Preparation method of nickel-based hydrogenation catalyst

Abstract

The invention discloses a preparation method of a nickel-based hydrogenation catalyst. The preparation method comprises the following steps that carrier alumina and / or silicon oxide, an active metal ingredient and an auxiliary agent ingredient are prepared into slurry; the slurry and a precipitator are added into a reactor in a parallel flow way and are prepared into a catalyst precursor; and the catalyst precursor, a peptizing agent and water are mixed, kneaded, molded, dried and calcined to form the nickel-based hydrogenation catalyst. Through the preparation method, the active metal ingredient can uniformly precipitate on the carrier so that high-uniformity uniformity of the active metal ingredient on the carrier is guaranteed. Through the parallel flow way for precipitation, a uniform precipitation environment in precipitation is obtained so precipitates having the same shape and size are obtained. The nickel-based hydrogenation catalyst obtained by the preparation method can be utilized for hydrogenation decoloration of C5 petroleum resin, C9 petroleum resin and C5-C9 mixed petroleum resin.

Description

technical field [0001] The present invention relates to a kind of preparation method of nickel-based hydrogenation catalyst, particularly for C 5 Petroleum resin, C 9 Petroleum resin and C 5 、C 9 Blended petroleum resin hydrodecolorization catalyst. Background technique [0002] Petroleum resin is a functional resin with a relatively low molecular weight, which has the characteristics of thickening, cohesiveness and compatibility with other resins. Widely used in coatings, adhesives, printing inks, rubber additives, paper additives and other fields. Petroleum resin can be divided into C and C according to different raw materials and properties. 5 Petroleum resin, C 9 Petroleum resin, C 5 -C 9 Copolymerized petroleum tree, etc. At present, the main source of preparing petroleum resin is the by-product of petroleum cracking ethylene. Due to the difference of cracking raw material and cracking depth, the output of this by-product is generally 10% to 20% of ethylene pro...

AI Technical Summary

Problems solved by technology

Although noble metal catalysts have strong olefin and aromatic hydrocarbon saturation capabilities and achieve ideal results in the hydrogenation and decolorization of petroleum resins, noble metal catalysts have the following disadvantages: first, the preparation cost of noble metal catalysts is much higher than that of non-precious metal catalysts; secondly, During the use of noble metal catalysts, the requirements for the content of impurities in the raw materials, especially the requirements for the content of sulfur in the raw materials are particularly stringent

The disadvantages of the preparation of the catalyst are: firstly, during the precipitation process, the acidic nickel salt solution is added to the alkaline precipitant solution, so that the precipitation environment in the reaction kettle is different at the moment of the precipitation process, that is, the precipitation reaction is in the reaction kettle. The pH value of the pH value changes from large to small, resulting in different sizes of precipitated grains, affecting the activity level of nickel and reducing the activity of the catalyst; It belongs to the mixing of two solid substances, which is not conducive to the dispersion of nickel precipitates on the surface of the carrier and reduces the utilization rate of active metals

The disadvantage of this method is that the precipitation temperature is high, and the ammonia released during the precipitation process also causes environmental pollution.

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