Crude benzene hydrotreating catalyst and preparation method thereof

A technology for hydrorefining and catalysts, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. The problems of complex composition and reduced benzene recovery rate can achieve the effect of enhancing anti-poisoning performance, improving the use of a smaller temperature range and improving the recovery rate.

CN104226325BActive Publication Date: 2016-06-08PINGXIANG PANGTAI IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-06-08

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Abstract

The invention discloses a crude benzene hydrogenation refining catalyst and a preparation method thereof. The catalyst is composed of a pre-hydrogenation catalyst and a main hydrogenation catalyst, wherein the pre-hydrogenation catalyst uses activated alumina as a carrier, and rare earth elements are added to its surface Modified, then impregnated with molybdenum and nickel solution, and activated; the main hydrogenation catalyst uses activated alumina and titanium dioxide as the carrier, adding rare earth elements to modify its surface, and then impregnated with molybdenum and cobalt solution, activated. The invention adds phosphoric acid and rare earth metals to the catalyst, which is beneficial to the dispersion of molybdenum as an active component, so that the specific surface area is larger and more uniform, and the active points are increased. And the addition of rare earth elements enhances the anti-poisoning performance and anti-carbon deposition performance of the catalyst. The addition of titanium dioxide and rare earth materials in the preparation of the catalyst carrier increases the service temperature range of the catalyst, effectively improving the shortcoming of the existing catalyst with a relatively small service temperature range.
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Description

technical field

[0001] The invention relates to the technical field of chemical catalysts, in particular to a crude benzene hydrotreating catalyst and a preparation method thereof. Background technique

[0002] At present, the hydrorefining catalysts used in the market are basically imported, which are expensive and not suitable for large-scale purchase and use.

[0003] However, domestic crude benzene raw materials are relatively complex, and the sources include coking benzene, petroleum benzene, etc., and their sulfur and nitrogen contents are high. The catalysts on the market cannot adapt to the environment of high sulfur and high nitrogen, which often leads to refined products. Unqualified; moreover, this type of catalyst is very sensitive to temperature, the operating temperature is narrow, and the change of temperature often leads to a significant decline in the recovery rate of benzene. Contents of the invention

[0004] Aiming at the above-mentioned shortcomings o...

Examples

Embodiment

[0029] (1) Aluminum oxide, titanium oxide, and rare earth raw materials are screened and classified through vibrating screens to remove large particles;

[0030] (2) After preparing the raw materials according to the formula ratio, adding the alumina and rare earth in the prehydrogenation catalyst to the nitric acid solution with a concentration of 10% to 20% by mass, the alumina and rare earth in the prehydrogenation catalyst are at a mass percent concentration The proportion in the nitric acid solution of 10-20% is 1-500g / ml; the aluminum oxide, titanium oxide and rare earth in the main hydrogenation catalyst are added to the nitric acid solution with a mass percentage concentration of 10-20%, and the main hydrogenation catalyst The ratio of aluminum oxide and rare earth in the nitric acid solution with a concentration of 10-20% by mass is 1-500g / ml; 15 to 20 hours to make its performance stable before use;

[0031] (3) In step (2), the old pre- and main hydrogenation catal...