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Hydrocracking method

A hydrocracking and hydrorefining technology, applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve the problems of poor hydrogenation selectivity, difficult to take into account the quality of reformate and tail oil products, etc. Improve cracking rate, avoid further cracking, reduce the effect of excessive hydrogenation

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the conventional catalyst loading method used in the cracking section of this invention, the hydrogenation selectivity of tail oil and heavy naphtha components is poor, so it is difficult to take into account the product quality of reformate and tail oil

Method used

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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% ...

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Abstract

The present invention discloses a hydrocracking method. According to the method, heavy distillate oil and hydrogen gas are mixed and then enter a hydrorefining reactor to carry out a hydrorefining reaction; the hydrorefining reaction effluent directly enters a hydrocracking reactor and is subjected to a contact reaction with grading catalyst bed layers in the hydrocracking reactor, wherein at least two cracking catalyst bed layers are arranged inside the hydrocracking reactor, and the hydrogenation activity of the hydrocracking catalyst presents the decrease tendency according to the reaction material flowing direction; and the hydrocracking reaction effluent is subjected to separation and fractionation to obtain the hydrocracking products including heavy naphtha and tail oil. With the method of the present invention, the heavy component hydrocracking effect can be ensured while the excessive hydrogenation and the excessive cracking of the heavy naphtha are reduced, and the chemical hydrogen consumption is reduced, such that the aromatic potential and the selectivity of the heavy naphtha are increased.

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...

Claims

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Application Information

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IPC IPC(8): C10G67/02
CPCC10G67/02
Inventor 柳伟杜艳泽王凤来刘昶秦波张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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