Oxygen enrichment coal tar hydro-conversion method

Abstract

The invention relates to a hydrogenizating conversing method of oxygen enriched coal oil. Oxygen enriched coal oil is separated as oxygen enriched distillation and deoxidating distillation in a distillating unit, deoxidating distillation finished hydrogenizating reaction in a hydrogenizating unit to obtain a hydrogen enriched gas phase product and a liquid oil phase product composed by conventional liquid hydrocarbon. For hydrogenizating conversing process of oxygen enriched coal oil, the invention can reduce invest and prolong operation cycle.

Description

technical field [0001] The invention relates to a hydrogenation conversion method of oxygen-enriched coal tar. Background technique [0002] Patent CN 1676583A is a two-stage medium-high temperature coal tar hydrocracking process, which relates to an oxygen-enriched coal tar hydrogenation conversion method. According to its embodiment, the oxygen content of the raw material reaches ~ 8.1% (to the weight of the raw material), and the density of the raw material at 20°C is 1.0426g / cm 3 , The raw material boiling range is 128 (initial boiling point) ~ 455 ° C (80% distillation point). The first stage is hydrofining, the reaction conditions are: cascade gradation of protective agent and refining agent, catalyst volume space velocity is 1.0hr -1 / 0.8hr -1 , the temperature is 240°C / 370°C, the pressure is 128MPa, the volume ratio of hydrogen / raw oil is 1200:1, the amount of water produced is 9.12% (to the weight of raw material), and the density of refined oil is 0.885g / cm 3 ....

AI Technical Summary

Problems solved by technology

At the same time, in the patent CN 1676583A, the generated oil of the two stages shares a fractionating tower, and the gasoline and diesel components of different qualities in the first stage and the two stages cannot be separated

[0003] The method of patent CN 1676583A does not make rational use of the oxygen-containing compounds in the raw materials (mostly phenols), but as hydrogenation raw materials, which intensifies the thermal condensation of hydrogenation raw materials; phenols enter the hydrogenation process at the cost of hydrogen consumption, Converted to water and hydrocarbons, the hydrogenation conversion process of phenols is a devaluation process; at the same time, due to the high organic oxygen content of the raw material and the high water content of the product, an excessive hydrogen / raw oil volume ratio is forced to be used in order to reduce the water pressure in the hydrogenation process , and the refining and cracking process is not suitable (or even impossible) to adopt a series process (causing hydrothermal deactivation effect on the cracking catalyst, and the catalyst life is obviously shortened), thus greatly increasing the project investment