Method for continuously adding catalyst for C5 petroleum resin production and special device

Abstract

The invention discloses a method for continuously adding a catalyst for C5 petroleum resin production and a special device. The method comprises the following steps of: adding the catalyst from a packing barrel into a first tank, delivering the catalyst in the first tank to a second tank, and delivering the catalyst in the second tank to a reaction kettle; when the catalyst in the second tank is used up, opening an emptying valve of the second tank to release pressure, and pressing the catalyst in the first tank into the second tank by using N2; after the catalyst is pressed, closing the emptying valve on the top of the second tank, and raising the pressure by using the N2 till the pressure is greater than the pressure of the reaction kettle; and adjusting the velocity of a rotary valve by using a variable frequency motor to control the adding flow rate when the catalyst is added, so that the catalyst is continuously and stably added, wherein the flow rate is displayed by an automatic weighing system of the second tank. By the method for continuously adding the catalyst, the catalyst can be continuously added, the reaction of resin is stable and mild, and corrosion of equipment is relieved.

Description

technical field [0001] The invention relates to a catalyst continuous adding method and a special device for C5 petroleum resin production. Background technique [0002] C5 Petroleum resin (C5 Petroleum resin) is a by-product carbon five fraction obtained from petroleum cracking to ethylene, which is polymerized in the presence of an acidic catalyst after rectification, decycling, and deweighting. The product has a narrow molecular structure, low odor, low volatility, good adhesion, heat resistance, stability, water resistance, acid and alkali resistance. It has good compatibility with phenolic resin, natural rubber, synthetic rubber and EVA, especially with styrene-butadiene rubber (SBR) and polybutene. Soluble in acetone, methyl ethyl ketone, ethyl acetate, dichloroethane, cyclohexane, benzene, toluene, solvent gasoline, etc. Tackifying resin for formulating pressure-sensitive adhesives, hot-melt pressure-sensitive adhesives, hot-melt adhesives and rubber-type adhesives....

AI Technical Summary

Problems solved by technology

[0003] However, at present, most of the resins produced in China have a small production scale, a single variety, and low product quality, especially the main quality indicators such as product chroma and softening point are unstable, and many devices are in a state of shutdown or semi-stop production

In recent years, the import volume of petroleum resin in our country has increased year by year. In view of this situation, after studying the various reaction conditions of the production of the device, it is found that the instability and discontinuity of the catalyst addition have a great impact on the product quality of the resin. Domestic At present, most resin manufacturers still add the catalyst manually, adding the catalyst to the reactor in 0.5 hours or 1 hour, which causes the resin to react unevenly. When the catalyst is just added, the reaction is violent and the reaction is relatively deep. When the activity of the catalyst is reduced, the reaction will be relatively slow. In order to ensure the yield of the product, a slightly excessive amount of catalyst must be added to ensure the completion of the reaction, which will cause the main quality indicators such as the color and softening point of the resin product to be unstable. Sometimes it is the same The quality of a batch of products cannot be consistent, resulting in a darker color and poor thermal stability of the resin, which greatly limits the scope of application

The obtained petroleum resin product has disadvantages such as wide relative molecular weight distribution and large number-average relative fractional mass (Mn). When it is used in road marking paint, the fluidity of the product is poor due to the high melt viscosity, and it is not easy to process and use. ;When used in adhesives, the effect of increasing viscosity is not significant

These disadvantages limit the application of petroleum resin products

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