| abstract |
The invention belongs to chemical fields, are related to the anticorrosion process and device of methyl acetate hydrolysis and acetic acid refining during polyvinyl alcohol disposing mother liquor.The anti-corrosive apparatus includes methyl acetate enrichment facility, methyl acetate full gear device, methyl acetate hydrolysis device, hydrolysis liquid separating apparatus, acetic acid refining device and isopropyl acetate recyclable device.Methyl acetate hydrolysis and acetic acid refining technique mainly include that methyl acetate concentration, methyl acetate full gear, methyl acetate hydrolysis, hydrolyzate separate and acetic acid refining and isopropyl acetate recycle.By enhancing the ability of impurity removal containing halogen in the hydrolysis tower side top Cai Kou setting mass transfer unit (i.e. packing section)；By adding accurate filter, the shredded resin of hydrolyzate entrainment is filtered, it is therefore prevented that enter acetic acid refining system with sulfonic shredded resin.It fundamentally solves the problem of that acetic acid refining equipment etching problem significantly solves the corrosion of acetic acid refining process device, extends 1~5 times of the key equipment service life. |