Method for removing sulfureted hydrogen through fixed bed of catalytic gasoline without liquid alkali

Abstract

This invention relates to a method for removing hydrogen sulfide from catalytically cracked gasoline with alkali and fixed bed. The method comprises: statically mixing catalytically cracked gasoline with protecting agent, reacting catalyst and hydrogen sulfide (contained in gasoline) at normal temperature and normal pressure to obtain sulfur, sulfide and hydrosulfide that are adsorbed on the bed layer, and discharging out of the system through a waste-discharge tank. The protecting agent is used for purifying the bed layer and maintaining the activity of the catalyst. Hydrogen sulfide-removingcolumns I and II are used in series. The atalytically cracked gasoline is introduced into hydrogen sulfide-removing column I from the lower part. After hydrogen sulfide and impurities are adsorbed bycatalyst, the gasoline is then introduced into hydrogen sulfide-removing column II for secondary hydrogen sulfide adsorption. Then the gasoline is introduced into a thioalcohol-removing process. Whenthe sulfur adsorption of hydrogen sulfide-removing column I is saturated, the statically mixed catalytically cracked gasoline is switched to hydrogen sulfide-removing column II (as the primary hydrogen sulfide-removing column). With the hydrogen sulfide-removing columns used in series, the adsorption capacity of the catalyst is used adequately, the hydrogen sulfide-removing effect and efficiencyare improved, the catalyst consumption is reduced, and the cost for removing hydrogen sulfide is reduced.

Description

technical field

[0001] The invention belongs to the technical field of petrochemical industry, in particular to a method for removing hydrogen sulfide from catalytic cracking (FCC) gasoline with a fixed bed aneroid alkali. Background technique

[0002] In the refinery, the catalytic cracking stabilized gasoline produced by heavy oil through catalytic cracking reaction, fractionation and absorption stabilization device contains a small amount of harmful substances such as hydrogen sulfide and mercaptan, and needs to be desulfurized and refined to meet the quality requirements of qualified gasoline. The existing technology is to use 5-15% sodium hydroxide solution for pre-alkali washing to remove a small amount of hydrogen sulfide and some low-molecular mercaptans, and then convert the remaining mercaptans into disulfides by catalytic oxidation, so as to achieve The purpose of refining is to make gasoline water-soluble acid-base qualified, copper sheet corrosion qualified, mer...

Examples

Embodiment 1

[0034] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0035] The method step of removing hydrogen sulfide is:

[0036] a, prepare catalyst: get 0.3Kg sodium hydroxide and pour into reactor, add water 2Kg, after fully dissolving, load on 9.5Kg into granular active carbon, be the prepared catalyst after drying;

[0037] b. Preparation of protective agent: take 0.3Kg of sodium hydroxide, add 0.75Kg of water, add 0.004Kg of dimethylguanidine, and then add 0.004Kg of cobalt phthalocyanine for dissolution;

[0038] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepar...

Embodiment 2

[0045] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0046] The method step of removing hydrogen sulfide is:

[0047] a, prepare catalyst: get 0.5Kg potassium hydroxide and pour into reactor, add water 3Kg, spray on 16.2Kg granular activated carbon after fully dissolving, be catalyst after drying;

[0048] b. Preparation of protective agent: take 0.2Kg potassium hydroxide, add 2.5Kg of water to dissolve, add 0.1Kg trimethylguanidine, and add 0.01Kg sulfonated cobalt phthalocyanine to dissolve;

[0049] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepared cat...

Embodiment 3

[0056] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0057] The method step of removing hydrogen sulfide is:

[0058] a, prepare catalyst: get 0.4Kg sodium bicarbonate and pour into reactor, add water 2.8Kg, after fully dissolving, load on 8Kg granular active carbon, be the catalyst of preparation after drying;

[0059] b. Preparation of protective agent: take 0.25Kg potassium hydroxide, add 1Kg of water, add 0.005Kg tetramethylguanidine, then add 0.005Kg polyphthalocyanine cobalt and dissolve it;

[0060] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepared...

technical field

[0001] The invention belongs to the technical field of petrochemical industry, in particular to a method for removing hydrogen sulfide from catalytic cracking (FCC) gasoline with a fixed bed aneroid alkali. Background technique

[0002] In the refinery, the catalytic cracking stabilized gasoline produced by heavy oil through catalytic cracking reaction, fractionation and absorption stabilization device contains a small amount of harmful substances such as hydrogen sulfide and mercaptan, and needs to be desulfurized and refined to meet the quality requirements of qualified gasoline. The existing technology is to use 5-15% sodium hydroxide solution for pre-alkali washing to remove a small amount of hydrogen sulfide and some low-molecular mercaptans, and then convert the remaining mercaptans into disulfides by catalytic oxidation, so as to achieve The purpose of refining is to make gasoline water-soluble acid-base qualified, copper sheet corrosion qualified, mer...

Examples

Embodiment 1

[0034] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0035] The method step of removing hydrogen sulfide is:

[0036] a, prepare catalyst: get 0.3Kg sodium hydroxide and pour into reactor, add water 2Kg, after fully dissolving, load on 9.5Kg into granular active carbon, be the prepared catalyst after drying;

[0037] b. Preparation of protective agent: take 0.3Kg of sodium hydroxide, add 0.75Kg of water, add 0.004Kg of dimethylguanidine, and then add 0.004Kg of cobalt phthalocyanine for dissolution;

[0038] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepar...

Embodiment 2

[0045] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0046] The method step of removing hydrogen sulfide is:

[0047] a, prepare catalyst: get 0.5Kg potassium hydroxide and pour into reactor, add water 3Kg, spray on 16.2Kg granular activated carbon after fully dissolving, be catalyst after drying;

[0048] b. Preparation of protective agent: take 0.2Kg potassium hydroxide, add 2.5Kg of water to dissolve, add 0.1Kg trimethylguanidine, and add 0.01Kg sulfonated cobalt phthalocyanine to dissolve;

[0049] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepared cat...

Embodiment 3

[0056] FCC gasoline is statically mixed with protective agent, and the catalyst reacts with hydrogen sulfide in gasoline at normal temperature and pressure to generate elemental sulfur, sulfide and hydrogen sulfide, which are adsorbed on the bed and discharged from the system through the sewage tank. To purify the bed and maintain the activity of the catalyst, dehydrogenation tower I and dehydrogenation tower II are used in series.

[0057] The method step of removing hydrogen sulfide is:

[0058] a, prepare catalyst: get 0.4Kg sodium bicarbonate and pour into reactor, add water 2.8Kg, after fully dissolving, load on 8Kg granular active carbon, be the catalyst of preparation after drying;

[0059] b. Preparation of protective agent: take 0.25Kg potassium hydroxide, add 1Kg of water, add 0.005Kg tetramethylguanidine, then add 0.005Kg polyphthalocyanine cobalt and dissolve it;

[0060] c. Loading catalyst: according to the capacity of dehydrogenation tower I or II, the prepared...

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