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Chemical Reagent Study: Synthesis of P-Tert-Butyl Benzoic Acid(PTBBA) by Nitric Acid Oxidation Method

P-Tert-Butyl Benzoic Acid PTBBA is an important intermediate for organic synthesis. As Alkyd resin’s modifier, it can improve the resin gloss, color , and speed up the drying of the resin. Its ammonium salt can improve the performance of the friction parts and prevent rust. Therefore, it is used as additives of cutting oil and lubricating oil. The sodium salt, barium salts and zinc salts can be used for polymer stabilizers and nucleating agents
P-Tert-Butyl Benzoic Acid (PTBBA)’s synthesis methods are: Liquid solvent oxidation method. Acetic acid acts as the solvent and Lead acetate as the oxidant. P-Tert-Butyl Benzoic Acid (PTBBA) is synthesized at low temperatures; Liquid non- solvent oxidation method. Without any solvent, Cobalt acetate and Sodium bromide are used as a catalyst. At 170E temperature, the air act as oxidant to make P-Tert-Butyl Benzoic Acid (PTBBA); High-temperature gas phase oxidation method. With the help of catalyst, high temperature make P-Tert-Butyltoluene oxidized to output P-Tert-Butyl Benzoic Acid (PTBBA). In addition, there is the electrochemical oxidation method. Developed countries had already products on the market long time ago. However, there is no complete production process appear at home. Thus, the development of a new economical and practical technology has a very important economic significance.
Recently, a new economical and practical synthesis method has been found. Using cheap and easy reached Nitric Acid as oxidant to oxidize P-Tert-Butyltoluene, without any catalyst , P-Tert-Butyl Benzoic Acid (PTBBA) crude product could be obtained. To remove organic impurities and insolubles, dissolve crude P-Tert-Butyl Benzoic Acid (PTBBA) with sodium hydroxide. After acidification, pure P-Tert-Butyl Benzoic Acid (PTBBA) would output. This method has the advantages of high one-time conversion rate, good selectivity and low energy consumption. It also avoids shortcomings of air oxidation method, like low conversion rate, and has great practical value.