초록 ▼

A method to inhibit coke formation on heat transfer surfaces used to heat or cool a petroleum feedstock at coke-forming conditions is disclosed. The heat transfer surfaces are treated with an effective amount of phosphonate to inhibit coke formation on the heat transfer surfaces. The phosphonate is

A method to inhibit coke formation on heat transfer surfaces used to heat or cool a petroleum feedstock at coke-forming conditions is disclosed. The heat transfer surfaces are treated with an effective amount of phosphonate to inhibit coke formation on the heat transfer surfaces. The phosphonate is essentially free from contributing to corrosion and from producing detrimental by-products.

대표청구항 ▼

[ We claim:] [1.] A method for inhibiting the formation of coke on heat transfer surfaces in contact with petroleum feedstocks, which feedstocks are at a temperature of from about 400.degree. to about 1100.degree. C. comprising:contacting said heat transfer surfaces with an effective amount to inhib

[ We claim:] [1.] A method for inhibiting the formation of coke on heat transfer surfaces in contact with petroleum feedstocks, which feedstocks are at a temperature of from about 400.degree. to about 1100.degree. C. comprising:contacting said heat transfer surfaces with an effective amount to inhibit coke formation of a phosphonate of the formula (R'Y).sub.2 P(X)R", wherein X and Y are chalcogens selected from the group consisting of oxygen and sulfur, R' is selected from the group consisting of alkyls, alkylaryls, aryls, arylalkyls and heteroatom-containing substituents having 4 to 20 carbon atoms with the proviso that the heteroatom of said heteroatom-containing substituent is not directly bonded to the phosphorous atom and R" is selected from the group consisting of alkyl, arylalkyl, alkylaryl, aryl and heteroatom-containing substituents having 6 to 30 carbon atoms with the proviso that the heteroatom of said heteroatom-containing substituent is not directly bonded to the phosphorous atom.