Deep desulfurization method for liquefied petroleum gas

A technology of liquefied petroleum gas and deep desulfurization, which is applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of excessive liquefied gas total sulfur, complicated process flow, corrosion, etc., to reduce the pressure of environmental protection, high catalyst activity, process Easy to use effect

Inactive Publication Date: 2007-11-28
北京石大世通科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional liquefied petroleum gas refining device includes two parts: alcohol amine dehydrogen sulfide and Merox extraction oxidative sweetening. Alcohol amine dehydrogen sulfide refining technology is very mature, but there are many problems in Merox extraction oxidative sweetening: (1) pre-alkali The utilization rate of washing caustic lye is low, and the discharge of waste caustic slag is large. In addition, the caustic soda used in Merox extraction must be replaced regularly, and there is also the problem of waste caustic slag discharge, which has caused great pressure on the refinery's environmental protection; (2) The problem of excessive total sulfur in liquefied gas and unqualified copper sheet corrosion often occurs. Extracting the oxidized caustic soda with light oil can alleviate the problem of total sulfur exceeding the standard, but it cannot solve the problem of copper strip corrosion; Washing of liquefied petroleum gas after extraction produces a large amount of alkaline wastewater, causing serious environmental pollution problems
[0005] After the liquefied petroleum gas is washed with alcoholamine, the hydrogen sulfide content of the liquefied petroleum gas can be reduced to 20μg·g under normal conditions -1 Even a few μg·g -1 Below, a small amount of residual hydrogen sulfide is easily oxidized to elemental sulfur in the subsequent sweetening process, resulting in unqualified copper corrosion

Method used

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  • Deep desulfurization method for liquefied petroleum gas

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Effect test

Embodiment 1

[0055] The raw material contains 29μg·g -1 Hydrogen sulfide sulfur, 50μg·g -1 Carbonyl thiosulfur and 355μg·g -1 The liquefied petroleum gas of mercaptan sulfur, the treatment steps include: ①Using 15wt% monoethanolamine as a desulfurizer, and the addition amount is 3000 μg g of the total weight of the liquefied petroleum gas -1 , the reaction temperature of the carbonyl sulfide hydrolysis reactor is 30°C, the pressure is 0.8MPa, and the volume of the carbonyl sulfide hydrolysis catalyst bed is 5h -1 , the carbonyl sulfide hydrolysis catalyst is K 2 O / γ-Al 2 o 3 ; ② When washing with water in the washing tower, the amount of oxygen-containing deionized water added is 3000 μg·g of the total amount of washing water -1 , the preparation method of oxygen-containing deionized water is as follows: in a tank containing deionized water, air with a pressure of 0.4MPa is introduced, and the volume space velocity of the liquefied petroleum gas passing through the inert ceramic ball ...

Embodiment 2

[0057] The raw material contains 35μg·g -1 Hydrogen sulfide sulfur, 50μg·g -1 Carbonyl thiosulfur and 355μg·g -1 The liquefied petroleum gas of mercaptan sulfur, the treatment steps include: ① use 20wt% methyldiethanolamine as a desulfurizer, and the addition amount is 6000 μg·g of the total weight of the liquefied petroleum gas -1 , the reaction temperature of the carbonyl sulfide hydrolysis reactor is 30°C, the pressure is 0.8MPa, and the volume of the carbonyl sulfide hydrolysis catalyst bed is 5h -1 , the carbonyl sulfide hydrolysis catalyst is K 2 O+MgO / γ-Al 2 o 3 ; ② When washing with water in the washing tower, the amount of oxygen-containing deionized water added is 3000 μg·g of the total amount of washing water -1 , the preparation method of oxygen-containing deionized water is as follows: in a tank containing deionized water, air with a pressure of 0.4MPa is introduced, and the volume space velocity of the liquefied petroleum gas passing through the inert cerami...

Embodiment 3

[0059] The raw material contains 35μg·g -1 Hydrogen sulfide sulfur, 50μg·g -1 Carbonyl thiosulfur and 355μg·g -1 The liquefied petroleum gas of mercaptan sulfur, the treatment steps include: ① use 30wt% diglycolamine as a desulfurizer, and the addition amount is 4000 μg·g of the total weight of the liquefied petroleum gas -1 , the reaction temperature of the carbonyl sulfide hydrolysis reactor is 30°C, the pressure is 0.8MPa, and the volume of the carbonyl sulfide hydrolysis catalyst bed is 5h -1 , the carbonyl sulfide hydrolysis catalyst is K 2 O+MgO / γ-Al 2 o 3 +TiO 2 ; 2. When washing with water in the washing tower, the amount of hydrogen peroxide in the deionized water containing hydrogen peroxide is 3000 μg·g of the total amount of washing water -1 , the concentration of hydrogen peroxide in the deionized water is 2wt%, and the liquefied petroleum gas is decomposed by hydrogen peroxide catalyst MnO 2 / γ-Al 2 o 3 The volumetric space velocity of the bed is 5h -1 ...

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Abstract

The liquefied petroleum gas deep desulfurizing process includes the following steps: mixing alcohol amine treated liquefied petroleum gas with desulfurizer aqua, feeding the mixture into a reactor with carbonyl sulfide hydrolyzing catalyst for hydrolyzing carbonyl sulfide into hydrogen sulfide and CO2 and eliminating hydrogen sulfide, regenerating the used desulfurizer, water washing the liquefied petroleum gas to eliminate residual desulfurizer with water containing dissolved oxygen or hydrogen peroxide in a water washing tower with hydrogen peroxide decomposing catalyst in the stuffing layer, eliminating mercaptan from the liquefied petroleum gas through oxidizing mercaptan into disulfide in a mercaptan eliminating reactor with catalyst, and final rectifying in a rectifying tower to eliminate disulfide. The process is simple and practical, and can lower the total sulfide content in liquefied petroleum gas to below 5 ppm.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for deeply removing sulfides in liquefied petroleum gas under the condition of completely no caustic alkali. Background technique [0002] Liquefied petroleum gas (LPG) usually contains H 2 S, COS, CS 2 , mercaptan, thioether and disulfide and other toxic and harmful components, especially the H 2 S, COS and mercaptans are more harmful. If they are not removed, they will cause great pollution to the environment and have a great impact on the subsequent processing. [0003] At present, when LPG is used as industrial and civil fuel at home and abroad, there are requirements on the total sulfur content and the corrosion level of copper sheets. If it is used as a chemical raw material, the requirements are even stricter. Therefore, the deep removal of sulfide in liquefied petroleum gas realizes the The chemical utilization of light hydrocarbons and the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/12
Inventor 柯明许赛威宋昭峥蒋庆哲
Owner 北京石大世通科技发展有限公司
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