Method for preparing absorbing agent for medium-temperature gas desulfurization

Abstract

The invention discloses a method for preparing an absorbing agent for medium-temperature gas desulfurization. The method comprises that an isometrical ferric nitrate solution is soaked in a Gamma-Al203 carrier isometrically, vacuum impregnation and ultrasonic wave impregnation are performed simultaneously, and the absorbing agent for medium-temperature gas desulfurization with an active componentof ferric oxide is obtained after vacuum drying and high-temperature roasting. During the preparation process of the absorbing agent for medium-temperature gas desulfurization, by the aid of ultrasonic and vacuum synergy effects, the specific surface area of the carrier is improved, the active component is loaded on the carrier uniformly simultaneously, a hole structure of the carrier is improved, component load and drying are completed under ultrasonic and vacuum action, the active component of the prepared absorbing agent is distributed uniformly on the surface of the carrier, the utilization rate of the active component is high, the breakthrough sulfur capacity is large, and the breakthrough time is long.

Description

technical field

[0001] The invention belongs to the technical field of coal gas desulfurization and purification, and relates to a preparation method of a coal gas desulfurization adsorbent, in particular to a preparation method of a medium-temperature coal gas desulfurization adsorbent. Background technique

[0002] my country's coal reserves are relatively abundant. In the foreseeable future, coal will still be the main energy resource for the sustainable development of my country's economy. Coal-based polygeneration technology with coal gasification as the source and integrated coal gasification cycle power generation technology are currently recognized as two high-efficiency coal conversion methods, which are of great significance to my country's energy security and environmental protection. New coal conversion technology, in addition to pursuing high efficiency of coal utilization, pays more attention to the issue of pollutant emissions caused by coal utilization. [0...

Examples

Embodiment 1

[0023] Commercially available γ-Al 2 o 3 Dry at 200°C for 2 to 4 hours, cool down in a desiccator to prepare γ-Al 2 o 3 carrier.

[0024] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 0.79mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 5.0%). Immerse at room temperature and -0.06MPa vacuum for 4 hours at equal volume, then at room temperature and at normal pressure, immerse at equal volume for 4 hours with ultrasonic power of 150W.

[0025] After drying at 70°C and -0.10MPa vacuum for 11h, put it in a muffle furnace, keep it at 700°C for 2h, and cool it down to room temperature naturally to obtain the adsorbent I for desulfurization.

[0026] The desulfurization performance of the adsorbent was evaluated at 500°C, the breakthrough time was 4.8h, and the sulfur capacity was 2.9g / 100g adsorbent.

Embodiment 2

[0028] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 1.57mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 10.0%). Firstly impregnate at room temperature and -0.09MPa vacuum with equal volume for 7 hours, and then at room temperature and normal pressure with ultrasonic power of 350W, impregnate with equal volume for 1 hour.

[0029] After drying at 60°C and -0.09MPa vacuum for 14h, put it in a muffle furnace, keep it warm at 600°C for 2.5h, and cool down to room temperature naturally to obtain the adsorbent II for desulfurization.

[0030] The desulfurization performance of the adsorbent was evaluated at 450, 500 and 550°C respectively, the breakthrough time was 10.3, 11.8 and 11.2h, and the sulfur capacity was 5.1, 6.9 and 6.2g / 100g adsorbent.

Embodiment 3

[0032] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 2.35mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 15.0%). Immerse at room temperature and -0.07MPa vacuum for 6 hours at equal volume, then at room temperature and at normal pressure, immerse at equal volume for 2 hours with ultrasonic power of 250W.

[0033] After drying at 50°C and -0.09MPa vacuum for 12h, put it in a muffle furnace, keep it at 600°C for 2h, and cool it down to room temperature naturally to obtain the adsorbent III for desulfurization.

[0034] The desulfurization performance of the adsorbent was evaluated at 500°C, the breakthrough time was 13.9h, and the sulfur capacity was 8.7g / 100g adsorbent.

technical field

[0001] The invention belongs to the technical field of coal gas desulfurization and purification, and relates to a preparation method of a coal gas desulfurization adsorbent, in particular to a preparation method of a medium-temperature coal gas desulfurization adsorbent. Background technique

[0002] my country's coal reserves are relatively abundant. In the foreseeable future, coal will still be the main energy resource for the sustainable development of my country's economy. Coal-based polygeneration technology with coal gasification as the source and integrated coal gasification cycle power generation technology are currently recognized as two high-efficiency coal conversion methods, which are of great significance to my country's energy security and environmental protection. New coal conversion technology, in addition to pursuing high efficiency of coal utilization, pays more attention to the issue of pollutant emissions caused by coal utilization. [0...

Examples

Embodiment 1

[0023] Commercially available γ-Al 2 o 3 Dry at 200°C for 2 to 4 hours, cool down in a desiccator to prepare γ-Al 2 o 3 carrier.

[0024] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 0.79mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 5.0%). Immerse at room temperature and -0.06MPa vacuum for 4 hours at equal volume, then at room temperature and at normal pressure, immerse at equal volume for 4 hours with ultrasonic power of 150W.

[0025] After drying at 70°C and -0.10MPa vacuum for 11h, put it in a muffle furnace, keep it at 700°C for 2h, and cool it down to room temperature naturally to obtain the adsorbent I for desulfurization.

[0026] The desulfurization performance of the adsorbent was evaluated at 500°C, the breakthrough time was 4.8h, and the sulfur capacity was 2.9g / 100g adsorbent.

Embodiment 2

[0028] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 1.57mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 10.0%). Firstly impregnate at room temperature and -0.09MPa vacuum with equal volume for 7 hours, and then at room temperature and normal pressure with ultrasonic power of 350W, impregnate with equal volume for 1 hour.

[0029] After drying at 60°C and -0.09MPa vacuum for 14h, put it in a muffle furnace, keep it warm at 600°C for 2.5h, and cool down to room temperature naturally to obtain the adsorbent II for desulfurization.

[0030] The desulfurization performance of the adsorbent was evaluated at 450, 500 and 550°C respectively, the breakthrough time was 10.3, 11.8 and 11.2h, and the sulfur capacity was 5.1, 6.9 and 6.2g / 100g adsorbent.

Embodiment 3

[0032] γ-Al with a particle size of 2-3mm 2 o 3 50g of the carrier was placed in a beaker and mixed with 40.00ml of a pre-prepared solution of 2.35mol / L ferric nitrate (theoretical value of the mass percentage of iron oxide in the adsorbent was 15.0%). Immerse at room temperature and -0.07MPa vacuum for 6 hours at equal volume, then at room temperature and at normal pressure, immerse at equal volume for 2 hours with ultrasonic power of 250W.

[0033] After drying at 50°C and -0.09MPa vacuum for 12h, put it in a muffle furnace, keep it at 600°C for 2h, and cool it down to room temperature naturally to obtain the adsorbent III for desulfurization.

[0034] The desulfurization performance of the adsorbent was evaluated at 500°C, the breakthrough time was 13.9h, and the sulfur capacity was 8.7g / 100g adsorbent.

Images