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Tetrachloride phthalic anhydride waste water recovery and treatment method

A technology of tetrafluorobenzoic acid and its treatment method, which is applied in the field of chemical wastewater treatment and utilization, can solve the problems of high cost and unstable quality, and achieve the effects of low cost, improved utilization rate, and single input

Active Publication Date: 2018-12-25
西安瀚宇树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country has already produced small batches of trial products, but the quality is unstable and the cost is high; the raw materials required for the production of pharmaceutical factories mainly rely on imports

Method used

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  • Tetrachloride phthalic anhydride waste water recovery and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The tetrafluorobenzoic acid production wastewater of a factory is black and red, the content of tetrafluorobenzoic acid is 0.5%, the pH is 1-2, and it has peculiar smell. The specific recovery and treatment methods are as follows:

[0018] 1. At room temperature, after the tetrafluorobenzoic acid wastewater is left to settle, filter it with a precision filter, take 600mL of the clarified wastewater obtained after suction filtration, and pass it through a large hole filled with 60mL HYA-105 at a flow rate of 1BV / h. Resin column for adsorbing resin (Φ20×300mm). After testing, the content of tetrafluorobenzoic acid in the column liquid (adsorbed water) drops below 20 ppm, and the sulfuric acid in the column liquid can be further recovered.

[0019] 2. Rinse the resin column adsorbed with tetrafluorobenzoic acid with distilled water to remove residual waste water, sulfuric acid and inorganic salts in the resin pores, and then drain the residual water in the resin column.

...

Embodiment 2

[0027] According to the method of embodiment 1, the tetrafluorobenzoic acid aqueous solution of 720mL 0.1g / L is recovered and processed, every 120mL gets the column liquid once, until receiving 720mL, and adopts national standard method to carry out COD detection to the column liquid, test result See Table 2.

[0028] Adsorption effect of table 2HYA-105 adsorption resin on tetrafluorobenzoic acid

[0029]

[0030]

[0031] It can be seen from Table 2 that the application of HYA-105 macroporous adsorption resin in the recycling of tetrafluorobenzoic acid wastewater has obvious effects and can be widely promoted.

Embodiment 3

[0033] The tetrafluorobenzoic acid production wastewater of a factory is black and red, the content of tetrafluorobenzoic acid is 0.5%, the pH is 1-2, and it has peculiar smell. The specific recovery and treatment methods are as follows:

[0034] 1. At room temperature, after the tetrafluorobenzoic acid wastewater was left to settle, filter it with a precision filter, take 600mL of the clarified wastewater obtained after suction filtration, and pass it through a filter filled with 60mL Amberlite XDA-7 at a flow rate of 1.5BV / h. Resin column of macroporous adsorption resin (Φ20×300mm). After testing, the content of tetrafluorobenzoic acid in the column liquid (adsorbed water) drops below 20 ppm, and the sulfuric acid in the column liquid can be further recovered.

[0035] 2. Rinse the resin column adsorbed with tetrafluorobenzoic acid with distilled water to remove residual waste water, sulfuric acid and inorganic salts in the resin pores, and then drain the residual water in t...

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Abstract

The invention discloses a tetrachloride phthalic anhydride waste water recovery and treatment method. According to the method, tetrachloride phthalic anhydride waste water is precipitated and filteredto obtain waste water without suspended matters, the waste water without the suspended matters passes a fixed bed adsorption column with macroporous styrene adsorption resin, tetrachloride phthalic anhydride is adsorbed on the adsorption resin, inorganic salt and sulfuric acid are not adsorbed, the resin after saturated adsorption is eluted by sodium hydroxide water solution, and eluted sodium tetrachloride phthalic anhydride is concentrated, returned to a workshop and used. The tetrachloride phthalic anhydride waste water is treated, 95% or more of tetrachloride phthalic anhydride is recovered, and waste water treatment and resource utilization are unified.

Description

technical field [0001] The invention relates to the technical field of chemical waste water treatment and utilization, in particular to a method of adopting a macroporous adsorption resin to absorb tetrafluorobenzoic acid in waste water, so as to separate tetrafluorobenzoic acid, sulfuric acid and inorganic salts, and to further recover sulfuric acid through column liquid. Background technique [0002] The main use of tetrafluorobenzoic acid is to synthesize third-generation quinolone drugs such as lomefloxacin, spafloxacin, fleroxacin, ofloxacin, levofloxacin and rufloxacin. At present, the annual sales of third-generation quinolone drugs synthesized from tetrafluorobenzoic acid in the world market reach tens of billions of dollars, and grow at an annual rate of nearly 20%. my country has already produced small batches of trial products, but the quality is unstable and the cost is high; the raw materials required for the production of pharmaceutical factories mainly rely on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/47C07C63/70
CPCC07C51/42C07C51/47C07C63/70
Inventor 郭东前邓宁张华杨林霄
Owner 西安瀚宇树脂科技有限公司
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