Continuous modification and visbreaking process for crude oil

Abstract

The invention relates to a continuous modification visbreaking process for crude oil. Crude oil such as oil sand asphalt firstly enters a distillation tower A to obtain light distillate oil and heavy distillate oil; the heavy fraction enters a visbreaking reactor, and rapid and efficient visbreaking is completed with the assistance of a solvent represented by aromatic hydrocarbon. Separating out a solvent from a visbreaking product through a flash tower, circulating the solvent back to the visbreaking reactor for recycling, feeding flash tower bottom oil into a distillation tower B, separating out tower top light oil, side distillate oil and tower bottom residual oil, and feeding the tower top light oil and the side distillate oil into a hydrogenation reactor for hydrogenation saturation of olefin. And mixing hydrogenated distillate oil, residual oil at the bottom of the visbreaking tower and light distillate oil obtained by cutting of the distillation tower A to finally obtain a crude oil visbreaking and modifying product. Crude oil can be directly transported for a long distance by adopting a pipeline or an oil tanker after being subjected to modification and viscosity reduction by the process. The process has the characteristics of low gas yield, low asphaltene increment, no coke generation, low reaction temperature, short reaction time, controllable cracking depth, low loss rate and the like, and the solvent can be easily separated from the product for cyclic utilization.

Description

technical field [0001] The invention relates to a modification and viscosity reduction process, in particular to a continuous modification and viscosity reduction process of crude oil. The modified product after deep and efficient viscosity reduction and hydrogenation can be directly transported by pipelines or tankers for long distances. Background technique [0002] In 2018, China's crude oil processing volume exceeded 600 million tons, of which the dependence on foreign countries reached 70%. In order to ensure national energy security, heavy crude oil including Venezuela, Ecuador, Chad, Sudan, and Canadian oil sand bitumen is also listed as an important potential energy source. [0003] The premise of processing unconventional crude oil such as heavy crude oil, heavy oil, ultra-heavy crude oil, oil sand bitumen, lake bitumen is to transport the oil sand bitumen to refineries in China or other countries through long-distance pipelines or tankers. Super-heavy oil is gener...

AI Technical Summary

Problems solved by technology

However, due to the visbreaking of heavy oil into a liquid phase reaction, the hindered diffusion is the controlling step of the reaction of hydrocarbon molecules, and the advantage of this time difference is annihilated.

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