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Catalyst, solvent and raw material requirements for the preparation of C5 petroleum resin

author£ºadmin Date£º2016/12/14 17:44:04

C5 petroleum resin fraction cationic polymerization can be used a variety of catalysts, the most studied was Friedel-Craft catalytic system. AlCl3, AlBr3, BF3, TiCl4 and SnCl4 are the main catalysts. AlCl3, AlBr3 and BF3 are the most widely used in industrial production. Using BF3 catalyst is a liquid resin or oligomer; and the use of AlCl3 catalyst is a high molecular weight, fragile solid resin. For the concentration of the catalyst, AlCl3 is generally 1 to 2.5% (m /m) of the reactants, the BF3 gas is 0.3 to 0.78% and the BF3 ether complex is 0.6 to 1.5%. For these two catalysts the higher the concentration, the lower the molecular weight of the resin.

C5 petroleum resin used in the preparation of aromatic solvents and alkanes, aromatics can effectively inhibit the C5 fractions in the polymerization process of the side reaction - cross-linking reaction, so the industrial production of solvents used in aromatic or aromatic modified stone Brain oil (aromatics content of 5%).

Raw material requirements:
In order to obtain high-quality C5 petroleum resin (piperylene petroleum resin), it is necessary to the basic composition of raw materials have certain requirements, the requirements of raw materials pentadiene concentration of 50 ~ 75%. In order to ensure the chroma and thermal stability of C5 petroleum resin, the content of cyclopentadiene and dicyclopentadiene in the raw materials of pentadiene should be as low as possible, usually less than 2%. If the content of cyclopentadiene and dicyclopentadiene is high, the color, thermal stability and viscosity of C5 petroleum resin will be deteriorated, and the gel will be easily produced. At the same time requires isoprene content of not more than 3%, because the isoprene content is high, the double bond of lively can cause excessive crosslinking of C5 petroleum resin, the resin solubility, compatibility, molecular weight is not easy to control. In addition, the concentration of pentadiene in the feedstock should not exceed 85%, otherwise the resin system will become unstable.