A deep purification fine desulfurizer and preparation method thereof

Abstract

The invention discloses a deep purification fine desulfuration agent and a preparation method thereof. The deep purification fine desulfuration agent is composed of ZnAl2O4, metal oxide and alkali metal hydroxides or carbonate. The deep purification fine desulfuration agent finished product is prepared from, by weight, 60-90% of ZnAl2O4, 8-30% of metal oxide and 2-15% of alkali metal hydroxides or carbonate. By means of the deep purification fine desulfuration agent, COS and H2S in outlet synthesis gas of a low-temperature methanol washing process can be further removed till the COS content and the H2S content are both smaller than 5 ppb, and catalysts for downstream methanol synthesis, methanation, Fischer-Tropsch synthesis, DMO synthesis and the like are protected.

Description

Technical field: [0001] The present invention relates to the removal of COS and H 2 The technical field of S, especially related to the further removal of COS and H at the outlet of low-temperature methanol washing process in coal-to-oil, coal-to-natural gas (SNG), large-scale coal-to-methanol, coal-to-ethylene glycol and other devices 2 S deep purification fine desulfurizer. Background technique: [0002] At present, there are more than 270 methanol enterprises in China, with a production capacity of more than 50 million tons, accounting for 46.8% of the world's production capacity. It can be seen that the average methanol production capacity of each enterprise is less than 200,000 tons. The sharp rise in methanol prices from 2006 to 2008 led to the launch of a large number of methanol projects. Since 2009, due to the impact of the global financial crisis, methanol prices have been low and production capacity has been extremely overcapacitated. In recent years, the averag...

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Problems solved by technology

[0004] Coal-to-oil, coal-to-natural gas (SNG), large-scale coal-to-methanol, coal-to-ethylene glycol and other devices need to install a guard bed at the outlet of the low-temperature methanol washing process to further remove COS and H at the outlet of the low-temperature methanol washing process. 2 S. At present, some devices directly use ordinary zinc oxide desulfurizer, which can only partially remove H 2 S, COS in the gas source cannot be removed. Some devices use deep hydrolysis catalysts and deep fine desulfurizers to hydrolyze COS into H first. 2 S, and then use deep fine desulfurizer to remove H 2 S removal, deep purification method of synthesis gas is adopted in patent CN200810046867.5. This process needs to be filled with two kinds of catalysts, one for hydrolysis and one for desulfurization. The height and diameter of each catalyst should be considered in equipment design Ratio, resulting in too high overall catalyst height-to-diameter ratio, too large equipment volume, which leads to excessive resistance, and the increase in filling volume will lead to high cost of 6.0-9.0MPa high-pressure equipment. If a conversion absorption type deep purification fine desulfurizer is used , while removing COS and H by hydrolysis 2 S, can reduce the volume of equipment by one-third, thereby reducing equipment manufacturing costs

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