Inhibition of popcorn polymer growth
AssigneeBaker Hughes Incorporated
InventorMuslim D. Shahid
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Abstract
It has been discovered that the polymerization of diene compounds, such as butadiene, may be inhibited by the addition of a composition that contains at least one hindered or unhindered phenol, in combination with low nitrogen content component which is a stable nitroxide and/or a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group; and/or a second, different hindered or unhindered phenol, and optionally a hydrogen transfer agent.
Claims16
A method for inhibiting polymerization of diene compounds comprising adding to the diene compound an effective polymerization inhibiting amount of a mixture of:
- a) a first hindered or unhindered phenol selected from the group consisting of:
- tert-butylcatechol (TBC);
- tert-butyl hydroquinone (TBHQ);
- 2,6-di-tert-butyl-4-methoxyphenol (DTBMP);
- 2,4-di-tert-butylphenol;
- 2,5-di-tert-butylphenol;
- 2,6-di-tert-butylphenol;
- 2,4,6-tri-tert-butylphenol;
- butylated hydroxyltoluene (BHT);
- 2,6-di-tert-butyl-4-nonylphenol;
- 2,6-di-tert-butyl-4-sec-butylphenol;
- 2-butyl-4-methylphenol;
- 2-tert-butyl-4-methoxyphenol;
- butylated hydroxyanisole (BHA);
- 2,5-di-tert-butyl hydroquinone (DTBHQ);
- tert-amyl hydroquinone;
- 2,5-di-amyl hydroquinone;
- 3,5-di-tert-butylcatechol;
- hydroquinone;
- hydroquinone monomethyl ether;
- hydroquinone monoethyl ether;
- hydroquinone monobenzyl ether;
- and
- 3,3,3′,3′-tetramethyl,1,1-spirobis-indane-5,5′,6,6′-tetrol (Tetrol);
- b) at least one additional component selected from the group consisting of
- low nitrogen content components selected from the group consisting of a stable nitroxide and a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group;
- and
- a second hindered or unhindered phenol selected from the group a).
A method for inhibiting polymerization of butadiene comprising adding to butadiene an effective polymerization inhibiting amount of a mixture of:
- a) a first hindered or unhindered phenol selected from the group consisting of:
- tert-butylcatechol (TBC);
- tert-butyl hydroquinone (TBHQ);
- 2,6-di-tert-butyl-4-methoxyphenol (DTBMP);
- 2,4-di-tert-butylphenol;
- 2,5-di-tert-butylphenol;
- 2,6-di-tert-butylphenol;
- 2,4,6-tri-tert-butylphenol;
- butylated hydroxyltoluene (BHT);
- 2,6-di-tert-butyl-4-nonylphenol;
- 2,6-di-tert-butyl-4-sec-butylphenol;
- 2-butyl-4-methylphenol;
- 2-tert-butyl-4-methoxyphenol;
- butylated hydroxyanisole (BHA);
- 2,5-di-tert-butyl hydroquinone (DTBHQ);
- tert-amyl hydroquinone;
- 2,5-di-amyl hydroquinone;
- 3,5-di-tert-butylcatechol;
- hydroquinone;
- hydroquinone monomethyl ether;
- hydroquinone monoethyl ether;
- hydroquinone monobenzyl ether;
- and
- 3,3,3′,3′-tetramethyl, 1, 1-spirobis-indane-5,5′,6,6′-tetrol (Tetrol);
- b) at least one additional component selected from the group consisting of
- low nitrogen content components selected from the group consisting of a stable nitroxide and a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group;
- and
- a second hindered or unhindered phenol selected from the group a)
- where the proportion of the a) first hindered or unhindered phenol ranges from about 1 to about 30 wt. % of the mixture and the proportion of b) the additional component ranges from about 5 to about 45 wt. % of the mixture.
Dependencies are inferred from the claim text.