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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 not being able to simultaneously adsorb volatile organic compounds in sulfur-containing gases, and cannot achieve deep desulfurization and desulfurization efficiency Low-level problems, to achieve the effect of improving the removal rate, increasing the contact area, and improving the adsorption efficiency

Active Publication Date: 2021-04-16
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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  • Sulfur-containing gas purification process

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preparation example Construction

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

[0040] (1) Prepare respectively a dimethylimidazole aqueous solution A with a concentration of 0.3-0.6M and a soluble cobalt salt aqueous solution B with a concentration of 40-60mM;

[0041] (2) Mix dimethylimidazole aqueous solution A and soluble cobalt salt aqueous solution B to obtain solution C, immerse the molecular sieve in the solution C for 0.5-4 hours, take it out, wash and dry to obtain the precursor of MOF in situ modification D;

[0042] (3) Precursor D is heat-treated at 400-600°C, the MOF is converted into the corresponding cobalt oxide, and a modified molecular sieve modified in situ by the cobalt oxide is obtained;

[0043] The molecular sieves used include one or more of 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. , pick...

Embodiment 1

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

[0047] (1) preparing the dimethylimidazole aqueous solution A with a concentration of 0.3M and the soluble cobalt salt aqueous solution B with a concentration of 40mM;

[0048] (2) Mix dimethylimidazole aqueous solution A and soluble cobalt salt aqueous solution B to obtain solution C, immerse the molecular sieve in the solution C for 0.5, take it out, wash and dry to obtain the precursor D of MOF in situ modification;

[0049] (3) Precursor D is heat-treated at 400°C, the MOF is converted into the corresponding cobalt oxide, and a modified molecular sieve modified in situ by the cobalt oxide is obtained;

[0050] The sulfur-containing gas used is blast furnace gas, and the regeneration gas is heated to 140-270°C during the desorption process, and the desorption time is 4 hours.

Embodiment 2 to Embodiment 20

[0052] Except for parameter changes, the preparation process and desorption process of the modified molecular sieve are consistent with Example 1, and the specific materials, parameters and results are shown in Table 1.

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Abstract

The invention provides a sulfur-containing gas purification process, and belongs to the field of gas purification. Sulfur-containing gas is introduced into a purification unit, sulfide in blast furnace gas is adsorbed, converted and removed through an adsorbent in the purification unit to obtain clean product gas, when the adsorbent is fully adsorbed, part of the clean product gas is introduced into the purification unit to regenerate the adsorbent; at the moment, a purification system enters a thermal desorption state, and the generated desorbed gas can be recycled after being purified. The purification unit is composed of a plurality of adsorption towers arranged in parallel, and purification and desorption working modes are switched among the adsorption towers in turn. The adsorbent filled in the adsorption tower is a modified molecular sieve of which the surface is in-situ modified by a metal oxide, and the metal oxide is obtained by carrying out heat treatment on a metal organic framework precursor and has a nano-sized three-dimensional shape and a relatively large specific surface area. By using the process, the selective adsorption, conversion and removal efficiency of the molecular sieve adsorbent on sulfide can be effectively improved, and the total sulfur content of the purified clean blast furnace gas is less than 0.1 mg / Nm3.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a sulfur-containing gas purification process. Background technique [0002] Sulfur-containing gases (such as H 2 S, CS 2 , COS, mercaptan, sulfide, thiophene, etc.) mainly come from industries such as metallurgy, chemical industry, oil refining, mining, waste incineration, boilers, and automobiles. The direct discharge of sulfur-containing gases without desulfurization treatment will damage human health and damage Environmental protection, and the direct use of valuable sulfur-containing gas will seriously corrode production equipment. [0003] Taking blast furnace gas as an example, blast furnace gas is a by-product gas in the steelmaking process, and there are about 1300-1600m3 gas for every ton of steel produced. 3 Produced by blast furnace gas, blast furnace gas contains about 23% CO, which can be used to synthesize methanol, ethylene glycol and other products. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(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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