System and method for acetic acid recovery during terephthalic acid production
AssigneeAMT International, Inc.
InventorsJi-Young Jang, Hyung-Jin Kim, Kuang Wu
Life of this patent
Estimating the term…
Abstract
Disclosed is a distillation system and method for recovering acetic acid from a feed stream containing acetic acid and water stream generated during terephthalic acid production. The invention includes a dehydration column utilizing azeotropic distillation to recover the acetic acid in conjunction with a condenser system to recover the energy. The dehydration column operates with a pressure of at least 1.2 kg/cm2 abs. or higher pressure at the top of the column. The condenser system is a steam generator that condenses the vapor into a concentrated acetic acid stream while generating a low pressure steam of 0.6-2.0 kg/cm abs.
Claims22
A distillation system for recovering acetic acid from water during terephthalic acid production comprising:
- a dehydration column having an overhead section;
- at least one input feed stream containing acetic acid and water;
- an entrainer;
- and
- a condenser to separate the acetic acid from water.
A distillation method for recovering acetic acid from water during the production of terephthalic acid, the method comprising;
- providing an input feed stream of water containing acetic acid;
- distilling the input feed stream in an azeotropic dehydration column having an overhead section into a vapor stream;
- entraining the vapor;
- condensing the vapor stream to separate acetic acid from water;
- and
- outputting a bottom stream having a higher acetic acid concentration than the input feed stream and an output overhead stream having a more dilute acetic acid concentration than the input feed stream.
Dependencies are inferred from the claim text.