Oxidation method and equipment for spent caustic in petrochemistry equipment

A petrochemical and waste lye technology, applied in chemical instruments and methods, oxidation treatment of sludge, oxidized water/sewage treatment, etc., can solve problems such as leakage of hot waste lye, and reduce investment costs, investment costs and equipment The effect of minimizing operational hazards

Inactive Publication Date: 2008-04-23
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Heat exchangers in highly corrosive areas additionally represent an increased safety risk for plant operation, since homogeneous liquid-gas mixing must be ensured throughout operation to avoid localized corrosion and resulting leaks together with corrosive heat waste at high pressure lye spill

Method used

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  • Oxidation method and equipment for spent caustic in petrochemistry equipment
  • Oxidation method and equipment for spent caustic in petrochemistry equipment

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Embodiment Construction

[0020] The flow chart of Fig. 1 shows a device for wet oxidation of spent lye in a petrochemical plant according to the prior art. The waste lye (1) is transferred by a high-pressure pump (2). Then, by introducing air or oxygen (3), a liquid-gas mixture (4) composed of waste lye and oxygen-containing gas is generated. It is preheated by the input / output heat exchanger (5) and introduced into the reactor (6) for oxidation. In order to increase the reactor temperature additionally, hot steam can be introduced into the reactor (7). After a residence time dependent on temperature and pressure, the liquid-gas mixture (8) consisting of oxidized alkali and waste gas is led out of the reactor, pre-cooled through the input / output heat exchanger (5), and is cooled The liquid (10) is finally cooled in the second heat exchanger (9). The waste gas (12) is separated from the oxidized lye (13) in the separator (11).

[0021] The flowchart of Figure 2 shows an embodiment of the present invention....

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Abstract

The invention discloses a method for wet oxidizing waste alkali liquor, as well as a device for a petrochemical device. The waste alkali liquor (1) is transported through a high voltage pump (2). A liquid-gas mixture (4) is produced by leading into air or oxygen (3) and then is directly put into a reactor (6) for oxidization. The temperature inside the reactor is adjusted by leading into hot steam (7). The generated liquid-gas mixture (8) consisting of oxidized alkali liquor and waste gas is mixed with the oxidized cold alkali liquor (13c) from a separator (11) due to the temperature and the pressure inside the reactor, and then is further put into the separator to be separated into waste gas (12) and oxidized alkali liquor (13). Partial oxidized alkali liquor (13b) is brought back as refrigeration cycle through a pump (14) and a thermal exchanger (15).

Description

Technical field [0001] The present invention relates to a method for chemical wet oxidation of waste lye in petrochemical equipment, in which oxygen-containing gas or gas mixture is added to a reactor to treat the lye to form oxidized lye and waste gas, which are cooled and discharged from the reactor The mixture is composed of oxidized lye and waste gas, and is separated into waste gas and treated lye in a separator. Background technique [0002] Olefins are obtained from hydrocarbon feeds in petrochemical equipment. Longer chain hydrocarbons are converted into shorter chain hydrocarbons, such as ethylene and propylene, for example by thermal cracking (steam cracking). The cracked gas produced by cracking is washed to remove undesired components, such as carbon dioxide, hydrogen sulfide and mercaptans, and then processed in low-temperature separation. The corrosive waste lye produced here must remove toxic components before entering the biological wastewater treatment, and simil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
CPCC02F1/72C02F11/08C02F2103/365
Inventor H·弗里茨
Owner LINDE AG
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