Hydrogenating refining catalyst for petroleum wax stuff and its preparation process

Abstract

The invention discloses a petroleum wax hydrofining catalyst and its preparing method, using Wu, Mo and Ni (or Co) as active metals and using the aluminum oxide containing Si and P auxiliaries to act as a carrier and its preparing method: it dips the aluminum oxide carrier in the Wu-Ni / Co water solution and the Mo-B water solution, respectively, so as to make it. The aluminum oxide carrier is prepared by using the Si-containing aluminum hydroxide prepared by CO2 neutralization process and then adding in the P-containing compound in the forming process. Its preparing process is simple and low-cost. The invention can effectively regulate the physico-chemical property of a catalyst by the cooperative regulation of the two compound auxiliaries, making the catalyst have reasonable aperture structure and proper surface acidic property. This catalyst can process the petroleum waxes including high-melting point petroleum wax and produce food-grade petroleum wax products.

Description

technical field [0001] The invention relates to a hydrorefining catalyst and a preparation method thereof, in particular to a petroleum wax hydrorefining catalyst and a preparation method thereof. Background technique [0002] The purpose of wax hydrorefining is to retain the basic composition of normal alkanes, remove carcinogens such as condensed ring aromatics represented by 3,4-benzopyrene, and non-hydrocarbon sulfur, nitrogen and oxygen. In order for the wax molecules to fully carry out chemical reactions in the active center of the catalyst, the catalyst must have a large specific surface, large pore volume and unimpeded pores to provide an ideal reaction site for the reactants and product molecules. In addition, the paraffin hydrofining process is a highly selective reaction process, which can remove impurities such as sulfur, nitrogen and oxygen in the raw wax and hydrogenate unsaturated components such as condensed ring aromatics. At the same time, this process doe...

AI Technical Summary

Problems solved by technology

When the wet gel is peptized, phosphoric acid is introduced to eliminate the strong acid center of the carrier and reduce the total acid content; the carrier can only be prepared into a spherical carrier through the formation of an oily ammonia column, and the process of forming a ball is complicated. After molding, drying, Low yield due to sieving process, high cost of carrier preparation

Although measures such as vacuum impregnation or reducing the impregnation speed are used when impregnating active metals, the spherical particles are inevitably broken, resulting in low yield and high catalyst cost.