Impurity extraction method for caprolactam production

A caprolactam and extraction technology is applied in the directions of separation/purification of lactam, chemical instruments and methods, liquid solution solvent extraction, etc., can solve problems such as high cost and unsatisfactory extraction effect, and achieves convenient operation, easy implementation and simple structure. Effect

Inactive Publication Date: 2011-11-09
CHINA PETROLEUM & CHEM CORP
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary technical problem to be solved by the present invention is to provide a new process for liquid-liquid solvent extraction in view of the existing background technology, to ove

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
  • Impurity extraction method for caprolactam production
  • Impurity extraction method for caprolactam production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Attached figure 1 In the extraction process shown, the volume flow rate of wastewater containing caprolactam is 6.0m 3 / h, the content of caprolactam is 48%, the water content is about 50%, the rest is ammonium sulfate and organic impurities, and the density of the mixture is 1028kg / m 3 , the temperature is 40±5℃. Benzene volume flow rate 36.0mm 3 / h, density 872kg / m 3 , the temperature of the centrifugal extraction and separation is 40°C, the rotational speed of the motor of the centrifugal extraction separator is 1200r / min, and the operating pressure of the centrifugal extraction separator is: 0.01-0.20MPa.

[0023] Caprolactam content adopts gas chromatography, referring to DSM385-E and 385-02-E and DSM657-E. After extraction, the content of caprolactam in the waste water is less than 0.5% (weight ratio), and the content of unsaturated benzene in the waste water is not more than 0.1% (weight ratio).

Embodiment 2

[0025] Attached figure 2 In the extraction process shown, the volume flow rate of wastewater containing caprolactam is 6.0 m 3 / h, the content of caprolactam is 48%, the water content is about 50%, the rest is ammonium sulfate and organic impurities, and the density of the mixture is 1028kg / m 3 , the temperature is 40±5℃. Benzene volume flow rate 36.0 m 3 / h, density 872kg / m 3 , the temperature of the centrifugal extraction and separation is 40°C, the rotational speed of the motor of the centrifugal extraction separator is 1200r / min, and the operating pressure of the centrifugal extraction separator is: 0.01-0.20MPa.

[0026] Caprolactam content adopts gas chromatography, referring to DSM385-E and 385-02-E and DSM657-E. After extraction, the content of caprolactam in the waste water is less than 0.3% (weight ratio), and the content of unsaturated benzene in the waste water is not more than 0.1% (weight ratio).

Embodiment 3

[0028] Attached figure 1 For the extraction process shown, the volumetric flow rate of wastewater containing caprolactam is 3.5 m 3 / h, the content of caprolactam is 48%, the water content is about 50%, the rest is ammonium sulfate and organic impurities, and the density of the mixture is 1028kg / m 3 , the temperature is 40±5℃. Benzene volume flow rate 15.0 m 3 / h, density 872kg / m 3 , the temperature of the centrifugal extraction and separation is 40°C, the rotational speed of the motor of the centrifugal extraction separator is 900r / min, and the operating pressure of the centrifugal extraction separator is: 0.01-0.20MPa.

[0029] Caprolactam content adopts gas chromatography, referring to DSM385-E and 385-02-E and DSM657-E. After extraction, the content of caprolactam in the waste water is less than 0.7% (weight ratio), and the content of unsaturated benzene in the waste water is not more than 0.2% (weight ratio).

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
Densityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a novel impurity extraction method of a caprolactam device. The impurity extraction method is characterized by firstly introducing caprolactam-containing wastewater into a tower type extraction device, and extracting and separating with benzene; secondly introducing the residual liquid after extraction of the tower type extraction device into a centrifugal extraction device for deep extraction; and finally introducing the wastewater rich in water-soluble impurities after extraction into a gas stripping tower. The impurity extraction method disclosed by the invention can effectively solve the problem that the extraction effect is not good in the prior art and achieve the purpose of deep extraction, and is suitable for liquid-liquid solvent extraction in the fields of atomic energy chemical industry, pharmacy, hydrometallurgy, petrochemical industry and the like.

Description

technical field [0001] The invention relates to a new method for solvent extraction of waste water containing caprolactam in the impurity extraction process in caprolactam production by using extraction tower and centrifugal extraction technology series combination technology, which can effectively solve the problem of unsatisfactory extraction effect in the prior art and achieve deep extraction. Purpose. It is suitable for liquid-liquid solvent extraction in the fields of atomic energy chemical industry, hydrometallurgy, pharmaceutical and petrochemical industries. Background technique [0002] Caprolactam (CPL) is an important organic chemical raw material, mainly used as a raw material for the production of polyamide 6 engineering plastics and polyamide 6 fibers. In addition, caprolactam can also be used for the production of antiplatelet drug 6-aminocaproic acid, lauryl azepine Ketones, etc., are widely used. Although the production of caprolactam in my country has inc...

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): C07D223/10C07D201/16B01D11/04
Inventor 白志山瞿亚平卢世健旷志刚吴望成唐康汪华林
Owner CHINA PETROLEUM & CHEM CORP
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