Method for treating waste generated during pesticide intermediate production

A processing method and a technology for intermediates, which are applied in the field of separation systems for recovering sulfur, can solve the problems of large demand for chemicals, secondary pollution, and high energy consumption, and achieve improved process economy, high removal rate, and low energy consumption. Effect

Inactive Publication Date: 2017-02-22
天津海威欧能源科技有限责任公司
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the treatment methods of sulfur-containing wastes used at home and abroad include oxidation method, steam stripping method, chemical flocculation method, biochemical method, etc., but the single use of a certain method still has high energy consumption, large demand for chemicals, and reprocessing of end products. Disposal and other issues, so the cost is high, and it is easy to cause secondary pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating waste generated during pesticide intermediate production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of processing method of pesticide intermediate production waste, the steps are as follows:

[0048] ⑴ Adopt 100g of sulfur-containing waste produced by pesticide intermediates (wherein the mass fraction of each component is about: water 46%; sodium chloride 27%; sodium thiosulfate 7%; sulfur 13%; organic matter 7%), and 20g The hydrochloric acid solution (10wt%) was mixed and transported into the reactor B to react at normal temperature and pressure, the stirring speed was 500r / min, and the residence time was 10min.

[0049] (2) The gas generated by the reaction is exported to the lye absorber A. Under normal temperature and pressure, saturated calcium hydroxide solution is used to absorb at a dosage of 60L / h to remove sulfur dioxide and carbon dioxide gas. The content of sulfur dioxide in the gas phase after absorption meets the environmental protection emission requirements.

[0050] (3) After the reaction, the solid-liquid mixture obtained enters the filter C ...

Embodiment 2

[0054] A kind of processing method of pesticide intermediate production waste, the steps are as follows:

[0055] ⑴ 100g of sulfur-containing waste produced by using pesticide intermediates (wherein the mass fraction of each component is about: water 45%; sodium chloride 23%; sodium thiosulfate 15%; sulfur 10%; organic matter 8%), and 100g The hydrochloric acid solution (5wt%) was mixed and transported into the reactor B to react at normal temperature and pressure, the stirring speed was 800r / min, and the residence time was 5min.

[0056](2) The gas generated by the reaction is exported into the lye absorber A and absorbed at normal temperature and pressure using 2wt% sodium hydroxide solution at a dosage of 60L / h to remove sulfur dioxide and carbon dioxide gas. The content of sulfur dioxide in the gas phase after absorption meets environmental protection emission requirements.

[0057] (3) After the reaction, the solid-liquid mixture obtained enters the filter C for normal pr...

Embodiment 3

[0061] A kind of processing method of pesticide intermediate production waste, the steps are as follows:

[0062] ⑴ Adopt 100g of sulfur-containing waste produced by pesticide intermediates (wherein the mass fraction of each component is about: water 46%; sodium chloride 27%; sodium thiosulfate 7%; sulfur 13%; organic matter 7%), and 40g The hydrochloric acid solution (5wt%) was mixed and transported into the reactor B to react at normal temperature and pressure, the stirring speed was 600r / min, and the residence time was 10min.

[0063] (2) The gas generated by the reaction is exported to the lye absorber A. Under normal temperature and pressure, saturated calcium hydroxide solution is used to absorb at a dosage of 60L / h to remove sulfur dioxide and carbon dioxide gas. The content of sulfur dioxide in the gas phase after absorption meets the environmental protection emission requirements.

[0064] (3) After the reaction, the solid-liquid mixture obtained enters the filter C f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for treating waste generated during pesticide intermediate production. The waste generated during pesticide intermediate production is treated by the aid of acid adding reaction processes, and accordingly sulfur-containing substances in the waste can be completely transformed; sulfur and byproducts can be recycled by the aid of filter and solvent-out crystallization processes. The method includes operation of reaction, absorption, filter, solvent-out crystallization, distillation, liquid and solid separation and the like. The method has the advantages of low cost, high efficiency, environmental protection and energy conservation. Besides, the sulfur and the byproducts can be recycled, accordingly, environmental protection requirements can be met, and economic benefits can be increased.

Description

technical field [0001] The invention belongs to the field of chemical separation and environmental engineering, and relates to a separation system and method for solid-liquid separation of pesticide intermediate production waste and recovery of sulfur therefrom, specifically involving operations such as absorption, reaction, filtration, dissolution crystallization, and distillation to achieve the separation goal. [0002] technical background [0003] In the process of pesticide production and processing, waste containing sulfur will inevitably be produced. If it is discharged directly, because the sulfide in the waste is toxic, corrosive and smelly, it will cause great harm to the environment. If it is discharged inadvertently If it enters the water, it will seriously damage the ecological balance of the water body and pollute the water body. Moreover, sulfur-containing gas-phase compounds such as hydrogen sulfide will escape from it, emitting an unpleasant smell, which ser...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B17/02C01D3/04C02F9/10
CPCC01B17/0205C01D3/04C02F1/001C02F1/04C02F1/66C02F9/00C02F2101/101
Inventor 李研张庭云程婧
Owner 天津海威欧能源科技有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap