Method of purifying crude acetone stream
AssigneeLyondell Chemical Technology, L.P.
InventorsDaniel B Pourreau, Roger A Grey, Andrew P Kahn
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method of treating a crude acetone stream. The method generally includes treating a crude acetone stream which has acetone and at least one low-boiling impurity with a catalyst to form a treated acetone stream that has acetone and at least one higher-boiling impurity and then distilling the treated acetone stream to remove at least a portion of the higher-boiling impurity to produce a purified acetone stream. This is particularly helpful in processes where a more pure acetone is desired, including a process for making purified isopropanol.
Claims19
A method of purifying a crude acetone stream which comprises
- a. treating a crude acetone stream which comprises acetone and at least one low-boiling impurity with a zeolite to form a treated acetone stream that comprises acetone and at least one higher-boiling impurity than in the crude acetone stream;
- b. distilling the treated acetone stream to remove at least a portion of the higher-boiling impurity to produce a purified acetone stream.
A method for preparing a purified isopropanol comprising the steps of
- a. feeding a crude acetone stream which comprises acetone and at least one lower boiling impurity to a bed comprising a zeolite to form a treated acetone feed stream that comprises acetone and at least one higher boiling impurity;
- b. distilling the treated acetone stream to remove at least a portion of the higher boiling impurity from the treated acetone stream to produce a purified acetone stream;
- and
- c. feeding the purified acetone stream to a hydrogenation reactor in a process for making isopropanol to produce a crude isopropanol;
- d. distilling the crude isopropanol stream to remove at least a portion of the remaining impurities to produce a purified isopropanol stream.
A method for preparing a purified isopropanol comprising the steps of
- a. feeding an acetone feed stream which comprises acetone and at least one lower boiling impurity to a bed which comprises a zeolite to form a treated acetone feed stream that comprises acetone and at least one higher boiling impurity;
- b. distilling the treated acetone stream to remove at least a portion of the higher boiling impurity from the treated acetone stream to produce a purified acetone stream having a purity of at least 80%;
- c. feeding the purified acetone stream to a hydrogenation reactor in a process for making isopropanol to produce a crude isopropanol;
- and
- d. distilling the crude isopropanol stream to remove at least a portion of the remaining impurities to produce a purified isopropanol stream wherein the purified isopropanol has a purity of at least 99.5%.
Dependencies are inferred from the claim text.