苯酐、顺丁烯二酸酐(简称顺酐)和甲胺是三种主要的有机化工原料,目前市场上都比较紧俏,发展前景看好,但切忌盲目上马。 苯酐 70年代以前国内苯酐生产主要以萘法为主,70年代末期邻二甲苯法有所发展,但占比例很小。80年代初期我国从国外引进了3套规模较大的邻二甲苯法苯酐生产装置,分别建在 Phthalic anhydride, maleic anhydride (abbreviated as maleic anhydride) and methylamine are the three major organic chemical raw materials. Currently, they are all relatively tight in the market and have promising development prospects. However, they should not be blindly launched. Phthalic anhydride Before the 1970s, domestic production of phthalic anhydride was mainly based on naphthalene, and in the late 1970s, o-xylene was developed, but the proportion was small. In the early 1980s, China imported three sets of large-scale o-xylene phthalic anhydride production facilities from abroad,