Coal tar whole fraction hydrotreatment process

Abstract

The invention discloses a hydrocracking treatment technique for coal tar total distillate, which comprises: first mixing with homogeneous catalyst, or adding impurity, gum, asphaltene and coal oil total distillate contained much oxygen element directly into suspended-bed hydrogenation device; cutting the stream with distilling plant to discharge water, distillate less than 370Deg that enters fixed bed reactor for hydrorefining reaction to cut gasolene less than 150Deg and diesel oil 150-370Deg, and tail oil less than 370Deg that recycles to said reactor and converts into light oil product. Compared with prior art, this invention is simple, but high conversion rate and stability.

Description

technical field

[0001] The invention relates to a process for treating coal tar, in particular to a process for producing clean light fuel by using the whole fraction of coal tar as a raw material and using a hydrogenation process. Background technique

[0002] Coal tar is a by-product of coal coking, carbonization and gasification. The whole fraction of coal tar is different from natural petroleum, with complex composition, high content of aromatics, colloids and asphaltenes, high oxygen content of 8-9wt%, especially solid impurity content of 2-7wt%. The impurities in coal tar include inorganic impurities and organic impurities, and the inorganic impurities are mainly iron filings and oxide powders with a particle diameter of about 10 μm. The high-temperature thermal polymer of aromatic hydrocarbon molecules in coal with the main average particle size of organic impurities of 0.5 μm. Among the organic impurities, some coke powder is also included, and its particle size is...

Examples

Embodiment 1～3

[0027] This example is a test of treating the whole fraction of coal tar by adopting the combined process of suspension bed hydrogenation and fixed bed hydrofining. The specific operation process is shown in Figure 1. The residual oil or residual oil in the raw material tank 1 is mixed with the mixed feed prepared by a homogeneous catalyst in a certain proportion and hydrogen 11, and then enters the suspension bed reactor 2, and the flow from the bottom of the suspension bed reactor flows through the settling tank 3 and enters Distillation unit 4 cuts out water 7, light oil fraction 370°C. Among them, the light oil fraction of 370°C to the discharge device, and the rest circulates back to the suspension bed reactor 2 . Test conditions and results are shown in Table 2, and product properties are shown in Table 3. The suspended bed catalyst used is water-soluble nickel phosphomolybdate. The composition and properties of the hydrogenation refining catalyst are as follows: it co...

Embodiment 4

[0029] The combined process of suspended bed and fixed bed hydrofining and deep dearomatization treats the whole fraction of coal tar, and the diesel oil produced can meet the national standards. See attached for specific operation procedure figure 2 , which is basically the same as that of accompanying drawing 1, except that the 150-370°C diesel oil fraction from the distillation unit 6 enters the fixed-bed dearomatization reactor 12 for deep dearomatization reaction. The properties of the hydrotreating catalyst are the same as in Example 1. The composition and properties of the dearomatization catalyst are as follows: 25% tungsten oxide, 5% nickel oxide, and the carrier is alumina containing 10% silica. The pore volume of the catalyst is 0.35ml / g, and the specific surface area is 200m 2 / g. Reaction conditions and results are shown in Table 4, and product properties are shown in Table 5.

[0030] project

[0031] Numbering

[0032] Exampl...

technical field

[0001] The invention relates to a process for treating coal tar, in particular to a process for producing clean light fuel by using the whole fraction of coal tar as a raw material and using a hydrogenation process. Background technique

[0002] Coal tar is a by-product of coal coking, carbonization and gasification. The whole fraction of coal tar is different from natural petroleum, with complex composition, high content of aromatics, colloids and asphaltenes, high oxygen content of 8-9wt%, especially solid impurity content of 2-7wt%. The impurities in coal tar include inorganic impurities and organic impurities, and the inorganic impurities are mainly iron filings and oxide powders with a particle diameter of about 10 μm. The high-temperature thermal polymer of aromatic hydrocarbon molecules in coal with the main average particle size of organic impurities of 0.5 μm. Among the organic impurities, some coke powder is also included, and its particle size is...

Examples

Embodiment 1～3

[0027] This example is a test of treating the whole fraction of coal tar by adopting the combined process of suspension bed hydrogenation and fixed bed hydrofining. The specific operation process is shown in Figure 1. The residual oil or residual oil in the raw material tank 1 is mixed with the mixed feed prepared by a homogeneous catalyst in a certain proportion and hydrogen 11, and then enters the suspension bed reactor 2, and the flow from the bottom of the suspension bed reactor flows through the settling tank 3 and enters Distillation unit 4 cuts out water 7, light oil fraction 370°C. Among them, the light oil fraction of 370°C to the discharge device, and the rest circulates back to the suspension bed reactor 2 . Test conditions and results are shown in Table 2, and product properties are shown in Table 3. The suspended bed catalyst used is water-soluble nickel phosphomolybdate. The composition and properties of the hydrogenation refining catalyst are as follows: it co...

Embodiment 4

[0029] The combined process of suspended bed and fixed bed hydrofining and deep dearomatization treats the whole fraction of coal tar, and the diesel oil produced can meet the national standards. See attached for specific operation procedure figure 2 , which is basically the same as that of accompanying drawing 1, except that the 150-370°C diesel oil fraction from the distillation unit 6 enters the fixed-bed dearomatization reactor 12 for deep dearomatization reaction. The properties of the hydrotreating catalyst are the same as in Example 1. The composition and properties of the dearomatization catalyst are as follows: 25% tungsten oxide, 5% nickel oxide, and the carrier is alumina containing 10% silica. The pore volume of the catalyst is 0.35ml / g, and the specific surface area is 200m 2 / g. Reaction conditions and results are shown in Table 4, and product properties are shown in Table 5.

[0030] project

[0031] Numbering

[0032] Exampl...

Images