Catalytic precipitation

Catalytic poisoning, 19 60 Catalytic precipitation, 19 63-64 Catalytic processes... 

Protein-bound iodine (PBI) s Spectrophometry (catalytic) Precipitate proteins with TCA, ash or digest the protein, and measure the catalytic effect of I on the Ce(rV)-As(ni) reaction rate by measuring absorbance of Ce(IV) at 420 nm after 20 min... 

Ecole Nationale Superieure du Petrole et des Moteurs Formation Industrie end point (or FBP - final boiling point) electrostatic precipitation ethyl tertiary butyl ether European Union extra-urban driving cycle volume fraction distilled at 70-100-180-210°C Fachausschuss Mineralol-und-Brennstoff-Normung fluid catalytic cracking Food and Drug Administration front end octane number fluorescent indicator adsorption flame ionization detector... 

Commercial production of acetic acid has been revolutionized in the decade 1978—1988. Butane—naphtha Hquid-phase catalytic oxidation has declined precipitously as methanol [67-56-1] or methyl acetate [79-20-9] carbonylation has become the technology of choice in the world market. By-product acetic acid recovery in other hydrocarbon oxidations, eg, in xylene oxidation to terephthaUc acid and propylene conversion to acryflc acid, has also grown. Production from synthesis gas is increasing and the development of alternative raw materials is under serious consideration following widespread dislocations in the cost of raw material (see Chemurgy). 

PMo220 4q, is analytically usehil, being formed in the molybdenum test for phosphate ion. Poly- and heteropolymolybdate ions are used in the precipitation of dyes. The protonated forms of the ions are strongly acidic and many poly- and heteropolymolybdate compounds have catalytic activity that is attributable to their acid—base or redox properties. 

Once an undesirable material is created, the most widely used approach to exhaust emission control is the appHcation of add-on control devices (6). Eor organic vapors, these devices can be one of two types, combustion or capture. AppHcable combustion devices include thermal iaciaerators (qv), ie, rotary kilns, Hquid injection combusters, fixed hearths, and uidi2ed-bed combustors catalytic oxidi2ation devices flares or boilers/process heaters. Primary appHcable capture devices include condensers, adsorbers, and absorbers, although such techniques as precipitation and membrane filtration ate finding increased appHcation. A comparison of the primary control alternatives is shown in Table 1 (see also Absorption Adsorption Membrane technology). 

Baking Particulates (dust), CO, SO2, hydrocarbons, and fluorides High-efficiency cyclone, electrostatic precipitators, scrubbers, catalytic combustion or incinerators, flares, baghouse... 

A solution of the thioamide 1 (2.5 mmol) and bromoacetone (0.34 g, 2.5 mmol) or 2-bromoacetophenone (0.5 g, 2.5 mmol) in CHC13 (20 mL) containing a catalytic amount of TsOH was heated under reflux for 1 h. The resulting solution was concentrated under reduced pressure and the residue was treated with H20 (50 mL) to precipitate the hydrobromide of the product. The salt was dissolved in 50% aq EtOH and 20% aq NaOH was added to give the 1,4-thiazepine. 

The ester 3 (R1 = H, R2 = (CH2)3NMe2 23 g. 67 mmol), obtained by catalytic hydrogenation of the corresponding nitro compound, was heated in refluxing xylene (700 mL) for 15 h. The solvent was removed under reduced pressure and the residue was dissolved in 1 M HOAc and charcoal was added. The filtered solution was made alkaline with coned NH3 and the resulting precipitate was extracted with CHC1V The extract was washed with H20, dried and evaporated in vacuo, leaving the product yield 9.25 g (47%) mp 151-152 C. 

A mixture of 3-phenoxyphthalonitrile (3 220 mg, 1.7 mmol), urea (180 mg, 3.0 mmol), Zn(OAc)2 (60 mg, 0.33 mmol), Na2S04 (280 mg, 2 mmol), and a catalytic amount of (NH4)2Mo04 was kept for 1 h at 160-170 C and 0.5 h at 180-190 C. After cooling, the solid formed was extracted with CHClj, the solvent evaporated, and the residue treated with coned HC1. The product was dissolved in acetone and then precipitated with dil NH3. The precipitate was washed with H20 andMeOH, and dried yield 60 mg (25%). 

A mixture of 4,5-di(pentyloxy)phthalonitrile (A 69 mg, 0.23 mmol), 3,4,5,6-tetraphenylphthalonitrile (B lOOmg, 0.23 mmol), Ni(0Ac)2 (35 mg, 0.2mmol). and catalytic amounts of DBU in pentan-l-ol (3mL) was heated under N2 for 24 h under reflux. The cooled blue-green solution was poured into MeOH/H20 (5 1, 50 mL), and the precipitate formed was centrifuged, washed with MeOH, and dried in vacuo. The separation of the prepared compounds was performed by column chromatography (toluene/hexane 1 1). The fractions were collected and the solvent evaporated. The order of elution was ABBB (0.5 mg, 0.1 %), ABAB (7.5 mg, 1.4%), AABB (2 mg, 0.5%), AAAB (15 mg, 2.3%) and AAAA (9 mg, 1.6%). No BBBB-type phthalocyanine was formed. 

A mixture of monolauryl phosphate sodium salt and triethylamine in H20 was treated with glycidol at 80°C for 8 h to give 98% lauryl 2,3-dihydro-xypropyl phosphate sodium salt [304]. Dyeing aids for polyester fibers exist of triethanolamine salts of ethoxylated phenol-styrene adduct phosphate esters [294], Fatty ethanolamide phosphate surfactant are obtained from the reaction of fatty alcohols and fatty ethanolamides with phosphorus pentoxide and neutralization of the product [295]. A double bond in the alkyl group of phosphoric acid esters alter the properties of the molecule. Diethylethanolamine salt of oleyl phosphate is effectively used as a dispersant for antimony oxide in a mixture of xylene-type solvent and water. The composition is useful as an additive for preventing functional deterioration of fluid catalytic cracking catalysts for heavy petroleum fractions. When it was allowed to stand at room temperature for 1 month it shows almost no precipitation [241]. 

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