Process for preparing a fat slurry and for preparing a spread with said slurry
Process for preparing an edible fat slurry comprising 60-98% by weight (on the total slurry of oil and fat powder) of an edible oil phase and 2-40% by weight (on the total slurry of oil and fat powder) of fat powder, wherein the fat powder is sprayed directly a mixing vessel to be combined with oil.
1. A process for preparing an edible fat slurry comprising 60-98% by weight (of the total slurry of oil and fat powder) of an edible oil phase and 2-40% by weight (of the total slurry of oil and fat powder) of a fat powder, wherein the fat powder is a powder of a structuring fat and has a bulk density of from 40 to 300 g/L, said process comprising the steps of:
a) providing the fat powder in a mixing vessel;
b) providing the oil phase in an oil vessel;
c) reducing the pressure in the mixing vessel comprising the fat powder to a pressure of less than 0.3 bar, prior to the addition of the oil phase to the mixing vessel;
d) after the pressure in the mixing vessel has been reduced to less than 0.3 bar, adding at least a portion of the oil phase from the oil vessel to the mixing vessel to provide a combined oil phase and fat powder of the above composition; and
e) mixing the combined oil phase and fat powder to form a fat slurry;
wherein the fat powder in step a) is provided to the mixing vessel by feeding the structuring fat in melted form to at least one nozzle, which is connected to the mixing vessel and configured to spray the melted structuring fat through the nozzle into the mixing vessel; and
wherein the structuring fat being sprayed through the nozzle comprises, dissolved in the melted structuring fat, a component gaseous at ambient conditions, wherein said component gaseous at ambient conditions comprises at least 80% carbon dioxide (CO 2 ), by weight of the total amount of said component gaseous at ambient conditions, and is present in an amount at the saturation point for the melted structuring fat; and
wherein the mixing vessel consists of the fat powder during step c).
2. The process of claim 1 , wherein the structuring fat in melted form is cooled to solidify so as to yield the fat powder.
3. The process of claim 1 , wherein the melted structuring fat with the dissolved component gaseous at ambient conditions are being fed to the nozzle at a pressure of between 5 and 400 bars and a temperature of between 35 and 120° C.
4. The process of claim 1 , wherein the pressure in step (c) is reduced to below 0.1 bar.
5. The process of claim 1 , wherein during step (e) the pressure is brought up to atmospheric pressure.
6. The process of claim 1 , wherein at least part of steps d) and e) are carried out simultaneously.
7. The process of claim 1 , wherein the oil phase and the fat powder are mixed by one or more of (a) recirculation means, (b) a dynamic mixer, and (c) a stirrer in the mixing vessel.
8. The process of claim 7 , wherein recirculation means comprises an in-line mixer.
9. The process of claim 1 , wherein the amount of fat powder in the total fat slurry is from 4 to 20% by weight, based on the total fat slurry.
10. The process of claim 1 , wherein the fat powder is a micronised fat powder.
11. The process of claim 1 , wherein the fat powder is made by a process of dissolving a gas pressurised to liquid or supercritical conditions, in melted fat, followed by spraying the gas-containing melted structuring fat through the nozzle into the mixing vessel.
12. A process for making an edible oil-continuous emulsion containing 15-80% (by weight of the total emulsion) of a fat phase and 20-85% (by weight of the total emulsion) of an aqueous phase, which process comprises the steps of:
a) providing the aqueous phase at a temperature below 35° C.,
b) providing a fat slurry of oil and fat powder,
c) mixing said aqueous phase and said fat slurry to obtain an oil-continuous emulsion,
wherein said fat slurry is obtained by the process comprising the steps of claim 1 .
13. The process of claim 1 , 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.
14. The process of claim 1 , wherein the fat powder in step a) is provided to the mixing vessel by feeding the structuring fat in melted form to a plurality of nozzles, wherein each nozzle is connected to the mixing vessel and configured to spray the melted structuring fat through the nozzle into the mixing vessel.
15. The process of claim 11 , wherein the gas pressurised to liquid or supercritical conditions is CO 2 .
16. The method of claim 1 , wherein said component gaseous at ambient conditions is a mixture comprising at least 90% carbon dioxide (CO 2 ), by weight of the total amount of said component gaseous at ambient conditions.
17. The method of claim 1 , wherein said component gaseous at ambient conditions is carbon dioxide (CO 2 ).