Spray atomization
View Patent ↗The present invention provides a feedstock composition for increasing the efficiency of atomization in hydrocarbon processing that includes a water-in-hydrocarbon oil emulsion including a non-ionic surfactant capable of stabilizing the emulsion and having a hydrophilic-lipophilic balance of greater than about 12. The emulsion includes water droplets of about 5 to about 10 microns in diameter, the droplets being dispersed substantially uniformly in the hydrocarbon oil phase. These surfactants are capable of stabilizing the water-in-hydrocarbon oil emulsion under relevant temperature and pressure conditions for hydrocarbon processing. The inventive feedstock composition provides a metastable water-in-oil emulsion where expanding water vapor explodes under spray conditions where the system pressure is released, demolishing a larger oil droplet and producing smaller oil droplets.
1. A process for preparing a feedstock emulsion composition with increased efficiency of atomization comprising the steps of:
(a) providing a water source;
(b) providing a hydrocarbon oil source;
(c) providing a non-ionic surfactant having a hydrophilic-lipophilic balance of greater than about 12, said surfactant being selected from the group consisting of ethoxylated alkyl phenols, ethylene oxide propylene oxide block copolymers, polymerized alcohols and amines, and combinations thereof, and
(d) combining components (a), (b) and (c), wherein said combining comprises mixing components (a), (b) and (c) on the feed side of a spray nozzle under temperatures of greater than about 200-500° F. and under pressure conditions greater than steam vapor pressure to form a stabilized water-in-hydrocarbon oil simple emulsion comprising a hydrocarbon oil phase for use in fluidized catalytic cracking, said non-ionic surfactant being present in an amount suitable to stabilize said emulsion; wherein said emulsion comprises water droplets dispersed substantially uniformly in said hydrocarbon oil phase.
2. The process of claim 1 , wherein said combining comprises first mixing said surfactant with said water to form a surfactant liquid, and subsequently mixing said surfactant liquid with said hydrocarbon oil to form said emulsion.
3. The process of claim 1 , wherein components (a), (b) and (c) are combined on the feed side of a spray nozzle and subsequently passed through said spray nozzle, whereby a controlled hydrocarbon droplet size and distribution is produced.
4. The process of claim 1 , wherein said hydrophilic-lipophilic balance of the non-ionic surfactant is about 15 to about 16.
5. The process of claim 1 , wherein said water droplets are of about 5 to about 10 microns in diameter.
6. The process of claim 1 , wherein the water is present in amounts of about 3 to about 15% by volume of the total feedstock emulsion composition.
7. The process of claim 1 , wherein the hydrocarbon oil is present in amounts of about 84 to about 97% by volume of the total feedstock emulsion composition.
8. The process of claim 1 , wherein the non-ionic surfactant is present in amounts of about 10 ppm-1% by weight of the total feedstock emulsion composition.
9. The process of claim 1 , wherein the non-ionic surfactant is present in amounts of about 500 ppm-1% by volume of the total feedstock emulsion composition.