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Preparation method for load type TiO2 catalyst for ester exchange compound diphenyl oxalate

A diphenyl oxalate, supported technology, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as cumbersome preparation process, and achieve low energy consumption, no corrosion of equipment, and operation. mild conditions

Active Publication Date: 2016-11-09
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

CN200810050203.6 reports a series of organic acid catalysts, organic base catalysts and immobilized organic acid-base dual-function catalysts, but the preparation process is relatively cumbersome

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  • Preparation method for load type TiO2 catalyst for ester exchange compound diphenyl oxalate

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preparation example Construction

[0020] Supported TiO used in the synthesis of diphenyl oxalate by transesterification of the present invention 2 The preparation method of catalyst, step is as follows,

[0021] 1) Weighing a certain amount of titanium source and dissolving it in absolute ethanol, stirring thoroughly, to obtain an impregnation solution; the titanium source is tetraethyl titanate, tetraisopropyl titanate or tetrabutyl titanate. The purpose of using absolute ethanol is to better realize the dispersion of the titanium source, so that the speed of the subsequent hydrolysis of the titanium source can be eased. Theoretically speaking, the more absolute ethanol is added, the more dispersed the titanium source, the slower the subsequent hydrolysis rate, and the relatively more uniform and finer the prepared catalyst. But from the perspective of laboratory or cost saving, absolute ethanol is mostly 5-100 times (molar ratio) of titanium source.

[0022] Reasons for choosing anhydrous ethanol to dissol...

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Abstract

The invention discloses a preparation method for a load type TiO2 catalyst for ester exchange compound diphenyl oxalate. The preparation method comprises the following steps: 1) weighting a certain amount of titanium source, dissolving in absolute ethyl alcohol, fully stirring and acquiring a maceration extract; 2) mixing and stirring the treated carrier and the maceration extract for 3h, and then starting to dropwise add a certain amount of deionized water and further full stirring, thereby acquiring a mixed solution; adding the carrier according to the mass fraction of TiO2 being 1-30% in the lastly acquired load type TiO2 catalyst; 3) standing by the mixed solution acquired in the step 2 for 24h-48h, thereby acquiring solid powder; 4) drying the solid powder for 5-10h at 80-150 DEG C, sending into a plasma generating device and treating for 3-120min, thereby acquiring the load type TiO2 catalyst. The preparation method has the advantages of mild operation and simple process. The prepared catalyst is high in selectivity and high in activity.

Description

technical field [0001] The present invention relates to TiO 2 Catalyst preparation, specifically referring to transesterification synthesis of diphenyl oxalate with supported TiO 2 The invention relates to a preparation method of the catalyst. The catalyst is used for the catalytic preparation of MPO and DPO, which are raw materials for the synthesis of DMO and phenol to produce DPC under heterogeneous conditions, and belongs to the technical field of chemical industry. Background technique [0002] DPC is an important green chemical intermediate, which can be used to synthesize many important organic compounds and polymer materials, especially polycarbonate, which can replace phosgene and bisphenol A to synthesize one of the five major engineering plastics, so it has a high Economic Value. At present, the synthesis methods of DPC mainly include phosgene method, phenol carbonylation method, urea method, transesterification method and so on. Among them, transesterification...

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Application Information

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IPC IPC(8): B01J21/08B01J37/34C07C67/02C07C69/36
CPCB01J21/08B01J37/349C07C67/02C07C69/36
Inventor 余晓鹏
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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