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Technology for preparing ethanol from acetic ether through hydrogenation

A technology for preparing ethyl acetate and hydrogen, which is applied in the preparation of hydroxyl compounds, sustainable manufacturing/processing, preparation of organic compounds, etc., can solve the problem of high corrosion resistance of catalytic hydrogenation reactors, expensive reaction catalysts, and catalytic hydrogenation. To solve the problem of high energy consumption, to achieve the effect of improving comprehensive utilization capacity, providing stability and improving utilization rate

Active Publication Date: 2016-06-15
河南顺达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first method, the corrosiveness of acetic acid makes the catalytic hydrogenation reactor have higher corrosion resistance, and the reaction catalyst is expensive, which makes the production cost high
Compared with the first method, the second method has one more step of esterification process. Although the corrosiveness of acetic acid to the reactor is reduced, the product ethanol is required to be recycled as the raw material for esterification, which increases the size of the reactor accordingly. Moreover, the energy consumption of catalytic hydrogenation is high

Method used

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  • Technology for preparing ethanol from acetic ether through hydrogenation
  • Technology for preparing ethanol from acetic ether through hydrogenation
  • Technology for preparing ethanol from acetic ether through hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A process for preparing ethanol by hydrogenation of ethyl acetate, comprising the following steps:

[0036] A. The raw material high-pressure hydrogen (pressure 2-3.5MPa, temperature 20-35°C) is preheated to 140-170°C by a hydrogen preheater, and sent to the top of the vaporization tower; the raw material ethyl acetate (pressure 2-35°C) 3.5MPa, the temperature is 40-50°C) into the acetate heater to heat to 140-170°C, and spray into the vaporization tower from top to bottom through the atomization nozzle on the upper part of the vaporization tower; ethyl acetate and hydrogen After being fully contacted and vaporized by the packing in the vaporization tower, it is discharged from the outlet at the bottom of the vaporization tower;

[0037]B. The raw material mixture gas from the vaporization tower is preheated at the shell side of the raw material gas preheater. After reaching 180-220°C, it is sent to the top of the hydrogenation reactor filled with alkali metal catalysts...

Embodiment 2

[0045] A process for preparing ethanol by hydrogenation of ethyl acetate, comprising the following steps:

[0046] A. The raw material high-pressure hydrogen (pressure 2.5-4.5MPa, temperature 25-30°C) is preheated to 140-170°C by a hydrogen preheater, and sent to the top of the vaporization tower; the raw material ethyl acetate (pressure 2.5-30°C) 4.5MPa, temperature 45~55℃) into the acetate heater to heat to 150~160℃, and spray into the vaporization tower from top to bottom through the atomization nozzle on the upper part of the vaporization tower; ethyl acetate and hydrogen After being fully contacted and vaporized by the packing in the vaporization tower, it is discharged from the outlet at the bottom of the vaporization tower;

[0047] B. The raw material mixture gas from the vaporization tower is preheated at the shell side of the raw material gas preheater, and after reaching 180-210°C, it is sent to the top of the hydrogenation reactor filled with an alkali metal cataly...

Embodiment 3

[0055] This example is a comparative example, referring to the preparation method disclosed in Example 1 of Chinese Patent CN103265402B.

[0056] The ethanol selectivity, ethanol single-pass conversion rate and energy consumption for producing one ton of ethanol were calculated for the above three examples, and the results are shown in the table below.

[0057]

[0058] As can be seen from the data in the table, the selectivity of the ethanol product obtained in embodiment 1 and embodiment 2 is comparable to that of the ethanol product obtained in embodiment 3, but the single-pass conversion rate of ethyl acetate is higher, and the power consumption and steam consumption Both are significantly reduced, and the production cost of ethanol is reduced, which is very suitable for industrialization promotion.

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Abstract

The invention discloses a technology for preparing ethanol from acetic ether through hydrogenation.The technology comprises the following steps that 1, high-pressure hydrogen and acetic ether are preheated and then sent into a vaporizing tower for vaporization; 2, mixed gas is preheated to 170-250 DEG C in a feed gas preheater shell pass and then sent to a hydrogenation reactor to be subjected to hydrogenation reaction from top to bottom through a catalyst layer; 3, a high-temperature gas product exhausted after the hydrogenation reaction is conducted is cooled and then subjected to separation and purification, and high-purity fuel ethanol is obtained.The ethanol product prepared through the technology is high in yield and purity; reaction heat generated in the catalytic hydrogenation reaction process is reasonably recycled, heating does not need to be additionally conducted, and therefore the reaction energy consumption is greatly reduced.Compared with the energy consumption of an existing acetic ether catalytic hydrogenation reaction, the energy consumption is reduced by 10% or above.

Description

technical field [0001] The invention relates to a process for preparing ethanol, in particular to a process for preparing ethanol by hydrogenating ethyl acetate. Background technique [0002] Ethanol is the earliest and most widely used fatty alcohol, and it is also the main component of wine. Ethanol is a colorless, volatile, flammable liquid at room temperature. Ethanol has a wide range of uses. For example, it can be used to produce various chemical raw materials such as acetaldehyde, ether, ethyl acetate, ethylamine, and ethylene oxide. , plastics, man-made fibers, detergents and other fields are widely used. [0003] At present, the industrial production methods of ethanol mainly include fermentation method and ethylene hydration method. The main raw materials of the fermentation method are crops such as corn, sugarcane, sorghum, cassava, rice, etc., and the starch in the crops is used to ferment ethanol; however, the fermentation method consumes a large amount of fo...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/149C07C29/76
CPCC07C29/149C07C29/76C07C31/08Y02P20/50
Inventor 汤广斌潘科甘道才
Owner 河南顺达新能源科技有限公司