Process for separate production or joint production of ethanol and acetic ether through acetic acid indirect hydrogenation

A technology of ethyl acetate and hydrogenation method, which is applied in the direction of carboxylate preparation, sustainable manufacturing/processing, chemical industry, etc. It can solve the problems of difficult amplification, affecting product quality, and difficult separation and purification, so as to achieve good product quality, The effect of reducing equipment requirements and simple separation process

Active Publication Date: 2012-07-11
ZHONGRONG TECH CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many types of impurities in the product, not only difficult to separate and purify, but also affect the quality of the product
Third, although the noble metal catalyst has high activity and can increase the liquid hourly space velocity, the thermal effect of the direct hydrogenation of acetic acid is strong (250 degrees 22bar, the heat of reaction is 47.6kJ / mol, while the general monocarbonyl hydrogenation reaction heat is 20kJ / mol ), it is difficult to scale up when operating with high liquid hourly space velocity
The above two patents both emphasize that they are aimed at various acetates, including at least methyl acetate and ethyl acetate. The content of the patents is the formulation and preparation method of copper-based catalysts, and does not involve the production process starting from acetic acid and hydrogen.

Method used

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  • Process for separate production or joint production of ethanol and acetic ether through acetic acid indirect hydrogenation
  • Process for separate production or joint production of ethanol and acetic ether through acetic acid indirect hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The process for single-unit or co-production of ethanol and ethyl acetate by indirect hydrogenation of acetic acid, the flow chart is as follows:

[0037] Acetic acid and the mixture of ethanol and ethyl acetate from the top of the ethanol rectification tower enter the tower still of the esterification reaction tower 1, and carry out the esterification reaction under the action of the acid catalyst. The content of the acid catalyst in the tower kettle is between 1wt.% and 5wt.%, which is regularly discharged and replenished. The molar ratio of acetic acid to ethanol in the feed is between 0.5 and 2.0, preferably 0.8 to 1.2. Generated ethyl acetate and water are distilled out from the top of the esterification reaction tower 1, condensed by the condenser 2, and then enter the water separator 3 to obtain crude ethyl acetate and water containing a small amount of ethyl acetate. The water containing a small amount of ethyl ester in the lower floor enters the recovery tower...

Embodiment 2

[0044] Annual production of 100,000 tons of ethanol

[0045] If the production target is 100,000 tons of ethanol, the three sets of devices, namely: esterification, hydrogenolysis and hydrogen production plants, need to operate at full capacity. Every year, 130,300 tons of acetic acid raw materials are consumed, 8,680 tons of hydrogen are consumed, and 39,100 tons of water are removed. The liquid product of the hydrogenolysis unit is separated and purified through the ethanol tower; the unreacted ethyl acetate and part of the ethanol are separated from the top of the tower, and the deesterification tower is used as the raw material for the esterification reaction.

Embodiment 3

[0047] Annual output of 100,000 tons of ethyl acetate

[0048] If 100,000 tons of ethyl acetate is the production target, the esterification unit will run at full capacity, and the hydrogenolysis and hydrogen production plants will both operate at about half the load, that is, the processing capacity of the hydrogenolysis unit will be about 100,000 tons, and the hydrogen production capacity will be 4540. Ton can be. When ethyl acetate is used as the target product, the liquid product from the hydrogenolysis unit can directly go to the esterification tower without separation.

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Abstract

The invention relates to a process for separate production or joint production of ethanol and acetic ether through acetic acid indirect hydrogenation. Acetic acid and ethanol are placed in an esterification tower, the acetic acid and the ethanol are subjected to reactive distillation in the presence of acid catalysts, the acetic ether and water are obtained, the mixture is distilled off from the top of the tower and enters a water segregator, a rectification light removal tower and a rectification heavy removal tower after being condensed, so that impurities are removed and conforming products of the acetic ether are obtained. Part of the products are sold, and others are regarded as raw materials for producing the ethanol in a hydrogenolysis reaction, led to a hydrogenolysis tower and subjected to catalytic hydrogenolysis so as to selectively obtain the ethanol. Part of or all the ethanol obtained by hydrogenolysis of the acetic ether is regarded as a raw material for an esterification reaction and reacts with the acetic acid in the esterification tower. Compared with the existing technologies, the process is simple in flow and low in production cost; and either the ethanol or the acetic ether can be produced selectively, or both the ethanol and the acetic ether can be produced in a certain proportion through adjustment of the production capacity of a hydrogenolysis and hydrogen production device.

Description

technical field [0001] The present invention relates to the process of unit production or co-production of anhydrous ethanol and ethyl acetate, especially relates to acetic acid and hydrogen as raw materials, through the two-step reaction of acetic esterification and ethyl acetate hydrogenolysis, high selective unit production or co-production of anhydrous Process technology for two products, ethanol and ethyl acetate. Background technique [0002] Compared with already high oil and grain prices, coal prices are relatively cheap. In recent years, the rapid expansion of domestic coal chemical industry has led to a continuous decline in the price of coal chemical product acetic acid; while the price of ethanol produced based on petroleum or grain as raw materials has continued to rise. In this context, the production of ethanol and its downstream products from acetic acid has become profitable, forming a new profit growth point. Celanese (Celanese International Corporation) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/08C07C31/08C07C29/149
CPCY02P20/10
Inventor 代淑梅陈瑞芳
Owner ZHONGRONG TECH CORP LTD
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