A method for selective hydrogenation of cracked C6-C8 cuts

A C6-C8, selective technology, which is applied in the field of one-stage selective hydrogenation of pyrolysis gasoline and the selective hydrogenation of cracked C6-C8 fractions, can solve the inability to achieve controllable adjustment of macropore-mesoporous pore diameter and diene hydrogenation. The problem of low selectivity, etc., can achieve the effect of strong coking inhibition ability, improved diene hydrogenation selectivity, and good low temperature activity.

Inactive Publication Date: 2019-01-25
QINZHOU UNIV
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  • Abstract
  • Description
  • Claims
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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
The invention has the disadvantage of low diene hydrogenation selectivity, and provides a new catalyst for one-stage selective hydrogenation of pyrolysis gasoline

Method used

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  • A method for selective hydrogenation of cracked C6-C8 cuts
  • A method for selective hydrogenation of cracked C6-C8 cuts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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

[0042] 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

[0045] 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.

[0046] A palladium solution was prepared to impregnate the alumina carrier 3, dried at 120° C. for 6 hours, and calcined at 500° C. for 5 hours to obtain the catalyst 3 . Catalyst 3 had a palladium content of 0.29 wt%.

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Abstract

The invention relates to a method for carrying out selective hydrogenation on pyrolytic C6-C8 fractions. A catalyst comprises an alumina carrier having a macroporous structure, and a metal active component-palladium loaded on the carrier, wherein the content of the palladium is 0.2-0.35wt% of the total weight of the catalyst, the alumina carrier having the macroporous structure contains auxiliary components-phosphorus and magnesium, and the contents of the auxiliary components-phosphorus (P2O5) and magnesium (MgO) respectively account for 0.1-2.5wt% and 0.1-2.5wt% of the mass of the carrier; the hydrogenation process conditions are as follows: the reaction inlet temperature is lower than or equal to 45 DEG C, the reaction pressure is 2.5-4.5MPa, the volume ratio of hydrogen to oil is 60-450, and the liquid volume space velocity is 3.0-5.5h<-1>. The catalyst is high in adaptability for pyrolysis gasoline raw materials having different arsenic contents and sulphur contents, and is good in low-temperature activity.

Description

technical field [0001] The invention relates to a selective hydrogenation method for petroleum hydrocarbon products, especially suitable for one-stage selective hydrogenation of pyrolysis gasoline, and is a method for selective hydrogenation of cracked C6-C8 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B01J27/18C10G45/40C10G45/52C10G45/10B01J37/08B01J37/02B01J35/10B01J32/00
CPCB01J23/002B01J27/1806B01J27/1856B01J35/1019B01J35/1042B01J35/1047B01J35/1066B01J37/0018B01J37/0201B01J2523/00C10G45/10C10G45/40C10G45/52C10G2300/104C10G2300/1044C10G2300/202B01J2523/22B01J2523/31B01J2523/3712B01J2523/51B01J2523/824
Inventor 罗祥生晁会霞方丽萍
Owner QINZHOU UNIV
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