What are the manufacturing processes of homophthalic dianhydride?
Published on:
2022-01-10
Homophthalic dianhydride is an important intermediate that is widely used in a number of applications, such as polyesters, resins, fibers, etc. As the demand for its application continues to increase, its production process is receiving more and more attention. In this paper, we will introduce several common production processes of homophthalic dianhydride. 1. 单相溶解 - 氧化法 该工艺是目前Z常用的生产工艺，其原理是将苯和四甲醚混合后，加入催化剂和氧气进行氧化反应。在反应的过程中，产生的气体会在溶液中产生气泡而不影响反应的进行。反应后，通过普鲁士蓝试剂判断反应是否达到预期效果。Z终得到均苯四甲酸二酐的产率约为85％。这个方法的优点在于操作简单易懂，容易进行批量生产，缺点是反应过程中存在有害气体排放。
Homophthalic dianhydride is an important intermediate that is widely used in a number of applications, such as polyesters, resins, fibers, etc. As the demand for its application continues to increase, its production process is receiving more and more attention. In this paper, we will introduce several common production processes of homophthalic dianhydride.
1. Single-phase dissolution-oxidation method
This process is currently the most common production process. The principle is to mix benzene and tetra methyl ether and then add catalyst and oxygen to carry out the oxidation reaction. In the process of reaction, the gas generated will produce bubbles in the solution without affecting the reaction. After the reaction, the reaction is judged by Prussian blue reagent whether the expected effect is achieved or not. z The final yield of homophthalic dianhydride is about 85%. The advantage of this method is that it is easy to understand the operation and easy to carry out mass production. The disadvantage is that there are harmful gas emissions during the reaction.
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