Methane Argon

Synthesis Gas Preparation Processes. Synthesis gas for ammonia production consists of hydrogen and nitrogen in about a three to one mole ratio, residual methane, argon introduced with the process air, and traces of carbon oxides. There are several processes available for synthesis gas generation and each is characterized by the specific feedstock used. A typical synthesis gas composition by volume is hydrogen, 73.65% nitrogen, 24.55% methane, <1 ppm-0.8% argon, 100 ppm—0.34% carbon oxides, 2—10 ppm and water vapor, 0.1 ppm. 

In the above-mentioned method by Hodgeson el acifluorfen was determined by GC/ECD after the extraction with a 47-mm PS-DVB disk and derivatization with diazomethane. The conditions for GC/ECD were as follows column, DB-5 fused silica (30 m X 0.32-mm i.d., 0.25-p.m film thickness) He carrier gas velocity, 25 cm s (210°C), detector makeup gas, methane-argon (5 95), 30mLmin column temperature, 50 °C (5 min), 10°Cmin to 210 °C (5 min) and to 230 °C (10 min) injection port and detector temperature, 220 and 300 °C, respectively injection method, splitless mode. The recovery of acifluorfen from purified water, dechlorinated tap water and high humic content surface water fortified at 0.5-2.0 ug was 59-150% and the LOD was 25 ngL Acifluorfen after derivatization with various chlorofor-mates was also determined by GC/MS using an SE-54 column (25 m x 0.20-mm i.d., 0.32- um Aim thickness), and the average recovery of acifluorfen fortified between 0.05 and 0.2 ugL was 78%. ... 

Although dimethylberyllium is a coordination polymer in the solid state,27 it has long been known to be monomeric in the gas phase.28 It has also been found to be monomeric when synthesized from the co-condensation of laser-ablated beryllium atoms and a methane/argon mixture at 10 K.11 Formed in conjunction with several other species, including hydrides (see Section 2.02.2.4), (CH3)2Be was identified from its infrared absorption bands, which were compared to DFT-calculated frequencies (DFT = density functional theory). 

Before the synthesis gas enters the ammonia synthesis loop, essentially all of the oxygen compounds must be completely removed to (l) avoid poisoning the ammonia synthesis catalyst and (2) keep C02 from forming carbamates and ammonium carbonate in the synthesis loop. It is also advantageous to remove the inert gases (methane, argon, etc.) to achieve a higher synthesis conversion per pass.74... 

The same sample of AlP04-5 was used to obtain the results shown in Figure 12.13. Here, the isotherms of methane, argon, nitrogen and carbon monoxide and the corresponding net adsorption energies were determined at 77 K after the adsorbent had teen outgassed by CRTA to 353 K. 

The pre-mixed methane/argon mixture consisted of 1.2% methane and 98.8% argon, both being 99.99% Matheson research grade. Argon/ oxygen and zero air were used as oxidants. Prior to each run the driven section was evacuated with an oil difiFusion pump. Tests were conducted in shock-heated argon to determine possible interference from sodium impurities however, no ionization was detected. 

Figure 4.7. Excess surface tensions as a function of the mole fraction of the second component for carbon monoxide + nitrogen (T = 83.82 K), methane + argon (T = 90.67 K) and for carbon monoxide + methane (T = 90.67 K). The excess is counted with respect to linearity. (Data taken from F.B. Sprow, J.M. Prausnltz, Trans. Faraday Soc. 62 (1966) 1105.) Drawn curves are only meant to guide the eye.

Rest and Graham reported in 1984 that the metal carbonyl complexes CpRh(CO)2, CpIr(CO)2, and Cp Ir(CO)2 can be deposited in methane matrices at 12 K and irradiated to give the corresponding methane oxidative addition products [28]. In addition, the dihydride CpIr(CO)H2 could be irradiated in a methane/argon matrix to generate CpIr(CO)(CH3)H by an alternative route [29]. While the dicarbonyl compounds were not efficient producers of the coordinatively unsaturated intermediate, Perutz found that CpRh(CO)(C2H4) lost... 

Holder, G.D. Corbin, G. Papadopoulos, K.D. Thermodynamic and molecular properties of gas hydrates containing methane, argon and krypton. Ind. Eng. Chem. Fund. 1980, 19, 282-289. 

Methane/Argon/Hydrogen diffusion in the Loschmidt tube... 

To illustrate the Stefan-Maxwell approach in the analysis of the Loschmidt diffusion tube, we apply it to the experimental results obtained by Arnold and Toor (1967). The system is a ternary mixture containing methane, argon and hydrogen. The tube length is 0.40885 m and the two sections of the tube are equal in length. The operating conditions are ... 

Example 8.9-In Diffusion of methane, argon and hydrogen in a capillary... 

Although we shall be mainly interested in the HI between simple solutes such as methane, argon, and the like, for which 6A (a) cannot be measured directly through (8.47), it is instructive at this stage to present an example of real molecules for which the ideal cycle depicted in Fig. 8.3 is applicable, and for which (8.47) can, in principle, be evaluated. 

---