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Product separation system and separation method for preparing ethanol by hydrogenating methyl acetate

A technology for methyl acetate and separation methods, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as many carboxylate compounds, low yield of ethanol products, and reduced process material consumption. Achieve the effects of reducing production costs, reducing steam consumption, and reducing overall energy consumption

Active Publication Date: 2020-07-17
WISON ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has some disadvantages: the amount of methanol entering the methanol tower is large, and the amount of ethanol taken away will also be large, which will lead to high energy consumption and low ethanol yield; There are more ester compounds, which will reduce the material consumption of the process
In general, the existing separation process of acetate hydrogenation products has the problems of high energy and material consumption and low yield of ethanol products.

Method used

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  • Product separation system and separation method for preparing ethanol by hydrogenating methyl acetate
  • Product separation system and separation method for preparing ethanol by hydrogenating methyl acetate
  • Product separation system and separation method for preparing ethanol by hydrogenating methyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Combine below figure 1 Example 1 will be described.

[0062] Use as figure 1 Shown is a product separation system for hydrogenation of methyl acetate to ethanol. The separation system includes a first distillation tower T1, a second distillation tower T2, a third distillation tower T3, and a fourth distillation tower T4. The first distillation tower T1 is provided with a first top gas phase outlet, The first top liquid phase outlet and the first bottom liquid phase outlet, the second rectification tower T2 is provided with a second top gas phase outlet, a second top liquid phase outlet, and a second bottom liquid phase outlet, so The third distillation tower T3 is provided with a third top liquid phase outlet and a third tower bottom liquid phase outlet, and the fourth rectification tower T4 is provided with a fourth top top liquid phase outlet and a fourth tower bottom liquid phase outlet. , The product of methyl acetate hydrogenation to produce ethanol is passed into ...

Embodiment 2

[0074] This embodiment is the same as embodiment 1, and the differences from embodiment 1 are as follows:

[0075] The number of theoretical plates in the first distillation tower is 60, the pressure at the top of the tower is 150kPa, and the temperature at the bottom of the tower is 87°C.

[0076] The number of theoretical plates in the second distillation tower is 50, the pressure at the top of the tower is 80kPa, and the temperature at the bottom of the tower is 65°C. A total of 39 kg / h of carboxylate lost in the gas phase along the top of the first distillation tower and the second distillation tower.

[0077] The number of theoretical plates of the third distillation column is 70, the pressure at the top of the tower is 400kPa, the temperature at the top of the tower is 104°C, and the temperature after total condensation is 102.4°C.

[0078] The number of theoretical plates in the fourth distillation column is 40, the pressure at the top of the column is 80kPa, and the temperatur...

Embodiment 3

[0084] This example is the same as Example 1, and the differences from Example 1 are as follows: The composition of the crude ethanol-containing product S1 obtained by hydrogenating methyl acetate is: 1% ether light component, 8% acetate, and 45% methanol. Ethanol 45%, heavy alcohol 1%. The number of theoretical plates in the first distillation column is 80, the pressure at the top of the column is 400kPa, and the temperature at the bottom of the column is 85°C.

[0085] The number of theoretical plates in the second distillation tower is 20, the pressure at the top of the tower is 400kPa, and the temperature at the bottom of the tower is 105°C. A total of 37kg / h of carboxylic acid ester lost in the gas phase from the top of the first distillation tower and the second distillation tower.

[0086] The number of theoretical plates of the third distillation tower is 100, the pressure at the top of the tower is 600kPa, the temperature at the top of the tower is 117.8°C, and the temper...

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Abstract

The invention relates to a product separation system and separation method for preparing ethanol by hydrogenating methyl acetate. The invention comprises employing a separation process including a first rectifying tower, a second rectifying tower, a third rectifying tower and a fourth rectifying tower; enabling raw materials containing ester, methyl alcohol and ethyl alcohol to enter a first rectifying tower to be unclearly cut, separating part of methyl alcohol out, and removing light impurities; enabling a tower top liquid phase to enter a second rectifying tower to separate out high-puritymethyl alcohol, enabling a tower bottom liquid phase of the first rectifying tower to sequentially enter a third rectifying tower and a fourth rectifying tower, and obtaining methyl alcohol, ethyl alcohol products and heavy component impurities respectively. According to the method, the first rectifying tower is used for carrying out non-clear segmentation, substance impurities such as light component esters and the like are separated from the heavy key component ethanol, the yield of ethanol is increased while the purity of an ethanol product is ensured, the loss of carboxylic ester is reduced, and the material consumption is reduced.

Description

Technical field [0001] The invention relates to a product separation system and a separation method for indirect production of ethanol from syngas, in particular to a product separation system and separation method for the hydrogenation of methyl acetate to produce ethanol. Background technique [0002] Ethanol (CH 3 CH 2 OH) is an important basic chemical raw material, which is widely used in many fields such as food, chemical industry, military industry, and medicine. Ethanol is also a world-recognized environmentally friendly clean fuel and oil quality improver. It can be used as vehicle fuel to be transferred into gasoline and is a new type of clean fuel. Fuel ethanol is an important direction for the development and utilization of renewable energy. The proportion of its use is gradually increasing. The United States and Brazil have used ethanol gasoline for more than 30 years. Europe and Southeast Asia are also actively promoting the use of ethanol gasoline. [0003] There is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C31/04C07C29/80
CPCC07C29/80C07C31/08C07C31/04Y02P20/10
Inventor 张佳楠赵娜丁干红吕建宁王宏涛尹佳子田靖张磊黄守莹马新宾
Owner WISON ENG