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System and process for preparing cyclic carbonate by using composite ionic liquid catalyst

A liquid catalyst, cyclic carbonate technology, applied in the field of circulation process and circulation system, can solve the problems of poor purity, inability to achieve large-scale production, high cost, and achieve the effect of stable process and high recyclability

Pending Publication Date: 2017-04-26
DONGYING HI TECH SPRING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, although there have been studies on the use of ionic liquid catalysts in the preparation of cyclic carbonates, due to the imperfect design of the process route, there are still problems of low conversion rate, poor purity, high cost, and poor stability. Realize real industrialized mass production

Method used

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  • System and process for preparing cyclic carbonate by using composite ionic liquid catalyst
  • System and process for preparing cyclic carbonate by using composite ionic liquid catalyst
  • System and process for preparing cyclic carbonate by using composite ionic liquid catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0112] Propylene Carbonate Synthesis

[0113] according to figure 1 In the process system shown, the specification of the pipeline mixer is DN100×1000mm, and the specification of the straight-tube tubular reactor is Φ450×20000mm. The reactor adopts the operation method of material feeding in and out at the bottom, and the filler is made of 16*16*0.3 metal stainless steel Baoer ring packing.

[0114] First inject the propylene carbonate solution containing 50kg composite ionic liquid catalyst in the circulating catalyst tank, complete the system filling with propylene carbonate and composite ionic liquid catalyst according to the process steps, start to feed the raw materials propylene oxide and carbon dioxide after heating up and boosting the pressure. The feed rate of oxypropane is 500kg / h, the feed rate of carbon dioxide is 416kg / h, the reaction temperature of the reactor is 135-140°C, and the reaction pressure is 4.0MPa. After the reaction, the material enters the flash ta...

Embodiment 2

[0120] Ethylene Carbonate Synthesis

[0121] according to figure 1 In the process method shown, the specification of the pipeline mixer is DN100×1000mm, and the specification of the straight pipe reactor is Φ400×18000mm. The reactor adopts the operation mode of material entering and exiting from the bottom, and the packing adopts 25*25*0.5 metal stainless steel Pall ring packing. Note that when this process is applied to the synthesis of ethylene carbonate, since the melting point of ethylene carbonate is 35-38°C, the entire system needs to be insulated and heat traced to prevent pipeline blockage during start-up and shutdown.

[0122] First inject the ethylene carbonate solution containing 38kg composite ionic liquid catalyst into the circulating catalyst tank, complete the system filling with ethylene carbonate and composite ionic liquid catalyst according to the process steps, start to feed the raw materials ethylene oxide and carbon dioxide after heating up and boosting t...

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Abstract

The invention provides a system for preparing cyclic carbonate by using composite ionic liquid catalyst; the system comprises a pipeline mixer, a straight tube reactor connected with an outlet of the pipe mixer, a flashing device connected with an outlet of the straight tube reactor, and an evaporative separator connected with a liquid outlet of the flashing device; a liquid outlet of the evaporative separator is connected with an inlet of the mixer. Refining and combining are carried out creatively in the invention, and the pipeline mixer and the straight tube reactor are integrated; in terms of mixing, the pipeline mixer is used to carry out mixing, mass transfer effect of propylene oxide and carbon dioxide later in the reaction process of the straight tube reactor is improved, and conversion rate of epoxides is increased; in addition, the purity and conversion rate of cyclic carbonate can be increased, the process is stable, is applicable to industrial large-scale production, and is a reusable efficient green process.

Description

technical field [0001] The invention relates to the technical field of preparation of cyclic carbonates, and relates to a system and process for preparing cyclic carbonates by using a composite ionic liquid catalyst, and in particular to a circulation system and a process for preparing cyclic carbonates by using a composite ionic liquid catalyst. Background technique [0002] With the impact of environmental factors, CO 2 The utilization of CO has been a topic of widespread concern in recent years, due to the activation of CO 2 Molecules require relatively high energy, and only a few pathways have been developed so far. of which CO 2 One of the most successful approaches is to prepare cyclic carbonates through cycloaddition reactions with epoxides. The preparation of cyclic carbonates is an efficient utilization of CO 2 The way is a typical "atom economy" and "green chemistry" reaction. Moreover, cyclic carbonates are widely used in printing and dyeing, textiles, polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38B01J31/02B01J31/26
CPCC07D317/38B01J31/0281B01J31/26B01J2231/34
Inventor 王春梅滕文彬杜桂强宋世晶
Owner DONGYING HI TECH SPRING CHEM IND
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