Mixed Trimethylpentanes

PRDKRTIES RESEARCH GRADE PURE GRADE technical GRADE PROPERTIES TECHNICAL GRADE 

Othw OimithyllMxanes trace trece 0.6 Other Dimethylhexanee IS 

Initiil boiing point Initial boiliiw point 235 

Acidity, diitlllition rmldui neuiraT mutnl Acidity. dirtiHation raiidua Mutril 

Nonvolitili imttir, pmtii/100 ml O.OOOS OlOOOS Nonwoiatile matter, grami lOO ml DOOOS 

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In a mixed solvent system, it is possible to control the particle size by changing the composition ratio. In a dispersion polymerization of methyl methacrylate in a mixed solvent of trimethylpentane and carbon tetrachloride, the size of the particle increases as the fraction of carbon tetrachloride, which has affinity to methyl methacrylate, increases. 

Dissolve sample in 2,2,4-trimethylpentane and bring to volume. Mix solution thoroughly. 

Ointment Alcuronium Chloride TLC/ HPLC Add 2,2,4-trimethylpentane vortex, add MeOH-H 0 (45 5), mix centrifuge, use lower layer Silica CHClj-acetone (7 1) 350 nm USP 23, p. 41 [5]... 

Mixed butenes obtained by ethylene dimerization are used for paraffinic alkylation (isobutane + n-butene —> trimethylpentanes) or to make propene by a subsequent metathesis reaction (ethylene + 2-butene —> 1 propene cf. Section 2.3.3). Higher ethylene oligomers are also used as high-octane-number gasoline components. 

The one-step derivatization of polyurethane began with soaking the sample in toluene for 10 min and in ethanol for 20 min. After vacuum drying overnight, the sample was placed in 50 mL of 0.25M n-octadecyl isocyanate in trimethylpentane under dry nitrogen, and was incubated, with mixing, for 1 h at 80°C. The sample was removed, soaked twice for 1 min in ethanol, twice in deionized water, and redried to yield n -octadecyl-derivatized polyurethane. 

When butenes are used instead of ethylene, a lower temperature and a fine tuning of the acidity of the IL are required to avoid cracking reactions and heavy byproduct formation. The continuous butene alkylation has been performed for more than 500 h with no loss of activity and stable selectivity (80-90% isooctanes are obtained containing more than 90% trimethylpentanes MON = 90-95 RON = 95-98). A high level of mixing is essential for a high selectivity and then for a good quality alkylate. It has been shown that the addition of copper(I) chloride to the acidic chloro-aluminate improves the reaction performances [29]. 

Battino, R. Thermodynamics of binary solutions of nonelectrolytes with 2,2,4-trimethylpentane. I. Volume of mixing (25.deg.) and vapor-liquid equilibrium (35-75.deg.) with cyclohexane J. Phys. Chem. 1966, 70,3408-3416... 

Fluorinated silica and alumina have also been used for isobutane alkylation with olefins in a batch reactor at 0°C. The fluorinated alumina was active only when mixed with BF3 H2O, but the fluorinated silica was active by itself The selectivity to trimethylpentanes obtained with these catalysts is much lower than that obtained with H2SO4 as a catalyst (48). At 80°C, however, F/AI2O3 catalysts are active for isobutane/2-butene alkylation, though relatively low butene conversions (27% for the most active catalyst containing 1.3% F) are obtained (49). As expected, octenes are the predominant hydrocarbons in the Cg fraction at such a low conversions. The F/AI2O3 catalysts contained both Bronsted and Lewis acid sites in a proportion that depends on the F loading. A good correlation between... 

In each reactor zone, an acid/hydrocarbon dispersion enters from the previous zone. In the second zone plus all later zones, the hydrocarbon droplets in the entering dispersion contain mainly isobutane and alkylate. The hydrocarbon droplets that are initially obtained as the feed mixture of isobutane and olefin is injected into each zone are obviously of different composition as compared with other droplets in the zone. Coalescence of droplets, followed by their fragmentation, obviously occurs in each zone. Such a coalescence-fragmentation sequence promotes mixing of hydrocarbons in the droplets (12,13). Such a sequence causes higher isobutane/olefin ratios, which results in improved alkylation processes. On the negative side, olefins and alkylate are also mixed and small amounts of trimethylpentanes (TMPs) and olefins react with the loss of quality (14). 

Separating solvent Mix 50 ml trimethylpentane, 110 ml ethyl acetate, 20 ml glacial acetic acid, 100 ml water in a separating funnel, leave the phases to separate, and pour the lower phase to waste. The upper phase is the TLC solvent. The level added to the TLC tanks should be to just below the level of the sample loaded on to each plate ( 0.5 cm). 

The composition of depentanized alkylate from mixed butenes was determined in API Project 6, and although the HF alkylate contains more 2,2,4-trimethylpentane both of the alkylates have much the same octane number ... 

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