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A pollution-free preparation process of a wide temperature coal-to-natural gas methanation catalyst

A methanation catalyst and coal-to-natural gas technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of waste water and gas discharge

Active Publication Date: 2015-12-09
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can produce sufficiently high activity and sufficient strength wide-temperature coal-to-natural gas methanation catalysts, they all have a common disadvantage: a large amount of waste water or polluted gas emissions

Method used

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  • A pollution-free preparation process of a wide temperature coal-to-natural gas methanation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Take 786g of nickel nitrate and dissolve it in 5400g of deionized water, then add 270g of isopropanol to get the bottom solution;

[0035] 2. Add MgAl to the bottom liquid 2 o 4 142g of porous magnesium aluminate is fully beaten;

[0036] 3. Preheat the slurry to 90°C;

[0037] 4. Add 95g of carbonyl nickel powder;

[0038] 5. Inject air into the hydrogen peroxide storage tank containing 2.0 mol at a rate of 0.5 L / min to obtain air saturated with hydrogen peroxide;

[0039] 6. Pass the above-mentioned air saturated with hydrogen peroxide into the slurry in step 4);

[0040] 7. After the hydrogen peroxide volatilizes, age the reacted slurry at 80°C for 12 hours, and then filter to obtain a filter cake;

[0041] 8. The filter cake is dried at 80°C, crushed, pressed into tablets, and roasted at 550°C to obtain a wide-temperature coal-to-natural gas methanation catalyst;

[0042] 9. The air from step 6) is circulated repeatedly by the fan until the hydrogen peroxid...

Embodiment 2

[0046] 1. Take 2600g nickel nitrate and dissolve it in 5400g deionized water, then add 80g tert-butanol to get the bottom solution;

[0047] 2. Add MgAl to the bottom liquid 2 o 4 142g of porous magnesium aluminate and 142g of CeO 2 Fully beat;

[0048] 3. Preheat the slurry to 60°C;

[0049] 4. Add 122g of sponge nickel powder;

[0050] 5. Pass air into the hydrogen peroxide storage tank containing 2.5 mol at a rate of 1.5 L / min to obtain air saturated with hydrogen peroxide;

[0051] 6. Pass the above-mentioned air saturated with hydrogen peroxide into the slurry in step 4);

[0052] 7. After the hydrogen peroxide volatilizes, age the reacted slurry at 60°C for 12 hours, and then filter to obtain a filter cake;

[0053] 8. The filter cake is dried at 200°C, crushed, pressed into tablets, and roasted at 800°C to obtain a wide-temperature coal-to-natural gas methanation catalyst;

[0054] 9. The air from step 6) is circulated repeatedly by the fan until the hydrogen per...

Embodiment 3

[0058] 1. Take 1571g of nickel nitrate and dissolve it in 5400g of deionized water, then add 108g of neopentyl alcohol to get the bottom solution;

[0059] 2. Add 213g of La to the above bottom liquid 2 o 3 Fully beat;

[0060]3. Preheat the slurry to 100°C;

[0061] 4. Add 142g of sponge nickel powder;

[0062] 5. Pass air into the hydrogen peroxide storage tank containing 3.0 mol at a rate of 1.5 L / min to obtain air saturated with hydrogen peroxide;

[0063] 6. Pass the above-mentioned air saturated with hydrogen peroxide into the slurry in step 4);

[0064] 7. After the hydrogen peroxide volatilizes, age the reacted slurry at 100°C for 1 hour, and then filter to obtain a filter cake;

[0065] 8. The filter cake is dried at 120°C, crushed, pressed into tablets, and roasted at 600°C to obtain a wide-temperature coal-to-natural gas methanation catalyst;

[0066] 9. The air from step 6) is circulated repeatedly by the fan until the hydrogen peroxide content is less than 1...

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Abstract

The invention provides a pollution-free preparation process for a wide-temperature coal-based natural gas methanation catalyst. The process sequentially comprises the following preparation steps: dissolving branched chain alcohol in an aqueous solution of nickel nitrate to serve as a base solution; pulping the obtained base solution and porous magnesium aluminate and / or rare earth oxide to prepare slurry; preheating the slurry; introducing air into a hydrogen-peroxide-containing storage tank, so as to obtain air saturated by the hydrogen peroxide; introducing the air saturated by the hydrogen peroxide into the preheated slurry; ageing the reacted slurry after the hydrogen peroxide is completely volatilized, and filtering to obtain a filter cake; drying, crushing and molding the filter cake, roasting at the temperature of 550-800 DEG C to obtain the catalyst; and repeatedly circulating the air out of the hydrogen-peroxide-containing storage tank until the content of hydrogen peroxide is less than 1.0g / m<3>, absorbing the air by using the base solution and emitting after the standard is reached. The filtrate and the absorption liquid are merged, the concentration of the branched chain alcohol and nickel nitrate is regulated back, the branched chain alcohol and nickel nitrate are returned for recycling, and emission of the three wastes is avoided in the whole process. The catalyst prepared by the process is high in activity and high in strength, and the requirement of the coal-based natural gas methanation process is met.

Description

technical field [0001] The invention belongs to the field of catalysts for coal-based energy products, and more specifically relates to a pollution-free preparation process for wide-temperature coal-based natural gas methanation catalysts. Background technique [0002] Coal-to-natural gas means that coal is gasified to produce syngas, and then purified, and the final methanation synthesis calorific value > 8000kCal / Nm 3 substitute natural gas. Compared with coal-based energy product technologies such as coal-to-oil, coal-to-olefin, coal-to-dimethyl ether, and coal-to-ethylene glycol, coal-to-natural gas has the following obvious competitive advantages: 1) mature technology; 2) high energy efficiency, It is the coal-based energy product with the highest energy efficiency; 3) water saving; 4) convenient transportation; 5) environmental protection; in addition, the development of coal-based natural gas can also reduce the dependence on imported natural gas and effectively g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/83C10L3/08
Inventor 李小定章小林吕小婉李耀会张雄斌李新怀李伦张艺馨
Owner HAISO TECH
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