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Process for preparing ethanol from synthesis gas via methyl alcohol

A technology for syngas and ethanol production, which is applied in the preparation of hydroxyl compounds, organic compounds, and bulk chemical production. It can solve the problems of high transportation costs, high cost of cellulase, and high cost, and achieve high process energy utilization. , high ethanol yield and high selectivity

Active Publication Date: 2014-07-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose fermentation (patent CN101235392) ethanol production technology does not directly use grain and economic crops, which can effectively alleviate the problems of grain consumption and land occupation by grain fermentation. (2) The cost of cellulase is high, and the cost of cellulosic ethanol is still higher than that of grain ethanol

Method used

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  • Process for preparing ethanol from synthesis gas via methyl alcohol

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] 480,000 tons / year ethanol synthesis (based on 300 days of operation per year)

[0025] H 2 : CO=2:1, the output is 2.46 million m 3 / day syngas is divided into two parts, the first part is 1.23 million m 3 / day for methanol synthesis, the second part 1.23 million m 3 / day for CO and H 2 Separation, as a raw material for acetic acid synthesis and ethanol synthesis. Using the method disclosed in the patent CN102133498A to cryogenically separate CO and H in synthesis gas 2 , the production of CO after separation is 1.07 million m 3 / day, H 2 The output is 160,000 m 3 / sky.

[0026] Methanol synthesis adopts Lurgi tubular isothermal synthesis tower low-pressure synthesis process. The amount of raw material synthesis gas is 1.23 million m 3 / day, the temperature of the gas entering the tower after heat exchange is 225°C, and it directly enters the reaction tube of the synthesis tower from the upper part, and reacts under the action of a catalyst to form methan...

Embodiment 2

[0030] 280,000 tons / year ethanol synthesis (based on 300 days of operation per year)

[0031] H 2 : CO=2:1, the output is 1.48 million m 3 / day syngas is divided into two parts, the first part is 740,000 m 3 / day for methanol synthesis, the second part of 740,000 m 3 / day for CO and H 2 Separation, as a raw material for acetic acid synthesis and ethanol synthesis. Using the method disclosed in patent CN102191086A to separate CO and H in syngas 2 , the production of CO after separation is 640,000 m 3 / day, H 2 The output is 100,000 m 3 / sky.

[0032] Methanol synthesis adopts ICI multi-stage cold shock tower low-pressure synthesis process, the reaction tower is divided into 4 beds, and the catalyst uses ICI51-7 catalyst. The amount of raw material synthesis gas is 980,000 m 3 / day, the temperature of the gas entering the tower after heat exchange is mixed with part of the cold shock gas, and the temperature is 220°C, and enters the first bed layer from the top of the...

Embodiment 3

[0036] 360,000 tons / year ethanol synthesis (based on 300 days of operation per year)

[0037] H 2 : CO=2:1, the output is 1.85 million m 3 / day syngas is divided into two parts, the first part is 925,000 m 3 / day for methanol synthesis, the second part of 925,000 m 3 / day for CO and H 2 Separation, as a raw material for acetic acid synthesis and ethanol synthesis. Using the method disclosed in the patent CN102133498A to cryogenically separate CO and H in synthesis gas 2 , the production of CO after separation is 805,000 m 3 / day, H 2 The output is 120,000 m 3 / sky.

[0038] The methanol synthesis adopts the Linde spiral coil isothermal synthesis tower methanol synthesis process. The amount of raw material synthesis gas is 925,000 m 3 / day, the temperature of the gas entering the tower after heat exchange is 225°C, and it directly enters the reaction tube of the synthesis tower from the upper part, and reacts under the action of a catalyst to form methanol. The ...

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Abstract

The invention relates to a process for preparing ethanol from synthesis gas via methyl alcohol. The synthesis gas is divided into two parts, one part of the synthesis gas is used for methanol synthesis, and the other part is separated as CO (carbon monoxide) and H2 (hydrogen); the synthesis gas and methanol synthesis circulating tail gas are mixed into methanol synthesis material gas; the methanol synthesis material gas is subjected to methanol synthesis reaction under the action of a methanol synthesis catalyst to obtain the methyl alcohol and methanol synthesis circulating tail gas; the CO separated from the synthesis gas and acetic acid synthesis circulating tail gas are mixed and then subjected to carbonylation together with methyl alcohol; acetic acid synthesis reaction is carried out to obtain acetic acid and acetic acid synthesis circulating tail gas; the H2 separated from the synthesis gas is mixed with ethanol synthesis circulating tail gas to enter a reactor; the mixed gas and acetic acid contact the catalyst to carry out the ethanol synthesis reaction by hydrogenation so as to obtain ethanol and by-product and ethanol synthesis circulating tail gas, and a crude product at the outlet of the reactor is separated to obtain ethanol. The process disclosed by the invention has the advantages of high ethanol yield, high energy utilization rate of overall process, low cost and feasibility in mass production.

Description

technical field [0001] The invention relates to a process for preparing ethanol, in particular to a process for producing ethanol from synthesis gas through methanol. Background technique [0002] The energy consumption structure dominated by coal has made my country face many energy and environmental pressures such as energy security, environmental protection and sustainable development. Using my country's relatively abundant coal resources to develop non-petroleum-dependent energy and chemical technologies and industries to make up for the shortage of petroleum supply It is an important means to ensure China's energy security. [0003] Ethanol is a bulk chemical product, and more importantly, the advantages of ethanol as a fuel additive have become a global consensus. Many countries in the world have or are promoting the use of fuel ethanol. my country has always encouraged and supported the development of ethanol gasoline, and has introduced several support and subsidy p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/149C07C29/151
CPCY02P20/52
Inventor 李德宝肖勇陈从标
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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