Acid, eggs

Fluid-Displacement Pumps In addition to pumps that depend on the mechanical ac tion of pistons, plungers, or impellers to move the liquid, other devices for this purpose employ displacement by a secondary fluid. This group includes air lifts and acid eggs. 

An acid egg, or blowcase, consists of an egg-shaped container which can be filled with a charge of liquid that is to be pumped. This container is fitted with an inlet pipe for the charge, an outlet pipe for the discharge, and a pipe for the admission of compressed air or gas, as illustrated in Fig. 10-58. Pressure of air or gas on the surface of the liquid forces it out of the discharge pipe. Such pumps can be hand-operated or arranged for semiautomatic or automatic operation. 

FIG. 10-58 A form of acid egg. External controls required for automatic operation are not shown. 

Amino acid Egg white Egg yolk Casein Animal glue (collagen) Wool (keratin) Silk (fibroin) Garlic... 

Investigation of the activity of the entrapped enzyme against externally added D-amino acids (egg PC-based MLV). 

Devices which are used for transporting fluids (liquids and gases) may be divided into pumps, ejectors, injectors, elevators, conveyors, air and gas pressure devices (such as acid eggs, air lifts, pulsometers etc). Pumps may be divided into piston (reciprocating), centrifugal, propeller, rotary-displacement, density, impact and momentum and turbine pumps. Pumps which... 

Displacement Pumps operate by forcing the liquid that is to be moved from one point to another by means of pressure exerted by a gas or vapor. The acid egg (Vol 1, p A88-L) is a device of this type frequently encountered in chemical industry Ref Perry (1950), 1439... 

Acide carboMque (Fr). Phenol Acid Egg or Blowcase is a type of "displacement pump"(qv) used for transferring acids and other corrosive liquids from one apparatus to another by means of compressed air. Its description is given in Refs 1 2. 

The use of acid eggs is safe for acids having no dissolved org matter, otherwise the gaseous phase in the egg (in the... 

Air-displacement systems air lifts, acid eggs or blow cases, jet pumps, barometric legs... 

The pumps discussed in the preceding sections depend on the mechanical action of pistons, impellers, plungers, or other devices to move the fluid. Movement of fluids can also be accomplished by the use of air pressure, and many types of air-displacement systems have been developed for this purpose. The most common of these systems are air lifts, acid eggs, and jet pumps. 

Adi eggs or blow cases are simply closed vessels with inlet and outlet lines and an air connection. Air is admitted to the vessel and forces the liquid out through the discharge line. Operation of acid eggs is intermittent, and the elevation attained depends on the air pressure. Although these systems are inexpensive and easy to operate, they are inefficient. Their use is limited primarily to batchwise operations with corrosive fluids. 

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