What is the difference between dry distillation of coal and coal gasification?

Dry distillation is a physical change, and the composition does not change. Gasification is a chemical reaction that turns coal into gas, and the composition changes. China Coal Information Network.

Quite simply, dry distillation is a physical change, and no new substances are generated; Gasification is a chemical change, new substances are formed, molecules change, and the type and number of atoms remain the same.

The products of coal dry distillation are coal, coal tar, and coal gas. Coal gasification refers to the process of converting solid coal into combustible gases containing CO, H2, CH4 and non-combustible gases such as CO2 and N2 under a certain temperature and pressure in specific equipment.

Dry distillation of coal is a chemical change that is the process of decomposing coal by increasing heat in isolation from air. It is also called coking in industry, and there are two main types of ingredients: furnace gas and coke. There are many components of baking gas.

Because there is the breaking of the old bond and the formation of a new bond. But the process must be accompanied by physical changes. The principle is the decomposition of coal at high temperatures, which is completely different from the principle of petroleum fractionation.

The process of isolating coal from air and strengthening heat to decompose it is called dry distillation of coal, also known as coking of coal. When coal isolates the air from strong heat, gas is generated, and its composition is coal tar, coke oven gas, crude ammonia, and coarse stupidity.

The black solid material after the reaction is called coke. They are all very important chemical raw materials. Therefore, dry distillation of coal can give full play to the use value of coal to a greater extent. It saves energy and protects the environment, so it is very important to actively carry out the comprehensive utilization of coal.

Coal dry distillation: It is one of the important processes of coal chemical industry. It refers to the process of heating and decomposing coal under the condition of isolated air to produce coke (or semi-coke), coal tar, crude benzene, coal gas and other products.

According to the difference in the final temperature of heating, it can be divided into three types: 900 1100 is high-temperature dry distillation, that is, coking; 700 900 for medium temperature dry distillation; 500 600 is low-temperature dry distillation (see Coal Low Temperature Distillation). The dry distillation of coal is a chemical change.

The products of coal dry distillation are coke, coal tar, and coal gas.

Differences: 1. The operation is different.

The dry distillation of coal refers to the process of isolating coal from air and strengthening heat to decompose it, which is also called coking of coal in industry, and important chemical raw materials can be obtained from coal dry distillate; The gasification of coal is the process of converting it into a natural gas, and the main reaction is the reaction of carbon and water vapor to form water gas, etc.

2. The reaction principle is different.

The dry distillation of coal is a chemical reaction.

The gasification of coal is a physical and chemical reaction, including pyrolysis, gasification, and combustion reactions of coal.

3. The products are different.

Dry distillation is heated and decomposed to produce coal gas, tar, crude benzene and coke; Gasification produces combustible and non-combustible gases, etc.

The products of coal dry distillation are coal, coal tar, and coal gas. Coal gasification refers to the process of converting solid coal into combustible gases such as CO, H2, CH4 and non-combustible gases such as CO2 and N2 under a certain temperature and pressure in specific equipment.

The dry distillation of coal is a process of heating and decomposing with oxygen insulation to produce coke or semi-coke, coal tar, crude benzene and other products, which is a chemical change.

The dry distillation of coal belongs to chemical changes, but to distinguish it from the distillation of coal, it is necessary to know that distillation is to use the principle of different boiling points of various substances to purify and remove impurities, and unlike dry distillation, distillation belongs to physical changes.

Dry distillation is the process of coal heating change under the condition of isolated air, coal has complex changes in the dry distillation process, which is mainly the change of coal properties in the dry distillation process, in the study of the dry distillation process, the main thing should be to understand the particle size change of coal, softening and thermal decomposition, coking, etc. The dry distillation of coal is also known as the coking of coal.

Dry distillation is a complex chemical reaction process, including dehydration, pyrolysis, dehydrogenation, thermal condensation, hydrogenation, coking, and other reactions. Although the dry distillation process of different substances is different, it can generally be divided into three stages. At the beginning of the dry distillation operation, the temperature is relatively low, and the organic matter is first dehydrated, and as the temperature increases, it gradually decomposes to produce low molecular weight volatiles.

As the distillation temperature continues to rise, the macromolecules in the organic matter undergo bond breakage, that is, pyrolysis occurs to obtain liquid organic matter. These distillate products vary depending on the distillate material, such as furfural from chaff husks, shale oil and some heterocyclic compounds from distillate shale.

When the temperature is further increased, with the precipitation of water and organic vapors, the remaining material is heat condensed into colloids. At the same time, the precipitated volatiles gradually decreased, and the colloids gradually solidified and carbonized. As the temperature increases and the heating time increases, the carbon content of the solid products produced gradually increases, and the content of other elements such as hydrogen, oxygen, nitrogen and sulfur gradually decreases.