Prepn. of titanium-containing aluminium hydroxide

Abstract

The preparation method of aluminium hydroxide containing titanium is characterized by adding cheap titanium-contained compound in the course of preparing aluminium hydroxide. Said preparation process is simple, low in cost, at the same time the titanium oxide can be uniformly dispersed on the surface of aluminium oxide, so that the influence of the preparation process to aluminium oxide microstructure can be eliminated. Said aluminium hydroxide possesses good peptization property, when it is used for preparing catalyst carrier or catalyst, it can make catalyst easily form and can reduce its cost, and when it is used to prepare catalyst carrier and hydrogenation catalyst, it possesses good physical and chemical properties and application property.

Description

technical field [0001] The present invention relates to a method for preparing titanium-containing aluminum hydroxide, in particular to a method for adding a low-cost titanium-containing compound in the process of carbonization to prepare aluminum hydroxide and still maintaining the characteristics of carbonization aluminum hydroxide, and A method for preparing titanium-containing aluminum hydroxide that uniformly distributes titanium oxide on the surface of the aluminum hydroxide. Background technique [0002] Generally, the hydrotreating catalysts for hydrocarbon feeds are all based on γ~Al 2 o 3 Or γ~Al containing a small amount of one or more other elements such as Si, P, Ti, B, Mg, F, etc. 2 o 3 as the carrier. During the catalyst preparation process, the above-mentioned elements can be introduced into the system at different stages, but the purpose of introducing the above-mentioned elements is basically the same, that is, to adjust the acidity of the catalyst and / ...

AI Technical Summary

Problems solved by technology

However, in some catalyst production processes, such as kneading method and "mixing-dipping" combination method (CN1098433A; US5089453), due to the intervention of active components, the competition between each species and the alumina precursor-aluminum hydroxide interaction is Inevitably, this will weaken the TiO 2 It can promote the performance of the catalyst, so it is necessary to prepare uniformly dispersed titanium-containing aluminum hydroxide

[0003] CN1015638B has announced a kind of carbon dioxide method to prepare the method (carbonization method) of aluminum hydroxide, and this method adopts the method that carbon dioxide is passed into sodium metaaluminate solution to prepare aluminum hydroxide, and preparation process technology is simple, and no pollutant is discharged, and carrier cost is lower low, but this process does not add some additives needed to prepare the catalyst, and the physical and chemical properties of the carrier have not been effectively improved. In order to prepare a catalyst with better performance, it is necessary to prepare a hydrogen oxide containing the required additives. Aluminum carrier

Simply put, the co-precipitation conditions are sometimes not the best precipitation conditions for the two substances at the same time, thus causing the inflexibility of the co-precipitation method, and since the co-precipitation method is the simultaneous precipitation of two substances, the precipitation conditions must be coordinated. Make the two substances reach a certain precipitation speed, and at the same time make the two precipitates achieve certain physical and chemical properties to meet the requirements of use

However, the same precipitation conditions cannot be the best precipitation conditions for two substances at the same time. Especially for alumina, its physical and chemical indicators are often adjusted according to the requirements of use. One of the main adjustment methods is to change the precipitation conditions, while the other It is impossible for a substance to be confined in adapting to the precipitation conditions of the previous substance

And use soluble titanium salt solution, its raw material cost is high, a large amount of acid mist is produced in the preparation process, pollutes the environment, corrodes the equipment