邻苯二甲酸和苯甲酸有什么区别

Thekey difference between phthalic acid and terephthalic acidis that phthalic acid is anisomerof benzenedicarboxylic acid having官能团在矫正位置，而苯二甲酸是具有官能基在PARA位置的苯二羧酸的异构体。

Benzenedicarboxylic acid can be described as a group of chemical compounds that has two carboxylic acid functional groups attached to a benzene ring, so we can call them dicarboxylic derivatives of苯。该类别的三种异构形式包括邻苯二甲酸，同噬酸和苯二甲酸。

内容

1.Overview and Key Difference
2.What is Phthalic Acid
3.What is Terephthalic Acid
4.Phthalic Acid vs Terephthalic Acid in Tabular Form
5.摘要 - 邻苯二甲酸与苯甲酸

什么是邻苯二甲酸？

Phthalic acid can be described as an aromatic dicarboxylic acid having the chemical formula C₆H₄(COOH)₂。The closely related phthalic anhydride is the most common form of phthalic acid, having important uses. It is a commodity chemical that is formed on a large scale. This acidic compound is one of the three isomers of benzenedicarboxylic acid. The other two isomers are isophthalic acid and terephthalic acid.

This substance appears as a white solid, and its density is about 1.59 g/mol. It has a melting point of about 207 degrees Celsius, and its solubility in water is poor. The other chemical names for phthalic acid include 1,2-benzenedioic acid, benzene-1,2-dioic acid, ortho-phthalic acid, etc.

We can produce phthalic acid from the catalytic oxidation ofnaphthaleneor ortho-xylene. This directly forms phthalic anhydride. Its subsequent hydrolysis can also occur in the anhydride.

This chemical compound was first introduced by the French Chemist Auguste Laurent in 1836. This was performed by oxidizing naphthalene tetrachloride. He believed the compound coming from this reaction to be a naphthalene derivative, which led him to name it naphthalic acid. However, the chemical name was corrected later by a Swiss chemist, Jean Charles Galissard de Marignac.

What is Terephthalic Acid?

Terephthalic acid is an aromatic organic compound having the chemical formula C₆H₄(CO₂H）₂。It has a para conformation. It occurs as a white crystalline powder. Moreover, it is insoluble in water but soluble in polar organic solvents. The chemical name of this substance is 1,4-benzenedicarboxylic acid.

When considering the production of terephthalic acid, the major production process is the Amoco process. Here, the acid is produced via oxidation of p-xylene in the presence of oxygen in the air.

There are many uses of terephthalic acid. For example, it is useful as a precursor for PET production (polyethylene terephthalate), used in paints as a carrier compound, as a raw material for certain drugs in pharmaceutical applications, as a filler in certain military smoke grenades, etc.

邻苯二甲酸和苯甲酸有什么区别?

邻苯二甲酸和苯二甲酸是两个主要异构体的苯甲酸羧酸化合物。邻苯甲酸和苯二甲酸之间的关键区别在于，邻苯甲酸是重要的有机化合物，是在正位位置具有官能团的苯二羧酸的异构体，而苯二甲酸是重要的有机化合物，在具有苯基辅助盒的偶尔组中，是苯二甲酸甲酸的一个重要有机酸。para位置。

The following table summarizes the difference between phthalic acid and terephthalic acid.

摘要 - 邻苯二甲酸与苯甲酸

苯二羧酸是一组化合物，具有两个羧酸官能团，该羧酸官能团附着在苯环上。邻苯二甲酸和同噬酸是其两种同构形式。因此，邻苯二甲酸和苯二甲酸之间的关键差异是邻苯二甲酸具有官能基处的位置，而苯二甲酸则具有其官能团在PARA位置。

Reference:

1.“”Phthalic Acid。”VEDANTU, 27 Apr. 2022.

Image Courtesy:

1.“”Phthalic acid” (Public Domain) via Commons Wikimedia
2. “苯甲酸-ACID-2D-skeletal” By Jynto – Own work (Public Domain) via Commons Wikimedia