邻苯二甲酸酐(又名苯酐,Phthalic anhydride)在常温下为结晶体。工艺过程常在密闭系统内生产,温度160℃呈融熔状态,(熔点131℃);从密闭系统热的苯酐离开液态后,很短时间内作为蒸气而存在,随后在常态下立刻形成微细结晶。因此,无论在苯酐的生产(反应、压片、出料),或使用(加料、反应)过程,均可接触苯酐的粉尘和蒸气。 Phthalic anhydride (aka Phthalic anhydride) is crystalline at room temperature. The process is often produced in a closed system, melting at a temperature of 160 ° C (melting point of 131 ° C), leaving the liquid as hot vapor from a closed system hot anhydride for a short period of time and then forming fine crystals immediately under normal conditions . Therefore, the phthalic anhydride dusts and vapors are accessible no matter in the production of phthalic anhydride (reaction, tabletting, discharging) or using (feeding, reacting) processes.