顺酐（Maleic Anhydride）

Maleic Anhydride

定义：顺酐，也称为顺丁烯二酸酐，是一种化学物质，化学式为C4H2O3。

Definition: Maleic anhydride, also known as maleic anhydride, is a chemical substance with the chemical formula C4H2O3.

物理性质：

physical property:

无色或白色晶体，具有强烈的刺激性气味。

Colorless or white crystals with a strong irritating odor.

熔点为51-56℃，沸点为202℃。

The melting point is 51-56 ℃, and the boiling point is 202 ℃.

化学性质：

chemical property:

可溶于乙醇、乙醚和丙酮，但难溶于石油醚和四氯化碳。

Soluble in ethanol, ether, and acetone, but insoluble in petroleum ether and carbon tetrachloride.

可以与热水作用形成马来酸。

It can react with hot water to form maleic acid.

马来酸酐（Maleic Anhydride）

Maleic Anhydride

定义：马来酸酐实际上就是顺酐，又称失水苹果酸酐、顺丁烯二酸酐。

Definition: Maleic anhydride is actually maleic anhydride, also known as dehydrated malic anhydride or maleic anhydride.

物理性质（与顺酐相同）：

Physical properties (same as maleic anhydride):

无色或白色晶体，具有强烈的刺激性气味。

Colorless or white crystals with a strong irritating odor.

密度、熔点、沸点等物理常数与顺酐相同。

The physical constants such as density, melting point, and boiling point are the same as those of maleic anhydride.

化学性质（与顺酐相同）：

Chemical properties (same as maleic anhydride):

可溶于水和多种有机溶剂。

Soluble in water and various organic solvents.

具有强烈的刺激性气味。

Has a strong pungent odor.

在有机合成中，可用于制备多种化合物，如聚酯树脂、醇酸树脂等。

In organic synthesis, it can be used to prepare various compounds, such as polyester resin, alkyd resin, etc.

总结

summary

顺酐和马来酸酐实际上是同一种化学物质，只是称呼上有所不同。它们在物理性质和化学性质上完全相同，都是无色或白色晶体，具有强烈的刺激性气味，可用于多种有机合成和工业中。

Maleic anhydride and maleic anhydride are actually the same chemical substance, but their names are different. They have identical physical and chemical properties, both colorless or white crystals with strong pungent odors, and can be used in various organic synthesis and industrial production.

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