Abstract: A water-immiscible organic extractant system can economically be used to recover citric acid from molasses fermenter beer containing a high salt content by using a process combination of passing the aqueous raffinate from the citric acid extraction step through a basic anion-exchange resin to adsorb residual citric acid and release citrate anions from previously formed salt cation-citrate compounds. Trisodium citrate is then eluted from the resin by passing aqueous sodium hydroxide therethrough.

Abstract: An effervescent analgesic antacid composition having reduced sodium content is produced from a mixture of an analgesic, such as acetylsalicylic acid, acetaminophen, ketoprofen or a mixture thereof, citric acid, sodium bicarbonate, calcium carbonate, potassium bicarbonate, and minor amounts of flavors and sweeteners.

Abstract: An improved apparatus is described wherein a semi-permeable membrane is supported against a convex surface and wherein the likelihood of damage to such membrane during mounting and use is minimized. In the apparatus the membrane is stretched over the convex surface of a first member in a manner allowing, during assembly of the apparatus, any fluid located between the membrane and the convex surface to escape therefrom around the edges of the membrane. The membrane is clamped between the convex surface of said first member and a complemental concave surface of a second member such that the membrane is held in stretched relationship against and in close contact with the convex surface. Means is provided to form a fluid-tight seal between said membrane and said second member.In a preferred embodiment, the membrane is used in a polarographic electrode apparatus used to detect specific components of a fluid sample.