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Inhibitor of polymerization reaction in hydrocarbon cracking and alkaline cleaning operation

A polymerization reaction and inhibitor technology, applied in the field of inhibitors, can solve problems such as scaling, equipment hazards, and shortened operating cycles

Active Publication Date: 2009-02-04
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A large amount of butter will cause the following serious hazards: (1) It will affect the normal operation of the alkali washing tower and the effect of alkali washing.
(2) A large amount of butter is easy to aggregate and scale, which will block the distributor and packing in the tower, resulting in tower blockage and shortening the operation period of the tower
(3) Increase the consumption of fresh alkali and increase the economic burden
(4) The pressure difference of the alkali washing tower increases, which may cause sodium hydroxide to be carried to the compressor and dryer, causing corrosion and scaling of the equipment seals, which will bring hidden dangers to ethylene production
(5) Harm to the safe operation of the subsequent waste alkali treatment system, waste water treatment system and flare device
(6) Waste alkali containing a large amount of butter seriously affects the environment and increases treatment costs

Method used

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  • Inhibitor of polymerization reaction in hydrocarbon cracking and alkaline cleaning operation

Examples

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Comparison scheme
Effect test

Embodiment 1-36

[0032] 2L of 10% NaOH solution and a certain amount of acetaldehyde were added to a 10L stainless steel reactor in advance, and inhibitors were added. The types and amounts of inhibitors added are shown in Table 1. Take the pyrolysis gas before entering the alkali cleaning operation unit and pass it into the reaction kettle. The temperature of the reaction kettle is controlled at 50°C, and the pressure is controlled at 2.0MPa. After 15 minutes, the gas is released. After the cracking gas is passed through the same method for 15 times, it is analyzed by a mass spectrometer. Method Determination of the polymer concentration in the spent caustic soda (including the polymer attached to the reactor), the results are shown in Table 1.

[0033] NO1 in Table 1 is a blank experiment, NO2-NO5 are comparative examples, and NO6-NO36 are examples of inhibitors of the present invention.

[0034] As can be seen from Table 1, the inhibitors of the present invention in Examples NO6-NO36 have o...

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Abstract

The present invention relates to inhibitor which can inhibit the polyreaction of carbonyl compounds, such as aldehyde and ketone, and unsaturated olefin in the pyrolysis gas of the hydrocarbon cracking technique in the process of alkali cleaning. The inhibitor is composed of water-soluble polymerization inhibitor, water-soluble antioxidant, solvent and water-soluble dispersant; wherein, the molar ratio of the water-soluble antioxidant and the water-soluble polymerization inhibitor is 1 : 2 to 20; the molar ratio of the water-soluble polymerization inhibitor and the solvent is 1 : 1 to 100; the molar ratio of the dispersant and the water-soluble polymerization inhibitor is 1 : 1 to 20; the water-soluble dispersant is selected from Ca Cl2, CaF2, NaCl or NaF or any combination thereof. The inhibitor can effectively inhibit the polyreaction of carbonyl compounds, such as aldehyde and ketone, and unsaturated olefin in the pyrolysis gas in the process of alkali cleaning, and can resolve the produced polymers.

Description

Technical field: [0001] The invention relates to an inhibitor for inhibiting the polymerization reaction of carbonyl compounds such as aldehydes and ketones and unsaturated olefins in the alkali cleaning process in the cracking gas of the hydrocarbon cracking process. Background technique: [0002] As is well known, pyrolysis is the conversion of a compound into one or more other substances simply by heating. In the petroleum and petrochemical industries, pyrolysis is used in the processing of hydrocarbons. This process is commonly referred to as "cracking". When the pyrolysis of hydrocarbons is carried out in the presence of steam, this is often referred to as "steam cracking". Steam cracking of ethane, propane, naphtha, gasoline, and other hydrocarbon feedstocks is used to produce useful olefins. As a by-product of the steam cracking process, oxygenated compounds including carbonyl compounds are formed. These carbonyl compounds include, but are not limited to, aldehyde...

Claims

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Application Information

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IPC IPC(8): C10G9/16
Inventor 何玉莲齐泮仑西晓丽李建忠王刚包静严何昌洪王熺董平关旭孙举邵荣兰贾云刚马建英史亚娟邵伟崔锡红张浩
Owner PETROCHINA CO LTD
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