Catalyst for preparing dimethyl carbonate by using urea alcoholysis and preparation method thereof

A technology of dimethyl carbonate and catalyst, which is applied in the field of urea alcoholysis to prepare dimethyl carbonate catalyst and its preparation, can solve the problems of low reaction conversion rate, high price, product separation, etc., achieve simple preparation method and solve recovery difficulties , the effect of improving stability

Active Publication Date: 2009-12-09
PETROCHINA CO LTD
View PDF6 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon dioxide-methanol method mainly uses organometallic compounds as catalysts, which are expensive, have low reaction conversion rates, and are difficult to separate catalysts. The development of cheap, high-activity, and heterogeneous catalysts is the main direction of current research.
Although organotin compounds have good catalytic activity and product conversion rate, due to the high toxicity, high price, and difficulty in recovering homogeneous catalysts from products, the use of organotin compounds is affected.
[0005] CN1416949A has reported that zinc oxide is the main body, and 1~2 kinds of composite catalysts are formed in the oxides of lithium, magnesium, nickel, lead, aluminium, iron, mo

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
  • Catalyst for preparing dimethyl carbonate by using urea alcoholysis and preparation method thereof
  • Catalyst for preparing dimethyl carbonate by using urea alcoholysis and preparation method thereof
  • Catalyst for preparing dimethyl carbonate by using urea alcoholysis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] [Example 1] prepare 85wt% Zn(NO 3 ) 2 Solution 70ml, add the surfactant 1 of 0.05ml / l, adjust pH value 3.0. The Zn of 50wt% (NO 3 ) 2 Solution 50ml, add 0.1ml / l surfactant 2, adjust the pH value to 3.0. At room temperature, 60wt% Zn(NO 3 ) 2 The solution was impregnated onto 50 g of carrier 1, and impregnated at 60° C. for 2 hours. Raise the temperature from 80°C to 150°C at a constant speed and dry for 10 hours. 5 hours from room temperature to 500 ° C, constant temperature roasting for 3 hours. One-step impregnated catalyst with 50 wt% Zn(NO) 2 The solution was impregnated twice, dried and calcined at a constant temperature of 800°C for 3 hours. The composition of the obtained catalyst is 43.2wt% of zinc oxide and 56.8wt% of aluminum oxide, and the content distribution of the active components of the catalyst is shown in Table 5.

[0054] Table 5 Content distribution of catalyst active components

[0055] Location

[0056] Add 300ml of methanol an...

Embodiment 2

[0057] [embodiment 2] prepare respectively the Pb of 70wt% (NO 3 ) 2 Solution 50ml, add the surfactant 2 of 0.05ml / l, 40wt%Pb (NO3 ) 2 Solution 50ml, add 0.06ml / l surfactant 1, adjust the pH value to 3.0. 60wt% Pb(NO 3 ) 2 The solution was impregnated onto 50 g of carrier 2, and impregnated at a constant temperature of 60° C. for 2 hours. Raise the temperature from 80°C to 150°C at a constant speed and dry for 10 hours. Rising from room temperature to 500°C in 5 hours, and calcination at constant temperature for 5 hours. One-step impregnation of the catalyst with 40 wt% Pb(NO 3 ) 2 The solution was impregnated twice, dried, and baked at a constant temperature of 800° C. for 7 hours. The composition of the obtained catalyst is 31.2wt% of lead oxide and 68.8wt% of aluminum oxide, and the content distribution of the active components of the catalyst is shown in Table 6. Reaction in the autoclave, catalyst addition 16.8g, other conditions are with embodiment 1. The resul...

Embodiment 3

[0060] [Example 3] prepare 60wt% Ca(NO 3 ) 2 Solution 75ml, add the surfactant 3 of 0.03ml / l, 40wt% Ca (NO 3 ) 2 Solution 50ml, add 0.04ml / l surfactant 3, all adjust the pH value to 4.0. 60wt% Ca(NO 3 ) 2 The solution was impregnated onto 50 g of carrier 3, and impregnated at a constant temperature of 60° C. for 2 hours. Raise the temperature from 80°C to 150°C at a constant speed and dry for 10 hours. Rise from room temperature to 500°C in 5 hours, and roast at constant temperature for 3.5 hours. One-step impregnated catalyst with 40wt% Ca(NO 3 ) 2 The solution was impregnated twice, dried, and baked at a constant temperature of 800° C. for 7 hours. The composition of the catalyst is 29.6wt% of calcium oxide and 70.4wt% of alumina, and the content distribution of the active components of the catalyst is shown in Table 7. Reaction in the autoclave, catalyst addition 18.8g, other conditions are with embodiment 1. The results are shown in Table 19.

[0061] Table 7 C...

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 provides a catalyst for preparing dimethyl carbonate by using urea alcoholysis and a preparation method thereof. The catalyst has a specific surface area of 150-350 m/g, a specific pore volume of 0.5-2.0 cm/L and the pore-size distribution of 50-150, gamma-Al2O3 as a carrier accounts for 50-80 percentage of the catalyst by weight, and the balance comprises active constituents. The main active constituent comprises at least one of ZnO, CaO and PbO, and an active constituent oxide and an alumina carrier can form a stable spinelle structure. The catalyst has good stability, can achieve the stable operation service life longer than 500 hours, reacts with a urea methanol solution to synthesize the dimethyl carbonate with higher catalytic activity, has the simple preparation method, can finish load without special equipment, is beneficial to industrialized amplification, is a fixedly-carrier catalyst and solves the problem that the prior homogeneous catalyst is difficult to recycle.

Description

technical field [0001] The invention relates to a catalyst for producing dimethyl carbonate by alcoholysis of urea and a preparation method thereof, in particular to a supported metal oxide catalyst for producing dimethyl carbonate by reacting urea and methanol and a preparation method thereof. Background technique [0002] Dimethyl carbonate is an organic chemical with various reactivity and environmental friendliness. It can replace highly toxic phosgene and dimethyl sulfate for carbonylation, methylation, methoxylation and other reactions. The nature of the reaction has been paid more and more attention in recent years. At present, the mature synthesis methods of dimethyl carbonate mainly include phosgene method, oxidative carbonylation method and transesterification method. However, the process of phosgene method is complicated, the raw materials are highly toxic, and the by-product HCl seriously corrodes the equipment; the by-product water of the liquid-phase oxidative...

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): B01J23/06B01J23/14B01J23/02B01J23/10B01J23/34C07C69/96C07C68/00
CPCY02P20/584
Inventor 梁玉龙王继龙王涛辛国萍颉伟陈红陈跟平张茵龚光碧
Owner PETROCHINA CO LTD
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