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Ethanol refining method

A technology of ethanol and process, which is applied in the field of ethanol purification, can solve the problems of unrecoverable ethyl acetate, increased processing costs, and high content of sodium acetate, so as to reduce energy consumption, reduce equipment investment and energy consumption, and improve the utilization rate of heat Effect

Inactive Publication Date: 2017-07-28
WUHAN JINZHONG PETROCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art of adding alkali to neutralize ethyl acetate in the ethanol raw material liquid, causing ethyl acetate to be hydrolyzed, causing excessive sodium acetate content in the waste water, increasing processing costs, and ethyl acetate cannot be recovered defects, thus providing an ethanol refining process

Method used

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Examples

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Embodiment 1

[0030] The present embodiment provides a kind of ethanol refining process, comprises the following steps:

[0031] Step 1, the ethanol raw material and water are respectively passed into the light removal tower according to the mass ratio of 0.1:1 for light removal, and the overhead distillate and the bottom residue are obtained by separation;

[0032] Wherein the overhead distillate includes hydrogen, methane, acetaldehyde, ether, acetone and ethyl acetate, and the bottom residue includes ethanol, water, acetic acid, isopropanol and n-butanol;

[0033] The top gauge pressure of the light removal tower is 10kpa, the ethanol raw material enters from the middle part of the light removal tower, and the water enters the light removal tower from the upper part where ethanol enters the light removal tower;

[0034] Step 2, the sodium hydroxide solution and the bottom residue of the light removal tower are sent to the neutralization unit reactor for neutralization, the pH value of th...

Embodiment 2

[0038] like figure 1 As shown, the present embodiment provides a kind of ethanol refining process, comprises the steps:

[0039] Step 1, the ethanol raw material and water are respectively passed into the delightening tower according to the mass ratio of 1:1 to carry out lightening, and the overhead distillate and the bottom residue are separated to obtain;

[0040] Wherein the overhead distillate includes hydrogen, methane, acetaldehyde, ether, acetone and ethyl acetate, and the bottom residue includes ethanol, water, acetic acid, isopropanol and n-butanol;

[0041] The top gauge pressure of the light removal tower is 20kpa, the ethanol raw material enters from the middle part of the light removal tower, and water enters the light removal tower from the upper part where the ethanol enters the light removal tower;

[0042] Step 2, the sodium hydroxide solution and the bottom residue of the light removal tower are sent to the reactor (neutralization unit) for neutralization, a...

Embodiment 3

[0046] The present embodiment provides a kind of ethanol refining process, comprises the following steps:

[0047] Step 1, the ethanol raw material and water are respectively passed into the delightening tower according to the mass ratio of 0.5:1 for lightening, and the overhead distillate and the bottom residue are obtained by separation;

[0048] Wherein the overhead distillate includes hydrogen, methane, acetaldehyde, ether, acetone and ethyl acetate, and the bottom residue includes ethanol, water, acetic acid, isopropanol and n-butanol;

[0049] The top gauge pressure of the light removal tower is 30kpa, the ethanol raw material enters from the middle part of the light removal tower, and the water enters the light removal tower from the upper part where ethanol enters the light removal tower;

[0050] Step 2, the sodium carbonate solution and the bottom residue of the light removal tower are sent to the reactor for neutralization, the pH value of the bottom residue of the ...

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Abstract

The invention provides an ethanol refining method. The ethanol refining method comprises following steps: ethanol raw material and water are delivered into a light component removal column for light component removing so as to obtain an overhead product and a bottom residue via separation, wherein water is taken as an extracting agent; the bottom residue is subjected to alkali solution neutralization, and then is delivered into a product tower for purification and dehydration so as to obtain an ethanol-containing overhead product and a water-containing bottom residue via separation; the ethanol-containing overhead product is delivered into a dehydration unit for dehydration so as to obtain refined ethanol. According to the ethanol refining method, decomposition of acetic ether in neutralization of acetic acid in the ethanol raw material is avoided, and the content of sodium acetate in the water-containing bottom residue of the product tower is reduced.

Description

technical field [0001] The invention belongs to the technical field of ethanol purification, and relates to a process for refining ethanol. Background technique [0002] Ethanol is an important raw material for chemical industry, medicine, energy and food, and can be used to manufacture flavors, dyes, fuels, beverages, etc. At present, the industrial production methods of ethanol mainly include fermentation method, ethylene hydration method and acetic acid hydrogenation method. Since the process of preparing ethanol by acetic acid hydrogenation method is simple, and the raw material acetic acid has a wide range of sources, the ethanol preparation process is widely used. At present, there are two ways to produce ethanol products from acetic acid as a raw material. One is to generate acetate through esterification of acetic acid, and then hydrogenate acetate to generate ethanol; the other is to directly hydrogenate acetic acid to generate ethanol. The ethanol obtained by the ...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/80C07C29/88C07C31/08
CPCC07C29/74C07C29/88C07C31/08C07C29/80
Inventor 周春平黄龙易金华张旭李松
Owner WUHAN JINZHONG PETROCHEM ENG
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