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Selectivity hydrogenation method for whole fraction crack petroleum

A pyrolysis gasoline and selective technology, which is applied in the field of selective hydrogenation of full-distillate pyrolysis gasoline, can solve the problems of unmentioned anti-interference, gel holding capacity and water resistance, and achieves good anti-interference and good low temperature activity. Effect

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1184289C discloses a catalyst for the selective hydrogenation of pyrolysis gasoline and its preparation method and application, including a titanium oxide-alumina composite as a carrier, and the active component metal palladium loaded on the composite carrier, wherein the metal The content of palladium is based on 0.25 to 0.35% (weight) of the total weight of the catalyst. It is said that the catalyst has high space velocity, good selectivity and stability, but does not mention anti-interference, gel capacity and water resistance
However, its low-temperature activity and selectivity need to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take by weighing 300 grams of pseudo-boehmite, 150 grams of α-alumina, 9 grams of scallop powder, mix, then add 25 grams of polyvinyl alcohol solution (mass concentration is 5%), 4.0 grams of nitric acid, concentration is 85% 1.8 grams of phosphoric acid, 1.5 grams of potassium nitrate, 360 milliliters of aqueous solution of 2 grams of magnesium nitrate, extruded into a clover of φ 2.5 mm, dried at 50 ° C for 24 hours and then roasted at 1000 ° C for 4 hours to obtain an improved compound pore structure. permanent alumina carrier Z1. The carrier was presoaked with deionized water, then drained, and the carrier was soaked in excess PdCl 2 Immerse in the impregnating liquid until the impregnating liquid is colorless, drain, dry at 120°C for 4 hours, and roast at 450°C for 4 hours to obtain Pd-based catalyst C1, so that the final Pd content is 0.3% of the weight of the carrier alumina. The catalyst composition, specific surface area, pore volume, and pore distribution are...

Embodiment 2

[0016] A modified alumina carrier Z2 with a composite pore structure was used, and the preparation method of the carrier was the same as in Example 1. The composition of the carrier is shown in Table 1. The Pd-based catalyst C2 was prepared using the same impregnation operation steps and conditions as in Example 1, so that the final Pd content was 0.5% by weight of the carrier alumina. The catalyst composition, specific surface area, pore volume, and pore distribution are shown in Table 1, and the content of each component is based on the weight of the carrier alumina.

Embodiment 3

[0018] A modified alumina carrier Z3 with a composite pore structure was used, and the preparation method of the carrier was the same as in Example 1. The composition of the carrier is shown in Table 1. The Pd-based catalyst C3 was prepared using the same impregnation operation steps and conditions as in Example 1, so that the final Pd content was 0.15% by weight of the carrier alumina. The catalyst composition, specific surface area, pore volume, and pore distribution are shown in Table 1, and the content of each component is based on the weight of the carrier alumina.

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Abstract

The invention relates to a method for selective hydrogenation of full-run pyrolysis gasoline, which mainly solves the technical problem in the prior art that it is difficult to selectively hydrogenate full-run pyrolysis gasoline with high colloid and free water content. The present invention adopts the pyrolysis gasoline and hydrogen of the hydrocarbon compound fraction with C5 hydrocarbon to dry point of 204 DEG C as raw materials, the reaction temperature is 30 to 80 DEG C, the reaction pressure is 2.0 to 3.0 MPa, and the fresh oil space velocity is 2.5 to 5.0 hour-1, under the condition that the hydrogen / oil volume ratio is 60-120:1, the raw material is contacted with the catalyst and reacts to convert the diolefin and alkenyl aromatic components in the raw material into monoolefin and alkylaromatic. Including alumina support, active component metal palladium or its oxide, at least one element selected from IA or IIA in the periodic table or its oxide, at least one element selected from IVA or VA in the periodic table or its oxide Oxide, the specific surface area of ​​the carrier is 40-160 m2 / g, the total pore volume is 0.3-1.2 ml / g, and the carrier has a technical solution of composite pore distribution, which solves this problem well and can be used for full-run pyrolysis gasoline In the industrial production of selective hydrogenation.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of full-fraction pyrolysis gasoline. Background technique [0002] Utilization of pyrolysis gasoline in ethylene plant is one of the main ways to improve the comprehensive economic benefits of the plant. Due to the complex composition and poor thermal stability of pyrolysis gasoline, it is usually used for the extraction of aromatics after the first stage of selective hydrogenation to remove dienes and styrene, and the second stage of hydrodesulfurization. At present, the catalysts for selective hydrogenation of pyrolysis gasoline in industry are mainly Pd-based or Ni-based catalysts, and the middle distillate (C 6 ~C 8 hydrocarbon compound fraction) hydrogenation or whole fraction (C 5 Hydrocarbons to hydrocarbon fractions with a dry point of 204°C) hydrogenation process. Full-run pyrolysis gasoline rich in C 5 、C 9 + (Carbon nine and above) unsaturated components, high in diene, eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/34C10G45/46
Inventor 刘仲能侯闽渤宗弘元赵江
Owner CHINA PETROLEUM & CHEM CORP
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