Catalytic Synthesis Of Cobalt Phthalocyanine And Preparation Research Of Binuclear Cobalt Phthalocyanine

Cobalt phthalocyanine catalysts are widely applied in oil refining industry at present to remove marcaptans from petro-leum products by means of catalytic oxidation, and cobalt phthalocyanine is the basic unit of this sort of catalyst. It is important to study the catalytic synthesis of cobalt phtha-locyanine and synthetic mechanism in cobalt phthalocyanine catalyst synthesis.The article introduced the catalytic synthesis of cobalt phthalocyanine from phthalic anhydride and urea. The effects of active oxides, ammonium salt, tungsten compound, chromium compound, molybdenum compound and of their dosages on the cobalt phthalocyanine synthesis were studied, and binuclear cobalt phthalocyanine sulfonate catalyst with high water solubility and alkali solubility was synthesized. The samples were analyzed by means of XRD, XRF, GC/MS, DTA, CRN elements analyzer, CS analyzer and chemical analysis, etc. The synthetic mechanism of cobalt phthalocyanine was researched.The results showed that different catalysts and their dosages influenced evidently the yield of cobalt phthalo-cyanine. Among all the catalytic materials, molybdenum compound was the best. When the dosages of ammonium molybdate and sodium molybdate were 3. 5 times of the basic amount, and the dosage of molybdenum trioxide was 3.0 times of the basic amount, the best catalytic effect could be gotten.Based on the analytical result of GC/MS and so on, it was found firstly that in the synthesis of cobalt phthalocyanine, phthalic anhydride was converted to phtha- liranide, then to 2-cyanobenzamide, which was an intermediate, lastly the intermediate changed to 1, 3-diiminoindoline. The intermediate was not 1-iminiisoindoline, which was considered by priorreference and researchers. It was found that the pyrogenic decomposition of urea proceeded in two ways. A way was that urea was decomposed to NHs and HN=C=0, another way was that urea was decomposed to H20 and HN=ONH. The former was the predominant way, which supplied the theoretical foundation for optimizing process parameters of synthesis of cobalt phthalocyanineIt is difficult to obtain phthalocyanine only by heating phthalic anhydride and urea, but if metallic cations containing compounds, such as compounds containing Cu(I), Co (II) nuclear cation and so on, were present the phthlocyanine compound containing these nuclear cations could be gotten only by heating. That showed nuclear cations could promote the polymerization of 1, 3-diiminoisoindoline.Binuclear cobalt phthalocyanine ammonium sulphonate and binuclear cobalt phthalocyanine sodium sulphonate were synthesized. Synthesis experiments showed that the synthesis of binuclear cobalt phthalocyanine sulphonate was affected notably by many factors, such as sulphonation temperature, reaction time, acid used in sulphonation and its dosage, the dosage of various feed and the dosage of catalysts.Compared to sulfophthalocyanine cobalt and polyphthalo-cyanine cobalt, the sweetening performance and the alkali solubility of binuclear cobalt phthalocyanine sulphonate are equivalent, the water solubility and product yield are much better, the dosage of smoking acid was much less. Furthermore, the synthesis process of binuclear cobalt phthalocyanine sulphonate is environment friendly, because it doesn' t drain off wastewater and waste acid.