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Technique of synthesizing ethanol with acetic acid

A technology of ethyl acetate and acetic acid, which is applied in the field of ethanol production from acetic acid, can solve the problems of low conversion rate of acetic acid and incomplete conversion of acetic acid, and achieve the effect of overcoming low conversion rate

Active Publication Date: 2015-03-25
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the low conversion rate of acetic acid in the prior art, and the need for corrosion-resistant material equipment due to the incomplete conversion of acetic acid in the hydrogenation reaction process

Method used

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  • Technique of synthesizing ethanol with acetic acid
  • Technique of synthesizing ethanol with acetic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Process flow of the present invention such as figure 1 Shown, acetic acid enters esterification reactor 1 through pipeline 1, reacts with crude ethanol from pipeline 9 under the effect of acidic catalyst to generate ethyl acetate product, and the product containing ethyl acetate of generation enters crude separation tower through pipeline 2 II. In the crude separation tower, the unreacted acetic acid is separated, and then returned to the esterification reactor I through the pipeline 4. The crude ester containing ethyl acetate separated from the crude fractionation column enters the vaporization tower III through the pipeline 3. In the vaporization tower III, the crude ester from the pipeline 3 is mixed with hydrogen and heated to the bubble point of the crude ester, and then passed through the pipeline 5 It enters the hydrogenation reactor IV and reacts under the action of a copper-based catalyst. The reacted stream mainly contains ethanol, water, unreacted hydrogen, a...

Embodiment 2

[0025] The temperature of reaction in embodiment 1 is changed into 180 o C, the reaction pressure becomes 0.5 MPa, the molar ratio of hydrogen and ethyl acetate is 100, the selectivity of reaction result ethanol is 98.2%, the space-time yield of ethanol is 412.7 g kg -1 h -1 .

Embodiment 3

[0027] The temperature of reaction in embodiment 1 is changed into 300 o C, the reaction pressure becomes 5.0 MPa, the molar ratio of hydrogen to ethyl acetate is 10, the selectivity of the reaction result ethanol is 95.3%, the space-time yield of ethanol is 1633.6 g kg -1 h -1 .

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Abstract

The invention aims to solve the problem that conversion rate of acetic acid is low in the prior techniques and corrosion resistant material equipment is needed because the acetic acid cannot convert completely in hydrogenation reaction. The technical scheme includes: acetic acid and hydrogen are used as raw materials to synthesize ethanol, acetic ester is produced from esterification reaction of acetic acid and monohydric alcohol, ethanol and corresponding monohydric alcohol are produced from acetic ester and hydrogen, the monohydric alcohol reacts with acetic acid in the esterification reaction step, and the ethanol is sent to a rectifying tower to refine. The technique of synthesizing ethanol with acetic acid has the advantages that cheap copper catalyst is used in the reaction, material of hydrogenation equipment do not have to be corrosion resistant, acetic ester including monohydric alcohol and water is used as raw material, hydrogen is added to the acetic ester to synthesize ethanol, and the problem that conversion rate of acetic acid in the prior technique is solved.

Description

technical field [0001] The invention relates to a process for preparing ethanol from acetic acid, in particular to a process for synthesizing ethanol by taking acetic acid as raw material through esterification and hydrogenation. Background technique [0002] Ethanol is an important organic chemical product, which is widely used in food, chemical, pharmaceutical, dyestuff, national defense and other industries. Ethanol can also replace tetraethyl lead as an anti-knock agent for gasoline, and can also be used as fuel doped in gasoline As ethanol gasoline for vehicles. Currently, 60% of ethanol production is used as vehicle fuel in the world. [0003] The production methods of ethanol are divided into fermentation method and chemical synthesis method. The fermentation method mainly uses corn, cassava, wheat, sorghum and other food crops as raw materials, and is obtained through fermentation and distillation under the action of microorganisms. The production of ethanol by c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/149
Inventor 李扬古共伟王科胡玉容范鑫陈鹏曾健
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND