NORIT activated carbon

B. 2-Methylcyclopenlane-l,3,5-trione hydrate. A mixture of 200 g. (0.89 mole) of the keto ester prepared above, 910 ml. of water, and 100 ml. of 85% phosphoric acid is healed under reflux for 4 hours and then cooled in an ice-salt bath to —5°. The trione mixed with oxalic acid separates and is collected by filtration and dried under reduced pressure. The dried material is extracted with boiling ether (250-300 ml.) under reflux, and the ethereal extract is separated from the undissolved oxalic acid. The original aqueous filtrate is also extracted with ether in a continuous extractor. The two extracts are combined, and ether is removed by distillation. The crude trione separates as a dark brown solid and is crystallized from ca. 250 ml. of hot water. The once-crystallized, faintly yellow product weighs 95-105 g. (74-82%), m.p. 70-74°. This product is used in the next step without further purification. A better specimen, m.p. 77-78°, which is almost colorless, can be obtained by recrystallization from hot water after treatment with Norit activated carbon. 

A mixture of 5.0 g (0.0357 g/mol) of p-fluorophenylethyl alcohol, 2.0 g (0.007 g/mol) of 5-chloro-2,4-disulphamylaniline, 2.0 g (0.0068 g/mol) of potassium bichromate and 15 ml of concentrated hydrochloric acid (0.176 g/mol) and 25 ml of water is heated under reflux for 1 h. The mixture is allowed to cool, and 15 ml of ether are added to separate the excess of p-fluorophenylethyl alcohol. The aqueous layer is decanted and frozen for 2 h and the precipitate is separated, washed with water and dried in vacuum over phosphoric anhydride. There are collected 1.35 g (yield 47.5%) of the 1,1-dioxide of 3-p-fluorophenyl-methyl-7-sulphamyl-6-chloro-3,4-dihydrobenzo-l,2,4-thiadiazine, which when recrystallised from 30 ml of 50% alcohol on "Norit" active carbon takes the form of a white crystalline substance, melting point is 239°C. 

The carbon support used was a Norit activated carbon (RX3 extra) having a surface area of 1190 m2.g 1 and a pore volume of 1.0 cm3.g . The Co/C catalyst (4.1 wt% Co) was prepared by pore volume impregnation with an aqueous solution of cobalt nitrate (Merck p.a.) followed by drying in air at 383 K (16 h). The promoted catalyst (1.5 wt% Co, 7.7 wt% Mo) was prepared in a special way to ensure a maximum amount of the Co-Mo-S phase (11). Mossbauer spectroscopy of this promoted catalyst clearly showed that only the Co-Mo-S phase was present after sulfiding (11) and furthermore that this Co-Mo-S is probably a Co-Mo-S type II phase, meaning a minor influence of active phase-support interaction (11,12). The catalytic activity of the sulfided catalysts was determined by a thiophene HDS measurement at 673 K and atmospheric pressure, as described elsewhere (10). The thiophene HDS reaction rate constant kHDg per mol Co present (approximated as a first order reaction) was found to be 17 10 s 1 for Co/C and 61 10 3s 1 for Co-Mo/C. 

Fig. 2. Adsorption isotherm data and model fitting of ethane and propane in Norit activated carbon ------ MPSD model -------------Energy distribution model...

Figure 4 shows the adsorption dynamics of ethane in a 4.41 mm half length slab of Norit activated carbon at 30 °C, 1 atm. The results are shown as the fractional uptake versus time. The fractional uptake is defined as the uptake... 

Having obtained the adsorption equilibrium and mass transfer parameters of single component systems (Tables 1 to 2), we are ready to examine the predictability of the model in simulating the sorption kinetics of multicomponent systems on Norit activated carbon. 

Fig. 6. Binary adsorption dynamics of ethane and propane onto Norit activated carbon of...

The checkers observed coloration of this solution and stirred it with 10 g of Norit activated carbon, followed by filtration through a Celite pad. The pad was washed with hot methanol (2 x 50 mL). The submitters did not report any coloration. 

A systematic study of the textural effects was published more recently [60], Starting with the same material, a Norit-activated carbon, two types of modification were carried out (1) the catalyst pores were enlarged by gasification and (2) the pores were narrowed by coke deposition. All the materials were subsequently treated under an inert atmosphere at 1173 K to remove surface functional groups. It was additionally confirmed that all the catalysts exhibited similar amounts of surface groups after reaction. Therefore, the kinetic results obtained could be correlated only with the textural properties of the activated carbons. The following conclusions were reached ... 

Cabot Norit Activated Carbon P.O. Box 105 3800 AC Amersfoort The Netherlands... 

Extensive research, performed at Cabot Norit Activated Carbon, has been done to determine the most optimal conditions for the glyphosate process as well as to study the influence of various properties of the activated carbon catalyst on the glyphosate production. The impact of these quantitative and qualitative parameters on the glyphosate reaction is discussed later. These studies were carried out in a 400 ml aqueous 2-3 wt% PMIDA solution containing 1-5 wt% activated carbon at 60-95 C applying a constant oxygen flow of 0-500ml/min. 

FIGURE 7.26 Heat of adsorption as a function of amount of octylphenol tetraethylene pentamine (OPTP) on Norit-activated carbon. (After CapeUe, A., in Activated Carbon, A Fascinating Material, A. Capelle and F. Devooys, Eds., Norit N.V. Netherlands, 1983, p. 191. With permission.)... 

Adsorption of Polycyclic Aromatic Hydrocarbons by Norit-Activated Carbon... 

An adsorbent layer ( NORIT activated carbon powder d 0.01 mm) in the suspension form with starch was smeared. The layer thickness - after a drying at 150° C temperature - rises as highly as 0.1 0.2 mm. 

Norit activated carbon presented the highest adsorption capacities for COS MM, EM tBM, and sBM. Conversely zeolite 13X had the highest uptake capacity for DMS and iPM and the ST material showed the highest capability to adsorb MES and THT almost the same performance was observed for MES adsorption on zeolite 13X. 

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