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A method for preparing large-pore sulfur/alumina mercury removal agent

A technology of alumina and mercury removal agent, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of long time, high cost, and difficulty in realization.

Active Publication Date: 2021-07-23
山东迅达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is generally believed that the amount of water and easily condensable hydrocarbons contained in natural gas is not easy to condense in the larger diameter pores of 35nm or more in the mercury removal agent, and the mercury removal agent is prepared by using a carrier with a large pore size and not too low specific surface area. The effect is good; but the main problem of preparing a carrier with a large pore size and a low specific surface area is the high cost, such as steps including pressurized hydrothermal treatment or atmospheric pressure high-temperature steam treatment, which are difficult or time-consuming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare the S / alumina mercury removal agent by the following steps:

[0024] (1) Add fast alumina powder A98kg into the kneader (specific surface area 260m 2 / g, pore volume 0.40ml / g, calculable particle size 10μm, loss on ignition at 500°C 6%), pseudoboehmite dry powder B12kg (-600 mesh, carbonization method, loss on ignition at 500°C 35%) 1. 3kg of tianqing powder, mix well; add 100kg of acid-containing aqueous solution, knead for 1hr to form a uniform mass, the mass is extruded through a Φ2.5mm orifice plate (the size deviation of the plate hole diameter is less than 3%) in the extruder, Extruded strips were dried at 130°C; the acid-containing aqueous solution contained 6kg of pure phosphoric acid and 5kg of ammonium dihydrogen phosphate;

[0025] (2) Take out about 2kg of reserved samples from the dried strips, and roast the rest in the kiln. The temperature in the high temperature section is 1000°C, the time is 2.5hr, and the heating rate in the heating section is...

Embodiment 2

[0033] Basically repeat the method of embodiment 1, prepare S / alumina mercury removal agent:

[0034] (1) Add 100kg of fast-de-alumina powder A, pseudoboehmite dry powder B8kg, and scallop powder 3kg into the kneader, and mix evenly; add 100kg of acid-containing aqueous solution, and knead for 1hr to form a uniform mass, which is extruded The machine extrudes strips through a Φ2.5mm orifice plate, and the extruded strips are dried at 130°C; the acid-containing aqueous solution contains 5kg of pure phosphoric acid and 6kg of ammonium dihydrogen phosphate;

[0035] (2) Take out about 4kg of reserved samples from the dried strips, and roast the rest in the kiln. The temperature in the high temperature section is 1000°C, the time is 2.5hr, and the heating rate in the heating section is about 200°C / hr; the roasted strips are processed by a swing crusher to the length 3-12mm, the alumina carrier is prepared, the average diameter of the carrier is Φ2.0mm, and the specific surface are...

Embodiment 3、4

[0042] Take 1 kg of the dried strip samples from step (2) of Examples 1 and 2 and roast them in a muffle furnace respectively. The heating rate is about 200 °C / hr, and the temperature is kept at 1050 °C for 2.5 hours. After the constant temperature, the power is turned off and the temperature is naturally lowered.

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PUM

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Abstract

The invention provides a method for preparing a sulfur / alumina demercurant, which comprises the following steps: (1) mixing fast alumina powder, pseudoboehmite dry powder and lubricant, adding phosphoric acid and ammonium dihydrogen phosphate Aqueous solution, kneaded into a uniform material block, the material block extruded and dried; (2) The dry bar was roasted at 950‑1050 °C to obtain an alumina carrier with a specific surface area of ​​40‑60 m 2 / g, the pore volume is 0.5-0.6ml / g, and the pore diameter is 40-60nm; (3) Mix the alumina carrier and industrial sulfur, heat to 140-155°C in a closed converter and an inert atmosphere, and heat preservation treatment for 1- 8hr, and then quenched to obtain a mercury removal agent. The mercury removal agent of the invention has low cost, is not easy to drop powder during a long-term application process, and the mercury removal accuracy and capacity are not affected by the moisture and easily condensable hydrocarbons contained in the material flow.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a method for preparing a large-aperture sulfur / alumina mercury removal agent. Background technique [0002] Wellhead natural gas usually contains a small amount of mercury, generally lower than 200μg / m³, and sometimes as high as 1000μg / m³; in the process of recovery of condensate oil, liquefaction and nitrogen separation by low temperature methods, low temperature heat exchangers made of aluminum alloy such as plate-fin type should be installed For heat exchangers, the mercury contained in natural gas will form amalgam on the surface of aluminum alloy, which will cause the dense aluminum oxide film that plays a protective role to fall off, and the water and hydrogen sulfide contained in the natural gas flow will chemically react with the aluminum in the amalgam to accelerate Corrosion, after a long period of time, will cause corrosion and leakage of the heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/64B01D53/81
CPCB01D53/64B01D53/81B01D2257/602
Inventor 崔国栋崔旭浩胡文宾
Owner 山东迅达化工集团有限公司