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Combination process for deeply desulfurzing liquified petroleum gas and light olefin by solid alkali neutralizing agent and alkali

A technology for liquefied petroleum gas and deep desulfurization, which is applied in the refining of solid alkaline materials, etc., and can solve the problems of passive, large waste liquid discharge, and small device scale.

Inactive Publication Date: 2004-07-07
PETROCHINA CO LTD +1
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  • Summary
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Problems solved by technology

The main problems are: (1) The established devices generally have small-scale problems, and the general processing capacity is 40,000-150,000 tons / year, which requires further transformation and expansion; (2) Poor production flexibility
Due to the single-process design, the whole device needs to be shut down during partial device maintenance, which sometimes makes the production passive; (3) because some refineries do not design back-extraction devices, some disulfides remaining in the lye are circulated in the lye When it is in contact with the liquefied gas again, disulfide is mixed into the liquefied gas, reducing the total sulfur removal effect
(4) The discharge of waste liquid is large, which is not good for environmental protection

Method used

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  • Combination process for deeply desulfurzing liquified petroleum gas and light olefin by solid alkali neutralizing agent and alkali
  • Combination process for deeply desulfurzing liquified petroleum gas and light olefin by solid alkali neutralizing agent and alkali

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Embodiment Construction

[0011] 1. In actual design, the inventor implements the method of the present invention in the following way.

[0012] ① When the raw materials cannot meet the refining index requirements after pre-alkali washing, the desulfurization process is realized according to the following process: the raw materials enter the liquid caustic washing tank (1) or the solid caustic washing tower (2) for pre-alkali elution vulcanization The hydrogen then enters the liquid-liquid reverse extraction tower (3) to contact the recycled agent-alkali in reverse to remove mercaptan, and then enters the sedimentation separation tank (5) through the static mixer (4) for sedimentation and separation. The product is discharged from the top part of the separation tank, and the deactivator lye from the bottom part of the separation tank sequentially passes through the oxidation regeneration tower (6) and the reverse extraction tower (7), and the reverse extraction medium can be light oil.

[0013] ②When the r...

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Abstract

A process for using solid alkali and agent-alkali to deeply desulfurizing the liquefied petroleum gas and light hydrocarbon features that the raw material to be treated passes sequentially through liquid alkali (or solid alkali) washing tank (or tower), liquid-liquid countercurrent extracting tower, and settling separation tank to separate out the refined product and extracting liquid. The agent-alkali liquid also passes through oxidizing regeneration tower and back extracting tower for cyclic use.

Description

Technical field [0001] The invention relates to a combined method for deep desulfurization of liquefied petroleum gas and light hydrocarbons by solid alkali and agent-alkali. It belongs to the improvement of the oil refining method in petrochemical enterprises. It mainly uses solid alkali to remove hydrogen sulfide. Combined with the two methods of agent-alkali desulfurization, the goal of deep desulfurization of liquefied petroleum gas and light hydrocarbons is achieved. Background technique [0002] The sulfur content in light oil products has always been an important issue of general concern. As we all know, sulfides are harmful substances in oil. Their presence will not only cause the quality of oil to decrease, seriously affect its performance, but also cause catalyst poisoning and deactivation during processing; elemental sulfur, hydrogen sulfide and other activities Sulfide is very corrosive and can seriously corrode equipment; especially when light oil is burned as fuel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G19/073
Inventor 夏道宏项玉芝郭洪明张洪滨张振江郭宗光
Owner PETROCHINA CO LTD
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