Method for recycling pyridine from chemical production wastewater

A technology for chemical production and wastewater, applied in organic chemistry, extraction water/sewage treatment, etc., can solve the problem of high treatment cost, achieve high removal rate, low cycle loss, and low water solubility

Active Publication Date: 2011-07-20
中国中化股份有限公司 +2
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for further refining of pyridine solutions with a concentration above 10%. If this method is used to recover pyridine from chemical production wastewater, a large amount of steam consumption will lead to high processing costs.

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 recycling pyridine from chemical production wastewater
  • Method for recycling pyridine from chemical production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The wastewater was taken from the paraquat production workshop of Jinan Lvba Chemicals Co., Ltd., with a pyridine concentration of 3000 mg / L and pH=10.

[0023] First, 1440L of aviation kerosene, 64L of surfactant L-113A and 96L of liquid paraffin were formulated into the oil phase, and put into 3m 3 In the emulsification kettle, start stirring, and add 800L of 15% dilute sulfuric acid as the water phase at the same time, and stir the oil-water two-phase at 2900 rpm for 30 minutes to obtain a stable W / O emulsion.

[0024] Then disperse 300L emulsion in 8m 3 In the paraquat wastewater, start stirring, control the speed of extraction at 120 rpm for 30 minutes, and let stand to separate layers. The upper layer is the extraction phase and enters the demulsification device; the lower layer is the treated wastewater. The pyridine concentration is 0.6mg / L after being sent to the biochemical treatment device for routine treatment.

[0025] The upper extraction phase is demuls...

Embodiment 2

[0027] Wastewater source is the same as embodiment 1.

[0028] First set the 1365m 3 Aviation kerosene, 45L surfactant L-113B and 90L liquid paraffin are prepared into the oil phase, put into 3m 3 Turn on the stirring of the emulsification kettle, and add 1000L of 15% dilute sulfuric acid as the water phase at the same time, and stir the oil-water two-phase at 2900 rpm for 30 minutes to obtain a stable W / O emulsion.

[0029] Then disperse 250L emulsion in 8m 3 In the paraquat wastewater, start stirring, control the speed of extraction at 120 rpm for 45 minutes, and let stand to separate layers. The upper layer is the extraction phase and enters the demulsification device; the lower layer is the treated wastewater. The pyridine concentration is 0.5 mg / L after being sent to the biochemical treatment device for routine treatment.

[0030] The upper extraction phase is demulsified under the action of the high-voltage electrostatic field in the demulsification device and divided...

Embodiment 3

[0032] The wastewater was taken from the production workshop of organophosphorus flame retardants of Nantong Jiangshan Chemical Co., Ltd., with a pyridine concentration of 15454 mg / L and a pH of 10-11.

[0033] First, 1440L of aviation kerosene, 64L of surfactant L113A and 96L of liquid paraffin were formulated into the oil phase, and put into 3m 3 Turn on the stirring of the emulsification kettle, and add 800L of 20% dilute sulfuric acid as the water phase at the same time, and stir the oil-water two phases at 2900 rpm for 30 minutes to obtain a stable W / O emulsion.

[0034] Then disperse 1000L emulsion in 8m 3 In the waste water to be treated, start stirring, control the rotation speed of 120 rpm to extract for 30 minutes, and let it stand for stratification. The upper layer is the extraction phase and enters the demulsification device; the lower layer is the treated wastewater. The pyridine concentration is 0.8mg / L after being sent to the biochemical treatment device for r...

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

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for recycling pyridine from pyridine wastewater through the liquid membrane separation technology. The toxic pollutant pyridine can be removed while the resource recovery can be realized. The method comprises the following steps: (1) preparing emulsion; (2) performing liquid membrane extraction; and (3) performing demulsification. Particularly, the method is as follows: the oil phase containing surfactant, membrane solvent and additive and dilute sulphuric acid are used to prepare emulsion under high speed shearing; the emulsion is dispersed in the wastewater with pyridine for mass transfer and extraction, the pyridine in the wastewater enters the liquid membrane phase, electrostatic demulsification is performed to generate pyridine sulfate which can be used in the production technology. In the process, the pyridine removal rate is more than 99% and the pyridine recovery rate is more than 90%. By adopting the method, the requirement that the emissions of the pyridine pollutants in wastewater meet the standards can be effectively realized. The method has obvious environmental benefit and economic benefit.

Description

technical field [0001] The invention belongs to the field of fine chemical production wastewater treatment, and in particular relates to a method for recovering pyridine from chemical production wastewater. Background technique [0002] Pyridine belongs to heterocyclic compounds, which are widely used in chemical, pharmaceutical and pesticide production industries. It has the characteristics of high toxicity and difficult biodegradation. Pyridine-containing wastewater is a difficult problem in fine chemical production wastewater treatment, and there is a lack of technically feasible and economically reasonable wastewater treatment methods. Chinese patent application CN1094717A introduces a method for recovering pyridine using azeotropic rectification technology. This method is only suitable for further refining of pyridine solutions with a concentration above 10%. If this method is used to recover pyridine from chemical production wastewater, a large amount of steam consump...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/06C02F1/26
Inventor 程迪李鹏欧云川刘艳张立君
Owner 中国中化股份有限公司
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