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A kind of process of acetic acid hydrogenation coupling preparation ethanol
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A technology of acetic acid and ethanol, which is applied in the preparation of hydroxyl compounds, organic compounds, and carbon monoxide to prepare carboxylic acids, etc. It can solve the problems of high corrosion resistance of catalytic hydrogenation reactors, expensive reaction catalysts, and increased reactor size. , to achieve the effect of increasing the added value of the factory, high operational continuity and stability, and reducing production difficulty
Active Publication Date: 2018-07-10
河南顺达新能源科技有限公司
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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
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Embodiment 1
[0051] A process for preparing ethanol through coupled hydrogenation of acetic acid, using methanol and CO as starting materials to prepare acetic acid, and then using acetic acid as raw materials to prepare ethanol. The specific process is as follows:
[0052] A. Synthesis of acetic acid
[0053] Methanol is sent to the upper part of the reactor I, high-purity CO is sent to the bottom of the reactor I, and the carbonylation reaction is carried out under the catalysis of the catalyst rhodium trichloride and the cocatalyst-methyl iodide in the reactor I to generate acetic acid; carbonylation The reaction pressure is 3.5-4.5MPa, and the reaction temperature is 180-200°C. The obtained crude acetic acid is discharged from the top of the reactor I, and after the iodide is separated, it is sent to step B for hydrogenation reaction; the separated iodide is sent back to the bottom of the reactor I for a circular reaction.
[0054] B. Hydrogenation of acetic acid
[0055] Acetic aci...
Embodiment 2
[0059] This example is a comparative example of Example 1. The raw materials used, the catalyst, the reaction device, and the reaction conditions are all the same as Example 1. The difference is that no circulating compressor is set between Reactor II and Reactor III, and the reactor The secondary tail gas generated by III directly enters the exhaust gas treatment device without circulating reaction.
Embodiment 3
[0061] A process for preparing ethanol through coupled hydrogenation of acetic acid, using methanol and CO as starting materials to prepare ethanol, the process includes three steps of acetic acid synthesis, acetic acid hydrogenation, and secondary hydrogenation. The concrete process of described technology comprises:
[0062] A. Synthesis of acetic acid
[0063] Methanol is sent to the upper part of the reactor I, high-purity CO is sent to the bottom of the reactor I, and the carbonylation reaction is carried out under the catalysis of the main catalyst rhodium trichloride and the cocatalyst - methyl iodide in the reactor I to generate acetic acid; carbonyl The reaction pressure is 3.5-4.5MPa, and the reaction temperature is 180-220°C. The obtained crude acetic acid is discharged from the top of the reactor I, and after the iodide is separated, it is sent to step B for hydrogenation reaction; the separated iodide is sent back to the bottom of the reactor I for a circular rea...
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Abstract
The invention discloses a technology for preparing ethyl alcohol through acetic acid hydrogenation coupling. The technology comprises three steps of acetic acid synthesis, acetic acid hydrogenation and secondary hydrogenation; in the acetic acid synthesis step, methyl alcohol and CO are utilized as raw materials to prepare acetic acid circularly; in the acetic acid hydrogenation step, the acetic acid and hydrogen are utilized as raw materials to perform catalytic hydrogenation to prepare the ethyl alcohol; in the secondary hydrogenation step, hydrogen-enrichment tail gas in the acetic acid hydrogen step and acetic acid / acetate are utilized as raw materials to perform secondary hydrogenation, generated secondary tail gas is pressurized by a circular compressor, then is sent back to the acetic acid hydrogen step, and is mixed with fresh hydrogen to be utilized as a raw material. By adopting the technology disclosed by the invention, the hydrogen is enabled to react deeply, gas circulation amount is reduced, energy consumption is low, a ratio of the hydrogen to the acid can be controlled within 60, the raw materials have a higher conversion rate and yield, the per-pass conversion rate of the acetic acid can be 99% or more, and ethyl alcohol selectivity can be 95% or more; the technology has very high operation continuity and stability, invest is remarkably reduced compared with the same-scale capacity, and energy consumption is reduced by 15% or more compared with energy consumption of ordinary technologies.
Description
technical field [0001] The invention relates to a process for preparing ethanol through coupled hydrogenation of acetic acid, which belongs to the ethanol preparation process. 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 larg...
Claims
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Application Information
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