Acetic acid+water azeotropic-rectification energy-saving consumption-reduction method by adding heat pump

Abstract

The invention discloses an acetic acid+water azeotropic-rectification energy-saving consumption-reduction method by adding a heat pump, which is characterized by adding a steam blower and a Venturi ejector vacuum pump, which are connected in series through a pipeline, between a steam drum and a tower bottom reboiler in the traditional azeotropic rectification technique. By using the method, the azeotropic point temperature of the steam-azeotrope former in the acetic acid-water-azeotrope former ternary-phase system in the rectification tower is lowered; heat of the steam in the steam drum is extracted and supplied to the tower bottom reboiler, thereby lowering the consumption of the steam; and the process water is cyclically utilized, thereby achieving the goal of saving energy consumption in public works.

Description

technical field [0001] The invention relates to the technical field of azeotropic rectification of "acetic acid + water" in mother liquor after filtration of crude isophthalic acid suspension in an oxidation unit of a refined isophthalic acid plant. Specifically, it is an energy-saving and consumption-reducing method of "acetic acid + water" azeotropic distillation with a heat pump added. Background technique [0002] There is a vacuum centrifuge for filtering crude isophthalic acid in the oxidation unit of the refined isophthalic acid industrial plant. What is filtered out from the vacuum centrifuge is the "acetic acid + water" mother liquor. The traditional "acetic acid-water-zeotrope" is used to recover acetic acid. "Ternary phase system azeotropic distillation technology, the entrainer uses n-propyl acetate; the disadvantage is that the "water vapor + entrainer" evaporated from the top of the rectification tower uses condensed water to indirectly condense and recover wat...

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Problems solved by technology

[0002] There is a vacuum centrifuge for filtering crude isophthalic acid in the oxidation unit of the refined isophthalic acid industrial plant. What is filtered out from the vacuum centrifuge is the "acetic acid + water" mother liquor. The traditional "acetic acid-water-zeotrope" is used to recover acetic acid. "Ternary phase system azeotropic distillation technology, the entrainer uses n-propyl acetate; the disadvantage is that the "water vapor + entrainer" evaporated from the top of the rectification tower uses condensed water to indirectly condense and recover water and entrainer, The heat of water vapor is lost, and the temperature of the condensed water discharged is high

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