Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing n,n'-bis(2-cyanoethyl)-1,2-ethylenediamine

A cyanoethyl and ethylenediamine technology is applied in the field of preparation for improving the yield of N,N'-bis-1,2-ethylenediamine, and can solve the problems of hindering the commercial application of the preparation method, equipment corrosion and the like, and achieves The effect of saving cost and reducing environmental pollution

Inactive Publication Date: 2017-06-06
NANYA PLASTICS CORP
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of acetic acid in the preparation process will cause equipment corrosion, which hinders the commercial application of this preparation method

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 preparing n,n'-bis(2-cyanoethyl)-1,2-ethylenediamine

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation method of N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine of the present invention comprises the following steps:

[0014] a. in reactor (for example three-neck round bottom flask), add the alcohol ether based on total reactant weight 10-51.04wt%, preferably the alcohol ether of 30-51.04wt%; More preferably the alcohol ether of 47wt%;

[0015] b. Under stirring, add ethylenediamine into the alcohol ether solution of step a and stir evenly;

[0016] c. At a temperature of 25-70°C, preferably at a temperature of 30-65°C, add acrylonitrile dropwise according to the molar ratio of ethylenediamine to acrylonitrile 1:1.9-2.1 (preferably 1:2.0), and the dropping temperature must not More than 70°C, because acrylonitrile is prone to self-polymerization when the temperature exceeds 70°C;

[0017] d. After the dropwise addition, at a temperature of 25-70°C, preferably at a temperature of 30-65°C, keep the reaction going on for 2.5-24 hours, and detect that the convers...

Embodiment 1

[0026] Add 12.002 grams (0.2 mol) of ethylenediamine (hereinafter referred to as EDA) and 30.000 grams of propylene glycol monomethyl ether (PM) into a 250 mL three-necked flask equipped with a condenser tube and a mechanical stirrer. At room temperature, 21.827 g (0.411 mol) of acrylonitrile (hereinafter referred to as ACN) was added dropwise, and the dropwise addition process was less than 2 hours, and the temperature was controlled below 70°C. After ACN has been added dropwise, continue to react for 24 hours at 25°C, and detect that the EDA conversion rate reaches 100% with gas chromatography (hereinafter referred to as GC). After the reaction finishes, analyze the composition of the reaction product, and the results are as shown in Table 1. The yield of N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine (hereinafter referred to as BCNEDA) was 98.98%.

Embodiment 2

[0028] Add 12.002 g (0.2 mol) of EDA and 30.000 g of PM into a 250 mL three-necked flask equipped with a condenser and a mechanical stirrer. At 60°C, 21.827 g (0.411 mol) of ACN was added dropwise, and the dropwise addition process was less than 2 hours, and the temperature was controlled below 70°C. After the ACN was added dropwise, the reaction was continued for 2.5 hours at 65°C, and the conversion rate of EDA was detected to reach 100% by GC. After the reaction, the composition of the reaction product was analyzed. The results were shown in Table 1. 98.46%.

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
process yieldaaaaaaaaaa
conversion efficiencyaaaaaaaaaa
process yieldaaaaaaaaaa
Login to View More

Abstract

A method for preparing N,N'-bis(2-cyanoethyl-1,2-ethylenediamine involves using glycol ether as a catalyst for synthesis reaction in which ethylenediamine and acrylonitrile at a molar ratio of 1:1.9-2.1 are reactant that react at 20-70 DEG C to prepare N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine; the method improves the yield to 98.15-98.98%; and the used glycol ether may be filtered and recycled, thereby saving costs and reducing environmental pollution.

Description

technical field [0001] The present invention relates to N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine, in particular to a method for improving N,N'-bis(2-cyanoethyl)-1,2- Preparation method of ethylenediamine yield. Background technique [0002] The traditional method for preparing N,N′-bis(2-cyanoethyl)-1,2-ethylenediamine is to use acetic acid, water, monohydric alcohols or other additives as a catalyst for the synthesis reaction, but the use of acetic acid will The problem of equipment corrosion is caused, and the use of other solvents cannot effectively improve the yield of N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine. [0003] For example, DE2446489 disclosed in 1976 that acrylonitrile and ethylenediamine were taken at a molar ratio of about 2:1, within 2 hours, acrylonitrile was added to ethylenediamine (EDA), and acetic acid was included in the acrylonitrile as catalyst. According to its description, the obtained product can be distilled to obtain N,N'-bis(2-cyanoethyl)...

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): C07C253/30C07C255/24B01J31/02
CPCB01J31/0204C07C253/30B01J2231/32C07C255/24C07C253/18
Inventor 廖德超庄荣仁黄志铭陈顺基林自强
Owner NANYA PLASTICS CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com