Showing papers on "Ultrafiltration published in 1970"

Binding of anilide-type local anesthetics in human plasma. I. Relationships between binding, physicochemical properties, and anesthetic activity.

Abstract: The rank-order of binding in human plasma for a series of anilide-type local anesthetics, determined by ultrafiltration and gas chromatography, was: bupivacaine > mepivacaine > lidocaine > the N-dimethyl analog of lidocaine. Drugs were added to plasma in citro, pH maintained at 7.4±0.1 and temperatu

A Membrane Ultrafiltration Procedure for Determining Diffusible Calcium in Serum

Abstract: A rapid, simple procedure is described for separating diffusible from proteinbound serum calcium by centrifugation through high-flux ultrafiltration membranes. The mean normal value for ultrafilterable calcium was 57.1% (range 52 to 61%) of the total serum calcium concentration.

Enzyme Processing Using Ultrafiltration Membranes

Abstract: In the past several years there has been a continual increase in the use of ultrafiltration (UF) membranes for concentrating, separating, and purifying various dissolved solutes. The forecast in membrane separation processes as reported by Pattison (1968) will amount to $7.5 million by 1975. Of this total, it was estimated that $37.5 million will be spent in UF processes for industrial, medical, and surgical operations. Parallel in time with membrane-technology development is the increased usage of various enzyme preparations. Specifically, the use of enzymes in laundry detergents has caught the fancy of housewives in the past 2 years. Although the enzyme industry in the United States is by no means new, the recent innovation of enzyme additives in detergents has contributed significantly to the total market. For example, the total U. S. enzyme market in 1968 amounted to approximately $40 million, of which approximately $9 million was for laundry products (Anon., 1969A). However, the latter is expected to increase to $25 to $30 million in 1969 (Anon., 1969B).

Treatment of electrodeposition bath

Abstract: This invention relates to a method of rinsing articles coated by an electrodeposition process in such a manner that at least a portion of the rinse water returns to the electrodeposition bath, thereby reducing dragout losses. The percentage of solids are controlled by utilizing a membrane-controlled selective separation process such as an ultrafiltration process to control the electrodeposition bath composition.

Control of water-soluble acids in an electrodeposition bath

Abstract: This invention relates to a method of controlling water-soluble acids present in a base-solubilized electrodepositable composition, which comprises subjecting the bath to a selective filtration process such as ultrafiltration and thereby removing water-soluble acids from the bath.

Low-Pressure Ultrafiltration Systems for Wastewater Contaminant Removal

Abstract: Low-pressure ultrafiltration is still in the preliminary stages of development as a unit process in municipal waste and wastewater treatment. Recently, the membrane process of reverse osmosis, developed initially for use in desalination, has attracted attention as a promising method for treatment of wastewaters. Data on the separation or removal of pure organic solutes is needed to evaluate the potential application of ultrafiltration systems in wastewater treatment. The organic solutes in wastewater streams cannot, in general, be economically recovered by chemical means. Ultrafiltration has the potential of making possible the economic treatment of at least some industrial wastewaters. A pertinent example is the pulp and paper industry, in particular, research efforts now being conducted by the Pulp Manufacturers Research League.(1,2,3) studies carried out on reverse-osmosis treatment of secondary-sewage plant effluent at Pomona, California(4), have demonstrated the feasibility of reverse osmosis for treatment of complex wastewaters containing relatively high concentrations of organic pollutants.

Ultrafiltration Water Treatment

Abstract: In spite of the increasingly serious problem of pollution in our water supplies, the separation processes used to treat contaminated surface-water supplies have not changed appreciably during the past 30 to 50 years. However, recent developments in ultrafiltration offer public-health engineers a more efficient technique for removing contaminants in water to make it potable.