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Preparing method and application of core-shell material catalyst

A catalyst and core-shell technology, which is applied in the field of preparation of new core-shell material catalysts, can solve problems such as difficult to break thermodynamics, and achieve the effects of repeated use, controllable morphology, and easy availability of raw materials

Active Publication Date: 2016-01-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcoming that carbamate and phenol transesterification synthesis diphenyl carbonate thermodynamics is difficult to break through, and prepare a kind of diphenyl carbonate that is cheap and easy to obtain, has high catalytic efficiency and many times of repeated use. Core-shell material catalysts for phenyl ester synthesis

Method used

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  • Preparing method and application of core-shell material catalyst
  • Preparing method and application of core-shell material catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: The method for preparing the zinc chloride catalyst coated with molecular sieves is as follows:

[0021] (1) Add 10mmol of anhydrous zinc chloride to a conical flask with 20mL of methanol as a solvent and a magnetic stirrer, and then add polyethylene glycol to the zinc chloride solution at the ratio of 100mg of surfactant to 1mL of the solution. Glycol, stirred for 10 minutes to make the whole solution system fully mixed; pass into ammonia gas containing 20% ​​ammonia until the color of the solution no longer changes, and the precipitate obtained at this time is the saturated ammonia complex of zinc chloride, and the mixed solution Use a high-speed centrifuge to centrifuge, filter, and vacuum-dry at 50°C to obtain a solid powder of zinc ammonium chloride, and use a conventional Zeta potential analyzer to determine that the solid surface of zinc ammonium chloride is negatively charged;

[0022] (2) Preparation of molecular sieves

[0023] ① Press SiO2 2 :...

Embodiment 2

[0032] Embodiment 2: the method for preparing the cadmium chloride catalyst coated with molecular sieves is as follows:

[0033] (1) Add 8mmol of anhydrous cadmium chloride to a conical flask with 20mL of absolute ethanol as a solvent and a magnetic stirrer, and then add polyol to the cadmium chloride solution at the ratio of 1mL to 50mg of surfactant. Vinyl alcohol, stirred for 10 minutes to fully mix the entire solution system; pass through ammonia gas with an ammonia content of 20% until the color of the solution no longer changes, and the precipitate obtained at this time is the saturated ammonia complex of cadmium chloride. Use a high-speed centrifuge to centrifuge, filter, and vacuum-dry at 50°C to obtain cadmium chloride solid powder, and use a conventional Zeta potential analyzer to determine that the surface of the ammonium cadmium chloride solid is positively charged;

[0034] (2) The synthesis method of molecular sieve refers to the patent literature, and the specif...

Embodiment 3

[0044] Embodiment 3: the method for preparing the cobalt chloride catalyst coated with molecular sieve is as follows:

[0045] (1) Add 6mmol of anhydrous cobalt chloride to a 20mL conical flask with ethylene glycol as a solvent and a magnetic stirrer, and then add ten Hexaalkyltrimethylammonium bromide, stirred for 10 minutes to fully mix the entire solution system; pass through ammonia gas with an ammonia content of 20% until the color of the solution no longer changes, and the precipitate obtained at this time is saturated with cobalt chloride Ammonia complexes, the mixed solution is centrifuged with a high-speed centrifuge, filtered, and vacuum-dried at 50°C to obtain the cobalt ammonium chloride solid powder, which is determined to be negatively charged on the surface of the cobalt ammonium chloride solid by using a conventional Zeta potential analyzer;

[0046] (2) The preparation method of molecular sieve refers to relevant patent documents, and the specific implementati...

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Abstract

The invention discloses a preparing method and application of a core-shell material catalyst. The catalyst nuclear material is obtained after the surface of chlorine ammonium salt is coated with a layer of zeolite membrane in an electrostatic mode with the layer by layer self-assembly method under the electrostatic interaction of positive and negative polyelectrolytes, the target product catalyst obtained after ammonia gas is separated out through low-temperature roasting can be used in a system for generating diphenyl carbonate through transesterification between urea or carbamic acid ester and phenol, complex adsorption can be achieved between the catalyst and ammonia gas generated by the reaction system so as to push reaction to move rightwards, the yield of diphenyl carbonate is over 90%, a good catalytic effect can still be realized after five times of usage, separation and recovery are easy, and selectivity is high.

Description

technical field [0001] The invention belongs to the preparation method and application of a diphenyl carbonate synthesis catalyst, and specifically relates to a novel catalyst for the synthesis of diphenyl carbonate from urea or carbamate and phenol with high catalytic efficiency, low price and good reproducibility. Preparation method of core-shell material catalyst. Background technique [0002] Diphenyl Carbonate (DiphenylCarbonate, referred to as DPC) molecular formula is C 6 h 5 OCOOC 6 h 5 , is a "green" intermediate for the synthesis of organic compounds and polymer materials, mainly used in the plastics industry, and one of its most notable uses is the polycondensation reaction with bisphenol A to synthesize polycarbonate (PC), because polycarbonate Ester has excellent optical properties, high impact strength, high-quality thermal stability and other outstanding properties, making DPC widely used in the fields of eyeglasses, aerospace, automobile manufacturing, pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/76B01J29/78C07C69/96C07C68/00
Inventor 赵文波冯东农洁静张政陈媛李艳红
Owner KUNMING UNIV OF SCI & TECH
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