The method of hydrotreating petroleum fractions

 

(57) Abstract:

The invention relates to the refining, in particular to a method of Hydrotreating petroleum fractions. We propose a method of Hydrotreating petroleum fractions, comprising contacting the feedstock at elevated temperature and pressure with a catalyst containing, wt.%: Nickel oxide 2,5-4,0; molybdenum oxide 8,0-11,0; phosphorus oxide of 0.5 to 1.3; boron oxide of 0.3-1.0 and pre-processed sequentially elementary sulfur in a quantity of 1.0 to 2.5% by weight of catalyst at a temperature of 120-140oAnd hydrogen sulfide-containing gas at a temperature of 150-250oC. the Method provides a residual sulfur content in the product 0,030-0,045%. 1 C.p. f-crystals.

The invention relates to methods of Hydrotreating distillate oil fractions and can be used in the oil industry.

The known process hydrodesulphurization unit in the reactor, containing two layers of catalyst.

The hydrodesulphurization unit oil fractions is carried out in a reactor in which two layers of catalyst are arranged successively at different levels. First, the raw material is in contact with a catalyst containing 8-20% metals VI-VIII groups of the Periodic system (Co-Mo, Ni-Mo, Ni-W is achieved (Ti) in an amount of 2.5-8%

The Hydrotreating is carried out at 343-427oC, partial pressure P 70-210 al, three-dimensional velocity Vc0,2-1,25 h-1the circulation rate of hydrogen 360-1780 nm3/m3raw materials and the molar ratio of hydrogen:feedstock equal 4-80:1. By passing the feedstock over apromotional catalyst, the degree of removal of sulfur and metals reaches > 80% [1]

The disadvantage of this method is that at a pressure of less than 45 MPa and a flow rate more than 2.0 h-1is not provides the hydrogenated feed is cut with a sulfur content less than 0.05% in order To obtain a desired depth of the sulfur removal process is carried out at high pressure and low flow rate.

Known Hydrotreating process, which is conducted in flow-through mode in two series-connected areas. The Hydrotreating catalyst in area 1 contains, 2-4 Ni; Mo 8-15; P 1-4. Catalyst II zone contains Co and/or Ni 2-4; Mo 8-15 and P is 0.5. As the carrier used Al2ABOUT3. This process also does not provide a sufficient degree of hydrodesulphurization unit.

Also known process hydrobromide vacuum gas oil, which is carried out on the catalyst containing NiO 1-8; NGO35-30; P2ABOUT56-38 and Al2O3-1. The catalyst remains active for 6 months and has the following physicochemical characteristics: Sbeats140-250 m2/g, Vthen0,4-0,75 cm3/, the Ratio P(Mi+Ni) 0,7-1,1 [2] the Catalyst malolactic output of middle distillates, has a low degree of desulfurization and service life.

The invention is directed to a process of Hydrotreating petroleum fractions, providing a high gidroobesserivaniya activity.

The problem is solved by the claimed method of Hydrotreating petroleum fractions, comprising contacting the feedstock at elevated temperature and pressure with a catalyst containing, by weight. Nickel oxide 2,5-4,0; molybdenum oxide 8,0-11,0; phosphorus oxide of 0.5 to 1.3; boron oxide of 0.3-1.0 and pre-processed sequentially elementary sulfur in a quantity of 1.0 to 2.5% by weight of catalyst at a temperature of 120-140oAnd hydrogen sulfide-containing gas at a temperature of 150-250oC.

The Hydrotreating process is carried out at a temperature 335-375oC, a pressure of 3.5 to 4.5 MPa, the space velocity of the raw material 2,5-4,0 h-1the ratio of the circulation of the hydrogen-containing gas 200-300 nl/L.

The difference of the proposed method lies in the fact that PR is also in the pre-treatment of the catalyst sequentially elementary sulfur in a quantity of 1.0 to 2.5% by weight of catalyst at 120-140oAnd hydrogen sulfide-containing gas at 150-250oC.

Example 1. The feedstock straight-run diesel fraction, wikipaedia in the temperature range 180-356oWith and containing 0.75 percent of sulfur compounds, is mixed with hydrogen-rich recycle gas and sent to the Hydrotreating reactor with a fixed bed of a catalyst of the following composition, wt. NiO 3,5; NGO3TO 9.5; P2ABOUT50,8;2ABOUT50,7; Al2ABOUT3the rest of it.

