Method for replacing primary hydrogenation catalyst in coke oven gas to methanol unit

Abstract

The invention discloses a method for replacing a primary hydrogenation catalyst in a coke oven gas methanol production device, which adopts the following method steps: (1) stop each filter in sequence and replace the filler with a wood activated carbon oil absorbent; ( 2) Stop the pre-hydrogenation tank and replace the pre-hydrogenation catalyst in it; (3) Stop the first medium-temperature zinc oxide tank after the first-level hydrogenation tank, and replace the catalyst filled with iron-manganese desulfurization catalyst; (4 ) Stop the second medium-temperature zinc oxide tank after the first-level hydrogenation tank, and replace the upper layer with an iron-molybdenum hydrogenation catalyst; (5) Shut down the first-level hydrogenation tank, and integrate the first-level hydrogenation catalyst into the system Perform in-line vulcanization. This method ensures the conversion rate of organic sulfur by replacing the catalyst, and temporarily replaces the function of primary hydrogenation, so that the sulfur content of the refined desulfurization outlet is lower than 0.1PPM, so that the primary hydrogenation catalyst can be replaced without stopping production.

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

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