[12] Patent
[11] Patent No.:GC0004550  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/89878
Date of the Decision to Grant the Patent:21/Dec/2016

[21] Application No.:GCC/P/2009/13518

[22] Filing Date:19/5/2009

[30] Priority:

[33] State [32] Priority date [31] Priority No.
JP
20/5/2008
2008-131786

[72] Inventors:1- Noriaki HaraĜŒ2- Hiroyuki ToyoshimaĜŒ3- Hatsutaro Yamazaki

[73] Owner: Hitachi, Ltd, 6-6, Marunouchi 1-chome, Chiyoda-ku, Tokyo, Japan

[74] Agent: Saud M. A. Shawwaf Law Office

  

 

  

[51]IPC:
Int. Cl.: C07C 51/43, 51/44, 63/26 (2006.01)

[56] Cited Documents:

-JP 5-58948 A (Imperial Chemical IndustriesPLC.) 09 March 1993
-JP 2005~200402 A (Mitsui Chemicals, Inc.) 28 July 2005
 
Examiner: Saja Mohammed AlHassan

[54] METHOD OF TREATING A MOTHER LIQUID SEPARATED FROM PURIFIED TEREPHTHALIC ACID
[57] Abstract: It is intended to provide a method of treating a mother liquid separated from a purified terephthalic acid for obtaining recovered water with less impurity in a great amount and at a low cost from a primary mother liquid separated upon crystallization of primary crystals.[Means for Solution] In a method of treating a mother liquid separated from a crystal slurry into crystals of purified terephthalic acid (primary crystals) and the mother liquid (primary mother liquid), the method including an evaporation step of separating and forming a vapor and a mother liquid suspension of crystals of terephthalic acid by flash evaporation and heating evaporation at an atmospheric pressure or lower under the presence of the crystals of terephthalic acid, a step of separating the crystals of terephthalic acid from the mother liquid suspension, and a condensation step of condensing the vapor, thereby forming condensed water.[Selected Drawing] Fig. 1
No. of claims: 9     No. of figures: 3


 

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