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Salicylic acid production wastewater treatment method

A technology for producing wastewater and treatment methods, applied in water/sewage treatment, water/sludge/sewage treatment, mechanically oscillating water/sewage treatment, etc. Simple operation, efficient removal, easy industrial application effect

Pending Publication Date: 2021-05-11
江苏普源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If CaO is first dissolved in water to generate Ca(OH) 2 Then add it to the waste water for reaction, although it can solve the problem of CaSO4 coating, but due to Ca(OH) 2 Low solubility, need to use more water, increase the cost, and will further increase the volume of waste liquid, also have higher requirements for the site and container, poor operability, difficult to achieve

Method used

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  • Salicylic acid production wastewater treatment method

Examples

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Effect test

Embodiment 1

[0030] Measure the content of sodium sulfate in the salicylic acid production wastewater, and calculate the total consumption of calcium oxide powder required to react with the sodium sulfate. At room temperature, divide the calcium oxide powder required for the reaction into 3 batches, start timing when the first batch of calcium oxide powder is added to the salicylic acid production wastewater, add the second batch of calcium oxide powder after 10 minutes of reaction, After continuing the reaction for 10 minutes, add the third batch of calcium oxide powder, and continue the reaction for 10 minutes until the reaction ends. During the reaction process, the whole process was stirred, and the stirring speed was 150 rpm. Ultrasonic treatment was performed each time calcium oxide powder was added, each ultrasonic time was 2.5min, ultrasonic power was 50W / L, and ultrasonic frequency was 90kHz. Use external ultrasonic vibrator or interpolation probe ultrasonic. After the reaction ...

Embodiment 2

[0032] Measure the content of sodium sulfate in the salicylic acid production wastewater, and calculate the total consumption of calcium oxide powder required to react with the sodium sulfate. At room temperature, divide the calcium oxide powder required for the reaction into 3 batches, start timing when the first batch of calcium oxide powder is added to the salicylic acid production wastewater, add the second batch of calcium oxide powder after 10 minutes of reaction, After continuing the reaction for 10 minutes, add the third batch of calcium oxide powder, and continue the reaction for 10 minutes until the reaction ends. During the reaction process, the whole process was stirred, and the stirring speed was 170 rpm. Ultrasonic treatment was performed each time the calcium oxide powder was added, the ultrasonic time was 2 min each time, the ultrasonic power was 60 W / L, and the ultrasonic frequency was 80 kHz. Use external ultrasonic vibrator or interpolation probe ultrasonic...

Embodiment 3

[0034] Measure the content of sodium sulfate in the salicylic acid production wastewater, and calculate the total consumption of calcium oxide powder required to react with the sodium sulfate. At room temperature, divide the calcium oxide powder required for the reaction into 4 batches, start timing when the first batch of calcium oxide powder is added to the salicylic acid production wastewater, and add the second batch of calcium oxide powder after 7.5 minutes of reaction After another 7.5 minutes of reaction, the third batch of calcium oxide powder was added, and after the reaction was continued for 7.5 minutes, the fourth batch of calcium oxide powder was added until the reaction ended. During the reaction process, the whole process was stirred, and the stirring speed was 180 rpm. Ultrasonic treatment was performed each time the calcium oxide powder was added, and the ultrasonic time was 1.5 min each time, the ultrasonic power was 70W / L, and the ultrasonic frequency was 80...

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Abstract

The invention provides a salicylic acid production wastewater treatment method, which comprises: measuring the content of sodium sulfate in salicylic acid production wastewater, and calculating the total amount of calcium oxide powder required by the reaction with the sodium sulfate; adding the total amount of calcium oxide powder into the salicylic acid production wastewater in batches for reaction, wherein ultrasonic treatment is assisted when the calcium oxide powder is added each time; and removing calcium sulfate precipitate generated by the reaction after the reaction is totally completed, and reusing clear liquid in the salicylic acid production process. According to the method, the calcium oxide powder is added in batches, and ultrasonic treatment is assisted, so that the problem of coating of calcium sulfate generated by reaction on the calcium oxide powder is effectively solved, the removal rate of sodium sulfate reaches 93% or above, and reuse of treated wastewater in production is realized.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a treatment method for salicylic acid production waste water. Background technique [0002] The production wastewater of salicylic acid contains high concentration of sodium sulfate, and the treatment volume is large and difficult. At present, the method of evaporation, concentration and crystallization is mainly used, but this method has high equipment investment in fixed assets, large depreciation loss, high energy consumption, and the added value of the by-product sodium sulfate is low and cannot be used for subsequent production, which increases the production cost of the enterprise. Ca(OH) can also be used 2 Treating Sodium Sulfate Wastewater to Generate CaSO 4 Precipitation, but Ca(OH) 2 Higher prices will directly affect the economic benefits of the enterprise. [0003] CaO is cheap and can generate Ca(OH) when it meets water 2 . CaO can be used to treat sodium s...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/36C02F101/10C02F103/36
CPCC02F1/58C02F1/36C02F2103/36C02F2101/101
Inventor 徐冰
Owner 江苏普源化工有限公司
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