Complex comprising oxidative dehydrogenation unit

A chemical complex comprising one or more unit operations selected from the group consisting of a high pressure polyethylene unit, a gas phase polyethylene unit, a slurry phase polyethylene unit, a solution phase polyethylene unit, an acetic acid unit, a vinyl acetate unit, an ethylene epoxide unit, an ethylene glycol unit, an ethanol unit, an ethylene halide unit, an ethanol dehydrogenation unit, and an acetic acid dehydrogenation unit;

• and a steam cracker feeding at least one of a C2 cryogenic distillation tower and a hydrogenation unit to remove acetylene, the improvement consisting of integrating an oxidative dehydrogenation unit for the oxidative dehydrogenation of ethane in a mixed stream of ethylene and ethane with;
• i) a bottom stream from the C2 cryogenic distillation tower, or;
• ii) the C2 cryogenic distillation tower taking a feed from a lower tray from the C2 cryogenic distillation tower and returning the product to a higher tray in the C2 cryogenic distillation tower, or;
• iii) both i) and ii);
• wherein the oxidative dehydrogenation of ethane to ethylene is conducted at a temperature from 250° C. to 600° C., a pressure from 0.5 to 100 psi (3.4 to 689.5 kPa) and has a productivity of not less than 1000 g of olefin per kg of catalyst per hour in the presence of a catalyst selected from the group consisting of:
• i) catalysts of the formula
• NixAaBbDdOe
• wherein
• x is a number from 0.1 to 0.9, preferably from 0.3 to 0.9, most preferably from 0.5 to 0.85, most preferably 0.6 to 0.8;
• a is a number from 0.04 to 0.9;
• b is a number from 0 to 0.5;
• d is a number from 0 to 0.5;
• e is a number to satisfy the valence state of the catalyst;
• A is selected from the group consisting Ti, Ta, V, Nb, Hf, W, Y, Zn, Zr, Si and Al or mixtures thereof;
• B is selected from the group consisting of La, Ce, Pr, Nd, Sm, Sb, Sn, Bi, Pb, Tl, In, Te, Cr, Mn, Mo, Fe, Co, Cu, Ru, Rh, Pd, Pt, Ag, Cd, Os, Ir, Au, Hg, and mixtures thereof;
• D is selected from the group consisting of Ca, K, Mg, Li, Na, Sr, Ba, Cs, and Rb and mixtures thereof;
• and
• O is oxygen;
• ii) catalysts of the formula
• MofXgYhOi
• wherein
• X is selected from the group consisting of Ba, Ca, Cr, Mn, Nb, Ta, Ti, Te, V, W and mixtures thereof;
• Y is selected from the group consisting of Bi, Ce, Co, Cu, Fe, K, Mg, V, Ni, P, Pb, Sb, Si, Sn, Ti, U, and mixtures thereof;
• f=1;
• g is 0 to 2;
• h=0 to 2, with the proviso that the total value of h for Co, Ni, Fe and mixtures thereof is less than 0.5;
• i is a number to satisfy the valence state of the catalyst;
• iii) catalysts of the formula
• VxMoyNbzTemMenOp
• wherein Me is a metal selected from the group consisting of Ta, Ti, W, Hf, Zr, Sb and mixtures thereof;
• and
• x is from 0.1 to 3;
• y is from 0.5 to 1.5;
• z is from 0.001 to 3;
• m is from 0.001 to 5;
• n is from 0 to 2
• and p is a number to satisfy the valence state of the mixed oxide catalyst;
• iv) catalysts of the formula
• MOaVbNbcTeeOn
• wherein a=1.0;
• b=0.05 to 1.0, c=0.001 to 1.0, e=0.001 to 0.5, and n is determined by the oxidation states of the other elements;
• and
• v) catalysts of the formula
• MoaVbXcYdZeMfOn
• wherein X is at least one of Nb and Ta;
• Y is at least one of Sb and Ni;
• Z is at least of one of the Te, Ga, Pd, W, Bi and Al;
• M is at least one of Fe, Co, Cu, Cr, Ti, Ce, Zr, Mn, Pb, Mg, Sn, Pt, Si, La, K, Ag and In;
• a=1.0 (normalized);
• b=0.05 to 1.0;
• c=0.001 to 1.0;
• d=0.001 to 1.0;
• e=0.001 to 0.5;
• and f=0.001 to 0.3;
• and n is determined by the oxidation states of the other elements.