FIG. One disadvantage of high CO and CO2 concentrations in the feed is that there is a reduction in the partial pressures of ethane and ethylene, which may reduce the rate of the oxidation reaction. (C-mol %) 3.8 and you may need to create a new Wiley Online Library account. 38.7 No. WO 01/90042 and WO 01/90043 do not disclose any benefits of maintaining an amount of CO in the feed to the reactor. At least some of any inert gas present and some of the ethylene from stream (6) may be recovered by separation in a suitable second separation means (8), to leave a stream (2) comprising unreacted ethane, carbon monoxide and any remaining inerts, CO2 or ethylene, which is recycled to the ethane oxidation reactor (3), to maintain the required carbon monoxide amount. 6.6% oxygen, balance nitrogen. The feed comprised 60 vol % ethane, 5 vol % ethylene, 5 vol % water, 6 vol % oxygen, the requisite amount of carbon monoxide, with a balance of nitrogen. 4.9 The recovered vinyl acetate may, if desired, be further purified in known manner. 293° C., 16 barg, 3200/h, 60% ethane, 5% ethylene, 5% water, Learn about our remote access options, Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Reina Mercedes 10, 41012 Seville, Spain, JenaBios GmbH, Orlaweg 2, 00743 Jena, Germany, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain. 82.8 The remaining effluent may be treated as desired, for example to remove at least some of the CO2 produced, and recycled to the oxidation reaction zone to maintain the carbon monoxide amount in the feed to said reaction zone. 4596787 relates to a process for the low temperature oxydehydrogenation of ethane to ethylene using a catalyst having the empirical formula MoaVbNbcSbdXe as therein defined, the elements being present in combination with oxygen. EP-A-0407091 relates to process and catalyst for the production of ethylene and/or acetic acid by oxidation of ethane and/or ethylene in the presence of an oxidation catalyst comprising molybdenum, rhenium and tungsten. feed Carboxylic acid conversions in the range 5 to 80% may be achieved in the second reaction zone for the production of alkenyl carboxylate. 13.7 Accordingly, the present invention also provides an integrated process for the production of alkyl carboxylate from a C2 to C4 alkane and/or a C2 to C4 alkene, which process comprises: It has now been found that the presence of carbon monoxide (CO) in the feed for the oxidation of C2 to C4 alkanes and/or alkenes suppresses the formation of further carbon monoxide and reduces the overall selectivity to carbon oxides (COx). Carbon monoxide may be removed, for example, by oxidation to carbon dioxide and subsequent adsorption. EP-A-1043064 relates to a catalyst composition for the oxidation of ethane to ethylene and/or acetic acid and/or for the oxidation of ethylene to acetic acid which composition comprises in combination with oxygen the elements molybdenum, vanadium, niobium and gold in the absence of palladium according to the empirical formula: MoaWbAucVdNbeYf wherein Y is one or more elements selected from the group consisting of: Cr, Mn, Ta, Ti, B, Al, Ga, In, Pt, Zn, Cd, Bi, Ce, Co, Rh, Ir, Cu, Ag, Fe, Ru, Os, K, Rb, Cs, Mg, Ca, Sr, Ba, Zr, Hf, Ni, P, Pb, Sb, Si, Sn, Tl, U, Re, Te and La; a, b, c, d, e and f represent the gram atom ratios of the elements such that: 0

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