Heat integration process

Details Heat integration process Heat integration process

C - Chemistry, Metallurgy

07

C

260/648, 202/87

C07C 41/06 (2006.01) B01D 3/14 (2006.01) C07C 41/42 (2006.01) C07C 43/04 (2006.01)

Patent

CA 2001755

ABSTRACT OF THE DISCLOSURE A portion of the heat of vaporization, required to separate and recover methanol from wash water used to remove methanol from a C4 raffinate resulting from the reaction of isobutene containing C4 hydrocarbons and methanol to produce MTBE is recovered by conducting the distillation of the methanol/water mixture at a pressure of 40 to 60 psig, thereby increasing the temperature of the methanol overhead to 104 to 114° C and using the reaction effluent from the MTBE reactor to cool and condense the methanol overhead, said reactor effluent being correspondingly heated prior to entry into a debutanizer tower where unreacted C4's and methanol are removed as a raffinate and MTBE product recovered. It is this raffinate that is washed with water to recover the unreacted methanol, with the methanol/water mixture being distilled as set forth above. In another embodiment a stream having a lower temperature than the methanol overhead is withdrawn from the debutanizer and used to cool the methanol overhead, then the correspondingly heated stream returned to the debutanizer.

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