FIELD: chemistry.
SUBSTANCE: invention relates to a separation method intended for removing acetone from a mixture comprising acetone, methyl acetate and methyl iodide. The method includes the following steps: (a) feeding said stream comprising acetone, methyl acetate and methyl iodide into a first distillation zone; (b) feeding acetic acid into said first distillation zone, either by addition of acetic acid to said stream comprising acetone, methyl acetate and methyl iodide or by feeding acetic acid directly to the first distillation zone at one or more points at or above the point of feeding said stream comprising acetone, methyl acetate and methyl iodide into the first distillation zone at step (a), or a combination of both; (c) removing from the first distillation zone a light fraction stream comprising methyl iodide and a heavy fraction stream comprising acetone, methyl acetate, acetic acid, and a reduced amount of methyl iodide; (d) feeding into a second distillation zone the heavy fraction stream from step (c); (e) removing from the second distillation zone a light fraction stream comprising methyl acetate and methyl iodide and a heavy fraction stream comprising acetone, methyl acetate and acetic acid; (f) feeding the heavy fraction stream from step (e) into a third distillation zone; and (g) removing from the third distillation zone a light fraction stream comprising methyl acetate and acetone and a heavy fraction stream comprising methyl acetate and acetic acid.
EFFECT: invention relates to a method of producing acetic anhydride or combined production of acetic anhydride and acetic acid.
24 cl, 1 dwg, 1 ex, 1 tbl
Title | Year | Author | Number |
---|---|---|---|
CARBONYLATION PROCESS | 1999 |
|
RU2213726C2 |
METHOD OF DECREASE AND/OR REMOVAL OF PERMANGANATE-REDUCING COMPOUNDS AND C- ALKYLIODIDE COMPOUNDS | 1997 |
|
RU2181715C2 |
METHOD OF SYNTHESIS OF ACETIC ACID | 1997 |
|
RU2187494C2 |
METHOD OF OBTAINING ACETIC ACID (OPTIONS) | 2003 |
|
RU2329249C2 |
METHOD OF OBTAINING ACETIC ACID | 2003 |
|
RU2336263C2 |
METHOD OF PREPARING ACETIC ACID | 1993 |
|
RU2102379C1 |
METHOD OF PRODUCTION OF ACETIC ACID BY CARBONYLATION IN THE PRESENCE OF IRIDIUM CATALYST | 1997 |
|
RU2183618C2 |
METHOD OF CARBONYLATION PRODUCT PRODUCING | 1994 |
|
RU2133731C1 |
METHOD FOR OXIDATIVE TREATMENT OF RECIRCULATION FLOW IN PREPARING ACETIC ACID BY CARBONYLATION OF METHANOL (VARIANTS) | 2003 |
|
RU2280639C2 |
PRODUCTION OF ACETIC ACID | 2009 |
|
RU2503652C2 |
Authors
Dates
2014-10-10—Published
2009-12-23—Filed