An alkyd resin has been developed with chemical fiber waste residue as raw material in replacingof phthalic anhydride at the presence of a new catalyst.
采用了一种新型的催化剂,以化纤废渣为原料代替苯酐生产醇酸树脂。
2
A route suitable for industrial production of secnidazole was improved, in which boron trifluoride etherate was used in replacing sulfuric acid as the catalyst.