P-ethyltoluene

Reported vapor pressures of p-ethyltoluene at various temperatures and the coefficients for the vapor pressure equations... 

FIGURE 3.1.1.14.1 Logarithm of vapor pressure versus reciprocal temperature for 1 -ethyl-4-methylbenzene (p-ethyltoluene). 

Oxidation rate constant k, for gas-phase second order rate constants, koH for reaction with OH radical, kNQ3 with N03 radical and k03 with 03 or as indicated, data at other temperatures see reference koe = 0.92 x 10n 1VL1 s-1 at room temp, (estimated from structurally similar p-ethyltoluene, Winer et al. 1976) koe(calc) = 1.50 x 10-11 cm3 molecule-1 s-1 at room temp. (SAR, Atkinson 1987) kOH = 1.53 x 10-11 cm3 molecule-1 s-1 at room temp. (Dilling et al. 1988)... 

Ethyl terl-butyl ether (ETBE), 10 548, 574, 576 12 404-405 derivation from ethanol, 10 557 Ethyltoluene, 23 329, 349 o-Ethyltoluene, 23 349 p-Ethyltoluene, 10 597 p-Ethyltoluene precursor, synthesis of, 23 351 p-Ethyltoluene synthesis, molecular sieves in, 16 846... 

It has been found that the disproportionation of toluene over ZSM-5 catalyst can be directed such that p-xylene is the predominant xylene isomer (14-17). This reaction, designated STOP, is one of several in which disubstituted aromatics rich in the para isomer are produced. Others are the alkylation of toluene with methanol to produce p-xylene (15,18) and with ethylene to produce p-ethyltoluene (19,20), as well as the aromatization of olefins (20), paraffins (20) and of methanol... 

Note Normally inhibited with 8-12 ppm 4-7er7-butylcatechol to prevent polymerization. According to Chevron Phillips Company (March 2002), 99.93% styrene contains the following components (ppm) benzene (<1), toluene (<1), ethylbenzene (50), a-meth ylstyrene (175), m + p-xylene (120), o-xylene (125), isopropylbenzene (100), / -propylbenzene (60), m + p-ethyltoluene (20), vinyltoluene (10), phenylacetylene (50), m + p-divinylbenzene (<10), o-divinylbenzene (<5), aldehydes as benzaldehyde (15), and peroxides as benzoyl-peroxides (5). 

Mobil ZSM-5 zeolite catalysts can be modified to reduce the effective pore and channel dimensions. These modified zeolites allow discrimination between molecules of slightly different dimensions. Because of this shape-selective action, p-ethyltoluene is able to diffuse out of the catalyst pores at a rate about three orders of magnitude greater than the two regioisomers. As a result, p-ethyltoluene is formed with very high (97%) selectivity.333... 

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