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A sulfur-containing gas purification process

A gas purification and process technology, applied in the direction of combustible gas purification, combustible gas purification/transformation, catalytic conversion of impurities, gas purification, etc., can solve the problem of inability to simultaneously adsorb volatile organic compounds in sulfur-containing gases, inability to achieve deep desulfurization, and specific surface area Small and other problems, to achieve the effect of increased removal rate, increased contact area, and larger specific surface area

Active Publication Date: 2022-06-07
NINGBO JINYUANDONG PETROCHEM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sulfur-containing gas purification process to solve the problem of low desulfurization efficiency and inability to achieve deep desulfurization due to the shortcomings of the adsorbent used in dry desulfurization in the existing sulfur-containing gas desulfurization technology, such as small specific surface area and small adsorption capacity. Desulfurization, and the adsorbents in the prior art cannot simultaneously adsorb volatile organic compounds in sulfur-containing gases

Method used

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  • A sulfur-containing gas purification process
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  • A sulfur-containing gas purification process

Examples

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preparation example Construction

[0039] The preparation process of the modified molecular sieve filled in the adsorption tower of the present invention is:

[0040] (1) Prepare an aqueous solution A of dimethylimidazolium with a concentration of 0.3 to 0.6 M and a soluble cobalt saline solution B with a concentration of 40 to 60 mM, respectively;

[0041](2) The dimethylimidazolium aqueous solution A and the soluble cobalt saline solution B were mixed to give solution C, the molecular sieve was submerged in the solution C for 0.5 to 4h and then removed, washed and dried to obtain THE MOF in situ modified precursor D;

[0042] (3) The precursor D is heat treated at 400~600 °C, and MOF is converted into corresponding cobalt oxides, and the modified molecular sieve of cobalt oxide is modified in situ;

[0043] The molecular sieves used include sapo-type molecular sieves, ZSM-type molecular sieves, A-type molecular sieves, Y-type molecular sieves, X-type molecular sieves and ALPO-type molecular sieves in one or more,...

Embodiment 1

[0046] The preparation process of the modified molecular sieve is:

[0047] (1) Prepare aqueous solution A of dimethylimidazolium with a concentration of 0.3 M and a soluble aqueous solution of cobalt saline with a concentration of 40 mM, respectively;

[0048] (2) The dimethylimidazolium aqueous solution A and the soluble cobalt saline aqueous solution B were mixed to give solution C, the molecular sieve was submerged in the solution C 0.5 after removal, washed, dried to obtain MOF in situ modified precursor D;

[0049] (3) The precursor D is heat treated at 400 °C, and the MOF is converted into the corresponding cobalt oxide, and the modified molecular sieve with in situ modification of cobalt oxide is obtained;

[0050]The sulfur-containing gas used is blast furnace gas, and the desorption process heats the regenerative gas to 140-270 ° C, and the desorption time is 4h.

Embodiment 2 to Embodiment 20

[0052] In addition to the parameter changes, the preparation process and desorption process of the modified molecular sieve is consistent with Example 1, the specific material, parameters and results are shown in Table 1.

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Abstract

The invention provides a sulfur-containing gas purification process, which belongs to the field of gas purification. The sulfur-containing gas is passed into the purification unit, and the sulfide in the blast furnace gas is adsorbed and transformed by the adsorbent in the purification unit to obtain a clean product gas. When the adsorbent is fully adsorbed, part of the clean product gas is passed into the purification unit to adsorb At this time, the purification system enters the thermal desorption state, and the generated desorption gas can be reused after purification. The purification unit is composed of multiple adsorption towers arranged in parallel, and the purification and desorption desorption working modes are switched between the adsorption towers in turn. The adsorbent filled in the adsorption tower is a modified molecular sieve whose surface is in-situ modified by a metal oxide. The metal oxide is obtained from a metal-organic framework precursor through heat treatment, and has a nano-sized three-dimensional shape and a large specific surface area. The use of this process can effectively improve the selective adsorption, transformation and removal efficiency of molecular sieve adsorbents on sulfides, and the total sulfur content of the purified blast furnace gas is less than 0.1mg / Nm 3 .

Description

Technical field [0001] The present invention relates to the field of gas purification, specifically to a sulfur-containing gas purification process. Background [0002] Sulfur-containing gases (e.g., H 2 S、CS 2 COS, thiols, thioethers, thiophenes, etc.) mainly from metallurgy, chemicals, oil refining, mining, waste incineration, boilers and automobiles and other industries, the direct emission of sulfur-containing gases without desulfurization treatment will damage human health and break the ecological environment, and the direct use of sulfur-containing gases with use value will seriously corrode production equipment. [0003] Taking blast furnace gas as an example, blast furnace gas is a gas that is a by-product of the steelmaking process, and each ton of steel produced is about 1300 to 1600m 3 Blast furnace gas is produced, which contains about 23% CO and can be used to synthesize methanol, ethylene glycol and other products. At present, domestic and foreign steel companies ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01D53/86B01D53/48C10K1/32C10K1/34B01J20/22B01J20/28B01J20/34B01J20/30
CPCY02P20/129
Inventor 赵传军雷婧郭利鑫邢加博项裕桥何相君
Owner NINGBO JINYUANDONG PETROCHEM ENG TECH
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