Method for replacing primary hydrogenation catalyst in device for preparing methanol by coke oven gas

Abstract

The invention discloses a method for replacing primary hydrogenation catalyst in device for preparing methanol by coke oven gas. The method comprises the following steps: (1) sequentially shutting down each filter, and replacing filling with a wood activated carbon oil absorbent; (2) shutting down a prehydrogenation tank, and replacing prehydrogenation catalyst in the prehydrogenation tank; (3) shutting down the first medium-temperature zinc oxide tank behind the primary hydrogenation tank, and replacing the filled catalyst with a ferrimanganic desulfurization catalyst; (4) shutting down the second medium-temperature zinc oxide behind the primary hydrogenation tank, and reloading the upper layer with an iron-molybdenum hydrogenation catalyst; and (5) shutting down the primary hydrogenation tank, replacing a primary hydrogenation catalyst, combining into the system and performing online vulcanization. According to the method, the conversion rate of organic sulfur can be ensured by replacing the catalyst to achieve the effect of temporarily replacing primary hydrogenation, so that the content of exit sulfur of fine desufurization is lower than 0.1PPM, and the primary hydrogenation catalyst can be replaced without production shut-down.

Description

technical field [0001] The invention relates to a refined desulfurization process suitable for coke oven gas to methanol production in coal chemical enterprises, in particular to a method for replacing a primary hydrogenation catalyst in a coke oven gas to methanol device. Background technique [0002] Coal chemical enterprises use coke oven gas as raw material to produce methanol through desulfurization, transformation, synthesis, rectification and other processes. figure 1 As shown, in the fine desulfurization section, the coke oven gas from the coke oven gas compression section passes through the oil separator, filter A and filter B to remove tar, and then passes through the pre-desulfurization tank to remove part of the sulfide, and then goes to the conversion section The coke oven gas primary preheater is preheated. figure 2 As shown, the preheated coke oven gas is returned to the pre-hydrogenation tank and primary hydrogenation tank of the fine desulfurization unit, ...

AI Technical Summary

Problems solved by technology

However, the traditional one-stage hydrogenation catalyst replacement plan can only be carried out when the device is shut down, otherwise the organic sulfur at the outlet of the fine desulfurization section will exceed the process index, causing irreversible poisoning to the methanol synthesis catalyst

The replacement of the primary hydrogenation catalyst needs to go through six steps: cooling, replacement, loading and unloading, heating, vulcanization, sulfur release, and integration into the system. In addition to the start-up and shutdown time of the device, it takes at least 10 days to replace the primary hydrogenation catalyst. Deficiencies such as excessive shutdown time, lower device operating rate, and impact on methanol production

Images