What is the common name for CH3OCH3?

Do you know the generic name of the CH3OCH3? It is dimethyl ether, also known as methyl ether, referred to as DME, and its molecular and structural formula intuitively reveals its chemical composition: CH3OCH3 or CH3-O-CH3. Dimethyl ether, as a flammable gas, can form an explosive mixture when mixed with air, which can easily cause combustion or even explosion once it encounters heat, sparks, flames or oxidants. It also generates peroxides with a potential explosion risk when exposed to light or air. Because it is denser than air, dimethyl ether can spread over long distances in low-lying areas, and may cause back-ignition once it encounters an ignition source. In addition, if exposed to high temperatures, the pressure inside the container will rise sharply, and there is a risk of cracking or even explosion. Despite this, dimethyl ether is still regarded as a vital clean energy and chemical feedstock.

The production process of dimethyl ether is mainly divided into one-step method and two-step method. The one-step method, that is, the one-time synthesis of dimethyl ether from the raw gas, eliminates the intermediate links. The two-step method is to produce methanol from syngas first, and then dehydrate methanol to obtain dimethyl ether. Next, we'll explore both methods in detail:

1. One-step method of dimethyl ether production line

The method is made by natural gas conversion or coal gasification to produce syngas, the syngas enters the synthesis reactor, and the methanol synthesis and methanol dehydration two reaction processes and transformation reactions are completed in the reactor at the same time, the product is a mixture of methanol and dimethyl ether, the mixture is separated by the distillation device to obtain dimethyl ether, and the unreacted methanol is returned to the synthesis reactor.

The one-step method mostly uses bifunctional catalysts, which are generally physically mixed by two types of catalysts, one of which is the synthesis of methanol catalysts, such as Cu-Zn-Al(O)-based catalysts, BASFS3-85 and ICI-512. The other type is methanol dehydration catalysts, such as alumina, porous SiO2-Al2O3, Y-type molecular sieve, ZSM-5 molecular sieve, mercerized zeolite, etc.

2. Two-step method for dimethyl ether production

The process is carried out in two steps, i.e., methanol is synthesized from syngas, and methanol is dehydrated under a solid catalyst to produce dimethyl ether. ZSM-5 zeolite containing γ-Al2O3/SiO2 is mostly used as a dehydration catalyst at home and abroad. The reaction temperature is controlled at 280~340°C, and the pressure is 0.5-0.8MPa. The single-pass conversion rate of methanol is between 70-85%, and the selectivity of dimethyl ether is greater than 98%.

Compared with the two-step method, the one-step synthesis of dimethyl ether does not have the intermediate process of methanol synthesis, and its process flow is simple, the equipment is less, the investment is small, and the operating cost is low, so that the production cost of dimethyl ether is reduced and the economic benefits are improved. Therefore, the one-step synthesis of dimethyl ether is a hot spot for development at home and abroad. The representative one-step process developed abroad includes: Danish Topsφe process, American Air Products process and Japanese NKK process.

At present, the two-step dimethyl ether production process has been very mature and has been widely used in industrial production.

The two-step synthesis of dimethyl ether is the main process of dimethyl ether production at home and abroad in the 21st century, the method uses refined methanol as raw material, less by-products of dehydration reaction, dimethyl ether purity of 99.9%, mature process, wide adaptability of device, simple post-treatment, can be directly built in methanol production plants, can also be built in other non-methanol production plants with good public facilities. However, the method needs to go through methanol synthesis, methanol distillation, methanol dehydration and dimethyl ether distillation, etc., and the process is long, so the equipment investment is large.

The main use of dimethyl ether in China is as a promoter of aerosols, aerosols and spray coatings, and there is a broad consumer market. Due to the rapid development of China's aerosol industry, the market is expected to expand further in the future.

Dimethyl ether has a wide range of applications, and can be found in new energy, food, agriculture, industry, coatings and adhesives. Jiurunfa Chemical Technology Co., Ltd. manufactures and sells dimethyl ether series products, our production capacity is strong, product quality is guaranteed, with an annual output of 300,000 tons of dimethyl ether (99.0%) and 50,000 tons of high-purity dimethyl ether (99.99%). If you have a need, please contact us and look forward to cooperating with you.

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