Thomas Price Ferrell

US Patent:

46701311, Jun 2, 1987

Filed:

Jan 13, 1986

Appl. No.:

6/818583

Inventors:

Thomas M. Ferrell - Houston TX

Assignee:

Exxon Chemical Patents Inc. - Linden NJ

International Classification:

C10G 912
C10G 916

US Classification:

208 48AA

Abstract:

Fouling of equipment used for processing of organic feed streams containing olefinic compounds is controlled by inhibiting polymerization of the olefinic compounds by carrying out the processing in the presence of from about 20 ppb to less than 1000 ppb of a stable free radical, such as a nitroxide.

US Patent:

45697507, Feb 11, 1986

Filed:

Nov 27, 1984

Appl. No.:

6/675372

Inventors:

Darrell W. Brownawell - Scotch Plains NJ
Antonio Gutierrez - Mercerville NJ
Stanley J. Brois - Westfield NJ
Donald F. Jacques - Belle Mead NJ
Gary L. Behelfer - Houston TX
Thomas M. Ferrell - Houston TX
Stephan Ilnyckyj - Mississauga, CA

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

C10G 912
C10G 916

US Classification:

208 48AA

Abstract:

Deposit formation on the interior surfaces of structures confining heated hydrocarbon fluids such as refinery units, particularly preheating stages associated with process units such as distillation units, hydrotreaters and thermal crackers, is inhibited by incorporating in the feed stock a small percentage (usually at least about 0. 0005 weight percent) of a macrocyclic polyamine formed by cyclodehydration of reaction products of hydrocarbon substituted succinic anhydrides or carboxylic acids with poly 3-amino propyl compounds or by acylation of macrocyclic polyamine and polycyclic polyamines with hydrocarbon substituted succinic anhydride or carboxylic acids. It is desirable in some instances to dissolve additionally in the hydrocarbon fluid such as a feed stock along with the macrocyclic polyamine an oil-soluble dispersant, antioxidant and mixtures thereof.