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Method for handling oil refining alkaline residue

A treatment method, a technology of refining alkali residue, applied in the direction of heating water/sewage treatment, petroleum industry, refined hydrocarbon oil, etc., can solve the problems of sewage discharge, chemical raw materials cannot be recovered, and mist entrainment is not considered, and the treatment can be achieved Low cost, saving construction investment, no secondary pollution effect

Inactive Publication Date: 2004-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the problem of mist entrainment in the process of lye evaporation and concentration, so it cannot recover other chemical raw materials except sodium carbonate, nor can it solve the problem of sewage discharge

Method used

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  • Method for handling oil refining alkaline residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The alkali refined alkali slag of atmospheric distillation overhead fraction contains COD 23317mg / l; volatile phenol 835mg / l; sulfide 3375mg / l; pH value is 14; solid content 10%. Components of the evaporation accelerator: polyoxypropylene polyoxyethylene polymer (molecular weight about 9500) accounts for 60%, ethanol accounts for 21%, and water accounts for 19%.

[0025] Add the evaporation accelerator to the alkali slag at a concentration of 60 μg / g (the flow rate of the alkali slag is 1 ton per hour), and use a rising film evaporator to evaporate at normal pressure and 108°C, and return the evaporated gas phase condensate to the atmospheric and vacuum device to replace the process Inject water. Noncondensable gas and concentrated alkali slag (solid content 47%) are incinerated under the combustion of heavy oil to generate Na 2 CO 3 、Na 2 SO 4 , At the same time recovery of combustion heat, steam production, combustion conditions 810 ℃, -85Pa. 60% of the combustio...

Embodiment 2

[0028] Catalytic gasoline alkali residue contains COD 335750mg / l; volatile phenol 10000mg / l; sulfide 26150mg / l; pH value 14; solid content 35%. Components of the evaporation accelerator: polyoxypropylene polyoxyethylene polymer (molecular weight about 7500) accounts for 71%, methanol accounts for 16%, and water accounts for 13%.

[0029] Add the evaporation accelerator to the alkali slag with a flow rate of 0.5 tons / hour at a concentration of 80 μg / g, and evaporate it at normal pressure and 104°C with a steaming ball, and the evaporated gas phase condensate is used as process water. The solid content of concentrated alkali slag is 45%, and it is burned together with non-condensable gas under the combustion of heavy oil to generate Na 2 CO 3 、Na 2 SO 4 , At the same time recovery of combustion heat, by-product steam, combustion conditions 880 ℃, -75Pa. 70% of the combustion products are solid and the rest are molten.

[0030] The COD content of the discharged sewage is 180...

Embodiment 3

[0032] Liquid hydrocarbon alkali residue contains COD33071mg / l; volatile phenol 2134mg / l; sulfide 1189mg / l; pH value is 14. Components of the evaporation accelerator: polyoxypropylene polyoxyethylene polymer (molecular weight about 11500) accounts for 43%, ethanol accounts for 10%, and water accounts for 47%.

[0033] The evaporation accelerator is added into the liquid hydrocarbon alkali slag at a flow rate of 300 kg / h at a concentration of 60 μg / g, the flow rate of the alkali slag is 300 kg / h, and the solid content is 15%. Use a rising film evaporator to evaporate at normal pressure and 109°C, and the evaporated gas phase condensate (about 120 kg / hour) returns to the atmospheric and vacuum device to replace the process water injection. The solid content of concentrated alkali slag is 46%. It is incinerated with non-condensable gas under the combustion of heavy oil to generate Na 2 CO 3 、Na 2 SO 4 , At the same time recovery of combustion heat, steam production, combustio...

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Abstract

A treatment method for oil refining soda slag, comprising: evaporating oil refining soda slag containing an evaporation accelerator at 101-115°C, recycling the evaporated gas-phase condensate, and feeding the concentrated soda slag into an incinerator at 750-950°C Combustion generates sodium carbonate and sodium sulfate, wherein the composition of the evaporation accelerator is: polyoxypropylene polyoxyethylene polymer 30-85%, low-carbon alcohol 5-23%, water 5-55%. The evaporation accelerator used in the method of the present invention can effectively suppress the entrainment of mist, and the evaporation condensate does not contain alkali slag, which can be completely reused. At the same time, the waste water and waste gas are discharged up to the standard, and the combustion heat can also be used to produce steam, and the combustion products are sodium carbonate and Sodium sulfate has also reached the level of industrial utilization. Therefore, the method of the invention can not only meet the requirements of clean production in the oil refining industry, but also save resources and energy.

Description

technical field [0001] The invention relates to a treatment method for alkali residue discharged from an industrial oil alkali refining system of petroleum refining. technical background [0002] Refinery soda residue is the waste lye produced during the electrochemical refining of oil products in the oil refining industry. Alkali slag contains different concentrations of free alkali (NaOH), neutral oil, and a large amount of organic acidic substances (in the form of sodium salts, such as creosote, naphthenic acid and sulfides, mercaptans, thiophenols, etc.) and Organic sulfides such as sulfides and thiophenes are foul-smelling, and the pretreatment and comprehensive utilization of alkali slag, as well as the treatment of alkali slag wastewater after pretreatment and comprehensive utilization, have always been a problem that plagues the environmental protection work of refineries. [0003] The current treatment technology of alkali slag mainly includes direct treatment meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04C02F1/04C10G19/08
Inventor 宋星星
Owner CHINA PETROLEUM & CHEM CORP
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