Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PROCESS FOR PURIFICATION OF AQUEOUS ACID SOLUTIONS
Document Type and Number:
WIPO Patent Application WO/2005/102993
Kind Code:
A1
Abstract:
A process for the purification of aqueous acid solutions which can dispense with the step of removing chloride ions and which is reduced in the damage to an ion exchanger (such as an ion-exchange column) and thereby permits repeated use of an ion exchanger and lengthened service thereof to bring about a cut in the manufacturing cost. Specifically, a process for the purification of an aqueous solution of an acid (A) by passing an aqueous solution to be treated which contains an acid (A) and a contaminant acid (B) through an ion-exchange column filled with an anion-exchange resin having an anion adsorption selectivity between acids (A) and (B), characterized in that an aqueous solution of acid (A) having a concentration lower than that of the aqueous solution to be treated is passed through the column prior to the passing of the aqueous solution to be treated through the column.

Inventors:
Kobayashi, Hiromitsu c/o Adeka Corporation (2-35 Higashiogu 7-chome, Arakawa-k, Tokyo 53, 11685, JP)
Nito, Hirohisa c/o Adeka Corporation (2-35 Higashiogu 7-chome, Arakawa-k, Tokyo 53, 11685, JP)
Application Number:
PCT/JP2005/007612
Publication Date:
November 03, 2005
Filing Date:
April 21, 2005
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ADEKA CORPORATION (2-35, Higashiogu 7-chome Arakawa-k, Tokyo 54, 11685, JP)
Kobayashi, Hiromitsu c/o Adeka Corporation (2-35 Higashiogu 7-chome, Arakawa-k, Tokyo 53, 11685, JP)
Nito, Hirohisa c/o Adeka Corporation (2-35 Higashiogu 7-chome, Arakawa-k, Tokyo 53, 11685, JP)
International Classes:
B01J41/04; C07C303/44; C07C309/07; C07C309/08; (IPC1-7): C07C303/44; B01J41/04; C07C309/07
Foreign References:
JP2001064249A
JPH10204052A
Attorney, Agent or Firm:
Kondo, Rieko (AKOSU BUILDING, 30 Kanda Sakuma-cho 3-chome, Chiyoda-ku Tokyo 25, 10100, JP)
Download PDF: