Hydrogenation method of high-chlorine C9 petroleum resin

Abstract

The invention discloses a hydrogenation method of high-chlorine C9 petroleum resin, which comprises the following steps: (1) feeding a dissolved C9 petroleum resin raw material into a dechlorination tower of a first-stage hydrogenation reactor, and carrying out hydrogenation adsorption dechlorination reaction; (2) feeding the first-stage reaction product into a desulfurization tower of a second-stage hydrogenation reactor, and carrying out a hydrogenation adsorption desulfurization reaction; (3) feeding the second-stage reaction product into a third-stage hydrogenation reactor decolorizing tower, and carrying out olefin and aromatic hydrocarbon hydrogenation saturation reaction; and (4) enabling the third-stage reaction product to sequentially pass through a stripping tower, a normal-pressure distillation tower and a reduced-pressure distillation tower to obtain hydrogenated C9 petroleum resin. The method has the characteristics of simple process, low hydrogenated resin chroma and highresin yield.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation of petroleum resins, and relates to a method for hydrogenation of high-chlorine C9 petroleum resins. Background technique [0002] C9 petroleum resin is a light yellow to dark brown functional resin with a relative molecular weight of 200-3000 and a softening point of 80-140°C. It is a glassy thermoplastic solid at room temperature. At present, the main source of preparing C9 petroleum resin is the by-product of petroleum cracking ethylene. Due to the complex composition of cracking raw materials and the relatively backward production process and production technology of petroleum resin, petroleum resin has deep color and poor stability, especially double bonds, benzene rings, etc. And the presence of a small amount of impurities such as S and N affects the color, stability and compatibility with other resins of the resin, which limits its application range. Hydrogenation of resin is one of...

AI Technical Summary

Problems solved by technology

[0007] Patent CN105175633A introduces a combined petroleum resin hydrogenation treatment method, which uses alumina and activated carbon to adsorb the resin liquid at high temperature to remove impurities such as sulfur and chlorine in the resin, and then performs two-stage hydrogenation However, in this method, a separator must be installed between the first stage and the second stage hydrogenation reactor, and the resin liquid needs to pass through the separator to separate harmful gases such as hydrogen sulfide and hydrogen chloride in the hydrogenation product before entering the second stage main hydrogenation reactor. Not only the process is cumbersome, but also causes increased energy consumption

[0008] To sum up, at present, for the hydrogenation of high-chlorinated C9 petroleum resin, nickel-molybdenum, cobalt-molybdenum and other sulfurized catalysts can be used for hydrogenation of one-stage hydrogenation, which has strong resistance to impurities such as sulfur and chlorine, excellent stability and long service life. , its disadvantage is that it needs to show better catalytic activity at a higher reaction temperature, and it is easy to cause thermal degradation of C9 petroleum resin, which is not conducive to the improvement of product quality

If a nickel-based reduced state catalyst is used for one-stage hydrogenation, the current general method is to pretreat the resin, and use adsorption to remove part of the sulfur and chlorine impurities in the resin, but the removal effect is poor, and then carry out two stages Hydrogenation, the first stage of hydrogenation is used to further remove impurities such as sulfur and chlorine on the basis of pretreatment, but if the chlorine content is too high, it will cause catalyst poisoning and quickly deactivate its desulfurization ability. In addition, after a stage of hydrogenation To obtain the resin liquid, harmful gases such as hydrogen sulfide and hydrogen chloride in the hydrogenation product must be separated by high and low fractions before entering the second-stage main hydrogenation reactor. Not only the process is cumbersome, but also the energy consumption is increased.

Images