Patent ID: 7198766

Claim:
An apparatus for production of acrylic acid or acrolein, comprising: a) an evaporator for gasifying liquefied propylene and/or propane as raw material of acrylic acid or acrolein, b) a source of water or brine in the range of 0° C. to 50° C. to serve as liquid coolant, c) means for supplying said liquid coolant to said evaporator, d) a source of liquefied propylene and/or propane, e) means for introducing said liquefied propylene and/or propane into said evaporator, wherein said liquefied propylene and/or propane is gasified by said liquid coolant and said liquid coolant is chilled to a range of −10° C. to 40° C. by recovering latent heat of said liquefied propylene and/or propane, f) a catalytic gas phase oxidation reactor, g) means for subjecting resultant gasified propylene and/or propane to said catalytic gas phase oxidation reactor thereby preparing a gas containing acrylic acid or acrolein, and h) means for circulating said chilled coolant from said evaporator to a heat exchanger attached to the apparatus, wherein said heat exchanger is selected from the group consisting of an absorbing solvent cooler and a circulation cooler attached to an acrylic acid absorbing column, a condenser attached to a solvent separating column, and a condenser attached to an acrylic acid refining column; and i) means for adjusting pressure of said evaporator for gasifying liquefied propylene and/or propane in the range of about 0.2 to about 2 MPa in gauge pressure.