Method of forming an electrode from a sulfur containing decant oil feedstock

• US 5,167,796 A
• Filed: 05/22/1989
• Issued: 12/01/1992
• Est. Priority Date: 06/30/1981
• Status: Expired due to Term

• Current Assignee: Ucar Carbon Technology Corporation
• Original Assignee: Ucar Carbon Technology Corporation
• Inventors: Didchenko, Rostislav, Lewis, Irwin C.
• Primary Examiner(s): MCFARLANE, ANTHONY R
• Application Number:
  US07/355,833
• Time in Patent Office: 1,289 Days
• Field of Search: 208/216 PP, 208/50, 208/131, 208/89, 208/251 H
• US Class Current: 208/89
• CPC Class Codes: B01J 23/882 and cobalt
• CPC Class Codes: B01J 35/615 100-500 m2/g
• CPC Class Codes: B01J 35/633 less than 0.5 ml/g
• CPC Class Codes: B01J 35/635 0.5-1.0 ml/g
• CPC Class Codes: B01J 35/647 2-50 nm
• CPC Class Codes: B01J 35/66 Pore distribution
• CPC Class Codes: C10B 55/00 Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material cracking oils C10G
• CPC Class Codes: C10B 57/045 containing mineral oils, bitumen, tar or the like or mixtures thereof

Abstract

A premium coke is produced from a decant oil resulting from the catalytic cracking of petroleum oil by selectively hydrodesulfurizing the decant oil and then subjecting the hydrodesulfurized decant oil to delayed coking.

Claims

1. A method of forming an electrode for use in melting steel from a high sulfur decant oil feedstock derived from the catalytic cracking of petroleum, said decant oil feedstock containing a high content of aromatic hydrocarbons with high and low molecular weight fractions consisting essentially of the steps of:

hydrotreating all of the decant oil feedstock directly with hydrogen and a porous catalyst having at least about 80% of its pores with diameters greater than about 102 Angstroms so as to preferentially hydrodesulfurize the higher molecular weight aromatic fraction of said decant oil;

delayed coking said hydrodesulfurized decant oil for producing premium coke and forming said electrode from said premium coke.

2. The method of claim 1, wherein said decant oil has a sulfur content of from about 1.0% to about 4.0% by weight and said premium coke has a sulfur content of less than about 0.8% by weight.

3. The method of claim 1, wherein said decant oil has a sulfur content of from about 1.5% to about 2.5% by weight and said premium coke has a sulfur content of less than about 0.8% by weight.

4. A method of forming an electrode for use in melting steel from high sulfur decant oil feedstock derived from the catalytic cracking of petroleum, said decant oil feedstock containing a high content of aromatic hydrocarbons with high and low molecular weight fractions, consisting essentially of the steps of:

hydrotreating all of the decant oil feedstock directly with hydrogen and a porous catalyst having a mean pore diameter of less than about 200 Angstroms with at least about 80% of its pores with diameters greater than about 170 Angstroms at a temperature of from about 340°

C. to about 450°

C. at a reactor pressure of from about 500 psig to about 3000 psig and a space velocity for the decant oil being from about 0.1 to about 10 hour^-1 so as to preferentially hydrodesulfurize the higher weight aromatic fraction of said decant oil;

delayed coking the hydrodesulfurized decant oil for producing premium coke and forming said electrode from said premium coke.

5. A method of forming an electrode for use in melting steel from high sulfur decant oil resulting from the catalytic cracking of petroleum, said decant oil having a sulfur content of from about 1.0% to about 4.0% by weight and containing both high molecular weight and low molecular weight fractions, consisting essentially of the steps of hydrodesulfurizing at least the high molecular weight fractions of all of said decant oil with hydrogen and a porous catalyst having a surface area of from about 132 to about 250 square meters per gram and having a mean pore diameter of less than about 200 Angstroms with at least about 80% of its pores having diameters greater than about 170 Angstroms at a temperature of about 340°

C. to about 450°

C. at a reactor pressure from about 500 psig to about 3000 psig and a space velocity for the decant oil being from about 0.1 to about 10 hour^-1, delayed coking the hydrodesulfurized decant oil to produce a premium coke having a sulfur content of less than 0.8% by weight, and forming said electrode from said premium coke.

6. The method of claim 5, wherein said decant oil has a sulfur content of from about 1.5% to about 2.5% by weight.

7. A method of forming an electrode for use in melting steel from high sulfur decant oil resulting from the catalytic cracking of petroleum, said decant oil having a sulfur content of from about 1.0% to about 4.0% by weight and containing both high molecular weight and low molecular weight fractions, consisting essentially of the steps of hydrodesulfurizing all of said decant oil with hydrogen and a porous catalyst having a mean pore diameter of less than about 200 Angstroms with at least about 80% of its pores having diameters greater than about 102 Angstroms at a temperature of from about 340°

C. to about 450°

C. at a reactor pressure from about 500 psig to about 3000 psig and a space velocity for the decant oil being from about 0.1 to about 10 hour^-1, delayed coking the hydrodesulfurized decant oil to produce a premium coke having a sulfur content of less than about 0.8% by weight and forming said electrode from said premium coke.