Cryogenic spray process
The invention relates to a spray crystallization process for making solid particles suitable for structuring an oil containing dispersion, solid particles obtainable by said process and use of said particles for structuring oil containing dispersions.
1. Spray crystallization process for making solid particles suitable for structuring an oil containing dispersion, the process comprising:
preparing a molten mixture comprising a structuring agent;
subjecting the molten mixture to a first pressure P 1 ;
expanding said mixture by spraying it through an orifice to an environment having a second pressure P 2 thereby atomizing the molten mixture; and
contacting the atomized molten mixture with a cryogenic cooling medium;
wherein P 1 is greater than P 2 and wherein P 1 minus P 2 is equal to or greater than 20 bar.
2. Process according to claim 1 wherein the structuring agent comprises structuring fat, preferably the structuring agent consists of one or more structuring fats.
3. Process according to claim 2 wherein the structuring fat has a solid fat content N10 from 50 to 100%, N20 from 26 to 95% and N35 from 5 to 60%.
4. Process according to claim 1 wherein the solid particles are an edible fat powder.
5. Process according to claim 1 wherein the solid particles comprise at least 80 wt % structuring fat.
6. The process according to claim 5 wherein the solid particles comprise at least 90 wt % structuring fat.
7. The process according to claim 6 wherein the solid particles comprise at least 98 wt % structuring fat.
8. The process according to claim 5 wherein the solid particles essentially consist of structuring fat.
9. Process according to claim 1 wherein P 1 minus P 2 is equal to or greater than 25 bar.
10. Process according to claim 1 wherein the cryogenic cooling medium is liquid nitrogen.
11. Process according to claim 1 wherein the atomized molten mixture is sprayed into a field of cryogenic cooling medium.
12. Process according to claim 1 wherein the solid particles have a free flowing bulk density at 5 degrees Celsius of at least 100 gram/liter.
13. Process according to claim 12 wherein the solid particles have a free flowing bulk density at 5 degrees Celsius of at least 200.
14. Process according to claim 1 wherein P 1 minus P 2 is equal to or greater than 85 bar.