Oil bearing material crushing process
An oil bearing vegetable material crushing process including pre-heating and pre-drying the material to generate warm, partially dried oil bearing vegetable material. The partially dried material may then be surface heated rapidly, to generate warm and dried material having a weakened and non-adhering hull. The hull may then be mechanically cracked and removed to yield dehulled oil bearing vegetable material and hull. The dehulled material may be flaked to produce flakes. The flakes may be solvent extracted to generate solvent laden oil and solvent laden meal. The solvent laden meal produced may be desolventized to generate hot, wet meal. The wet meal produced may be dried to generate a hot vapor stream. The hot vapor stream generated by drying the meal is condensed in a condenser. The warm liquid medium produced in the condenser may be used to pre-heat and/or pre-dry the oil bearing vegetable material.
1. An oil bearing vegetable material crushing process including the steps of:
a) pre-heating and pre-drying the oil bearing vegetable material to generate warm, partially dried oil bearing vegetable material, said partially dried oil bearing material having a temperature of about 70 to 75° C. and a moisture content of about 10.0 to 10.5% moisture;
b) surface heating rapidly, the warm and partially dried oil bearing vegetable material of step a) to generate warm and dried oil bearing vegetable material having a weakened, non-adhering hull and a temperature of about 75 to 80° C. and a moisture content of about 10% moisture;
c) mechanically cracking and removing the hull of the oil bearing vegetable material produced in step b), to yield dehulled oil bearing vegetable material and hull;
d) flaking the dehulled oil bearing vegetable material generated by step c) to produce flakes;
e) solvent extracting the flakes produced by step d) to generate solvent laden oil and solvent laden meal;
f) desolventizing the solvent laden meal produced by step e) to generate hot, wet meal;
g) drying the hot, wet meal produced by step f) to generate meal and a hot vapour stream;
characterised in that at least part of the thermal energy contained in the hot vapour stream generated by step g) is condensed in tubes in shell condenser producing a condensate and a warm liquid medium having a temperature of about 60 to 85° C., said warm liquid medium being used in step a) to pre-heat and/or pre-dry the oil bearing vegetable material wherein said warm liquid medium is hot water; and
h) recycling said warm liquid medium from said step (a) to said condenser and passing said warm liquid medium through the tubes of said tubes in shell condenser to remove entrained oils and fines.
2. The process according to claim 1 in which said oil bearing vegetable material is soybean.
3. The process according to claim 1 in which said hot vapour stream is condensed inside the tubes of the condenser.
4. The process according to claim 1 in which said hot vapour stream is introduced into the tubes of the condenser.
5. The process according to claim 1 in which the hot vapour stream entering the tubes of said condenser has a velocity of at least 10 m/sec.
6. The process according to claim 1 in which at least a fraction of said condensate is recycled inside the tubes of said condenser.
7. The process according to claim 6 in which said recycled condensate is introduced into the tubes of said condenser.
8. The process according to claim 1 in which supplementary hot water or steam produced by conventional heating device is used to further pre-heat and/or pre-dry the oil bearing vegetable material of step a).
9. The process according to claim 1 in which said warm liquid medium is further heated by one or more heat exchanger(s) and/or by conventional heating device(s).
10. The process according to claim 1 in which the drying of the hot wet meal in step g) takes place in a rotary drier.