Business

Kirschner, Elisabeth

doi:10.1021/cen-v074n015.p016

Cited by 25 publications

(11 citation statements)

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“…At present, the importance of phenol is proved by its ever increasing production which reached 1900 million of kilograms in 1995 for the USA alone [1]. Waste waters from the industries mentioned above, and also from many others, contain phenolic compounds which are highly hazardous to aquatic life.…”

Section: Introductionmentioning

confidence: 99%

Wet air oxidation of phenol using active carbon as catalyst

Fortuny

Font

1998

Applied Catalysis B: Environmental

174

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Section: Introductionmentioning

confidence: 99%

Wet air oxidation of phenol using active carbon as catalyst

Fortuny

Font

1998

Applied Catalysis B: Environmental

174

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“…Methanol concentration in permeate of a (i) NaY zeolite membrane, (ii) silicalite membrane (P) and (iii) vapor-liquid equilibrium (13) for the methanol/MTBE system as a function of methanol feed concentration. The production of MTBE as a gasoline additive has gained significant importance during the past decade (11). MTBE is usually produced by reacting isobutene from a mixed-C 4 stream with excess methanol in order to achieve high conversion and to minimize side reactions.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Pervaporation Properties of X- and Y-Type Zeolite Membranes

Kita¹,

Asamura²,

Tanaka³

et al. 1999

ACS Symposium Series

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NaX and NaY zeolite membranes were prepared hydrothermally on the surface of a porous, cylindrical mullite support and were characterized by X-ray diffraction and scanning electron microscopy. The surface of a membrane prepared at 100°C for 5 hours was completely covered with randomly oriented, intergrown NaX or NaY zeolite crystals and the thickness of the membrane was about 20-30 μm. NaX and NaY zeolite membranes preferentially permeated water in pervaporation experiments of water/alcohol mixtures. The membrane was also highly alcohol-selective in pervaporation of alcohol/benzene, cyclohexane, or methyl tert-butyl ether (MTBE). The high selectivity of the NaY zeolite membrane can be attributed to the selective sorption of methanol into the membrane. A pervaporation process using a NaY zeolite membrane may be an alternative method for the industrial purification of MTBE.Pervaporation has gained some acceptance in the chemical industry as an effective process for the separation of azeotropic mixtures {1,2). For example, pervaporation has been applied to the dehydration of organic liquids (ethanol, /-propanol, ethylene glycol etc.). Application of pervaporation for the separation of organic liquid mixtures, such as aliphatic-aromatic hydrocarbons or alcohols-ethers, however, is still very limited because of the low selectivity of most polymer membranes. On the other hand, membranes made from inorganic materials are generally superior to those made from polymeric materials in thermal and mechanical stability as well as chemical resistance. Among inorganic materials, zeolites are promising candidate materials for high-performance pervaporation membranes because of the unique characteristics of zeolite crystals such as molecular sieving, ion exchange, selective adsorption, and catalytic properties. Recently, we reported on the excellent 330

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“…billion pounds of AN were produced in the United States in 1995 (Kirschner, 1996). AN has long been recognized as an acute toxin (Dudley and Neal, 1942).…”

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confidence: 99%