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The important steps in the process of petroleum resin

author£ºadmin Date£º2016/12/7 18:18:03

There are several important steps in the petroleum resin process - selecting and pre-treating the feed stock, polymerizing, neutralizing and separating the treated feedstock. In particular, the pre-treatment is indispensable to remove undesirable substances in advance and then select the different composition of the feed to adjust the resin properties; polymerization is different with the use of raw materials AlCl3, BF3 and some accelerators, such as HCl, t -BuCl, H2O or phenol, or by heating. The main reaction parameters in the process are the total or relative concentration of the feed, the catalyst type and its concentration, and the temperature. More than a few must be carefully controlled in order to have a good yield, molecular weight and molecular weight distribution.

Polymerization can be divided into batch, continuous, multi-stage continuous. In which the molecular weight of the batch reaction is broad, and the yield of the multistage continuous type is high and the molecular weight distribution is narrow. Raw materials deployment in the petroleum resin process is a very important part, through the deployment of different fractions of the feed oil, can adjust its molecular structure and the appearance of the finished product nature. For example, C5 and C9 copolymerization or adding part of the pure monomer as a modification, in addition to the adjustment of petroleum resin products polarity or acid value, can also be added to the raw material of maleic anhydride (MA), phenol and rosin (rosin) And other chemical composition, or the use of grafting fraction of oil resin connected to acid.