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Solid catalyst and catalytic preparation method of propylene carbonate by using solid catalyst

A technology of solid catalyst and propylene carbonate, which is applied in the field of chemical industry, can solve the problems of difficult separation of alkali metal catalysts, expensive catalysts, high catalyst concentration, etc., and achieve the effects of high catalytic effect, low production cost, and simple and feasible method

Inactive Publication Date: 2017-02-08
安徽金邦医药化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems in the above catalyst systems: for example, organometallic complex catalyst systems require high catalyst concentration and low conversion rate; quaternary ammonium salt and quaternary phosphonium salt catalysts are expensive; alkali metal catalysts are not easy to separate, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the method for catalytically preparing propylene carbonate

[0019] Put urea and 1,2-propanediol into the reactor at a molar ratio of 1:3, and react in the presence of a solid catalyst. The catalyst dosage is 4wt% of urea, the reaction temperature is 150°C, and the reaction time is 1.5h. After the reaction is completed, Stirring was stopped, and after cooling, the target product propylene carbonate was obtained through distillation and separation.

[0020] The solid catalyst uses modified attapulgite as a carrier, copper nitrate as a precursor, and copper oxide is loaded on the modified attapulgite through the methods of immersion, drying and roasting; the preparation method of modified nano attapulgite is as follows: taking nanometer 35 parts of attapulgite were dispersed in 50 parts of triethylenetetramine with a mass fraction of 10%, stirred at 45°C for 30 min, and then 10 parts of Zn(NO 3 ) 2 ·6H 2 O, stirred for 25min, filtered and dried after coo...

Embodiment 2

[0025] Embodiment 2: the method for catalytically preparing propylene carbonate

[0026] Put urea and 1,2-propanediol into the reaction kettle at a molar ratio of 1:2, and react in the presence of a solid catalyst. The catalyst dosage is 2wt% of urea, the reaction temperature is 120°C, and the reaction time is 2.5h. After the reaction is completed, Stirring was stopped, and after cooling, the target product propylene carbonate was obtained through distillation and separation.

[0027] The solid catalyst uses modified attapulgite as a carrier, copper nitrate as a precursor, and copper oxide is loaded on the modified attapulgite through the methods of immersion, drying and roasting; the preparation method of modified nano attapulgite is as follows: taking nanometer 30 parts of attapulgite were dispersed in 45 parts of triethylenetetramine with a mass fraction of 5%, stirred at 40°C for 35 minutes, and then 5 parts of Zn(NO 3 ) 2 ·6H 2 O, stirred for 20min, filtered and drie...

Embodiment 3

[0032] Embodiment 3: the method for catalyzed preparation of propylene carbonate

[0033] Put urea and 1,2-propanediol into the reactor at a molar ratio of 1:4, and react in the presence of a solid catalyst. The catalyst dosage is 6wt% of urea, the reaction temperature is 180°C, and the reaction time is 0.5h. After the reaction is completed, Stirring was stopped, and after cooling, the target product propylene carbonate was obtained through distillation and separation.

[0034] The solid catalyst uses modified attapulgite as a carrier, copper nitrate as a precursor, and copper oxide is loaded on the modified attapulgite through the methods of immersion, drying and roasting; the preparation method of modified nano attapulgite is as follows: taking nanometer 40 parts of attapulgite were dispersed in 55 parts of triethylenetetramine with a mass fraction of 15%, stirred at 50°C for 25 minutes, and then 15 parts of Zn(NO 3 ) 2 ·6H 2 O, stirred for 30min, filtered and dried aft...

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Abstract

The present invention discloses a solid catalyst and a catalytic preparation method of propylene carbonate by using the solid catalyst. According to the technical scheme of the invention, the modified attapulgite is adopted as a carrier, and the copper nitrate is adopted as a precursor. The copper oxide is loaded onto the modified attapulgite through the dipping, drying and roasting process. The preparation method of the modified nano-attapulgite comprises the following steps of dispersing 30-40 parts of nano attapulgite into 45-55 parts of 5-15 wt% of triethylene tetramine, stirring at 40-50 DEG C for 25-35 minutes, adding 5-15 parts of Zn(NO3)2*6H2O, stirring for 20-30 minutes, cooling, filtering and drying. The solid catalyst is stable in property and high in catalytic effect, which can be repeatedly used. The catalytic preparation method of propylene carbonate by using the solid catalyst is simple, feasible, and low in production cost.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a solid catalyst and a method for preparing propylene carbonate by catalyzing it. Background technique [0002] Propylene carbonate is an important organic chemical, widely used in organic synthesis, gas separation, electrochemistry, polymer synthesis, printing and dyeing, plastics and other fields. The traditional synthesis methods of propylene carbonate mainly include phosgene method, transesterification method, urea alcoholysis method, propylene oxide and carbon dioxide cycloaddition method. The phosgene method is banned because the phosgene in the raw material is highly toxic, causing serious harm to people and the environment; the transesterification method is generally not used in industrial production because the catalyst used is poisonous and the raw material is expensive; the urea alcoholysis method is generally used because the catalyst used is not easy to s...

Claims

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Application Information

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IPC IPC(8): B01J23/80C07D317/36
CPCB01J23/80C07D317/36
Inventor 曹金龙
Owner 安徽金邦医药化工有限公司
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