Superimposed oil hydrotreating device and superimposed oil hydrotreating method

Abstract

The invention discloses a superimposed oil hydrotreating device and a superimposed oil hydrotreating method. The device comprises a hydrogenation reactor, a hydrogenation separation device, a hydrogenation circulating pump and a hydrogenation circulating cooler, wherein an olefin-rich superimposed oil feeding pipeline is connected with an inlet of the hydrogenation reactor; an outlet of the hydrogenation reactor is connected with the hydrogenation separation device; a discharge pipeline at the top of the hydrogenation separation device is used as a hydrogenation tail gas extraction pipeline; abottom discharging pipeline is divided into two paths, one path is connected with the hydrogenation circulating pump and the hydrogenation circulating cooler, then is combined with the olefin-rich superimposed oil feeding pipeline and is finally connected with the inlet of the hydrogenation reactor, and the other path is used as a superposed oil hydrogenation product extraction pipeline or is connected with a stripping tower system; and a fresh hydrogen feeding pipeline is connected with the inlet of the hydrogenation reactor. Through a one-stage liquid-phase hydrogenation treatment mode, allthe olefin-rich superimposed products can be treated; and the device and the method have the characteristics of simple process, reduced investment, high reaction conversion rate, high selectivity andthe like.

Description

technical field [0001] The invention relates to the field of olefin hydrogenation, and more specifically, to a composite oil hydrotreating device and a composite oil hydrogenation method. Background technique [0002] by C 2 ~C 6 Olefins obtained by superimposition or oligomerization 4 ~C 12 The olefin mixture can be directly used as chemical raw materials, or the alkane obtained by hydrogenation saturation can be used as gasoline and diesel components or as an organic solvent. In recent years, with the increasingly stringent environmental protection regulations, the requirements for olefin content in gasoline have been continuously increased, and the market demand for isoparaffins has increased sharply, especially for alkylated oil and chemical products, which are composed of propylene or butene through lamination- The technical route of hydrogenation to produce multi-branched isoparaffins as gasoline high-octane components has been highly valued at home and abroad. In ...

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Problems solved by technology

[0003] CN1381549A discloses a method for producing isooctane and liquefied petroleum gas for vehicles by hybrid carbon four oligomerization-hydrogenation, including carbon four superposition to generate isooctene and isooctene hydrogenation method, but this technology does not involve specific Hydrogenation device and method, industrial application cannot be concretely implemented

This method belongs to the field of fine chemical industry, and co-produces isooctane while preparing isooctaldehyde, and cannot be applied to the hydrogenation process of isooctene on a large scale, especially in the field of producing high-octane gasoline

[0005] CN101209951A discloses a method for catalytic hydrogenation of olefins, which is different from conventional hydrogenation methods for olefins, adopts the method of catalytic rectification, and carries out the reaction and separation in one tower. The hydrogenation method of catalytic distillation awaits industrial verification

[0006] It can be seen from the above that there is either no feasible superimposed oil hydrogenation process in this field, or the traditional hydrogenation method uses gas-phase hydrogenation reactions such as circulating hydrogen compressors, heating furnaces / steam heaters, etc., which requires more investment and lower energy consumption. Large, no practical industrial application value

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