Sludge disposal process

• US 5,490,918 A
• Filed: 11/22/1994
• Issued: 02/13/1996
• Est. Priority Date: 01/25/1989
• Status: Expired due to Term

• Current Assignee: Texaco Incorporated (Chevron Corp.)
• Original Assignee: Texaco Incorporated (Chevron Corp.)
• Inventors: Meek, Thomas D.
• Primary Examiner(s): MYERS, HELANE ELEANORA
• Application Number:
  US08/343,211
• Time in Patent Office: 448 Days
• Field of Search: 208/131
• US Class Current: 208/131
• CPC Class Codes: C10B 39/06 in the oven

Abstract

A process for disposing of industrial waste or petroleum sludge in a delayed coking process wherein said waste or sludge is introduced into the hot coke in combination with steam in the steam cooling phase of the delayed coking process is provided.

Claims

1. A process for deodorizing, sterilizing and disposing of odor producing petroleum sludge or industrial waste and to produce a sanitized and deodorized petroleum coke, said process consisting essentially of disposing of and sanitizing and deodorizing said odor producing petroleum sludge or industrial waste by mixing said sludge or waste with steam and utilizing said mixture during a portion of a steam cooling step of a three stage cooling procedure of hot coke in a delayed petroleum coke process said three cooling stages comprising a) the sludge or waste and steam mixture cooling stage, b) an intermediate water to steam cooling stage, and c) a liquid water cooling stage wherein the hot coke is at a temperature above 725°

F.;

wherein the mixture of steam and sludge or waste is injected during the said steam cooling step after coke drum vapors are diverted to a delayed coke blowdown/vapor recovery system thus exposing the mixture of steam and petroleum sludge or waste to steam distillation or "stripping" just prior to entering and while inside the coke drum and to thermal decomposition once deposited on the hot coke.

2. A process according to claim 1 in which the coke produced in said process is anode grade petroleum coke which is sterile and odor-free.

3. A process according to claim 1 in which coker feedstock is introduced into a delayed coker at a temperature from about 825°

to 950°

F. and said steam cooling step reduces the temperature of said coker to a range from about 675°

to 725°

F.

4. A process according to claim 1 in which the mixture of petroleum sludge and steam are introduced at a rate of about 10,000 to 16,000 pounds per hour.

5. A process according to claim 1, wherein injection of waste or sludge and steam is discontinued and cooling is continued with steam alone.