CN-117050775-B - Desulfurization method for high-sulfur inferior heavy oil

Abstract

The invention discloses a desulfurization method of high-sulfur inferior heavy oil, which comprises (1) the inferior heavy oil in a raw material tank is pumped into a filler reactor through a raw material pump, sulfur-containing compounds in the inferior heavy oil react with iron filler under certain temperature, pressure and airspeed, and (2) a reaction product enters a gas-liquid separator to carry out gas-liquid separation, a gas-phase product is sent to be used as boiler fuel, a liquid-phase product is divided into two paths, one path is pumped into a product tank through the product pump, and the other path is pumped and circulated through the product pump to be sent to the inlet of the raw material pump to be mixed with fresh raw materials. The invention pertinently reacts sulfur-containing compounds in inferior heavy oil with filler iron, inactive sulfide is decomposed into active sulfide at high temperature, mercaptan and the like in the active sulfide react with iron to generate ferrous sulfide and corresponding hydrocarbons, hydrogen sulfide reacts with iron to generate ferrous sulfide and hydrogen, and elemental sulfur reacts with iron to generate ferrous sulfide. The invention does not consume hydrogen, does not use catalyst, has mild reaction condition, simple process and low cost.

Inventors

• LIN CUNHUI
• WU SHIKUI
• ZHOU RUJIN
• Zeng xingye
• SHAN SHUFENG
• SUN JIN
• ZHANG ZHANJUN
• HU WEIJIE
• WANG LIANGBIN

Assignees

• 广东石油化工学院
• 茂名绿色化工研究院

Dates

Publication Date

20260505

Application Date

20230807

Claims (1)

1. 1. The desulfurization method of the high-sulfur inferior heavy oil is characterized by comprising the following steps of: (1) The inferior heavy oil in the raw material tank is pumped to a filler reactor through a raw material pump, and the sulfur-containing compound in the inferior heavy oil reacts with the iron filler to obtain a reaction product at a certain reaction temperature, reaction pressure and mass airspeed; (2) The reaction product enters a gas-liquid separator for gas-liquid separation, the gas-phase product is sent to be used as boiler fuel, the liquid-phase product is divided into two paths, one path is pumped to a product tank through the product pump, and the other path is pumped and circulated through the product pump and sent to the inlet of a raw material pump to be mixed with fresh raw materials; in the step (1), the filler adopted by the filler reactor is one of an iron net, an iron chain, an iron sheet and iron particles; In the step (1), the reaction temperature is 200-400 ℃, the reaction pressure is 0.5-2 MPa, and the mass airspeed is 1-10 h -1 ; in the step (2), the circulation ratio of the beating circulation is 0-5.

Description

Desulfurization method for high-sulfur inferior heavy oil Technical Field The invention relates to an oil product desulfurization method, in particular to a desulfurization method for high-sulfur inferior heavy oil. Background Currently, the world crude oil property is changed towards the trend of emphasis and inferior quality, and the heavy and inferior crude oil resources are huge in reserve and are important resources which can be processed and utilized in the future. Besides heavy and inferior crude oil resources, the atmospheric residue obtained by atmospheric and vacuum distillation of crude oil, slurry obtained by a catalytic cracking device, heavy ethylene tar obtained by an ethylene cracking device and the like are also important inferior heavy oil resources with huge yield. The inferior heavy oil has extremely complex composition, high density, viscosity and carbon residue value, contains a large amount of non-hydrocarbon inferior components such as colloid, asphaltene and the like, has high content of hetero atoms such as sulfur, nitrogen, metal and the like, and has become a great difficult problem facing the current oil refining industry in storage, transportation, processing and utilization. The high sulfur content of the inferior residuum easily causes catalyst poisoning in the processing process, and seriously affects the product quality, thereby bringing a plurality of technical problems for heavy oil lightening and clean production. In addition, when inferior heavy oil is used as fuel oil for ships, there is a strict limitation on sulfur content thereof in order to prevent emission pollution from being caused to the ships. Therefore, the sulfur content of the inferior heavy oil must be reduced to an allowable range before comprehensive utilization. The traditional inferior heavy oil desulfurization method mainly comprises hydrodesulfurization, oxidative desulfurization, adsorption desulfurization, biological desulfurization and the like. At present, hydrodesulfurization is still a mainstream technology, sulfur-containing compounds in inferior heavy oil can be converted into substances such as hydrogen sulfide which are easy to remove, the desulfurization efficiency is high, hydrogen is consumed, and the pressure condition is severe due to the fact that the catalyst is relied on. Compared with hydrodesulfurization, the oxidative desulfurization is characterized by no hydrogen consumption and milder reaction conditions, and the oxidative desulfurization is still in the basic research stage at present, so that more problems need to be solved from industrialization. The adsorption desulfurization is to selectively adsorb sulfur-containing compounds through the adsorbent, and has the characteristics of simple operation, high desulfurization efficiency, strong regeneration performance of the adsorbent and the like, but the adsorbent is unstable at high temperature, and the adsorption substances mainly comprise mercaptan and thioether. Biological desulfurization is carried out at ambient temperature and pressure by utilizing microorganisms without using complex and toxic chemicals, but the desulfurization time is long, and the microorganisms generally have the problems of activity, selectivity, service life and the like. Therefore, the above-mentioned inferior heavy oil desulfurization methods all have various limitations, and the available methods are limited mainly by hydrodesulfurization, and a new desulfurization method with low cost, low energy consumption and simple process is needed. Disclosure of Invention The invention aims to provide a high-sulfur inferior heavy oil desulfurization method to solve the technical problems mentioned in the background art. In order to achieve the above purpose, the invention provides the following technical scheme that the desulfurization method of the high-sulfur inferior heavy oil comprises the following two steps: (1) The inferior heavy oil in the raw material tank is pumped to a filler reactor through a raw material pump, and the sulfur-containing compound in the inferior heavy oil reacts with the iron filler to obtain a reaction product at a certain reaction temperature, reaction pressure and mass airspeed; (2) The reaction product enters a gas-liquid separator for gas-liquid separation, the gas-phase product is sent to be used as boiler fuel, the liquid-phase product is divided into two paths, one path is pumped to a product tank through the product pump, and the other path is pumped and circulated through the product pump and sent to the inlet of a raw material pump to be mixed with fresh raw materials. Preferably, in the step (1), the filler used in the filler reactor is one of an iron net, an iron chain, an iron sheet and an iron particle. Preferably, in the step (1), the reaction temperature is 200-400 ℃, the reaction pressure is 0.5-2 MPa, and the mass airspeed is 1-10 h -1. Preferably, in the step (2), the circulation ratio of the beating circul