Hydrogen cycle differential catalytic distillation desulfurization production process and equipment

Abstract

The invention relates to a hydrogen circulation differential catalyst distillation and desulfuration method and equipment for producing ultra-low sulphur national-V naphtha and diesel oil. Particularly, by using FCC (Fluid Catalytic Cracking) full-fraction gasoline, coker gasoline or diesel as raw material oils, and adopting a selective hydrogenation circulation catalyst distillation method, a sulphur-containing substance in the naphtha and diesel oil is removed in a catalyst distillation tower, and the national-V naphtha and diesel oil with the sulphur content of not more than 10 ppm is produced. The hydrogen circulation differential catalyst distillation and desulfuration method is simple in process, less in equipment, small in investment, and strong in maneuverability, and is capable of effectively solving the problem of quality upgrading and rebuilding of an oil product, promoting industrial upgrading, and lightening the pollution of automobile exhaust emission to the environment, thereby being important in social meaning and economic benefit.

Description

technical field [0001] The invention relates to a production process and equipment for gasoline and diesel desulfurization, in particular to a hydrogen cycle differential catalytic distillation desulfurization method and equipment for producing ultra-low sulfur national V gasoline and diesel, belonging to the field of petrochemical technology. Background technique [0002] With the increasing number of automobiles in our country, the pollution caused by automobile exhaust emissions is becoming more and more serious. National V standard vehicle gasoline and diesel will replace National IV standard to achieve at least 10% reduction of nitrogen oxides and directly reduce the amount of PM2.5 in exhaust gas. emission. Therefore, the production of high-quality ultra-low sulfur gasoline and diesel has become a major trend for the world's modern oil refining industry to meet increasingly stringent environmental regulations. [0003] Catalytic distillation desulfurization technology...

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Problems solved by technology

Invention patents CN1429884A, CN1189183A, and US5597476 all disclose the desulfurization technology using the principle of catalytic distillation. The difference is that the hydrogenation desulfurization process disclosed by CN1429884A first enters the raw material gasoline into a fixed-bed reactor, and the reacted gasoline enters the distillation tower for distillation. The heavy fraction at the bottom of the tower finally enters the catalytic distillation tower. The whole desulfurization process is complicated. The desulfurization reaction has gone through the reaction in the reactor and the conversion and separation in the catalytic distillation tower. The conversion and separation in the catalytic distillation tower cannot promote the low-boiling sulfur compounds in the previous reactor. The reaction conversion to higher boiling point sulfides has not realized the complete coupling of desulfurization reaction and distillation separation, and the technical advantages of catalytic distillation are insufficient; while CN1189183A and US5597476 are disclosed by the American CD-Tech (formerly CR﹠L) company Technology, CN1189183A disclosed catalytic distillation desulfurization process is to enter the feed oil into a catalytic distillation tower, but the light gasoline fraction with high olefin content and low sulfur content will also contact the hydrodesulfurization catalyst, which increases the chance of hydrogenation saturation of light gasoline fraction olefins , will cause a large octane loss; the CDHydro / CDHDS two-tower catalytic distillation desulfurization technology disclosed in US5597476 has complex structure of equipment in the tower, small catalyst storage, difficult loading and unloading, complicated operation, difficult adjustment, and large heat load and other shortcomings

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