Nova Patents
US3779902A

Preparation of mineral free asphaltenes

Abstract

Disclosed herein is an invention directed to a method of deasphalting in which a desired amount of asphalt is removed by adjusting the solvent power of the solvent-feed system to obtain a desired cotangent theta for the system. Also disclosed is the application of the cotangent theta principle to two-stage deasphalting of Athabasca bitumen.

US3779902A, drawing sheet 1
Sheet 1 of 2

Term

Term ended

Expired 18 December 1990, 35.8 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

2 sheets

  1. Sheet 1
  2. Sheet 2