Composite absorbent and method of utilizing the same for coupled ethylene oxide absorption and conversion for ethylene carbonate co-production

A technology of ethylene carbonate and ethylene oxide, used in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve the complex process, large one-time investment and large consumption. energy and other issues to achieve the effect of ensuring safety, reducing energy consumption and costs, and reducing exhaust gas content

Active Publication Date: 2019-11-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These absorbents have improved the absorption capacity and selectivity to ethylene oxide, but in the whole process flow, the process of stripping ethylene oxide still consumes a lot of energy, and the process flow is complicated, the equipment cost is high, and the one-time investment is large.
[0004] Therefore, in order to better realize the absorption of ethylene oxide in the mixed gas after ethylene oxidation and the production of ethylene carbonate, new absorbents and processes are still needed, which can not only absorb ethylene oxide efficiently, but also solve the problem of gas The problem of high energy consumption during the lifting process

Method used

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  • Composite absorbent and method of utilizing the same for coupled ethylene oxide absorption and conversion for ethylene carbonate co-production
  • Composite absorbent and method of utilizing the same for coupled ethylene oxide absorption and conversion for ethylene carbonate co-production

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Effect test

Embodiment 1

[0042] This embodiment provides a composite absorbent and its method for the coupled co-production of ethylene carbonate in the absorption and transformation of ethylene oxide. The specific operation steps are as follows:

[0043] The feed gas containing 2.26mol% ethylene oxide at 80°C enters the absorption tower from the bottom of the tower, and the composite absorbent ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium bromide ([Hemim]Br) and carbonic acid Vinyl esters are mixed uniformly at a mass ratio of 1:10 and then enter from the top of the absorption tower (T1). The raw material gas is in countercurrent contact with the absorbent. The absorption temperature is 80°C, the operating pressure is 2MPa, the liquid-to-gas mass ratio is 3, The conversion rate of ethylene oxide in the conversion section is 28.8%, the concentration of ethylene oxide at the top of the absorption tower is 69ppm, and the absorption rate at this time is 99.9%.

[0044] Add the above absorbing liqui...

Embodiment 2

[0046] This embodiment provides a composite absorbent and its method for the coupled co-production of ethylene carbonate in the absorption and transformation of ethylene oxide. The specific operation steps are as follows:

[0047] The feed gas containing 2.26mol% ethylene oxide at 80°C enters the absorption tower from the bottom of the tower, and the composite absorbent ionic liquid 1-hexyl-3-methylimidazolium bromide ([Hmim]Br) and ethylene carbonate are mixed in a ratio of 1:10 After the mass ratio is mixed evenly, it enters from the top of the absorption tower (T1), and the raw material gas is in countercurrent contact with the absorbent. The absorption temperature is 80°C, the operating pressure is 2MPa, the liquid-gas mass ratio is 3, and the ethylene oxide in the pre-reforming section is absorbed. The conversion rate of the product is 15.8%, the concentration of ethylene oxide at the top of the absorption tower is 227ppm, and the absorption rate is 99.5% at this moment. ...

Embodiment 3

[0050] This embodiment provides a composite absorbent and its method for the coupled co-production of ethylene carbonate in the absorption and transformation of ethylene oxide. The specific operation steps are as follows:

[0051] The feed gas containing 2.26mol% ethylene oxide at 80°C enters the absorption tower from the bottom of the tower, and the composite absorbent ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium bromide ([Hemim]Br) and carbonic acid Vinyl esters are mixed evenly at a mass ratio of 1:9 and enter from the top of the absorption tower (T1). The raw material gas is in countercurrent contact with the absorbent. The conversion rate of ethylene oxide in the conversion section is 32.2%, the concentration of ethylene oxide at the top of the absorption tower is 44ppm, and the absorption rate at this time is 99.9%.

[0052] Add the above absorbing solution into the reactor, raise the reaction temperature to 120°C, and react for 1 hour under the pressure of 2MPa. ...

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Abstract

The present invention provides a composite absorbent and a method of utilizing the same for coupled ethylene oxide absorption and conversion for ethylene carbonate co-production. The composite absorbent includes an ionic liquid having a structure shown as a formula I, a formula II or a formula III and ethylene carbonate. The composite absorbent is used for absorbing ethylene oxide and carbon dioxide. In the process of absorption, the ionic liquid also acts as a catalyst to catalyze reaction between the ethylene oxide and the carbon dioxide to produce the ethylene carbonate, and pre-conversionis achieved while absorption, so that the energy consumption is reduced and industrial application value is high. The composite absorbent is also used for coupled ethylene oxide absorption and conversion for ethylene carbonate co-production, absorption and conversion are directly coupled, one-step production of the ethylene carbonate is achieved, and the method is simple to operate and low in equipment cost, omits a stripping step, reduces energy consumption, and meets requirements on cost-effectiveness, energy saving and environment protection.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a composite absorbent and a method for coupling and co-producing ethylene carbonate by absorption and conversion of ethylene oxide. Background technique [0002] Ethylene carbonate, known as the green chemical raw material in the 21st century, is a widely used chemical intermediate and excellent solvent. Ethylene oxide, one of the raw materials for synthesizing ethylene carbonate, mainly uses ethylene to oxidize under the action of a silver-containing catalyst to generate ethylene oxide, and impurity gases such as methane and ethane will exist in the process of preparing ethylene oxide. In order to obtain refined ethylene oxide, the industry often uses the absorption method to absorb ethylene oxide from the mixed gas, and then refines it through stripping, concentration and other processes to obtain high-purity ethylene oxide; refined ethylene oxide Alkanes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38C07D303/04C07D301/32B01J31/02
CPCB01J31/0284C07D301/32C07D303/04C07D317/38
Inventor 成卫国董丽褚俊杰张增亮苏倩陈嵩嵩刘一凡张香平张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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