Method for removing mercaptan in lightweight petroleum product

A technology of light petroleum and products, applied in the direction of refining with oxygen-containing compounds, etc., to achieve the effect of good effect, low investment cost and simple operation

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned patents have improved the Merox sweetening method from different aspects and reduced the discharge of waste lye, but have not fundamentally solved the problem of waste lye discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Inject an activator with a mass content of methanol of 80% and a mass content of methylhydrazine of 20% into catalytic cracked gasoline containing 120 mg / L of mercaptan, the injection amount of the activator accounts for 3 μl / L of the catalytic cracked gasoline, and then inject The theoretical amount of 6 times the volume of oxygen required for the complete reaction of mercaptans in catalytic cracked gasoline, the reactor is a fixed bed reactor with a volume of 400ml and a height-to-diameter ratio of 12:1. The reactor is loaded with 200ml of activated carbon load For the sulfonated cobalt phthalocyanine catalyst, at a temperature of 40°C and a pressure of 0.1 MPa, the catalytically cracked gasoline injected with activator and oxygen is sent into the reactor at a flow rate of 1200ml / h by a DC pump for sweetening reaction. After sweetening The content of mercaptan in FCC gasoline is 4mg / L, and it is still active after 360 hours of operation.

Embodiment 2

[0033]The water mass content is 85%, the activator that the hydrazine hydrate mass content is 15% is injected in the catalytic cracking gasoline that contains mercaptan and is 120mg / L, and the injection amount of activator accounts for 4 μ l / L of catalytic cracking gasoline, then injects and The mercaptan in the catalytic cracking gasoline needs 8 times the volume of the theoretical amount of oxygen required for the complete reaction of mercaptans. The reactor is a fixed bed reactor with a volume of 400ml and a height-to-diameter ratio of 12:1. Cobalt phthalocyanine catalyst, at a temperature of 60°C and a pressure of 0.1MPa, a DC pump is used to send catalytically cracked gasoline injected with activator and oxygen into the reactor at a flow rate of 900ml / h for sweetening reaction. After 360 hours of operation, it still has active. After sweetening process, the content of mercaptan in FCC gasoline is 2mg / L.

Embodiment 3

[0035] The mass content of ethanol is 87%, and the activator that the mass content of unsymmetrical dimethylhydrazine is 13% is injected in the catalytic cracking gasoline that contains mercaptan and is 120mg / L, and the injection amount of activator accounts for 2 μ l / L of catalytic cracking gasoline, then to it Inject 4 times the theoretical volume of oxygen required for the complete reaction of mercaptans in catalytic cracked gasoline. The reactor is a fixed bed reactor with a volume of 400ml and a height-to-diameter ratio of 12:1. The reactor is filled with 200ml of activated carbon. Loaded sulfonated nickel phthalocyanine catalyst, at a temperature of 30°C, a pressure of 0.1MPa, and a volumetric space velocity of 6h -1 The sweetening reaction is carried out under the conditions, and the volume space velocity is calculated according to the ratio of the volume flow rate of catalytically cracked gasoline to the total volume of the activated carbon-supported sulfonated nickel p...

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Abstract

The invention provides a method for removing mercaptan in a lightweight petroleum product. The method comprises the following steps: mixing an activator, a phthalocyanine catalyst and the lightweight petroleum product in a reaction container, injecting oxygen or air for a contact reaction, and collecting products, wherein the activator is a mixture of a hydrazine compound and a solvent, and the phthalocyanine catalyst is one or more selected from metal phthalocyanine, a sulfonated metal phthalocyanine derivative, and a metal polyphthalocyanine compound. The method has the advantages of good mercaptan removal effect, no secondary pollution to gasoline, no discharge of a spent lye, simple operation and low investment cost.

Description

technical field [0001] The invention relates to a method for removing mercaptans in light petroleum products, and is especially suitable for a pretreatment method for removing mercaptans for catalytic cracking light gasoline etherification raw materials. Background technique [0002] Mercaptans are ubiquitous in light petroleum products. Excessive mercaptans will produce a foul smell, affect the quality of oil products, and cause the unstable components in oil products to oxidize and form colloids. Mercaptans corrode metals and intensify the corrosiveness of elemental sulfur. Mercaptans also affect the sensitivity of oil to some additives. Especially in the pretreatment process of etherification feedstock, mercaptans will cause poisoning of diolefin selective hydrogenation catalysts. Therefore, mercaptans in petroleum products must be removed. At present, the demercaptan method commonly used in industry is the catalytic oxidation method, which uses a catalyst to oxidize th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G27/10
Inventor 童凤丫吴明清李涛潘光成
Owner CHINA PETROLEUM & CHEM CORP
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