprising contacting the substrate with water, the composition of claim 1, and optionally one or more additives, with substantially no surplus water.

### Claim 16 (depends on 1)

The composition of claim 1, comprising (i) less than 10 wt % of free MgSO4 in an anhydrate form or in a form of a hydrate of the magnesium sulfate.

### Claim 17 (depends on 1)

The composition of claim 1, comprising (ii) less than 10 wt % uncombined urea.

### Claim 18 (depends on 1)

The composition of claim 1, comprising (i) less than 10 wt % of free MgSO4 in an anhydrate form or in a form of a hydrate of the magnesium sulfate, and (ii) less than 10 wt % uncombined urea.