Fluid-liquid contacting device and process

摘要

In an aerobic fermentation process, the aeration of the p fermentation medium is effected by passing air through a diaphragm which consists of sheet elastic material bearing at least one perforation made without any removal of the sheet material. Suitable elastic materials are natural and synthetic rubbers which may be reinforced by a fabric. The sheet may be 1/16 -/ba3/16 inch thick and may have 50-200 perforations per sq. cm. in the form of punctures made by a round needle or slits of length 5/1000 -/ba1/8 inch which may intersect to form X, V, or Y shapes. The perforations may be distributed uniformly over the diaphragm or may be confined to the middle or peripheral portion. Fig. 2 shows the diaphragm 7 and woven metal guards 6, 8 mounted in a disperser 2; the disperser is immersed in the liquid and air is supplied through line 3. In response to a difference in pressure across the diaphragm, the perforations open and allow a stream of bubbles to pass into the liquid. Alternatively, the perforations may be provided in a collapsible tube or in ordinary rubber tubing. Examples describe the aeration of the culture mash in the production of streptomycin.ALSO: A diaphragm for dispersing fluids in liquids consists of sheet elastic material bearing at least 25 perforations in the form of intersecting slits made without any removal of the sheet material. Suitable elastic materials are natural and synthetic rubbers which may be reinforced by a fabric. The sheet may be 1/16 - 3/16 inch thick and may have 50-200 perforations per sq. cm.; slits of length 5/1000 ,/ba1/8 inch may intersect to for X, V, or Y shapes. The perforations may be distributed uniformly over the diaphragm or may be confined to the middle or peripheral portion. Fig. 2 shows the diaphragm 7 and woven metal guards 6, 8 mounted in a disperser 2; the disperser is immersed in a liquid and fluid is supplied through line 3. In response to a difference in pressure across the diaphragm, the perforations open and allow a stream of bubbles to pass into the liquid. Alternatively the perforations may be provided in a collapsible tube. The device may be used in chemical processes involving the reaction of a gas and a liquid or for degassing of liquids by blowing therethrough an inert gas.