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Methods and compositions for reducing stress corrosion cracking

a technology composition, applied in the direction of other chemical processes, fuels, chemistry apparatus and processes, etc., can solve the problems of stress corrosion cracking in steel vessels, contamination of ground water supplies, etc., and achieve the effect of reducing stress corrosion cracking

Inactive Publication Date: 2011-07-28
MIDCONTINENTAL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a composition that reduces stress corrosion cracking in steel vessels used for storing and transporting ethanol-containing fluids. The composition includes an oxygen scavenger and a film-forming additive. The method involves introducing the composition into the vessel either concurrently or sequentially with the ethanol-containing fluid. The technical effect is to prevent the formation of stress corrosion cracks in the steel vessel, which can lead to leaks and other safety issues.

Problems solved by technology

However, MTBE has recently been found to contaminate ground water supplies.
It has been observed, however, that transportation and storage of ethanol, and particularly fuel grade ethanol, can cause stress corrosion cracking in steel vessels used in transporting and storing ethanol.

Method used

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  • Methods and compositions for reducing stress corrosion cracking
  • Methods and compositions for reducing stress corrosion cracking
  • Methods and compositions for reducing stress corrosion cracking

Examples

Experimental program
Comparison scheme
Effect test

example 1

Slow Strain Rate Testing of Single-Treated Fuel Grade Ethanol

[0028]The effect on stress corrosion cracking on a steel sample of 13 different additives, either oxygen scavengers or film-forming additives, in fuel grade ethanol was determined in this Example, All testing was performed pursuant to the procedures outlined in ASTM G 129. Each of the additives was combined with a hid grade ethanol at the concentration indicated in Table 1, below, which was then employed to determine the respective additive's efficacy at reducing stress corrosion cracking of a steel sample according to ASTM G 129. A 5 weight percent solution of oxygen scavenger or film-forming additive composition in fuel grade ethanol was prepared by weighing 5 grams of oxygen scavenger or film-forming additive and 95 grams of fuel grade ethanol. The oxygen scavenger or film-forming additive was then dissolved in the 95 g of fuel grade ethanol over a period of about 1 minute at room temperature. Ten mL of the resulting so...

example 2

Slow Strain Rate Testing of Dual-Treated Fuel Grade Ethanol

[0031]Four samples containing both an oxygen scavenger and a film-forming additive were prepared and dissolved in fuel grade ethanol, then tested according to the same conditions set forth in Example 1. The first sample contained a combination of ascorbic acid and 85 weight percent diisopropanol amine (“DIPA”) and was prepared by first preparing a solution of ascorbic acid by dissolving 10 parts by weight of ascorbic acid in 45 parts by weight of fuel ethanol and 45 parts by weight distilled water. 10 parts by weight of this solution was then combined with 90 parts of the 85 weight percent DIPA. The second sample contained a combination of carbohydrazide and DIPA and was prepared by dissolving 25 parts by weight of commercial carbohydrazide in 75 parts by weight distilled water. 10 parts by weight of this solution was then combined with 90 parts by weight of the 85 weight percent DIPA. The third sample contained a combinatio...

example 3

Time-to-Failure from Treated and Untreated Fuel Grade Ethanol

[0033]The time-to-failure of eight steel samples was determined according to ASTM G-129 from an untreated fuel grade ethanol and seven samples of treated fuel grade ethanol. One of the treated samples contained only a film-forming additive, three of the treated fuel grade ethanol samples each contained only an oxygen scavenger, while the other three treated fuel grade ethanol samples each contained both an oxygen scavenger and a film-forming additive. The fuel grade ethanol is the same fuel grade ethanol as described above in Example 1. Additionally, each of the treated samples was the same as described above in Examples 1 and 2. A summary of the samples and the results obtained is provided below in Table 3.

TABLE 3Time-to-Failure from Treated and Untreated Fuel Grade EthanolTime-to-Conc.*FailureSampleType(ppmw)(hours)Untreated Fuel——50.7Grade EthanolDIPAFilm Former50054.5Ascorbic AcidO2 Scavenger50047.2CarbohydrazideO2 Sca...

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Abstract

Compositions and methods for reducing stress corrosion cracking in steel vessels used for storing and / or transporting ethanol-containing fluids. Additives including oxygen scavengers and film-forming additives can be employed together in such ethanol-containing fluids (e.g., fuel grade ethanol) to mitigate stress corrosion cracking in steel vessels, such as pipelines, storage tanks, rail cars, and / or tanker trucks.

Description

BACKGROUND[0001]1. Field[0002]One or more embodiments of the invention relate to methods and compositions for reducing stress corrosion cracking in steel vessels used for storing and / or transporting ethanol-containing fluids.[0003]2. Description of Related Art[0004]Ethanol is becoming an increasingly important resource in the United States and around the world, particularly for use as fuel or a fuel additive. For instance, the United States requires gasoline sold in certain areas of the country to contain a designated percentage of oxygenates, the most common of which being ethanol and methyl-t-butyl ether (“MTBE”). However, MTBE has recently been found to contaminate ground water supplies. Thus, the demand for ethanol in the United States is higher than ever. To cope with this demand, increased supplies of ethanol are being transported using various means from the heartland, where the majority of U.S. ethanol is produced, to coastal regions, where the majority of ethanol is consume...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23F11/00C23F11/08
CPCC10L1/10C10L1/125C10L1/14C10L1/1616C10L1/1832C10L1/1855C10L1/1857C10L1/2225C10L1/2227C10L1/226C10L1/23C10L1/2431C10L10/04C23F11/10
Inventor KOROSEC, PHILIP S.
Owner MIDCONTINENTAL CHEM