二氯甲烷是一种无色、透明、易挥发的液体，广泛应用于涂料和固定膜中。二氯甲烷可用作溶剂，而不是二甲苯等苯。它可用于制造不含苯的香蕉水、丁娜水，并可与苯、酮、酯等有机溶剂溶解。它也可用于制备油漆、油墨和稀释剂。是一种很好的稀释生产原料。下面来讲讲二氯甲烷的制备与合成事项。

Dichloromethane is a colorless, transparent and volatile liquid, which is widely used in coatings and fixed films. Dichloromethane can be used as a solvent instead of benzene such as xylene. It can be used to produce banana water and butana water without benzene, and can be dissolved with benzene, ketone, ester and other organic solvents. It can also be used to prepare paints, inks and thinners. It is a good raw material for dilution production. Let's talk about the preparation and synthesis of dichloromethane.

天然气氯化法：

Natural gas chlorination method:

天然气与氯气反应，经水吸收氯化氢副产物盐酸后，用碱液除去残留的氯化氢，然后干燥，压缩，浓缩，蒸馏得到成品，其中氯气为100％4000，天然气（标准条件下），甲烷含量为97％1000m3/t，液态碱为100％274。

Natural gas reacts with chlorine gas. After absorbing hydrochloric acid, the by-product of hydrogen chloride by water, the residual hydrogen chloride is removed with alkali liquor, and then dried, compressed, concentrated, and distilled to obtain the finished product, in which chlorine gas is 100% 4000, natural gas (under standard conditions), methane content is 97% 1000m3/t, and liquid alkali is 100% 274.

氯甲烷氯化法：

Methyl chloride chlorination method:

①光氯化是氯甲烷与氯气在4000kW光下的反应，将反应产物洗涤，压缩，浓缩，干燥，精馏得到成品；

① Photochlorination is the reaction of methyl chloride and chlorine under 4000kW light. The reaction products are washed, compressed, concentrated, dried and rectified to obtain the finished products;

②热氯在化学过程中，按照（2-2.5）：1（质量）混合氯甲烷和氯气，并在400℃的反应温度和0.2MPa的反应压力下进行反应。将反应产物洗涤，用碱洗涤，压缩，浓缩，干燥和精馏以获得终产物。

② In the chemical process of hot chlorine, methyl chloride and chlorine are mixed according to (2-2.5): 1 (mass), and react at a reaction temperature of 400 ℃ and a reaction pressure of 0.2MPa. The reaction product is washed, washed with alkali, compressed, concentrated, dried and rectified to obtain the final product.

工业上通常通过甲烷的氯化来合成。甲烷氯化生成四种氯甲烷的混合物。但是，由于它们的沸点之间的距离较大，因此可以通过普通的分馏技术方便地分离和纯化。

In industry, it is usually synthesized by chlorination of methane. Chlorination of methane produces a mixture of four methyl chloride. However, due to the large distance between their boiling points, they can be easily separated and purified by common fractionation technology.

温馨提示：二氯甲烷在储存过程中，由于装在铁桶中，二氯甲烷与铁发生反应，使二氯甲烷溶液变色。因此，在装填时，必须选择合适的容器，以避免溶液反应的挥发，使其性能不能得到应用。

Warm tip: During the storage of dichloromethane, the dichloromethane reacts with iron because it is packed in an iron bucket, making the dichloromethane solution discolor. Therefore, proper containers must be selected during filling to avoid volatilization of solution reaction and prevent its performance from being applied.

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The above is the content about the preparation and synthesis of dichloromethane introduced to you. If you have any questions about it, please come to our website http://www.jinhao360.com , we will have special technicians to explain to you.