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[Chemical Knowledge]：Production and manufacturing method and process flow of n-butanol

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The manufacturing method
of n-butanol
1. Introduction

n-Butanol is an important organic chemical raw material, widely used in solvents, plasticizers, pharmaceuticals, pesticides and other fields. With the continuous development of science and technology, the manufacturing method of n-butanol is constantly improved and optimized. This article will introduce the manufacturing methods of n-butanol, including fermentation method, acetaldehyde method, ethylene method, etc.

2. fermentation method

fermentation method is one of the traditional methods for the production of n-butanol, mainly starch, molasses, cellulose and other carbohydrates as raw materials, through the fermentation of microorganisms, carbohydrates into n-butanol. The specific steps are as follows:

1. ingredients: starch or molasses and other carbohydrates mixed with water, prepared for microbial growth medium.

2. Sterilization: The medium is sterilized at high temperature to kill the bacteria in it.

3. Inoculation: The domesticated microbial strains are inoculated into the culture medium.

4. Fermentation: Under suitable conditions, microorganisms convert carbohydrates to n-butanol.

5. Separation: n-Butanol is separated from the fermentation broth by distillation and other methods. The advantages of

fermentation method for the production of n-butanol are that the raw materials are readily available and the cost is low, but the disadvantages are that the production cycle is long, the yield is low, and it is easily contaminated by miscellaneous bacteria.

3. acetaldehyde method

acetaldehyde method is one of the main methods for the production of n-butanol, mainly with acetaldehyde and hydrogen as raw materials, in the role of catalyst, hydrogenation reaction to produce n-butanol. The specific steps are as follows:

1. ingredients: acetaldehyde and hydrogen are mixed in a certain proportion.

2. Hydrogenation reaction: Under the action of catalyst, acetaldehyde and hydrogen are hydrogenated to produce n-butanol.

3. Separation: n-Butanol is separated from the reaction solution by a method such as distillation.
the advantages of
acetaldehyde method to produce n-butanol are high production efficiency, large yield and high product purity, but the disadvantage is that the raw material cost is high and the catalyst needs to be used.

4. ethylene method

ethylene method is one of the new methods for the production of n-butanol, mainly with ethylene and synthesis gas (CO and H2) as raw materials, through the carbonyl synthesis reaction to produce n-butyl aldehyde, and then the n-butyl aldehyde hydrogenation to produce n-butanol. The specific steps are as follows:

1. ingredients: mix ethylene and synthesis gas according to a certain proportion.

2. Oxo synthesis reaction: Under the action of catalyst, ethylene and synthesis gas are carried out to generate n-butyraldehyde.

3. hydrogenation reaction: the n-butyraldehyde hydrogenation reaction to generate n-butanol.

4. Separation: n-Butanol is separated from the reaction solution by a method such as distillation. The advantage of

ethylene method to produce n-butanol is that it can use the by-products of the petrochemical industry ethylene and synthesis gas as raw materials, reduce costs, and high production efficiency, but the disadvantage is the need to use a catalyst, and the equipment requirements are higher.

5. Conclusion There are many methods for the manufacture of n-butanol in

, including fermentation, acetaldehyde and ethylene. Different methods have their own advantages and disadvantages, and suitable production methods can be selected according to the actual situation. In the future, with the continuous progress of science and technology and the continuous improvement of environmental protection requirements, the manufacturing method of n-butanol will continue to optimize and improve, improve production efficiency, reduce energy consumption and pollution, and create greater economic and social benefits for enterprises.

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