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Method for inhibiting generation of grease in MTO alkali wash system

A technology for producing olefins and olefin bases from methanol, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve problems such as excessive butter, and promote the dissolution of inhibitors, improve the inhibitory effect, and improve the inhibitory efficiency Effect

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The technical problem to be solved by the present invention is the problem that there are many butters in the prior art, and a new method for inhibiting the production of butter in the methanol-to-olefins alkaline cleaning system is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Inject the butter inhibitor into the circulating strong alkali, medium alkali and weak alkali of the MTO alkaline cleaning system, the antioxidant in the butter inhibitor is 2,5-di-tert-butylhydroquinone bisphosphite, the mass fraction 5%, the polymerization inhibitor is triacetone amine, and the mass fraction is 20%, and the dispersant is sodium thiosulfate, and the mass fraction is 15%, and the solvent is deionized water, and the mass fraction is 60%. The amount is 100ppm, the device runs for 145 minutes, samples are taken for analysis, and the polymer content in the lye is calculated, and the polymer content in the lye reaches 0.17%.

Embodiment 2

[0033] Inject the butter inhibitor into the circulating strong alkali, medium alkali and weak alkali of the MTO alkaline cleaning system, the antioxidant in the butter inhibitor is 2,5-di-tert-butylhydroquinone bisphosphite, the mass fraction 15%, the polymerization inhibitor is triacetone amine, and the mass fraction is 10%, and the dispersant is sodium thiosulfate, and the mass fraction is 5%, and the solvent is deionized water, and the mass fraction is 70%. The amount is 200ppm, the device runs for 145 minutes, samples are analyzed, and the polymer content in the lye is calculated, and the polymer content in the lye reaches 0.22%.

Embodiment 3

[0035] Inject the butter inhibitor into the circulating strong alkali, medium alkali and weak alkali of the MTO alkaline cleaning system, the antioxidant in the butter inhibitor is 2,5-di-tert-butylhydroquinone bisphosphite, the mass fraction 10%, the polymerization inhibitor is triacetone amine, and the mass fraction is 15%, and the dispersant is sodium thiosulfate, and the mass fraction is 10%, and the solvent is deionized water, and the mass fraction is 65%. The filling of butter inhibitor The amount is 300ppm, and the device runs for 145 minutes. The sample is analyzed, and the polymer content in the lye is calculated. The polymer content in the lye reaches 0.13%.

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PUM

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Abstract

The invention relates to a method for inhibiting generation of grease in an MTO alkali wash system, and mainly solves the problem about much grease in the prior art. According to the adopted method for inhibiting generation of grease in the MTO alkali wash system, a grease inhibitor is added into an MTO alkali wash tower, and the inhibitor comprises 5-15 percent of an antioxidant, 10-20 percent of a polymerization inhibitor, 5-15 percent of a dispersing agent and 50-80 percent of a solvent in mass fraction; the antioxidant is 2,5-di-tert-butylhydroquinone diphosphonate, the polymerization inhibitor is triacetonamine, and the dispersing agent is sodium thiosulfate. Due to adoption of the technical scheme, the problem can be better solved, and the method can be used for inhibition of generation of the grease in the MTO alkali wash system.

Description

technical field [0001] The invention relates to a method for inhibiting the production of butter in a methanol-to-olefin alkali washing system. Background technique [0002] Ethylene and propylene are the core and most basic raw materials of petrochemical industry. With the development of the economy, the market demand for ethylene and propylene has become more and more vigorous, and the consumption has also increased sharply. However, due to the gradual reduction of oil resources and the rising price of crude oil, the production route using traditional petroleum raw materials will face the challenge of tight supply of raw materials. Coal resources are more abundant than petroleum resources, and the price is low. Using coal to produce ethylene and propylene through methanol can greatly reduce the consumption of petroleum resources and save costs. The methanol-to-olefins (MTO) process emerged in this environment, showing huge potential advantages. [0003] The alkali washi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C11/02
Inventor 张晨张帆金满平费轶
Owner CHINA PETROLEUM & CHEM CORP
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