Production of acrolein and acrylic acid, e.g. chemical intermediate and monomer, comprises dehydrogenation and partial oxidation of propane by adding cycle gas at point where propane in main feed is partly dehydrogenated

    公开(公告)号:DE102004032129A1

    公开(公告)日:2005-03-03

    申请号:DE102004032129

    申请日:2004-07-01

    Applicant: BASF AG

    Abstract: Production of acrolein/acrylic acid (IA/B) comprises dehydrogenation of gas feeds containing propane to gas containing propane and propylene, (partial) separation, gas phase partial oxidation with oxygen to gas containing (IA/B) and excess oxygen and separation, residual gas containing propane, oxygen and optionally propylene is (partly) recycled to first zone. Production of acrolein (IA) and/or acrylic acid (IB) from propane comprises: (1) passing not less than 2 feed gas streams containing propane, including not less than 1 containing fresh propane, into a first reaction zone A, where the propane is subjected to heterogeneously catalyzed dehydrogenation, giving a product gas mixture A containing propane and propylene; (2) passing this mixture (A) into a first separation zone A, in which other components are (partly) separated, leaving product gas mixture A' containing propane and propylene; (3) using A' in a second reaction B for charging oxidation reactor(s), in which propylene in A' is subjected to heterogeneously catalyzed gas phase partial oxidation with molecular oxygen to convert it to a product gas mixture B containing acrolein and/or acrylic acid as intended product and excess oxygen; and (4) separating product gas mixture B in a second separation zone B into the intended product containing product gas mixture B and a residual gas (V) containing unreacted propane, oxygen and optionally unreacted propylene which is (partly) recycled to reaction zone A as one feed stream. The novelty is that residual gas (V) is recycled to reaction zone A at a feed point where not less than 5 mole-% of propane in the other feed stream(s) has already been dehydrogenated.

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