Degassing method of liquefied petroleum gas waste alkali residue

A technology for liquefied petroleum gas and waste alkali residue, which is applied in the petroleum industry, hydrocarbon distillation, etc., can solve the problems of direct gas discharge to the atmosphere, the problem of liquid hydrocarbon entering the alkali residue tank, environmental pollution, etc., so as to avoid potential safety hazards and environmental pollution. Effect

Active Publication Date: 2016-08-24
CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, in the process of alkali slag removal, liquid hydrocarbon components are unavoidably carried, and operation errors will cause a large amount of liquid hydrocarbons to enter the alkali slag tank, and there are serious safety hazards and To solve the problem of environmental pollution, provide a new degassing method for liquefied petroleum gas waste alkali residue

Method used

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  • Degassing method of liquefied petroleum gas waste alkali residue
  • Degassing method of liquefied petroleum gas waste alkali residue

Examples

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Effect test

Embodiment 1

[0020] In a liquefied petroleum gas alkali washing and waste alkali residue degassing system, the liquefied petroleum gas and the lye including circulating lye and fresh lye are contacted in the alkali washing tower, and then enter the settling tank together with the lye, and the liquefied petroleum gas Discharge from the top of the settling tank, 20% of the lye at the bottom of the settling tank by weight enters the mixer as the circulating lye and mixes it with fresh lye and returns to the alkali washing tower, and 80% enters the alkali slag degassing tank as spent lye. The amount of liquefied petroleum gas contained in alkali residue is 12% (volume). The top of the alkali slag degassing tank is equipped with a gas discharge pipeline connected to the low-pressure gas pipe network, and the bottom of the alkali slag degassing tank is equipped with an alkali slag pump to transport the alkali slag to the subsequent processing device. The operating conditions of the alkali slag d...

Embodiment 2

[0022] In a liquefied petroleum gas alkali washing and waste alkali residue degassing system, the liquefied petroleum gas and the lye including circulating lye and fresh lye are contacted in the alkali washing tower, and then enter the settling tank together with the lye, and the liquefied petroleum gas Discharge from the top of the settling tank, 50% of the lye at the bottom of the settling tank by weight enters the mixer as the circulating lye and mixes it with fresh lye and returns to the alkali washing tower, and 50% enters the alkali slag degassing tank as spent lye. The amount of liquefied petroleum gas contained in the alkali residue is 11% (volume). The top of the alkali slag degassing tank is equipped with a gas discharge pipeline connected to the low-pressure gas pipe network, and the bottom of the alkali slag degassing tank is equipped with an alkali slag pump to transport the alkali slag to the subsequent processing device. The operating conditions of the alkali sl...

Embodiment 3

[0024] In a liquefied petroleum gas alkali washing and waste alkali residue degassing system, the liquefied petroleum gas and the lye including circulating lye and fresh lye are contacted in the alkali washing tower, and then enter the settling tank together with the lye, and the liquefied petroleum gas Discharge from the top of the settling tank, 40% of the lye at the bottom of the settling tank by weight enters the mixer as the circulating lye and mixes it with fresh lye and returns to the alkali washing tower, and 60% enters the alkali slag degassing tank as spent lye. The amount of liquefied petroleum gas contained in alkali slag is 10% (volume). The top of the alkali slag degassing tank is equipped with a gas discharge pipeline connected to the low-pressure gas pipe network, and the bottom of the alkali slag degassing tank is equipped with an alkali slag pump to transport the alkali slag to the subsequent processing device. The operating conditions of the alkali slag dega...

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Abstract

The invention relates to a method for degassing liquefied petroleum gas waste alkaline residues, which aims at solving the problems of environment pollution and waste of waste gas in the prior art. According to the method for degassing liquefied petroleum gas waste alkaline residues, firstly liquefied petroleum gas and alkali liquid contact in an alkali washing tower to obtain an effluence (1), then the effluence (1) enters a settling tank for settling separation, gas phases are emitted from the top of the settling tank, alkali liquid on the bottom part of the settling tank containing liquid hydrocarbons enters an alkaline residue degassing tank for degassing, hydrocarbon components obtained from the top of the alkaline residue degassing tank enter a low pressure gas pipeline network, and alkaline residues obtained from the bottom part of the alkaline residue tank are conveyed to a post treatment device, wherein the operation conditions of the alkaline residue degassing tank are that the pressure measured by a pressure gauge is from -0.08 MPa to normal pressure and the temperature is larger than zero DEG C and reaches 95 DEG C. Based on the method, the problems are solved, and the method can be used for degassing of liquefied petroleum residues.

Description

technical field [0001] The invention relates to a method for degassing waste alkali residue of liquefied petroleum gas. technical background [0002] The liquefied petroleum gas (liquid hydrocarbon for short) produced by the refinery is an important raw material for fine chemicals, which generally contains a certain amount of sulfide, which must be removed by chemical or adsorption methods according to the use or storage requirements of downstream processing devices. The main sulfides in liquid hydrocarbons are hydrogen sulfide and mercaptans. The conventional process adopts liquid hydrocarbon sweetening technology, and the commonly used methods use alkali elution to remove residual hydrogen sulfide and Melox extraction and oxidation process for sweetening. [0003] CN201210010236 relates to a device and treatment method for desulfurization and neutralization of liquefied gas alkali slag, the device includes an alkali slag oxidative desulfurization carbonization neutralizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/00
Inventor 卢卫韩中枢王家见路荣博张相建高艳霞李孔全王建伟
Owner CHINA PETROLEUM & CHEM CORP QINGDAO RES INST OF SAFETY ENG
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