Method for preparing and using cracking catalyst for oil production by lightening coal-tar pitch

Abstract

Preparation and application of a coaltar pitch oil preparation cracking catalyst, relate to a cracking catalyst for coaltar pitch oil preparation, which is characterized by the following: immerging 100 portion zeolite into 100 portion metal nitrate aqueous solution with the concentration of 2.8 wt%-24.2 wt% for 2 hours at the temperature of 80 DEG C; standing after dipping, and then obtaining supernatant fluid; drying the supernatant fluid for 4 hours at 120 DEG C, and then activating for 5 hours at 500 DEG C. to get the cracking catalyst which metal oxide content is 1.2 wt%-20.0 wt% of the weight of the zeolite. While in use, the catalyst is filled into a third stage fixed-bed reactor for coaltar pitch oil preparation to ensure the pitch which has already been hydrogenation modified and refined in a second stage fixed-bed reactor to perform catalytic cracking reaction, under the conditions of 400-450 DEG C, 1.0-5.0 bar, hydrogen-oil ratio of 900 / 1-1500 / 1 and catalytic reaction space-velocity WHSV of 0.5-2.0 h<-1>, wherein, the total oil yield of fuel can reach 75%. The invention with flexible operation condition and low operating cost is applicable for preparing oil by catalytic cracking various coaltar pitch.

Description

technical field [0001] The invention relates to a preparation and application method of a coal tar pitch lightening oil production catalyst, in particular to a preparation method and a use method of a cracking catalyst for coal tar pitch hydrogenation and cracking upgrading oil production. Background technique [0002] In the processing and utilization of coal tar, coal tar is usually firstly fractionated into light and heavy fractions, that is, it is divided into several narrow fractions such as light oil, phenol oil, naphthalene oil, washing oil, anthracene oil and so on by distillation. tar pitch. Then, hydrofining or upgrading from different narrow fractions is used to produce phenol, naphthalene, anthracene and other chemical products through separation and extraction, and the remaining part of the processing and extraction is often mixed into fuel oil for use. In the past, the processing of coal tar was mainly concentrated in the production of chemical products. Howe...

AI Technical Summary

Problems solved by technology

The catalyst of the present invention solves the problems of low oil yield and easy coking and deactivation of the catalyst existing in the hydrogenation of coal tar pitch for the cracking and lightening of coal tar pitch