Process for improving cetane number of diesel oil and reducing aromatic hydrocarbon of diesel oil simultaneously

A technology of cetane number and diesel oil, which is applied in the field of increasing the cetane number of diesel oil while reducing its aromatics, and can solve problems such as difficult operation, difficult realization, and complicated components

Inactive Publication Date: 2006-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce ultra-low aromatics diesel, but the second step of the method adopts a reverse flow process, the internal components of the reactor are complicated, the operation is difficult, and there are many difficulties in industrial implementation

Method used

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  • Process for improving cetane number of diesel oil and reducing aromatic hydrocarbon of diesel oil simultaneously

Examples

Experimental program
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Effect test

preparation example Construction

[0022] The preparation method of this catalyst is as follows:

[0023] First, the mesoporous silica-alumina carrier is shaped, the shaped carrier is dried at 80-140°C for 2-10 hours, and then calcined at 400-650°C for 2-10 hours. The platinum and palladium solutions used are platinum, palladium chloride, chlorate or ammonium salt. Immerse for 1 to 8 hours using the saturated immersion method, then dry at 80°C to 140°C for 2 to 10 hours, and bake at 400 to 650°C for 2 to 10 hours. The content of precious metals platinum and palladium is 0.1-10% by weight, and the weight ratio of platinum and palladium is 0.1-10:1.

[0024] The hydrodearomatization catalyst has excellent aromatics hydrogenation activity, anti-sulfur and nitrogen poisoning performance and low cracking performance, and can avoid the splitting of diesel oil fractions into small molecular by-products.

[0025] The method provided by the present invention will be further described below with reference to the accomp...

Embodiment 1

[0041] The raw material of this example is catalytic cracking diesel A, and the properties of this raw material are shown in Table 2.

[0042] The raw material is first contacted with hydrogen and hydrogenation-upgrading catalyst RIC-1 in the first-stage hydrogenation-upgrading reactor. The hydrogen partial pressure is 6.4MPa, the temperature is 360℃, and the hydrogen-oil volume ratio is 600Nm 3 / m 3 , liquid hourly space velocity 1.3h -1 The effluent of the first-stage hydro-upgrading reactor directly enters the hot high-pressure separator. The bottom of the hot high fraction is fed with hydrogen or hydrogen-rich gas for stripping to remove impurities such as hydrogen sulfide and ammonia in the first-stage reactant stream. The hot high-fraction stripping gas is cooled in two steps to obtain diesel fraction and part of the naphtha generated by cracking in the first stage. The diesel fraction is sent to the second-stage hydrodearomatization reactor as cold oil, and the naphth...

Embodiment 2

[0045] The raw material of this example is catalytic cracking diesel B, and the properties of this raw material are shown in Table 2.

[0046] The raw material is first contacted with hydrogen and the hydrogenation-upgrading catalyst RIC-1 in the first-stage hydrogenation-upgrading reactor. 3 / m 3 , liquid hourly space velocity 1.5h -1 The effluent of the first-stage hydro-upgrading reactor directly enters the hot high-pressure separator. The bottom of the hot high fraction is fed with hydrogen or hydrogen-rich gas for stripping to remove impurities such as hydrogen sulfide and ammonia in the first-stage reactant stream. The hot high-fraction stripping gas is cooled in two steps to obtain diesel fraction and part of the naphtha generated by cracking in the first stage. The diesel fraction is sent to the second-stage hydrodearomatization reactor as cold oil, and the naphtha directly enters the fractional distillation. system. The hydrogen separated from the stripping gas is...

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Abstract

The invention provides a process for improving cetane number of diesel oil and reducing aromatic hydrocarbon of diesel oil simultaneously which comprises, charging the diesel raw material and hydrogen gas into a first reactor, contacting non-noble metal hydrogenation catalyst, charging the reaction effluent from the first reactor into a second reactor, contacting noble metal hydrodealkylation catalyst, isolating the reaction effluent from the second reactor to obtain the diesel product.

Description

technical field [0001] The invention belongs to a method for hydrotreating hydrocarbon oil, more specifically, to a method for increasing the cetane number of diesel fuel and simultaneously reducing its aromatics. Background technique [0002] At present, the demand for high-quality diesel fuel in the domestic and foreign oil markets is growing, and this trend of increasing demand will continue in the foreseeable future. On the other hand, with the increasing pressure on environmental protection, diesel quality has become another hot topic at present, and some new clean diesel specifications have been gradually introduced by the specification establishment. In addition to stricter restrictions on the sulfur content in diesel fuel, the new specification also imposes further requirements on aromatics content and cetane number. [0003] Aromatic content and cetane number in diesel directly affect the combustion performance of diesel and the formation an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/04
Inventor 胡志海蒋东红石玉林夏国富
Owner CHINA PETROLEUM & CHEM CORP
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