PROCESS FOR PREPARING FAT CONTINUOUS EMULSIONS CONTAINING MIDSTOCK OR CREAM
A process for preparing a water-in-oil emulsion which emulsion comprises both oil, a midstock fraction and a hardstock fraction. The process involves blending the melted hardstock fraction with a water-continuous dispersion comprising part or all of the oil and part or all of the midstock fraction, at least part of said midstock fraction being crystallized, wherein the temperature of the aqueous dispersion is below 15° C.
1 . Process for preparing a fat-continuous emulsion, which emulsion comprises 15-70% of an aqueous phase and 30-85% of a fat phase, said fat phase comprising 1-35% midstock (weight % on total fat phase), 3-50% hardstock (weight % on total fat phase), and 10-80% oil (weight % on total fat phase), which process comprises the steps of:
a. providing a water-continuous dispersion at a temperature of between 0° C. and 15° C. comprising an aqueous phase as the continuous phase with dispersed therein oil and midstock fraction, wherein at least 10% by weight of said midstock fraction dispersed in the aqueous phase is crystallized;
b. providing the melted hardstock fat at a temperature of between 30° C. and 60° C.;
c. combining the water-continuous dispersion of step a. with the melted hardstock fat of step b.;
d. subjecting the mixture obtained after step c. to a high shear device to provide a fat-continuous emulsion,
wherein the temperature of the mixture obtained from step c. is below the melting point of the hardstock fat.
2 . Process according to claim 1 , wherein the dispersion of step a. is obtained by mixing continuously in-line an aqueous dispersion of the midstock at a temperature of from 0 to 15° C. with the oil at a temperature of from 0 to 25° C.
3 . Process according to claim 1 , wherein the dispersion of step a. is obtained by providing a stirred tank comprising the oil dispersed in the aqueous phase and the midstock dispersed in the aqueous phase, which stirred tank is held at a temperature of from 0 to 15° C. for at least 30 minutes.
4 . Process according to claim 1 , wherein the temperature of the aqueous dispersion in step a. is between 0 and 10° C.
5 . Process according to claim 1 , wherein the temperature of the melted hardstock in step b. is between 30 and 55° C., preferably between 35° C. and 50° C., even more preferably between 35° C. and 45° C.
6 . Process according to claim 1 , wherein at least 20% by weight of said midstock fraction dispersed in the aqueous phase is crystallized.
7 . Process according to claim 1 , wherein the midstock is a dairy fat.
8 . Process according to claim 1 , wherein the water-continuous dispersion of step a. comprises 50-100% (by weight based on the aqueous dispersion) of cream.
9 . Process according to claim 1 , wherein the high shear device is a high shear mixing process in a high shear mixer having a rotor and a stator, which mixer has a residence time of less than 3 seconds, and sufficient shear to effect emulsification of water droplets in oil having a droplet size d 3,3 . of less than 15 micrometer.
10 . Process according to claim 1 , wherein subjecting the mixture in step d. to a high shear device is followed by subjecting the mixture to a pin stirrer.
11 . Process according to claim 1 , wherein the weight ratio oil:midstock is between 1:0.2 and 1:3.
12 . Process according to claim 1 , wherein the weight ratio of vegetable oil:hardstock is from 1:0.1 to 1:1.
13 . Process according to claim 1 , wherein the fat continuous emulsion is a spreadable emulsion.
14 . Process according to claim 1 , wherein the composition comprises 40-80% fat.
15 . Process according to claim 1 , wherein said fat phase comprises 5-25% midstock (weight % on total fat phase), 5-30% hardstock (weight % on total fat phase), and 30-70% oil (weight % on total fat phase.