Method for recovery of terephthalic acid/isophthalic acid refining mother liquor
A technology of isophthalic acid and terephthalic acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems affecting the normal operation of the oxidation batching system, unfavorable stable operation of the oxidation unit, and complicated processes. Achieve the effects of shortening the material cycle, lowering the material requirements for equipment and pipelines, and simplifying the process flow
Active Publication Date: 2012-02-22
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology
Considering the production process of (isophthalic acid / terephthalic acid) PIA / PTA, it will not be the most economical and reasonable to return to the oxidation unit if the mother liquor in the centrifuge of the hydrofining unit / p-toluic acid content is not high In addition, if returning to the oxidation unit, it is necessary to adjust the ratio of the materials in the oxidation batching system accordingly, and the instability of the mother liquor recovery system will directly affect the normal operation of the oxidation batching system, the process is complicated, and it is not conducive to the stability of the oxidation unit run
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[0020] Since the mother liquor recovery system was put into use in June 2007, the operation of the system has been analyzed.
[0021] 1. The effect of JM-601 filter
[0022] (1) Filter effect
[0023] The filtering effect of JM-601 mainly depends on the total solids after filtering. See Table 1 for details. figure 2 :
[0024] Table 1: Total Solids Analysis Data
[0025]
[0026]
[0027] From Table 1 and figure 2 It can be seen that the concentration of the clear liquid from JM-601 is basically stable at about 0.22%, indicating that the filtration situation is relatively stable. The total solid content of JD-404 and JD-602 are relatively stable, while the total solid content of JD-603 fluctuates greatly, which is caused by the difference in the amount of water added each time.
[0028] It can be seen from Table 1 that the solid content in the mother liquor is reduced from 0.71% to 0.22%, which is equivalent to a decrease of 0.49%. The solid content of 0.22% in J...
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A method for recovering mother liquor, especially a method for recovering purified terephthalic acid / isophthalic acid mother liquor. The mother liquor in the mother liquor tank is pumped to the mother liquor cooling tank to be vacuumized, and the flashed gas is pumped into the cooler. After the gas is condensed, it returns to the mother liquor cooling tank; the cooled mother liquor in the mother liquor cooling tank is pumped into the filter for filtration; after the mother liquor is filtered, the filtrate enters the filtrate collection tank and is pumped to the incinerator tail gas spray ; After the filter cake is formed on the inner surface of the filter element, the filtrate on the upper part of the filter tube plate is discharged; the filtrate on the inner side of the lower filter element and the lower part of the filter tube plate is discharged to the buffer tank; the filter cake after being purged and dried by the oxidation tail gas It is pressed into the beating tank; add deionized water to the filter, and use it to wash the undischarged filter cake to the beating tank. The invention adopts the high-precision filtration technology to recover the useful components in the centrifuge mother liquid to the greatest extent, reduce the solid content of the filtrate liquid and the chemical oxygen demand (COD) value, and improve the environment.
Description
technical field [0001] The invention relates to a method for recovering mother liquor, in particular to a method for recovering mother liquor for refining terephthalic acid / isophthalic acid. Background technique [0002] The purified terephthalic acid (PTA) unit of the Polyester Division of Yanshan Petrochemical Company was built in the late 1970s by introducing the patented technology of the American Amoco Company, with a design capacity of 36,000 tons per year. In 1997, the original terephthalic acid plant tried to produce isophthalic acid. In 1998, it officially switched to producing isophthalic acid. The design capacity is 25,000 tons / year. [0003] The purpose of the hydrogenation reaction in the refining unit of the isophthalic acid plant is to remove harmful impurities in the crude isophthalic acid (CIA) in the oxidation unit, so that the quality of the final product can reach the specified standard. The impurities in CIA are mainly the intermediates and side reactio...
Claims
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IPC IPC(8): C07C63/14C07C51/42
Inventor 李志刚李军良徐传海朱良王文翰易智刘秋利杨长红王舰轮李强封志伟杨井文吴多杰石从军王淑仙
Owner CHINA PETROLEUM & CHEM CORP