TWO-PHASE GAS/SOLVENT INJECTOR FOR VISCOUS LIQUIDS
Publication Date: 2004-Mar-18
The IP.com Prior Art Database
By using a two-phase gas/solvent injection method a gas or vapor stream is pre-mixed with a low-viscosity liquid solvent stream prior to injection into the viscous liquid stream.
It is often difficult to achieve small bubble sizes when injecting gas or vapor into viscous liquids without expending excessive amounts of energy, such as when using high-pressure gas jets exiting through multiple small orifices. Small bubble sizes are critical to achieving rapid dissolution rates.
Small gas bubbles can be created efficiently in viscous liquids by using a two-phase gas/solvent injection method. In this method, a gas or vapor stream is pre-mixed with a low-viscosity liquid solvent stream prior to injection into the viscous liquid stream. Preferred solvents are those that are miscible with the viscous liquid. When the pre-mixed “froth” of low-viscosity liquid and gas enters the viscous liquid, small bubbles in the froth persist after injection and separate, thereby achieving rapid dissolution in the viscous liquid. By using a two-phase method of injection the bubbles of gas or vapor are pre-sized prior to injection into the viscous solution, allowing for more uniform and rapid dissolution.
The method is effective for values of the volumetric flow ratio of the gas or vapor stream to that of the solvent stream that are less than or greater than one, preferably from 1 to 10. The method is suitable for use with viscous liquids and solvents having viscosity ratios from 10:1 to 10,000:1, preferably from 50:1 to 1000:1.
Figure 1. Schematic of Two-Phase Gas/Solvent Injector for Viscous Liquids