[12] Patent
[11] Patent No.:GC0004530  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/89626
Date of the Decision to Grant the Patent:18/Dec/2016

[21] Application No.:GC 2013-23677

[22] Filing Date:27/2/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- Noriaki HARAĜŒ2- Hiroyuki TOYOSHIMAĜŒ3- Hatsutaro YAMAZAKI

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

[74] Agent: Saba & Co. T.M.P




Int. Cl.: C07C51/43; C07C51/487; C07C63/24; C07C63/26 (2006.01)

[56] Cited Documents:

- CN 102026952 A (HITACHI PLANT TECHNOLOGIES LTD), 20 April 2011
- CN 101045683 A (MITSUI CHEMICALS INC [JP]), 03 October 2007
Examiner: Eng. Ebrahim AlQurashi

[57] Abstract: The objective of the present invention is to provide a method for efficient use of steam generated in a crystallization step of aromatic dicarboxylic acid purified through a hydrogenation refining step of crude aromatic dicarboxylic acid, by recycling the steam as a source of thermal energy and condensed water, inside the production process of purified aromatic dicarboxylic acid. An efficient thermal energy recycling system is established including a plurality of heat exchangers to heat and dissolve a crude aromatic dicarboxylic acid slurry in the heat dissolution step II using steam generated due to stepwise pressure releases from crystallization tanks in the crystallization step IV. The system also includes a flush drum attached to each of the heat exchangers to collect condensed water from the heat exchanger. The system characterizes a heating unit (and a modified heating unit) with a heating mechanism involving steam streams through a heating steam guiding line 12, a steam recycle line 13, a residual steam release line 14, and a condensed water transfer line 15 to a heating exchanger H-N and the attached flush drum B-N.
No. of claims: 8     No. of figures: 9


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