Catalyst used for synthesizing diethyl carbonate from urea and ethanol, preparation method and application thereof

A technology of diethyl carbonate and catalyst, which is applied in the field of solid base catalyst and its preparation, can solve the problems of environmental pollution, toxicity, and easy loss, and achieve the effects of easy separation and recovery, high catalytic activity, and simple preparation

Active Publication Date: 2015-01-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are more or less deficiencies in economy and technology: the phosgene method, the raw material phosgene is highly toxic, and the by-product hydrochloric acid corrodes the equipment, causing serious environmental pollution; the oxidative carbonylation method of ethanol, CO is poisonous, and the reaction material is flammable Explosive; transesterification method, high cost of raw material DMC, poor selectivity
Zhao Xinqiang et al. (NO.CN101659616A) used oxides or composite oxides such as lead and zinc to catalyze the alcoholysis of urea to synthesize DEC. The highest yield of DEC was 20%. The catalyst used was highly toxic and easily lost, which was not conducive to industrial application.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 25.981g La(NO 3 ) 3 In a beaker, add 400mL deionized water, stir and heat to 60°C, add ammonia water dropwise until the pH value is 9-10, continue to stir for 3 hours, age, filter and wash until neutral, dry at 80°C, and calcine at 500°C for 4 hours . Prepared solid base La 2 o 3 .

Embodiment 2

[0026] In the autoclave, add 2.060g urea, 20mL absolute ethanol, the catalyst prepared in 0.350g example 1, exhaust the air in the kettle with nitrogen, stir and heat up, control the reaction temperature to be 210°C, the pressure is 2.2MPa, and the rotating speed is 550r / min, reacted for 3 hours, the obtained results are shown in Table 1.

Embodiment 3

[0028] Take 50mL of deionized water and heat it to 65°C, slowly add 0.15mol of Mg(NO 3 ) 2 and 0.05mol of AL(NO 3 ) 3 The mixed solution of 150mL, 2.0mol / L (NH 4 ) 2 CO 3 Solution 150mL, adjust the pH value between 9-10 with 25% ammonia water after the dropwise addition, stir and react at 65°C for 3 hours, filter, wash until neutral, dry at 100°C for 12 hours, and then calcined at 450°C for 3 hours . Prepared solid base Mg x AL y o x+3y / 2 (x:y=1:1‐3:1).

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 relates to a catalyst used for synthesizing diethyl carbonate from urea and ethanol. The catalyst is a solid alkaline catalyst and is prepared through a precipitation method or a coprecipitation method. A preparation method includes following steps: preparing an aqueous solution from soluble metal salt of alkaline-earth metals, transition metals and other metals; adding dropwisely a certain amount of a precipitating agent with a pH value being adjusted to between 8-12 to obtain a precursor; drying the precursor at 50-150 DEG C for 2-24 hours; and then calcining the precursor at 200-1000 DEG C for 2-10 hours. The catalyst is simple in preparation, is high in activity, is environmental-friendly, is easy to separate and recycle and is good in stability.

Description

[0001] technology field, [0002] The invention relates to a catalyst and its preparation method and application, in particular to a solid base catalyst for synthesizing diethyl carbonate from urea and ethanol, its preparation method and application. technical background [0003] Diethyl carbonate, referred to as DEC, contains carbonyl, ethoxy, and ethyl groups in the molecule, which have good reactivity. A series of important organic chemical products are derived from the reaction. DEC itself is a low-toxic substance, which will slowly hydrolyze when released into the environment to generate ethanol and carbon dioxide, and will not pollute the environment. Therefore, it is an environmentally friendly chemical. It is used in solvents, electrolytes, organic synthesis, pharmaceuticals and engineering plastics, etc. Fields are widely used. The oxygen content of 40.6% of diethyl carbonate is much higher than that of methyl tert-butyl ether (MTBE) (18.2%). As an oxygen-containing...

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): B01J23/10B01J21/10C07C69/96C07C68/00
Inventor 李会泉辛淑敏王利国李凤姣曹妍
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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