A kind of amorphous double metal cyanide catalyst and its preparation method and application

A double metal cyanide and catalyst technology, which is applied in the field of amorphous double metal cyanide catalyst and its preparation, can solve the problem that the copolymerization product cannot take into account high carbonate unit content, low cyclic carbonate content, low molecular weight distribution and the like at the same time , to achieve the effect of great practical application value and market prospect, promotion activity and catalytic activity enhancement

Active Publication Date: 2019-07-02
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the above-mentioned double metal cyanide catalyst catalyzes the copolymerization reaction of carbon dioxide and epoxy derivatives, the copolymerization product cannot simultaneously take into account high carbonate unit content, low cyclic carbonate content, high catalytic efficiency and low molecular weight distribution

Method used

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  • A kind of amorphous double metal cyanide catalyst and its preparation method and application
  • A kind of amorphous double metal cyanide catalyst and its preparation method and application
  • A kind of amorphous double metal cyanide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the DMC-1 of cyclohexane-water inverse microemulsion system

[0026] The preparation method comprises the following steps:

[0027] (1) Measure 108ml of cyclohexane and 2.16mL of water to prepare a reverse microemulsion, add 10.2mL Triton X-100 and 7.75mL of tert-butanol, and add them to a three-necked flask to prepare a microemulsion for later use.

[0028] (2) Weigh 1.36g ZnCl 2 (1×10 -2 mol) and 0.66g K 3 [Co(CN) 6 ] 2 (2×10 -3 mol) were dissolved in 2 mL of deionized water and added to the above system respectively to obtain mixed solutions A and B.

[0029] (3) Slowly add the mixed solution B to the mixed solution A under the condition of stirring at 333K, and control the dropping speed at 5-10 seconds / drop. React in the ultrasonic field for 2h.

[0030](4) then the above-mentioned mixed solution was centrifuged at a rotating speed of 10000r / min for 10 minutes to separate the precipitate, and the solid powder obtained carried out Soxhlet extra...

Embodiment 2

[0032] The catalyst preparation method is basically the same as in Example 1, except that the cyclohexane in Example 1 is replaced by heptane in equal volume, and the prepared catalyst is marked as DMC-2.

Embodiment 3

[0034] The preparation method of the catalyst is basically the same as in Example 1, except that the equivalent volume of cyclohexane in Example 1 is replaced by benzene, and the prepared catalyst is marked as DMC-3.

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Abstract

The invention discloses amorphous duplex-metal cyanide catalyst and a preparation method and application thereof. The catalyst is a three-dimensional net-shaped amorphous complex, the complex is prepared from internal metal MII and external metal MI, and the internal metal MII and the external metal MI are connected through a cyano group. The preparation method comprises the steps: mixing an oil phase with a water phase to be prepared into reversed-phase microemulsion, adding a surface active agent and a cosurfactant, adding a precursor zinc chloride and metal cyanide respectively, evenly stirring to prepare mixed solution A and mixed solution B, the adding the mixed solution B into the mixed solution A, performing ultrasonic reaction, separating, performing soxhlet extraction washing and drying. The catalyst has the advantages of having a higher specific surface area, enlarging a contact area with a substrate, increasing active sites and enhancing catalytic activity. The preparation method is simple and environment-friendly and reduces production cost. In addition, the catalyst is applied to catalytic copolymerization reaction, the carbonic ester unit content of the obtained copolymer is high, the cyclic carbonate content is low, and the obtained copolymer has a lower molecular weight.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to an amorphous double metal cyanide catalyst and its preparation method and application Background technique [0002] Carbon dioxide is one of the chief culprits of the greenhouse effect, accounting for the largest proportion of greenhouse gases. At the same time, carbon dioxide is non-toxic, stable and easy to recover, and can be used as a rich C1 resource. At present, the capture and utilization of carbon dioxide has become a focus topic. Among them, the degradable aliphatic polycarbonate synthesized by copolymerization of carbon dioxide and epoxy derivatives has a good development prospect. Since its inception (Polymer Science Polymer Letters, 1969, 7, 287), it has received widespread attention from scientists, and has developed a variety of catalytic systems, such as: diethyl zinc / polyproton catalysts, metal carboxylate systems, rare earth three Element system, metal porphyrin syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34
CPCC08G64/34
Inventor 许琦周钰仓辉蔡照胜唐喆
Owner YANCHENG INST OF TECH
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