Method for indirectly synthesizing ethanol by using carbon monoxide and hydrogen

A carbon monoxide and hydrogen technology, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of no industrialization, low ethanol selectivity, and large amount of catalyst, and achieves low price and high content of heavy components. The effect of less and wide source of raw materials

Inactive Publication Date: 2011-01-12
江苏丹化煤制化学品工程技术有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The prior art discloses the process of directly synthesizing ethanol from carbon monoxide and hydrogen, but the catalyst used in this reaction is generally a supported rhodium catalyst. Many scholars and scientific research institutions at home and abroad have carried out long-term research on this, and certain progress has been made, but in the end Have not realized industrialization, reason is that the activity of rhodium catalyst is relatively low in the technique of synthesizing ethanol, and catalyst consumption is many and price is high, and gained product is the C such as ethanol, acetic acid and acetaldehyde. 2 Oxygenated mixtures, low selectivity to ethanol, etc.

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  • Method for indirectly synthesizing ethanol by using carbon monoxide and hydrogen
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Embodiment 1

[0031] The synthesis gas from the coal gasification furnace is subjected to a series of processes of dust removal, wet desulfurization, fine desulfurization, pressure swing adsorption, and catalytic dehydrogenation to obtain carbon monoxide gas with a purity of ≥98.5% and hydrogen with a purity of ≥99%. The purity is calculated by volume percentage, and the obtained Carbon monoxide gas and methanol are catalyzed by rhodium iodide in a high-pressure reactor, and the temperature is 195 ° C and the pressure is 3.0 MPa. The low-pressure carbonylation synthesizes acetic acid; the obtained acetic acid is sent to the reactive distillation column after dehydration and refinement. In the distillation tower, acetic acid and methanol are esterified under the catalysis of sulfuric acid at 60 ℃ and normal pressure to form methyl acetate. After dehydration and purification, the purity of methyl acetate is greater than 99% (calculated by mass percentage), which is used as the subsequent cataly...

Embodiment 2

[0035] The synthesis gas from the coal gasification furnace is subjected to a series of processes of dust removal, wet desulfurization, fine desulfurization, pressure swing adsorption, and catalytic dehydrogenation to obtain carbon monoxide gas with a purity of ≥98.5% and hydrogen with a purity of ≥99%. Gas and methanol are catalyzed by rhodium iodide in a high-pressure reactor, and carbonylated at a temperature of 185°C and a pressure of 2.0 MPa to synthesize acetic acid at a low pressure; In the tower, acetic acid and ethanol are esterified under the catalysis of dodecylbenzenesulfonic acid at 70°C under normal pressure to form ethyl acetate. After dehydration and refining, the purity of ethyl acetate is greater than 99% (calculated by mass percentage). Catalytic hydrogenation feedstock;

[0036] Preparation of copper-based catalyst: 220gCu(NO 3 ) 2 ·3H 2 O, 36.6gZn(NO 3 ) 2 ·6H 2 O, 31.8gMg(NO 3 ) 2 ·6H 2 O and 36.8g Al(NO 3 ) 3 9H 2 O is placed in a beaker, and...

Embodiment 3

[0039] The synthesis gas from the coal gasification furnace is subjected to a series of processes of dust removal, wet desulfurization, fine desulfurization, pressure swing adsorption, and catalytic dehydrogenation to obtain carbon monoxide gas with a purity of ≥98.5% and hydrogen with a purity of ≥99%. The purity is calculated by volume percentage, and the obtained Carbon monoxide gas and methanol are catalyzed by rhodium iodide in a high-pressure reactor, and the temperature is 200 ° C and the pressure is 3.3 MPa. The low-pressure carbonylation synthesizes acetic acid; the obtained acetic acid is dehydrated and refined and then sent to the reactive distillation column. In the distillation tower, acetic acid and n-propanol are esterified under the catalysis of molecular sieves at 85°C under normal pressure conditions to form n-propyl acetate. After dehydration and purification, the purity of n-propyl acetate is greater than 99% (calculated by mass percentage). raw material for...

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Abstract

The invention discloses a method for indirectly synthesizing ethanol by using carbon monoxide and hydrogen, which comprises the following steps of: first synthesizing an acetic acid by using the CO and methanol by a carbonylation method, then esterifying the acetic acid and different low-carbon alcohols to produce corresponding acetic esters, and finally catalytically hydrogenating the acetic esters to indirectly produce the ethanol and alcohols corresponding to the esters of the ethanol. By a process flow of catalytically hydrogenating the acetic esters to indirectly synthesize the ethanol in a way of taking the CO and H2 as basic raw materials, the method has the advantages of developing a new approach for the preparation of the ethanol and finding new raw material sources for the production of the ethanol, and is applied to the condition of abundant coal resources in China. Compared with fermentation methods and chemical synthesis methods in the prior art, the method is popularized and applied to relieve the contradiction of increasingly tense food supply in China, reduce dependence on oil resources and produce important and positive effects on food and energy security in China. The method for synthesizing the ethanol by taking the CO and H2 as the raw materials has significance in the rational utilization of coal resources, the development of clean energy and reduction in environmental pollutions.

Description

technical field [0001] The invention belongs to the technical field of ethanol preparation, in particular to a method for indirectly synthesizing ethanol from carbon monoxide and hydrogen. Background technique [0002] Ethanol is the fermentation industrial product with the longest production history and the largest output in the world. The industrialization of ethanol production began at the end of the 19th century and has a history of more than 100 years. It is widely used in food, chemical, pharmaceutical, dye, national defense and other industries, and it is also a very important clean energy. As a clean energy, ethanol can not only replace tetraethyl lead as an anti-knock agent for gasoline, but also produce ethanol gasoline as a vehicle fuel. Greatly reduce the pollution to the environment when gasoline is burned. [0003] Ethanol production methods are divided into fermentation methods using plant-based substances as raw materials and chemical synthesis methods usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149
Inventor 吴晓金潘学平吴维果梁鹏汤涛
Owner 江苏丹化煤制化学品工程技术有限公司
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