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Processing method for chemical production wastewater

A technology for producing wastewater and treatment methods, applied in chemical instruments and methods, natural water treatment, heating water/sewage treatment, etc. The effect of reducing production costs

Active Publication Date: 2012-09-12
JIANGSU JIUJIUJIU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After the toluene sulfonylation of AEN, the amination of enene is carried out directly without separation. After the reaction is completed, the phases are separated, and the oil phase is subjected to the next reaction. The water phase contains mixed salts with a high concentration, which cannot be biochemically treated, and is directly discharged, COD If the value is too high, it will cause environmental pollution
If the water is directly evaporated to dryness, mixed salts will be obtained, and valuable products cannot be separated, which not only wastes resources, but also increases the cost of three wastes treatment

Method used

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  • Processing method for chemical production wastewater

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Add 350ml of dichloromethane, 22.0g of AEN, and 12.6g of p-toluenesulfonyl chloride in a four-neck flask. Add 20ml of 20% ammonia water dropwise at room temperature. After the addition is complete, keep the reaction for 2h. The phases were separated, the methylene chloride phase was subjected to the next reaction, and the water phase was distilled off to obtain 3.17 g of ammonium chloride with a recovery rate of 95.2%. The water recovery was used mechanically.

[0028] (2) After adding 60.0ml of morpholine aqueous solution into the dichloromethane phase, continue to add about 20ml of ammonia water within one hour, raise the temperature to room temperature for reaction, and maintain the reaction for 1 hour. After the reaction, separate the organic phase for the next step of reaction , the water phase was evaporated to remove the solvent to obtain 11.28 g of ammonium p-toluenesulfonate, the recovery rate was 95%, and the water recovery was used mechanically.

Embodiment 2

[0030] Sulfuric acid was added to the water phase in step (2) of Example 1 to acidify the water phase so that the pH of the water phase was 1, and an aqueous p-toluenesulfonic acid solution was obtained. Part of the water can be evaporated as needed to obtain the desired concentration of aqueous solution or crystallized product. All the other are with embodiment 1.

Embodiment 3

[0032] Add 3 times the amount of caustic soda to the water phase in step (2) of Example 1 for alkali fusion treatment, add 1.3 times the amount of alkali to acidify, and rectify p-cresol. All the other are with embodiment 1.

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Abstract

The invention discloses a processing method for chemical production wastewater. The processing method comprises the following steps of: carrying out split-phase on thiazoline enol ester after carrying out sulfonylation on methylbenzene, carrying out enamine on an oil phase, evaporating water in a water phase to dryness to obtain ammonium chloride in the water phase, recycling the evaporated water, thereby reducing the production cost and preventing the ammonium chloride from mixing with water in a product in the next step; carrying out split-phase on the oil phase again after carrying out enamine on the oil phase, carrying out next reaction on the oil phase obtained through secondary split-phase, adding enough caustic soda to the water phase, carrying out alkali fusion treatment, then carrying out acidification, rectifying to obtain p-cresol or directly evaporating water to obtain paratoluenesulfonic acid sodium salt or paratoluenesulfonic acid ammonia or adjusting acidity-basicity toobtain paratoluenesulfonic acid. According to the processing method, paratoluensulfonyl chloride is used and generates salt in an aqueous solution so that multiple industrial raw materials with low cost can be obtained through derivation processing of the salt, thereby changing waste into valuable.

Description

technical field [0001] The invention relates to a treatment method for chemical production wastewater. Background technique [0002] 7-Amino-3-chloro-3-cephem-4-carboxylic acid (7-ACCA) is a key intermediate in the synthesis of cefaclor, while 7-phenylacetamido-3-hydroxy-3-cephem Methyl ester (CHS) is a key intermediate in the synthesis of 7-ACCA. [0003] [0004] The synthesis of CHS is reported in the literature as thiazoline enol ester (AEN), which is obtained through p-toluenesulfonylation, enamination, and bromocyclization. [0005] After the toluene sulfonylation of AEN, the amination of enene is carried out directly without separation. After the reaction is completed, the phases are separated, and the oil phase is subjected to the next reaction. The water phase contains mixed salts with a high concentration, which cannot be biochemically treated, and is directly discharged, COD If the value is too high, it will cause environmental pollution. If the water is dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F9/10C01C1/16C07C39/07C07C37/68C07C309/30C07C303/02C02F103/36
Inventor 李珣珣董垒钱海霞赵鑫峰
Owner JIANGSU JIUJIUJIU TECH
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