Current Location： Home > News > Chemical Knowledge > Production process and preparation method of dimethyl carbonate (DMC)

[Chemical Knowledge]：Production process and preparation method of dimethyl carbonate (DMC)

Read： 1458 Time：18months ago Source：Transform the World with Simplicity

Dimethyl carbonate is an important organic compound, which is widely used in chemical industry, medicine, electronics and other fields. This article will introduce the production process and preparation method of dimethyl carbonate. 1. the production process of dimethyl carbonate

The production process of dimethyl carbonate can be divided into two kinds: chemical method and physical method.
1. The chemical synthesis reaction equation for the chemical
of dimethyl carbonate by chemical method is: CH3OH CO2 → CH3OCO2CH3
where methanol is the raw material of dimethyl carbonate, carbonic acid gas is the reactant, and the reaction process requires a catalyst. There are many kinds of
catalysts, including sodium hydroxide, calcium oxide, copper oxide and carbonate. Among them, carbonate has the best catalytic effect, but the choice of catalyst should also take into account factors such as cost and environment. The production process of
dimethyl carbonate mainly includes methanol purification, oxygen oxidation, heating reaction, separation/distillation and other steps. In the reaction process, parameters such as temperature, pressure and reaction time need to be strictly controlled to improve the yield and purity.
2. Physical method The physical method of
dimethyl carbonate production mainly has two kinds of methods: absorption method and compression method. The
absorption method uses methanol as an absorbent and reacts with CO2 at a low temperature to produce dimethyl carbonate. The absorbent can be reused, and the carbon dioxide produced by the reaction can also be recycled, but the reaction rate is slow and the energy consumption is high. The
compression principle is to use the physical properties of CO2 and contact it with methanol under high pressure to achieve the preparation of dimethyl carbonate. The reaction rate of this method is fast, but it needs high-power compression equipment and high cost.
The above two methods have their own advantages and disadvantages, and can be selected according to application requirements and economic factors.

2. the preparation method
of dimethyl carbonate There are many methods for the preparation of dimethyl carbonate, two of which are commonly used methods are described below:
1. Methanol method
This is the most commonly used method for the preparation of dimethyl carbonate. The specific operation steps are as follows:
(1) adding methanol and potassium carbonate/sodium carbonate, and heating to the reaction temperature while stirring;
(2) slowly adding CO2, continuously stirring, and cooling after the reaction is completed;
(3) separating the mixture with a separating funnel to obtain dimethyl carbonate.
, it should be noted that the temperature, pressure, reaction time, and the type and amount of catalyst need to be controlled during the reaction to improve the yield and purity.
2. oxygen oxidation
in addition to methanol method, oxygen oxidation method is also commonly used in the preparation of dimethyl carbonate. The method is simple to operate and can realize continuous production. The specific operation steps of the
are as follows:
(1) adding methanol and a catalyst, and heating to the reaction temperature while stirring;
(2) adding oxygen gas into the reaction system, and continuously stirring;
(3) performing separation, rectification and purification on the reaction mixture to obtain dimethyl carbonate. It should
be noted that the oxygen oxidation method needs to control the supply rate of oxygen gas and the reaction temperature, as well as the ratio of reaction components and other parameters to improve the yield and purity.

Through the introduction of this article, we can understand the production process and preparation method of dimethyl carbonate. From the molecular structure to the reaction process, the detailed description of the production method, all provide us with a comprehensive and accurate knowledge system. It is hoped that this paper can enlighten readers in this field of study and research.