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A method for continuously preparing propylene (or vinyl) carbonate

A technology of ethylene carbonate and propylene carbonate, which is applied in the field of preparing propylene carbonate or ethylene carbonate, can solve the problems of catalyst performance impact, no propylene (or ethylene) carbonate, catalyst instability, etc.

Active Publication Date: 2018-07-10
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because metal carbonates are easy to decompose and form oxides under high temperature reaction conditions, the catalyst is unstable and the performance of the catalyst is affected.
[0005] Therefore, in the prior art, still do not see the method that adopts urea, propylene (or ethylene) glycol to stably and continuously prepare propylene carbonate (or ethylene) ester

Method used

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  • A method for continuously preparing propylene (or vinyl) carbonate
  • A method for continuously preparing propylene (or vinyl) carbonate
  • A method for continuously preparing propylene (or vinyl) carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0033]The reactor consists of two reactive distillation columns connected in series. In the mixing and dissolving tank, propylene glycol is fed at a rate of 155.2kg / h, urea at 81.7kg / h, and catalyst metal oxide at a rate of 1.65kg / h. After mixing, it is continuously added to the first reactive distillation tower with a pump. The temperature of the material in the reactive distillation column is forced to circulate into the reboiler for heating by means of a pump. The heating temperature of the material is 150°C and the operating pressure is 40kPa. The liquid level in the first reactive distillation column is kept stable so that the residence time in the first reactive distillation column is 1 h. Part of the material in the first reactive distillation tower enters the second reactive distillation tower through a pump, and the material in the second reactive distillation tower is forced to circulate into the reboiler to be heated by a pump. The heating temperature of the materia...

Embodiment 2

[0035] The reactor consists of two reactive distillation columns connected in series. In the mixing and dissolving kettle, ethylene glycol is fed at a rate of 337.7kg / h, urea at a rate of 163.4kg / h, and catalyst metal oxide at a rate of 5.01kg / h. After mixing, it is continuously added to the first reactive distillation tower with a pump. The temperature of the materials in the first reactive distillation column is forced to circulate into the reboiler to be heated by a pump, the heating temperature of the materials is 155°C, and the operating pressure is 50kPa. Keep the liquid level in the first reactive distillation column stable so that the residence time in the first reactive distillation column is 1.5 h. Part of the material in the first reactive distillation tower enters the second reactive distillation tower through a pump, and the material in the second reactive distillation tower is forced to circulate into the reboiler to be heated by a pump. The heating temperature o...

Embodiment 3

[0037] The reactor has only one reactive distillation column. In the mixing and dissolving tank, feed propylene glycol at 155.2kg / h, urea at 81.7kg / h, and catalyst metal oxide at a rate of 1.65kg / h. After mixing, use a pump to continuously add to the reactive distillation tower. The temperature of the material in the boiler is forced to circulate into the reboiler for heating by means of a pump. The heating temperature of the material is 170°C and the operating pressure is 40kPa. Keep the liquid level in the reactive distillation column stable so that the residence time in the first reactive distillation column is 4h. Part of the material in the reactive distillation column enters the subsequent catalyst filter through the pump, and the catalyst is separated for recycling. The material after separating the catalyst is a mixture of propylene glycol and propylene carbonate, which can be separated by conventional rectification methods. Through analysis and calculation, the conv...

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Abstract

The invention relates to a continuous synthetic method for propylene carbonate or ethylene carbonate, which mainly comprises the following steps: using urea and propylene glycol or ethylene glycol as a raw materials, and preparing propylene carbonate or ethylene carbonate through reaction and rectification under the existence of catalytic agent. According to the invention, the method has the advantages of high urea conversion rate (that can reach more than 99%), high yield coefficient of propylene carbonate or ethylene carbonate( that can reach more than 92 %), low energy consumption, simple technology and the like, can prepare propylene carbonate or ethylene carbonate continuously and efficiently, and brings a favorable development prospect and huge economic benefits to propylene carbonate or ethylene carbonate and even dimethyl carbonate industries without doubt. The method adopted to produce propylene carbonate or ethylene carbonate has the advantages of simple technological process, mild reaction condition, environmental friendliness, low production cost and the like, and is a new method easy in realizing industrialized production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for continuously preparing propylene carbonate or ethylene carbonate by using urea and propylene glycol or ethylene glycol. Background technique [0002] Propylene carbonate and ethylene carbonate are high-boiling and highly polar organic solvents with excellent performance, and are also important organic chemicals, which have been widely used in organic synthesis, gas separation, battery dielectric, and metal extraction. They can be used as plasticizers, spinning solvents, dispersants for water-soluble dyes and pigments, oily solvents, extractants for olefins and aromatics, used as decarbonization solvents in nitrogen fertilizer production, and used in second-generation lithium-ion batteries Used as electrolyte to protect graphite anode. It is a high-efficiency desulfurization and decarbonization (carbon dioxide) solvent, which is used in industri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D317/36C07D317/38
CPCY02P20/10
Inventor 方云进曹广安杜伟超王元徐瑞峰宋振玖孟庆顺刘琼吴飞宏邵长安
Owner EAST CHINA UNIV OF SCI & TECH