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Method for using ionic liquid catalyst for catalyzing urea and propylene glycol to synthesize propylene carbonate

A propylene carbonate and ionic liquid technology, applied in the chemical industry, organic chemistry, sustainable manufacturing/processing, etc., can solve the problems of low catalyst catalytic efficiency and difficult catalyst recovery, and achieve high catalytic activity and good separation effect.

Inactive Publication Date: 2016-05-25
屈强好
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Problems solved by technology

[0004] The invention is a method for synthesizing propylene carbonate from urea and propylene glycol with an ionic liquid catalyst, which solves the problems of low catalytic efficiency and difficult catalyst recovery when urea and propylene glycol synthesize propylene carbonate

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  • Method for using ionic liquid catalyst for catalyzing urea and propylene glycol to synthesize propylene carbonate

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[0014] On a set of 5,000 tons of urea-based propylene carbonate production equipment, the ionic liquid and propylene glycol are first transported into the pre-reaction device (1) for preheating, and after reaching the temperature, the urea is transported to the pre-reaction device (1), and the pre-reaction temperature is The temperature is 50°C-200°C, and the pre-reaction time is 0.1h-6h. After the pre-reaction liquid meets the requirements, the pre-reaction feed liquid is transported from the middle into the propylene carbonate reactive distillation tower (2). During the reactive distillation process, propylene glycol , propylene carbonate and ionic liquid catalyst are heavy components moving from the top of the tower to the bottom of the tower, and the nitrogen generated by the reaction is light components, which are separated from the top of the tower. The reaction rectification temperature is 100-200°C, the urea in the tower kettle is less than 2wt%, and the catalyst conten...

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Abstract

The invention relates to a method for using ionic liquid catalyst for catalyzing urea and propylene glycol to synthesize propylene carbonate. Ionic liquid is adopted to catalyze urea and propylene glycol to synthesize propylene carbonate. The process includes pre-reaction, propylene carbonate reactive distillation, catalyst separation and propylene carbonate purification. After being subjected to pre-reaction in a pre-reaction device (1), the ionic liquid, propylene glycol and urea are conveyed to a propylene carbonate reactive distillation column (2) for reactive distillation. Column reactor materials in the propylene carbonate reactive distillation column (2) are conveyed to a catalyst separator (3), light components are conveyed into a propylene carbonate purifying column (4) from the top to be purified, and the ionic liquid is recovered from the bottom. Ammonia gas at the top of the propylene carbonate reactive distillation column (2) is extracted and recovered.

Description

technical field [0001] The invention belongs to the technical field of propylene carbonate preparation, and in particular relates to a method for catalyzing urea and propylene glycol to synthesize propylene carbonate by an ionic liquid catalyst. Background technique [0002] Propylene carbonate (referred to as PC) is a good organic solvent and an important organic chemical product, widely used in organic synthesis, gas separation, electrochemistry and other fields. Especially in recent years, the synthesis of dimethyl carbonate by transesterification has become a new growth point of propylene carbonate. Due to the production of dimethyl carbonate from propylene oxide, a large amount of propylene glycol is produced, which makes it difficult to sell propylene glycol with excess capacity. So some researchers have turned their attention to the synthesis of propylene carbonate from urea and propylene glycol. [0003] In the previous process, the catalysts used in the synthesis ...

Claims

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Application Information

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IPC IPC(8): C07D317/36
CPCC07D317/36Y02P20/10
Inventor 屈强好赵建波杨光
Owner 屈强好
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