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Catalytic gasoline fixed bed alkaline-free sweetening method

A technology of catalytic cracking gasoline and sweetening of mercaptans, which is applied in the petroleum industry, refining hydrocarbon oil, etc., can solve the problems of polluting the environment and discharging a large amount of lye, and achieves the effects of protecting the environment, eliminating emissions, and having a good activation effect

Active Publication Date: 2007-04-25
一重集团大连工程建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fixed-bed non-alkali desulfurization method for catalytic cracking gasoline in order to solve the problems of massive discharge of lye and environmental pollution in the existing demercaptanization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A 1 million ton catalytic cracking project of a large oil refinery, using two 120m 3 The fixed-bed non-alkali sweetening oxidation tower is switched for sweetening, and each mercaptan oxidation tower is equipped with 72 tons of sweetening catalysts loaded with activated carbon of 0.22 tons of phthalocyanine copper sulfonate. FCC gasoline containing 32ppm of mercaptan sulfur per ton is first mixed with 30g of activator, and 0.05m 3 The amount of air is continuously introduced. The formula of the activator is: 2.7g of methylguanidine, 0.02g of copper phthalocyanine sulfonate, and 27.28g of ethanol. The mixture is passed into the sweetening oxidation tower, the temperature is 30°C, the pressure is 0.3MPa, and the volume space velocity is 1h -1 . After passing through the mercaptan oxidation tower, the mercaptan sulfur content of FCC gasoline is 2ppm.

Embodiment 2

[0022] The 1.1 million tons catalytic cracking project of a large oil refining enterprise adopts two 140m 3 The fixed-bed non-alkali sweetening oxidation tower is switched for sweetening, and each mercaptan oxidation tower is equipped with 84 tons of sweetening catalysts loaded with 0.35 tons of polyphthalocyanine cobalt activated carbon. FCC gasoline feed containing 41ppm of mercaptan sulfur per ton is first mixed with 45g of activator, and 0.2m 3 The amount of air is continuously introduced. The formula of the activator is: 2.7g of dimethylguanidine, 0.03g of cobalt phthalocyanine sulfonate, and 42.27g of ethanol. The mixture is passed into the mercaptan oxidation tower, the temperature is 25°C, the pressure is 0.25MPa, and the volume space velocity is 1.2h -1 . After passing through the mercaptan oxidation tower, the mercaptan sulfur content of FCC gasoline is 3.1ppm.

Embodiment 3

[0024] The 800,000-ton catalytic cracking project of a large oil refinery company used two 80m 3 The fixed-bed non-alkali sweetening oxidation tower is switched for sweetening, and each mercaptan oxidation tower is equipped with 48 tons of sweetening catalysts loaded with activated carbon of 0.24 tons of phthalocyanine cobalt sulfonate. FCC gasoline feed containing 20ppm of mercaptan sulfur per ton is first mixed with 35g of activator, and 0.1m per ton of gasoline is injected 3 The amount of air is continuously introduced. The formula of the activator is: 1.8 g of tetramethylguanidine, 0.04 g of cobalt phthalocyanine sulfonate, and 33.16 g of ethanol. The mixture is passed into the mercaptan oxidation tower, the temperature is 35°C, the pressure is 0.33MPa, and the volume space velocity is 1.5h -1 . After passing through the mercaptan oxidation tower, the mercaptan sulfur content of FCC gasoline is 1ppm.

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PUM

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Abstract

The invention disclosed a catalyzing de-thiol method which is free of alkali. The method is meant for the cracking gasoline on fixed bed in the petrochemical industry. The main characteristic of the invention is that activator which is the mixture of alcohol, guanidines and de-thiol catalyst is added before the gasoline entered the thiol oxygenizing tower. The guanidines in the activator make the gasoline easily integrated with macromolecule thiol in the gasoline so it's easier to remove the thiol with the phthalocyanine catalyst. Since thedissolubility of phthalocyanine in quaternary ammonium base, the activating effect is even better. The de-thiol catalyst can make the thiol contact the catalyst more sufficiently; besides, the catalyst in the activator can supplement the catalyst loss on the fixed bed so as to remove the thiol in the gasoline completely. Compared to the present technologies which use alkali during the process, the invention has many advantages such as high effect of de-thiol, low cost, cut down the discharge of alkali waste liquid and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, in particular to a method for removing mercaptan in catalytic cracking (FCC) gasoline in a fixed bed without alkali. Background technique [0002] The mercaptans in catalytic cracking (FCC) gasoline are not only corrosive and pollute the air, but also have an unpleasant odor, so demercaptan of FCC gasoline is also called deodorization. [0003] The existing deodorization technology generally refers to the oxidation of mercaptans to disulfides by molecular oxygen with the participation of alkaline medium (sodium hydroxide solution) and catalysts, namely: 2RSH+1 / 20 2 →RSSR+H 2 O. [0004] US4908122 discloses a process for deodorizing acidic hydrocarbon fractions containing mercaptans, which combines the acidic hydrocarbon fractions in the presence of oxygen or air with a catalytic composition that can effectively oxidize mercaptans into disulfides, ammonium hydroxide Contact with ...

Claims

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Application Information

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IPC IPC(8): C10G29/20
Inventor 陆久民傅方堃梁传辉
Owner 一重集团大连工程建设有限公司
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