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A method for selective hydrogenation of cracked C5-C9 cuts

A C5-C9, selective technology, applied in the direction of selective hydrorefining, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of selective hydrogenation of difficult whole-distillation pyrolysis gasoline, which cannot realize macropore- Controllable adjustment of mesopore diameter and other issues to achieve the effect of improving the selectivity of diene hydrogenation, strong ability to inhibit coking, and high activity

Inactive Publication Date: 2019-05-17
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the size of the macropore (300nm or 400nm) is completely determined by the size of the polystyrene droplet introduced twice, that is, the size of the macropore depends on the size of the polystyrene droplet
The pore size cannot be adjusted by partially changing the components of the solution itself and the interaction of organic molecules in the system
Huining Li et al. (Inorganic Chemistry, 2009, 48:4421) also used the sol-gel method to introduce polymethyl methacrylate (PMMA) droplets with a single dispersed phase into the mixed solution using F127 as a template to achieve large Pore-the formation of macropores in mesoporous alumina, the disadvantage is that the size of the macropores is completely determined by the size of the secondary introduction of polymethyl methacrylate droplets, which cannot be achieved by partially changing the components of the solution system itself The adjustment of the pore size is used to realize the formation of the macropore-mesopore composite pore structure, so it is impossible to realize the controllable adjustment of the macropore-mesopore diameter. In the process of use, especially for the macromolecular catalytic process of complex components limitations
CN200610118523.1 The present 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 water content

Method used

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  • A method for selective hydrogenation of cracked C5-C9 cuts
  • A method for selective hydrogenation of cracked C5-C9 cuts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, 8.0 g of the water-soluble chitosan pore-enlarging agent was added to deionized water at 50° C., and then acetic acid was added dropwise until the chitosan was completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh 1.46g of phosphoric acid and 7.35g of magnesium nitrate respectively, and completely dissolve phosphoric acid and magnesium nitrate in 70g of distilled water to form an aqueous solution containing phosphorus and magnesium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, mix well, then add the mixed solution of phosphoric acid and magnesium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite Knead evenly in the stone, and shape it into a clover shape through kneading-extrusion. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 1 containing phosphorus and magnesium. In carrier 1, phosphorus pentoxide is 0.5wt...

Embodiment 2

[0045] Add 8.0 g of the water-soluble chitosan pore-enlarging agent into deionized water at 50° C., and then add acetic acid dropwise until the chitosan is completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh 1.09g of phosphoric acid and 9.12g of magnesium nitrate respectively, completely dissolve phosphoric acid and magnesium nitrate in 70g of distilled water to form an aqueous solution containing phosphorus and magnesium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, mix well, then add the mixed solution of phosphoric acid and magnesium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite Knead evenly in the stone, and shape it into a clover shape through kneading-extrusion. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 1 containing phosphorus and magnesium. Then use phosphorus and magnesium to modify the surface of the ca...

Embodiment 3

[0048] The preparation method of the carrier was carried out according to Example 1. The difference is that the auxiliary component in the carrier also contains cerium, and the water-soluble chitosan pore-enlarging agent is replaced with a non-water-soluble chitosan pore-enlarging agent, and the chitosan formic acid solution is stirred with a magnetic stirrer for 30 minutes to obtain Alumina support with macroporous structure3. The contents of the auxiliary components phosphorus, magnesium and cerium in the carrier are respectively 1.8wt%, 2.0wt%, and 0.6wt% of the weight of the carrier. Its specific surface area and pore size distribution are shown in Table 1.

[0049] A solution containing nickel and tungsten was prepared to impregnate the alumina carrier 3, dried at 120° C. for 6 hours, and calcined at 500° C. for 6 hours to obtain the catalyst 3 . The composition of the catalyst 3 is as follows: the content of tungsten oxide is 5.5wt%, the content of nickel oxide is 14wt...

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Abstract

The invention relates to a method for selective hydrogenation of cracked C5-C9 fractions. The catalyst includes an alumina carrier with a macroporous structure and metal active components nickel and tungsten loaded on the carrier. The content of nickel oxide is based on the total content of the catalyst. The weight is 12‑22wt%, the content of tungsten oxide based on the total weight of the catalyst is 1.5‑8wt%, the hydrogenation reaction process conditions: reaction inlet temperature 40‑55°C, reaction pressure 2.0‑3.5MPa, hydrogen to oil volume ratio 60‑ 150; liquid volume airspeed 3.0-5.5h ‑1 . The catalyst has better gel-holding capacity, strong resistance to arsenic, sulfur resistance, and coking inhibition, and the catalyst has good low-temperature activity. It has strong adaptability to pyrolysis gasoline raw materials with different arsenic and sulfur contents.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of petroleum hydrocarbon products, especially a method suitable for selective hydrogenation of cracked C5-C9 fractions. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking industrial production of ethylene and propylene, including C5-C10 fractions. The composition of pyrolysis gasoline is very complex, mainly including benzene, toluene, xylene, mono-olefins, di-olefins, straight-chain alkanes, cycloalkanes, and organic compounds of nitrogen, sulfur, oxygen, chlorine and heavy metals, etc., a total of more than 200 components, of which Benzene, toluene, and xylene (collectively referred to as BTX) are about 50-90%, and unsaturated hydrocarbons are 25-30%. According to the characteristics of a large amount of aromatics in pyrolysis gasoline, it has a wide range of uses. It can be used as a blending component of gasoline to produce high-octane gasoline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188B01J35/10C10G45/08C10G45/38
CPCC10G45/08C10G45/38B01J27/188C10G2300/201C10G2300/202C10G2300/70C10G2400/02B01J35/638B01J35/651B01J35/635B01J35/615
Inventor 罗祥生晁会霞肖长根柳力凤李剑云
Owner QINZHOU UNIV
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