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[Chemical Knowledge]：Production and manufacturing method and process of coal to ethylene glycol

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Manufacturing method
of coal -
ethylene glycol is an important raw material for chemical production, which is widely used in plastics, fibers, rubber, coatings, antifreeze, solvents and other fields. Coal to ethylene glycol is a method of preparing ethylene glycol by chemical reaction using coal as raw material. This article will introduce the manufacturing method of coal to ethylene glycol. The principle of

1. coal to ethylene glycol
The principle of
coal to ethylene glycol is to gasify coal to generate synthesis gas (CO and H2), and then convert the synthesis gas into ethylene glycol. The specific reaction process is as follows:

1. Coal gasification reaction generates syngas (CO and H2):
C H2O → CO H2

2. Syngas is purified to remove impurities.

3. Conversion of syngas to dimethyl oxalate (DMO):
CO 2H2 → CH3OH
2CH3OH CO → CH3OCOOCH3 H2O

4. Reaction of dimethyl oxalate with methanol to produce ethylene glycol:
CH3OCOOCH3 2H2 → HOCH2CH2OH CH3OH

2. of coal to ethylene glycol Process

of coal to ethylene glycol process mainly includes coal gasification, purification, dimethyl oxalate synthesis, dimethyl oxalate hydrogenation and other steps. The specific process is as follows:

1. Coal gasification
Pulverized coal is added into a gasification furnace, and steam is introduced to carry out gasification reaction to generate synthesis gas (CO and H2).

2. purification
synthesis gas contains some impurities, such as sulfide, nitride, etc., need to be purified. Physical and chemical absorption methods are generally used to remove impurities.

3. Dimethyl Oxalate Synthesis
The purified synthesis gas is introduced into a reactor, and a catalyst is added to carry out the synthesis reaction of dimethyl oxalate. The reaction produces dimethyl oxalate and methanol.

4. Hydrogenation
of dimethyl oxalate A mixture of dimethyl oxalate and methanol is introduced into a hydrogenation reactor, and a catalyst is added to carry out the hydrogenation reaction. The reaction produces ethylene glycol and methanol. The hydrogenation reactor generally requires certain temperature and pressure control to promote the reaction.

5. Refined
After the hydrogenation reaction, the resulting ethylene glycol mixture also needs to be refined to remove impurities therein and obtain a higher purity ethylene glycol product. Technical difficulties and solutions of

3. coal-to-ethylene glycol

There are some technical difficulties in the production process of coal-to-ethylene glycol, such as the activity, selectivity and life of the catalyst, the design and operation of the reactor. To solve these problems, the following solutions can be taken:

1. Select high-performance catalyst to improve the activity and selectivity of the catalyst and extend the service life of the catalyst.
2. Optimize the design and operating conditions of the reactor to improve the efficiency and stability of the reactor.
3. Strengthen the monitoring and control in the production process to ensure product quality and production safety.

4. conclusion

coal to ethylene glycol is an important raw material for chemical production, and its manufacturing method mainly involves coal gasification, purification, dimethyl oxalate synthesis, dimethyl oxalate hydrogenation and other steps. In the production process, some technical difficulties need to be solved, such as the activity, selectivity and life of the catalyst, the design and operation of the reactor. By selecting high-performance catalysts, optimizing the design and operating conditions of the reactor, and strengthening the monitoring and control measures in the production process, the efficient and stable production of coal-to-ethylene glycol can be realized.

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