US 11,028,035 B2 · Method and device for purifying acetone/water mixtures by means of double-effect distillation

Abstract

The invention relates to a method for separating acetone from acetone/water mixtures, according to which a partial flow of the acetone/water mixture is concentrated in a column operating under positive pressure in order to obtain a product with an acetone concentration of at least 80 wt. %, and a partial flow of the acetone/water mixture is concentrated in a column operating under normal pressure. The top product from the column operated under positive pressure is used to heat the bottom product of the column operated under normal pressure, by means of a heat exchanger, and the top product is then introduced into the column operated under normal pressure, above the supply of the partial flow of the acetone/water mixture. This method allows the specific energy demand for acetone separation to be significantly reduced, thereby presenting considerable cost advantages. The invention also relates to a device for carrying out such a method.

Claims14

Dependent claims

A method for separating acetone from an acetone/water mixture, comprising:

concentrating a partial first flow of the acetone/water mixture in at least one first column to produce a product having an acetone concentration of at least 80 wt %,
wherein the at least one first column is operated under positive pressure;
concentrating a partial second flow of the acetone/water mixture in at least one second column,
wherein the at least one second column is operated under normal pressure,
wherein a top product from the at least one first column is used to heat a bottom product of the at least one second column via a heat exchanger, and
wherein the top product is subsequently introduced into the at least one second column above a supply of the partial second flow of the acetone/water mixture.

3 more elements

A device comprising:

at least one first column for separating a partial first flow of an acetone/water mixture,
wherein the at least one first column is operated under positive pressure,
at least one second column for separating a partial second flow of an acetone/water mixture,
wherein the at least one second column is operated under normal pressure,
supply lines for the partial first flow and the partial second flow of an acetone/water mixture to the at least one first column and the at least one second column,
at least one heat exchanger in fluid communication with a top of the at least one first column and a bottom of the at least one second column configured to enable a transfer of heat between a top product of the at least one first column and the bottom product of the at least one second column, and
a supply line for the top product of the at least one first column via which the at least one heat exchanger is connected to an upper part of the at least one second column,
wherein the supply line is connected to the at least one second column above the supply line for a partial second flow of an acetone/water mixture.

5 more elements

Dependencies are inferred from the claim text.

Method and device for purifying acetone/water mixtures by means of double-effect distillation

Life of this patent

Method and device for purifying acetone/water mixtures by means of double-effect distillation

Life of this patent

Abstract

Claims14