Technology for producing ethanol through methyl acetate via methanol

A technology for producing methyl acetate and ethanol, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of increased reactor volume, large equipment consumption, serious equipment loss, etc. Not high, flexible operation, reduce the effect of heavy use

Active Publication Date: 2018-10-26
TAIYUAN UNIV OF TECH
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Problems solved by technology

In many patents disclosing the hydrogenation of acetate to ethanol, the required hydrogen ester ratio is relatively high, such as Xie Xuan. Research on the hydrogenation of methyl acetate to ethanol [D]. The required hydrogen ester ratio is 100:1, As a result, the volume of the reactor increases and the equipment loss is serious. No matter which process requires hydrogen, the cost of hydrogen production is relatively high. For example, the equipment and plant investment required for hydrogen production from natural gas and coal production account for 1 / 3 of the total fixed assets To 1 / 2, equipment consumption is large

Method used

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  • Technology for producing ethanol through methyl acetate via methanol
  • Technology for producing ethanol through methyl acetate via methanol

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Embodiment 1

[0031] Methanol is used to provide a hydrogen source to the process flow of hydrogenation of methyl acetate to ethanol, and the specific embodiment includes: making the mixture of methyl acetate and methanol in a molar ratio of 3:1 in H 2 Under the atmosphere of the reaction device, the reaction temperature is 50°C and the reaction pressure is 0.5MPa. The gas-liquid separation device is used to separate the gas and liquid materials from the output materials of the reaction device. The liquid mixture is mainly the by-product after separating ethanol or the liquid phase The by-product after ethanol is separated from the mixture passes through the separated methanol, and then passes into the reactor together with methanol and methyl acetate as raw materials. From the liquid material output from the reaction device, the main product ethanol is separated by extraction and rectification. The selectivity is 90%. The by-products mainly include methyl acetate, ethyl acetate and unreacte...

Embodiment 2

[0033] A mixture of methyl acetate and methanol in a molar ratio of 4:1 in N 2 Add the reaction device under the atmosphere, the temperature should be 70 ℃ and the reaction pressure 1 MPa, the liquid space velocity 1h -1 , a gas-liquid separation device that separates gas and liquid materials from the output material of the reaction device, and separates gas N 2 Circulating to the reactor, the liquid material output by the device is separated by adding salt, extracting, rectifying and separating the main product ethanol with a selectivity of 92%, and the by-product methyl acetate, ethyl acetate is recovered and rectified to obtain other chemical raw products and unreacted acetic acid Methyl ester and methanol are recycled to the reactor for further reaction, wherein the conversion rates of methanol and methyl acetate are 87.34 and 90.12% respectively, and the selectivity of ethanol is 80.89%.

Embodiment 3

[0035] A mixture of methyl acetate and methanol in a molar ratio of 5:1 was 2 Add the reaction device under the atmosphere, the temperature should be 100 ℃ and the reaction pressure 1.2MPa, the liquid space velocity 2h -1 , a gas-liquid separation device that separates the gas and liquid mixture from the output material of the reaction device, and separates the gas CO 2 Circulate to the reactor, the liquid material output from the device is separated by adding salt, extracting, rectifying and separating the main product ethanol with a selectivity of 94%, and the by-products methyl acetate, ethyl acetate and unreacted methyl acetate and methanol are recycled to the reactor After further reaction, the selectivity of ethanol was 85.47%, the conversion rate of methanol reached 87.93%, and the conversion rate of acetic acid reached 79.78%.

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Abstract

The invention provides a technology for producing ethanol through methyl acetate via methanol. The technology comprises the following steps: adding the methanol and the methyl acetate into a reactor;under the action of a catalyst, carrying out hydrogenation reaction on methanol cracked in-situ hydrogen and the methyl acetate to generate the ethanol under certain reaction temperature, reaction pressure, liquid airspeed and gas airspeed; carrying out gas-liquid separation on a reaction product and circulating an obtained gas mixture to the reactor, so as to obtain a liquid mixture; furthermore,refining and separating to obtain the ethanol. According to the technology provided by the invention, the methanol is used as a hydrogen source and a hydrogenation process is saved; the utilization rate of hydrogen is improved and the hydrogenation cost is greatly improved; the efficiency of hydrogenating the methyl acetate to prepare the ethanol is improved.

Description

technical field [0001] The invention relates to a process for producing ethanol by hydrogenating methyl acetate, in particular to a process for producing ethanol from methyl acetate with methanol. Background technique [0002] Due to the importance of ethanol in industry and life, people have long been working hard to develop economically feasible ethanol preparation processes. [0003] Ethanol (C 2 h 5 OH), commonly known as alcohol, is a flammable, volatile, colorless and transparent liquid at normal temperature and pressure. Its aqueous solution has a special pleasant fragrance and is slightly irritating. It is widely used in chemical, Food, national defense, medicine, printing and dyeing and other industrial fields; in the food industry, ethanol is used to prepare various beverage wines; in the national defense industry, ethanol is involved in the manufacture of explosives; in the pharmaceutical industry, ethanol can be used for pharmaceuticals, disinfection, etc.; in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C31/08
CPCC07C29/149C07C31/08
Inventor 申曙光徐晨阳常苏杰单伟伟李浩列郭晨源
Owner TAIYUAN UNIV OF TECH
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