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[Chemical Knowledge]：Production and manufacturing method and process flow of pipeline natural gas

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The manufacturing method
of pipeline natural gas
1. Introduction

With the transformation of energy structure and the improvement of environmental protection requirements, pipeline natural gas as a clean and efficient energy has attracted more and more attention. In the field of raw materials for chemical production, the manufacturing method of pipeline natural gas is of great significance for improving the output and quality of natural gas, reducing costs and protecting the environment. This article will introduce in detail the manufacturing methods of pipeline natural gas, including raw material treatment, desulfurization and decarbonization, dehydration, compression and other technological processes.

2. raw material processing
The manufacture of
pipeline natural gas first needs to process the feed gas. The feed gas usually comes from an oil field, gas field or coal field, which contains impurities and moisture. Therefore, it is necessary to carry out purification treatment to ensure the quality and transportation safety of natural gas. Raw material processing mainly includes the following steps:

1. Dust removal: remove dust and mechanical impurities in the raw material gas by physical or chemical methods to prevent subsequent equipment wear and blockage.
2. Desulfurization: the absorbent is introduced into the absorption tower to react with the hydrogen sulfide in the feed gas and remove it to the specified index. Commonly used absorbents are iron oxide, zinc oxide, etc.
3. Dehydration: through the method of cooling and adsorption, the water in the feed gas is removed to the specified index to prevent the formation of hydrate at low temperature to block the pipeline.

3. desulfurization and decarbonization

desulfurization and decarbonization is an important link in the pipeline natural gas manufacturing process, mainly used to remove hydrogen sulfide and carbon dioxide and other acid gases in the feed gas. Commonly used desulfurization and decarbonization methods are the following:

1. Chemical absorption method: the use of absorbent and raw gas acid gas reaction, its removal. Commonly used absorbents are alcohol amines, sulfones, etc.
2. Physical absorption method: the use of physical solvents on the solubility of acid gas, its removal from the feed gas. Commonly used physical solvents are acetone, methanol and so on.
3. Membrane separation method: the acid gas is separated from the feed gas by using the selective permeability of the membrane.

4. dehydration

dehydration is an indispensable link in the pipeline natural gas manufacturing process. It is mainly used to remove the moisture in the feed gas and prevent the formation of hydrates to block the pipeline during transportation. Commonly used dehydration methods are the following:

1. Cooling method: By reducing the temperature of the raw gas, the water in it condenses into liquid water, thereby removing it. The method is simple and easy to operate, but the energy consumption is high.
2. Adsorption method: the water in the feed gas is removed by the adsorption of the adsorbent. Commonly used adsorbents are molecular sieve, silica gel, etc. This method has a good drying effect, but the adsorbent needs to be replaced regularly.

5. compression

In order to make the pipeline natural gas can be transported smoothly, it needs to be compressed to increase the pressure of the gas. Commonly used compressors are reciprocating, centrifugal and other types, according to the actual situation to choose the appropriate compressor for compression treatment.

6. Conclusion

In short, the manufacturing method of pipeline natural gas includes raw material processing, desulfurization and decarbonization, dehydration, compression and other processes. Each link needs to be strictly controlled to ensure the quality and transportation safety of natural gas. In the actual production process, the appropriate process and equipment should be selected according to the composition and actual situation of the raw gas, and the manufacturing efficiency and economic benefits should be continuously improved to provide more high-quality raw materials for chemical production.

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