In the upper part of the catalyst layers download elemental sulfur in amount of 1.0% by weight of catalyst and heated to 120oC.

Then the temperature was raised to 180oAnd the catalyst is treated with hydrogen sulfide gas.

The Hydrotreating process is carried out in the following conditions: a pressure of 3.8 MPa, the volumetric feed rate of 2.5 h-1the rate of circulation of the hydrogen-containing gas 230 nl/l of raw materials, temperature 350oC.

The sulfur content in the product amounted to 0.04 wt.

Example 2. The feedstock straight-run diesel fraction, wikipaedia in the interval of temperatures 180-356oWith and containing 0,85% of sulfur compounds is mixed with hydrogen-rich recycle gas and sent to the hydrotreater unit with stacjonarny>2
O3the rest of it.

In the upper part of the catalyst layers download elemental sulfur in the amount of 1.75% by weight of catalyst and heated to 130oC.

Then the temperature was raised to 150oAnd the catalyst is treated with hydrogen sulfide gas.

The Hydrotreating process is carried out in the following conditions: a pressure of 3.5 MPa, the volumetric feed rate of 3.0 h-1the rate of circulation of the hydrogen-containing gas at 200 nl/l of raw materials, temperature 375oC.

The sulfur content in the product was being 0.030 wt.

Example 3. The feedstock straight-run diesel fraction, wikipaedia in the temperature range 180-353oWith and containing 0.8% of sulfur compounds, is mixed with hydrogen-rich recycle gas and sent to the Hydrotreating reactor with a fixed bed of a catalyst of the following composition, wt. NiO 4,0; NGO38,0; P2ABOUT51,3;2ABOUT50,3; Al2ABOUT3the rest of it.

In the upper part of the catalyst layers download elemental sulfur in the amount of 2.5% by weight of catalyst and heated to 140oC.

Then the temperature was raised to 250oAnd the catalyst is treated with hydrogen sulfide gas.

Process the multiplicity of circulation of the hydrogen-containing gas at 300 nl/l of raw materials, the temperature of 335oC.

The sulfur content in the product was of 0.045 wt.

Example 4. The feedstock straight-run diesel fraction, wikipaedia in the temperature range 180-353oWith and containing 0,78% of sulfur compounds, is mixed with hydrogen-rich recycle gas and sent to the Hydrotreating reactor with a fixed bed of a catalyst of the following composition, wt. NiO 3,0; NGO310,0; P2ABOUT51,0;2ABOUT50,5; Al2ABOUT3the rest of it.

In the upper part of the catalyst layers download elemental sulfur in the amount of 1.5% by weight of catalyst and heated to 125oC.

Then the temperature was raised to 200oAnd the catalyst is treated with hydrogen sulfide gas.

The Hydrotreating process is carried out in the following conditions: a pressure of 4.0 MPa, the rate of circulation of the hydrogen-containing gas 240 nl/l, the volumetric feed rate of 3.5 h-1temperature 360oC.

The sulfur content in the product was 0,042 wt.

The proposed method of Hydrotreating provides obtaining diesel fuel with a low content of sulfur compounds at low pressure and large flow rate due to the use of the catalyst of choice is to reduce the content of formed coke on the catalyst.

Using the proposed method of Hydrotreating of crude oil provides in comparison with known methods the following benefits: improved performance setup when getting low-sulfur product and reducing energy consumption.

1. The method of Hydrotreating of petroleum fractions by contacting the feedstock with a catalyst containing Nickel oxide, molybdenum oxide, phosphorus oxide, aluminum oxide at elevated temperature and pressure, wherein the used catalyst, optionally containing boron oxide in the following ratio, wt.

Nickel oxide 2,5 4,0

Molybdenum oxide 8,0 11,0

The phosphorus oxide 0,5 1,3

The boron oxide 0,3 1,0

Alumina Rest

and pre-processed sequentially elementary sulfur in a quantity of 1.0 to 2.5% by weight of a catalyst at a temperature of 120 140oAnd hydrogen sulfide-containing gas at a temperature of 150 250oC.

2. The method according to p. 1, wherein the Hydrotreating is carried out at a temperature of 335 375oC, a pressure of 3.5 to 4.5 MPa, the space velocity of the raw material 2,5 4,0 h-1the ratio of the circulation of the hydrogen-containing gas 200 300 nl/l of raw materials.

 

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Method of refining // 2074882
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14 cl, 10 tbl, 24 ex

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