Process for purifying byproduct sodium sulfate from pyraclostrobin

Abstract

The invention discloses a process for purifying byproduct sodium sulfate from pyraclostrobin. The process particularly includes steps of feeding wastewater with the sodium sulfate into MVR (mechanical vapor recompression) evaporators; stirring the wastewater for 1-2 hours; purifying the byproduct sodium sulfate by the aid of MVR systems; feeding generated wastewater to sewage treatment plants and treating the wastewater. The wastewater with the sodium sulfate is generated when p-chlorophenyl hydrazine is synthesized. The process has the advantages that useful products in the wastewater from the pyraclostrobin can be recycled, accordingly, utilization value of the wastewater can be increased, deterioration of the water quality due to the wastewater can be reduced, the wastewater treatment cost can be saved, designs for the process for purifying the byproduct sodium sulfate from the pyraclostrobin can be optimized, and requirements on the designs for the process for purifying the byproduct sodium sulfate from the pyraclostrobin can be met.

Description

technical field [0001] The invention relates to the technical field of waste water recovery and treatment, in particular to a purification process of pyraclostrobin by-product sodium sulfate. Background technique [0002] Methoxyacrylate fungicides are a class of low-toxicity, high-efficiency, broad-spectrum, systemic fungicides, and are new types of fungicides with great development potential and market vitality in the world's pesticide industry. Pyraclostrobin is currently the most active methoxyacrylate fungicide. It was first developed and researched by BASF in Germany and launched in the European market in 2002. Pyraclostrobin has the disadvantages of high efficiency, low toxicity, environmental friendliness, and wide application of crops. In just a few years since pyraclostrobin came into the market, the market of this variety has soared rapidly, and the sales have risen rapidly, and it has been listed as the second place in the market of all bacterial agents, second ...

AI Technical Summary

Problems solved by technology

[0006] 1. The pyraclostrobin-synthesized wastewater that is directly transported to the company's sewage treatment plant without workshop treatment contains a lot of harmful substances and produces a large amount of toxic substances in the water, which seriously affects the water quality;

[0007] 2. The pyraclostrobin-synthesized wastewater that is directly transported to the company's sewage treatment plant without workshop treatment contains a lot of acidic harmful substances inside, which can corrode and damage the production equipment of the company's sewage treatment plant, which is not conducive to production and processing;

[0008] 3. The pyraclostrobin-synthesized wastewater that is directly transported to the company's sewage treatment plant without workshop treatment contains sodium sulfate that can be recycled. The high-purity sodium sulfate obtained through distillation and crystallization can be used as a by-product Produced and sold, saving wastewater treatment costs, but directly sent to sewage treatment plants for treatment, can not effectively recover by-products, seriously damaging the economy

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