A kind of hydrocracking method

Abstract

The invention discloses a hydrocracking method. After the heavy distillate oil is mixed with hydrogen, it first enters the hydrofinishing reactor for hydrofinishing reaction; the hydrofinishing reaction effluent directly enters the hydrocracking reactor, and contacts and reacts with the graded catalyst bed in the cracking reactor; At least two cracking catalyst beds are arranged in the hydrocracking reactor, and the hydrogenation activity of the hydrocracking catalyst tends to decrease according to the flow direction of the reaction materials; the hydrocracking reaction effluent is separated and fractionated to obtain heavy naphtha Hydrocracking products including tail oil. The method of the invention can reduce the over-hydrogenation and over-cracking of the heavy naphtha while ensuring the hydrocracking effect of the heavy component, and reduce the chemical hydrogen consumption, thereby improving the aroma potential and selectivity of the heavy naphtha.

Description

technical field

[0001] The invention relates to a hydrocarbon hydrogenation treatment method, in particular to a heavy distillate oil hydrocracking method. Background technique

[0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad.

[0003] The hydrocracking process includes two processes of cracking and hydrogenation. On the one hand, heavy crude oil is cracked and converted into light distillat...

Examples

Embodiment 1-3

[0035] Embodiment 1-3 adopts such as figure 1 process shown.

[0036] Embodiment 1-3 In the hydrocracking reactor, three kinds of cracking catalysts of catalyst A, catalyst B and catalyst C in Table 1 are graded and loaded respectively according to the order of the catalyst bed from top to bottom. In the three examples, catalyst A The ratios of Catalyst B and Catalyst C are 1:1:1; 1:2:1 and 1:1:2, respectively. The composition and properties of the catalyst are shown in Table 1, the properties of the raw materials used are shown in Table 2, and the reaction conditions and reaction results of Examples 1-3 are shown in Table 3 and Table 4 below.

Embodiment 4

[0038] use figure 2 Process flow shown. Feedstock oil, and catalyst used are the same as embodiment 3. Among them, a gas extraction pipeline is set between two cracking catalyst beds, such as figure 1 shown. Others are the same as embodiment 3. The amount of gas phase material drawn from the gas phase extraction pipeline is 30% of the amount of circulating hydrogen.

[0039] Table 1 Composition and main properties of cracking catalysts.

[0040] project Catalyst A Catalyst B Catalyst C Chemical composition, mass% NiO 8 5 3 WO 3 24 20 18 carrier Aluminum oxide Aluminum oxide Aluminum oxide cracking components Y molecular sieve Y molecular sieve Y molecular sieve Content, m% 65 50 40 Cracking catalyst average pore size, nm 5.0 7.0 9.0

[0041] Table 2 Raw oil properties.

[0042] Raw oil Raw oil Density, g / cm 3 0.9024 Distillation range, ℃ 321～528 C, m% 86....

technical field

[0001] The invention relates to a hydrocarbon hydrogenation treatment method, in particular to a heavy distillate oil hydrocracking method. Background technique

[0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad.

[0003] The hydrocracking process includes two processes of cracking and hydrogenation. On the one hand, heavy crude oil is cracked and converted into light distillat...

Examples

Embodiment 1-3

[0035] Embodiment 1-3 adopts such as figure 1 process shown.

[0036] Embodiment 1-3 In the hydrocracking reactor, three kinds of cracking catalysts of catalyst A, catalyst B and catalyst C in Table 1 are graded and loaded respectively according to the order of the catalyst bed from top to bottom. In the three examples, catalyst A The ratios of Catalyst B and Catalyst C are 1:1:1; 1:2:1 and 1:1:2, respectively. The composition and properties of the catalyst are shown in Table 1, the properties of the raw materials used are shown in Table 2, and the reaction conditions and reaction results of Examples 1-3 are shown in Table 3 and Table 4 below.

Embodiment 4

[0038] use figure 2 Process flow shown. Feedstock oil, and catalyst used are the same as embodiment 3. Among them, a gas extraction pipeline is set between two cracking catalyst beds, such as figure 1 shown. Others are the same as embodiment 3. The amount of gas phase material drawn from the gas phase extraction pipeline is 30% of the amount of circulating hydrogen.

[0039] Table 1 Composition and main properties of cracking catalysts.

[0040] project Catalyst A Catalyst B Catalyst C Chemical composition, mass% NiO 8 5 3 WO 3 24 20 18 carrier Aluminum oxide Aluminum oxide Aluminum oxide cracking components Y molecular sieve Y molecular sieve Y molecular sieve Content, m% 65 50 40 Cracking catalyst average pore size, nm 5.0 7.0 9.0

[0041] Table 2 Raw oil properties.

[0042] Raw oil Raw oil Density, g / cm 3 0.9024 Distillation range, ℃ 321～528 C, m% 86....

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