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Process for one-step synthesis of methyl ethyl carbonate and co-production of ethylene glycol by using ethylene oxide

A technology of ethyl methyl carbonate and ethylene oxide, applied in the field of co-production of ethylene glycol, can solve the problems of increased operating costs, high energy consumption in industrial production processes, low conversion rate of reactants and low selectivity of products, etc. To achieve the effect of short synthesis route and clean reaction process

Inactive Publication Date: 2018-06-08
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] At present, in all above-mentioned synthesis methods of ethyl methyl carbonate, the transesterification method is mainly used as the mainstream synthetic route, but the raw material dimethyl carbonate of the transesterification method needs to be synthesized through methanol transesterification of ethylene carbonate or propylene carbonate, while ethylene carbonate Esters need to be prepared by the reaction of ethylene oxide and carbon dioxide, and propylene carbonate needs to be prepared by the reaction of propylene oxide and carbon dioxide. The above-mentioned reaction route needs to be carried out in stages. Complicated distillation and separation operations are required for each product at each stage. The industrial production process consumes a lot of energy and increases operating costs.

Method used

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  • Process for one-step synthesis of methyl ethyl carbonate and co-production of ethylene glycol by using ethylene oxide
  • Process for one-step synthesis of methyl ethyl carbonate and co-production of ethylene glycol by using ethylene oxide
  • Process for one-step synthesis of methyl ethyl carbonate and co-production of ethylene glycol by using ethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Using carbon dioxide, ethylene oxide, methanol and ethanol as raw materials, the reaction generates ethyl methyl carbonate, the substance ratio of methanol and ethanol is 3:2, and the excess carbon dioxide and ethylene oxide are recycled.

[0066] The catalyst is basic composite material 15%BaO-5%CaO-3%La 2 O 3 / Cs-meso-EMT, the dosage is 3% of the total mass of the raw materials, and the ratio of the cross-sectional area of ​​the initial distillation section to the side line section is 1:1.

[0067] The operating conditions are as follows:

[0068] The first reactor T1: the diameter of the tower is 1000mm; the height of the tower is 19000mm; the number of plates in the common rectifying section, the initial distillation section, the side line section and the common stripping section are 10, 20, 30 and 15 respectively; the pressure in the tower is 5MPa; The top temperature is 70°C; the column bottom temperature of the common stripping section is 150°C; the column bott...

Embodiment 2

[0077] Under the operating conditions of Example 1, the total raw material mass flow rate was 2500kg / h, and when the rectification pressure was 3MPa, the reflux ratio of the T2 pressurized rectification tower was changed, and the mass fraction of methyl ethyl carbonate at the bottom of the tower was changed as shown in Table 2 .

[0078] Table 2 Influence of different reflux ratios on the change of the mass fraction of methyl ethyl carbonate at the bottom of the T2 pressurized distillation column

[0079]

[0080] It can be seen from Table 2 that with the increase of the reflux ratio, the mass fraction of EMC at the bottom of the T2 pressurized rectification column first increases and then the increase rate obviously slows down. The reason is that with the increase of the reflux ratio, more methanol, ethanol, DMC and the azeotrope of DMC and methanol at the top of the column are taken out of the liquid phase, and the mass fraction of DMC in the column fraction decreases, an...

Embodiment 3

[0082] Under the operating conditions of Example 1, when the total raw material mass flow rate was 2500kg / h, the pressure of the T2 pressurized rectification tower was changed, and the changes in the mass fractions of the components at the bottom of the tower bottom were shown in Table 3.

[0083] Table 3 Effects of different pressures on the composition of the bottom of the T2 distillation column

[0084]

[0085] It can be seen from Table 3 that with the increase of reaction pressure, the mass fraction of methanol and ethanol in each liquid phase composition decreases, because the boiling point difference of the azeotrope composition increases at higher pressure, and the azeotrope is easier to separate. However, when the pressure is higher than 3MPa, the components basically remain unchanged. Since the high pressure requires high equipment, the input cost will be greatly increased, so 3MPa is the best condition for the rectification process.

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Abstract

The invention discloses a process for one-step synthesis of methyl ethyl carbonate and co-production of ethylene glycol by using ethylene oxide, and relates to the process of synthesizing the methyl ethyl carbonate. According to the process, azeotropic separation is carried out while reaction rectification is carried out, and extraction and separation are carried out on a product without a solvent, so that the technological process of a conventional synthesis process of the methyl ethyl carbonate is greatly simplified, meanwhile multiple components can be separated at one time, and the separation purity is high. The selectivity of the methyl ethyl carbonate in the crude product obtained by the reaction can be up to 70%. The by-products, dimethyl carbonate and diethyl carbonate, can be directly separated out as products, and can be recycled for continued reaction for generating the methyl ethyl carbonate; and the by-product ethylene glycol can be separated out through simple distillation as a bulk raw material. The whole reaction process is clean, efficient and free of pollution, and no waste is generated. The optimal temperature for separating ethylene glycol by using a T4 ethyleneglycol batch rectifying tower is 140-155 DEG C, and the ethylene glycol content can reach 96% or above under the condition.

Description

technical field [0001] The invention relates to a process for synthesizing ethyl methyl carbonate, in particular to a process for synthesizing ethyl methyl carbonate and producing ethylene glycol in one step from ethylene oxide. Background technique [0002] Methyl Ethyl Carbonate (MEC), molecular formula: C 4 H 8 O 3 , colorless and transparent liquid, density 1.01 g / mL, melting point -55 ℃, boiling point 107 ℃, flammable, can be mixed with organic solvents such as alcohol, ketone, ester in any proportion, is an excellent solvent, methyl ethyl carbonate due to Its molecular structure has both methyl and ethyl groups, so it has the characteristics of dimethyl carbonate and diethyl carbonate, and can be used as some special organic synthesis reagents, and it is also a solvent for special fragrances. [0003] Due to its low viscosity, high dielectric constant and strong solubility to lithium salts, methyl ethyl carbonate is an excellent electrolyte solvent for lithium ion b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/04C07C69/96C07C29/128C07C31/20
CPCC07C29/1285C07C68/04C07D317/36C07D317/38C07C69/96C07C31/20Y02P20/141
Inventor 石磊姚杰
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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