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A kind of catalytic cracking method of high nitrogen feedstock

A technology for catalytic cracking and high-nitrogen raw materials, applied in catalytic cracking, cracking, processing of hydrocarbon oil, etc., can solve problems such as increase in coke yield, and achieve the effect of improving gasoline octane number, simple process, and improving nitrogen resistance performance.

Active Publication Date: 2021-01-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the currently used anti-nitrogen agents have achieved certain anti-nitrogen effects, they have resulted in increased coke yields (Xu Mingde, Zhong Xiaoxiang, Fan Zhongbi, etc. Discussion on catalytic cracking anti-nitrogen agents [J]. Petroleum Refining, 1993, 24( 4): 34-39)

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  • A kind of catalytic cracking method of high nitrogen feedstock

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Embodiment approach

[0043] One embodiment, the preparation step of the boron-modified phosphorus-containing Y molecular sieve comprises: introducing phosphorus-containing molecular sieve into a boron-containing compound, followed by drying and roasting; wherein, the boron-containing compound is selected from boron oxide, boric acid, At least one of metaboric acid and water-soluble borate, preferably boric acid. The phosphorus-containing Y molecular sieve can be prepared by conventional methods in the art, and the preparation process generally includes steps such as ammonium exchange, phosphorus modification, and roasting treatment. Specifically, the preparation process may include:

[0044] (i) The crystallized Y molecular sieve is exchanged with ammonium salt for 0.3-1 hour in the range of room temperature to 100° C. and then filtered; the ammonium salt can be a commonly used inorganic ammonium salt, which can be selected from ammonium chloride, ammonium sulfate or at least one of ammonium nitr...

Embodiment 1

[0064] This example is used to illustrate the preparation method of the boron-modified phosphorus-containing Y molecular sieve catalyst provided by the present invention.

[0065] (1) Preparation of phosphorus-containing Y molecular sieve

[0066] 10 g NH 4 Cl is dissolved in 2 kilograms of water, and 200 grams (dry basis) of NaY molecular sieves (industrial product of Qilu Catalyst Factory, unit cell constant is 2.447-2.450 nanometers, SiO 2 / Al2 o 3 =3.2, rare earth content RE 2 o 3 =2.8% by weight), exchange and wash at 90°C for 30 minutes, control Na 2 The O content is lower than 0.3% by weight, and the filter cake is obtained by filtration. The resulting filter cake was dried, calcined at 350°C for 2 hours, and then heated to 600°C for 2.5 hours to remove the templating agent. The molecular sieve 100 grams (dry basis) that removes template agent is added with water and is mixed with the molecular sieve slurry that solid content is 40% by weight, then 9 grams of H 3...

Embodiment 2

[0073] This example is used to illustrate the effect of the catalytic cracking catalyst A provided by the present invention in processing high-nitrogen feedstock.

[0074] According to this embodiment figure 1 The flow shown is tested on a riser reactor medium-scale unit. The high-nitrogen raw material used in the test is a mixed raw material of 80% by weight of coker gas oil and 20% by weight of straight-run gas oil, and its properties are listed in Table 2. The high-nitrogen raw material is preheated to 320°C, atomized uniformly by water vapor, and then passed into the riser reactor, where it contacts with the high-temperature regenerated catalyst and undergoes catalytic cracking reaction. After the reaction oil gas is discharged from the riser reactor, it passes through the cyclone in the dilute phase of the settler After the separator is separated, it enters the subsequent separation system. The spent catalyst with charcoal enters the stripping section, and the stripped ...

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Abstract

The invention relates to a catalytic cracking method for a high nitrogen raw material. The method comprises: feeding a high nitrogen raw material into a catalytic cracking reactor, making the high nitrogen raw material contact a catalytic cracking catalyst, and carrying out a catalytic cracking reaction to obtain a reaction product and a spent catalyst; and carrying out charring regeneration on the spent catalyst to obtain a regenerated catalyst, and feeding the obtained regenerated catalyst as the catalytic cracking catalyst into the catalytic cracking reactor, wherein the catalytic crackingcatalyst comprises a boron-modified phosphorus-containing Y molecular sieve, a heat-resistant inorganic oxide and optionally clay. With the method of the present invention, the conversion rate of thehigh nitrogen raw material can be improved, and the product distribution can be optimized.

Description

technical field [0001] The invention relates to a method for catalytic cracking of high-nitrogen raw materials. Background technique [0002] Catalytic cracking is the main process in which heavy petroleum hydrocarbons react under the action of catalysts to produce liquefied gas, as well as light oil products such as gasoline and diesel. It is the most important means of lightening heavy oil in my country. In recent years, the trend of heavy and inferior crude oil has become more and more obvious, and the proportion of inferior raw materials such as refining residue and coker wax oil in catalytic cracking units is increasing continuously when processing conventional raw materials. Compared with vacuum gas oil, the outstanding feature of inferior feedstock is higher nitrogen content, among which basic nitrogen compounds have the most significant impact on the performance of catalytic cracking catalysts. The basic nitrogen compounds in the coking gas oil are adsorbed on the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/02C10G11/04C10G11/05
CPCC10G11/02C10G11/04C10G11/05C10G2300/202C10G2300/305C10G2300/4006C10G2300/4012C10G2300/70
Inventor 李福超张久顺魏晓丽毛安国王迪陈学峰
Owner CHINA PETROLEUM & CHEM CORP
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