A kind of heterogeneous catalyst and the method for using it to prepare cyclocarbonate

A heterogeneous catalyst, cyclic carbonate technology, applied in catalytic reactions, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of improving reaction efficiency, good catalytic reaction effect, and large catalytic specific surface area

Active Publication Date: 2020-08-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Aiming at the aforementioned problems of the catalyst in the existing preparation method of cyclocarbonate, the present invention provides a new catalyst and a method for preparing cyclocarbonate with convenient product separation, high yield of cyclocarbonate and recyclable catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation and quaternization of styrene-divinylbenzene-vinyl chloride prepolymer.

[0057] Weigh 1 mol of styrene, 0.05 mol of divinylbenzene, and 0.1 mol of vinyl chloride, mix the above monomers evenly, and transfer them to 1# constant pressure titration device. Weigh 0.005 mol of azobisisobutyronitrile, dissolve it in 50 ml of toluene, and transfer it to 2# constant pressure titration device. Weigh 500mL of toluene in the reactor, replace the reaction system with nitrogen three times, and heat the reaction system to 60°C, 1# and 2# constant pressure titration devices start to drop at the same time, drop it completely in 30min, keep warm for 10h, and react Insoluble polymer particles or lumps appear in the system.

[0058] Weigh 0.12 mol of trimethylamine, add it to the above reaction system, react at 0.2MPa and 100°C for 24 hours, filter out the reaction solvent and dry the filter cake to obtain styrene-divinylbenzene-chloride containing quaternized groups Ethyle...

Embodiment 2

[0061] The monomer molar ratio of the quaternary ammonium salt immobilized catalyst is styrene:divinylbenzene:vinyl chloride:trimethylamine=100:5:10:12, and the specific preparation method is shown in Example 1. The weight average molecular weight of the quaternized prepolymer was 150746, and the molecular weight distribution was 3.2. The prepolymer is processed into a network shape to obtain the main catalyst, and the above-mentioned main catalyst is neatly packed in a tubular reactor.

[0062] Ethylene oxide: CO 2 : The molar ratio of NaBr is 1:3:0.0005. After the above raw materials are fully mixed, they are pressed into the reaction device. The internal reaction temperature of the reactor is 100°C, the reaction pressure is 5MPa, and the residence time of the reactant is 10min. After passing through the reactor, it enters Separation device to separate unreacted CO 2 , unreacted oxirane and cocatalyst NaBr, to obtain the finished product of cyclocarbonate, the structure is...

Embodiment 3

[0064] The monomer molar ratio of the quaternary ammonium salt immobilized catalyst is styrene:divinylbenzene:allyl chloride:triethylamine=100:10:15:19.5, and the specific preparation method is shown in Example 1. The weight average molecular weight of the quaternized prepolymer was 121045, and the molecular weight distribution was 3.4. The prepolymer is processed into a porous spherical shape to obtain the procatalyst, and the above procatalyst is neatly packed in a tubular reactor.

[0065] Propylene oxide: CO 2The molar ratio of :KBr is 1:4:0.0008. After the above raw materials are fully mixed, they are pressed into a tubular reactor. The internal reaction temperature of the tubular reactor is 110°C, the reaction pressure is 7MPa, and the residence time of the reactants is 20min. After the reactor, it enters the separation device to separate the unreacted CO 2 , unreacted propylene oxide and cocatalyst KBr, to obtain the finished product of cyclocarbonate, the structure i...

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Abstract

The invention provides a heterogeneous catalyst and a method for preparing cyclocarbonate using the same. The heterogeneous catalyst comprises a main catalyst and a cocatalyst, wherein the main catalyst is filled with a reactor in a regular manner. The main catalyst is a crosslinked polymer containing a quaternary ammonium salt group, and the active site in the catalyst is a quaternary ammonium salt group, which is chemically bonded to the crosslinked polymer and has the characteristic of adjustable quantity; the cocatalyst has a molecular formula MxLy, and is a halogenated metal salt. The method for preparing cyclocarbonate by reacting CO2 with alkylene oxide using the heterogeneous catalyst has the advantages that the product is convenient to separate, the yield of cyclocarbonate is high, and the catalyst can be recycled.

Description

technical field [0001] The invention belongs to the field of organic compound preparation, in particular to a preparation method of cyclocarbonate. [0002] Background of the invention [0003] As the final oxidation state of carbon, CO 2 With a certain chemical inertness, its properties are stable, non-toxic, and non-flammable. It is one of the most widely distributed and abundant carbon sources on the earth. At the same time, CO 2 It is also the main greenhouse gas on earth. CO in nature 2 The utilization is mainly the photosynthesis of plants, but its fixation of CO 2 The capacity is much smaller than the emission capacity of human activities, so CO 2 The chemical utilization and transformation of chemical compounds have gradually attracted people's attention and research. [0004] Cyclocarbonate and its derivative polymers are currently one of the few industrially applied CO fixatives. 2 one of the ways. On the one hand, cyclocarbonate has the characteristics of hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/30B01J35/10C07D317/36C07D317/38C07D317/44C07D317/46
CPCB01J31/28B01J31/30B01J35/10B01J2231/341C07D317/36C07D317/38C07D317/44C07D317/46Y02P20/584
Inventor 王涛范士敏冉千平马建峰亓帅王兵杨勇
Owner JIANGSU SOBUTE NEW MATERIALS
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