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Catalyst for hydrolyzing carbonyl sulfide under low temperature condition and preparation method thereof

A catalyst and carbonyl sulfide technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high applicable temperature, poor catalyst activity at low temperature, and low application range of COS removal concentration, and achieve high Effect of specific surface area and uniform distribution of active components

Inactive Publication Date: 2012-12-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the shortcomings of catalysts such as poor low-temperature activity, high application temperature, and low application range of COS removal concentration, the invention provides a catalyst for hydrolyzing carbonyl sulfide at low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A, get 59.4g zinc nitrate hexahydrate and 37.5g aluminum nitrate nonahydrate, make the mol ratio of Zn and Al be 2: 1, be dissolved in 0.3L distilled water completely, be mixed with mixed salt solution, make Zn and Al in the solution The total ion concentration is 1mol / L;

[0033] B. Dissolve 18g of sodium hydroxide and 95.4g of sodium carbonate in 0.9L of distilled water in turn to prepare a mixed solution, in which OH - and CO 3 2- The concentrations are 0.5mol / L and 1mol / L respectively;

[0034] C. Under the condition of stirring at room temperature, drop all the solution obtained in step A into the solution obtained in step B at a rate of 3 drops / second, then add 0.5mol / L hydrochloric acid dropwise to adjust the pH value to make the pH value 9, and finally continue Stir for 45 minutes to obtain a suspension;

[0035] D. Aging the suspension obtained in step C for 8 hours at 70°C, and precipitation occurred;

[0036] E. Filter the product obtained in step D, and...

Embodiment 2

[0039] A, get 24.2g zinc sulfate and 20.3g aluminum chloride, make the molar ratio of Zn and Al be 1: 1, and dissolve completely in 0.6L distilled water, be mixed with mixed salt solution, make the ion total of Zn and Al in the solution The concentration is 0.5mol / L;

[0040] B. Dissolve 84g of ammonia water and 993.6g of potassium carbonate in 2.4L of distilled water in turn to prepare a mixed solution, in which OH - and CO 3 2- The concentrations are 1mol / L and 3mol / L respectively;

[0041] C. Under the condition of stirring at room temperature, drop all the solution obtained in step A into the solution obtained in step B at a rate of 1 drop / second, then add 1.5mol / L hydrochloric acid dropwise to adjust the pH value to make the pH value 10, and finally continue Stir for 60 minutes to obtain a suspension;

[0042] D. Aging the suspension obtained in step C for 10 hours at 50°C, and precipitation occurred;

[0043] E. Filter the product obtained in step D, and wash the fi...

Embodiment 3

[0046] A, get 20.4g zinc chloride and 17.1g aluminum sulfate, make the molar ratio of Zn and Al be 1.5: 1, and dissolve completely in 0.125L distilled water, be mixed with mixed salt solution, make the ion total of Zn and Al in the solution The concentration is 2mol / L;

[0047] B. Dissolve 84g potassium hydroxide and 26.5g sodium carbonate in 0.5L distilled water successively to prepare a mixed solution, in which OH - and CO 3 2- The concentrations are 3mol / L and 0.5mol / L respectively;

[0048] C. Under the condition of stirring at room temperature, drop all the solution obtained in step A into the solution obtained in step B at a rate of 2 drops / second, then add 3 mol / L hydrochloric acid dropwise to adjust the pH value to make the pH value 9, and finally continue stirring 30 minutes to get the suspension;

[0049] D. Aging the suspension obtained in step C for 12 hours at 60°C, and precipitation occurred;

[0050] E. Filter the product obtained in step D, and wash the fi...

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PUM

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Abstract

The invention provides a catalyst for hydrolyzing carbonyl sulfide under a low temperature condition and a preparation method thereof. The catalyst for hydrolyzing carbonyl sulfide under the low temperature condition is prepared from the following components in percentage by weight: 60-80 percent of ZnO and 20-40 percent of Al2O3. The preparation method comprises the following steps of: preparinga mixed salt solution of zinc salt and aluminum salt; preparing a mixed solution of alkali and carbonate; titrating and mixing the two solutions; dropwise adding 0.5-3 mol / L of hydrochloric acid to adjust a pH value and obtain a suspension; aging at 50-70 DEG C for 8-12 h, filtering and drying the obtained filter cake at 60-90 DEG C for 8-12 h; and roasting the filter cake at 400-500 DEG C for 3-5 h, tabletting, screening and taking 40-60 meshes to obtain the catalyst. The obtained catalyst of the invention has the advantages of higher specific surface area, even active constituent distribution, and the like and can remove COS in the gases under the low temperature condition to obtain high COS conversion rate above 90 percent, and H2S generated through hydrolysis is fully removed.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for hydrolyzing carbonyl sulfide at low temperature and a preparation method thereof, belonging to the technical field of chemical industry. Background technique [0002] Carbonyl sulfide (COS) widely exists in raw materials for chemical production with coal, natural gas and petroleum as raw materials. The existence of these sulfides will not only cause environmental pollution, corrode metal pipes and equipment, but also cause poisoning of downstream catalysts, thus Affect the production of subsequent chemical products. Especially in recent years, due to the prominent contradiction between energy supply and demand and the sharp rise in oil prices, some chemical fertilizer plants and alcohol plants often use some low-priced and low-quality high-sulfur coal to produce raw material gas in order to reduce costs, thereby increasing the COS content in raw gas. [0003] During the treatment of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01D53/48B01D53/86
Inventor 易红宏赵顺征唐晓龙宁平王红妍何丹李凯康东娟
Owner KUNMING UNIV OF SCI & TECH