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A kind of reverse hydrocracking process of whole distillate fraction of coal tar

A hydrocracking and full distillate technology, applied in the coal chemical industry, can solve the problems of excessive sulfur content in light distillates, and achieve the effects of ensuring normal operation, increasing economic value, improving adaptability and production flexibility

Active Publication Date: 2016-05-18
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problem that the sulfur content in the light distillate exceeds the standard in the coal tar hydrogenation process in the prior art, and further provides a light distillate with high utilization rate of coal tar, good operation stability of the hydrogenation device and a Coal tar hydrogenation process meeting clean fuel standards

Method used

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  • A kind of reverse hydrocracking process of whole distillate fraction of coal tar
  • A kind of reverse hydrocracking process of whole distillate fraction of coal tar
  • A kind of reverse hydrocracking process of whole distillate fraction of coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The coal tar full-fraction trans-hydrogenation system that realizes the coal tar full-fraction trans-hydrocracking process in this embodiment includes:

[0047] Connect the pre-hydrogenation protection reactor 3 and the hydrofinishing reactor 4;

[0048] A hot high-pressure separator 5 is connected to the outlet of the hydrotreating reactor 4;

[0049] The cold high-pressure separator 6 is connected with the gas phase outlet of the hot high-pressure separator 5;

[0050] The hot low-pressure separator 7 is connected with the liquid phase outlet of the hot high-pressure separator 5;

[0051] A cold low-pressure separator 8 is connected to the liquid phase outlet of the cold high-pressure separator 6 and the gas phase outlet of the hot low-pressure separator 7;

[0052] Fractionation column 9 is connected with the liquid phase outlet of said cold low-pressure separator 8;

[0053] The hydrocracking reactor 11 is connected with the liquid phase outlet of the hot low-pre...

Embodiment 2

[0063] The coal tar full-fraction trans-hydrogenation system that realizes the coal tar full-fraction trans-hydrocracking process in this embodiment includes:

[0064] The booster pump 1 and the heat exchanger 2 provided in communication;

[0065] Connecting the pre-hydrogenation protection reactor 3 and the hydrofinishing reactor 4 provided, the raw material inlet of the pre-hydrogenation protection reactor 3 is connected with the material outlet of the heat exchanger 2;

[0066] A hot high-pressure separator 5 is connected to the outlet of the hydrotreating reactor 4;

[0067] The cold high pressure separator 6 is connected with the gas phase outlet of the hot high pressure separator 5, and the gas phase outlet of the cold high pressure separator 6 is connected with a circulating hydrogen compressor 13, and the compressed gas outlet of the circulating hydrogen compressor 13 is respectively communicated with the hydrogen inlets of the pre-hydrogenation protection reactor 3, ...

Embodiment 3

[0081] The coal tar full-fraction trans-hydrogenation system that realizes the coal tar full-fraction trans-hydrocracking process in this embodiment includes:

[0082] Connect the pre-hydrogenation protection reactor 3 and the hydrofinishing reactor 4;

[0083] A hot high-pressure separator 5 is connected to the outlet of the hydrotreating reactor 4;

[0084] The cold high-pressure separator 6 is connected with the gas phase outlet of the hot high-pressure separator 5;

[0085] The hot low-pressure separator 7 is connected to the liquid phase outlet of the hot high-pressure separator 5, and the liquid phase outlet of the hot low-pressure separator 7 is connected to the raw material inlet pipe of the pre-hydrogenation protection reactor 3;

[0086] A cold low-pressure separator 8 is connected to the liquid phase outlet of the cold high-pressure separator 6 and the gas phase outlet of the hot low-pressure separator 7;

[0087] Fractionation column 9 is connected with the liqui...

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Abstract

The invention discloses a trans-hydrocracking process of whole fractions of coal tar. The trans-hydrocracking process comprises the following steps: pretreating whole fractions of coal tar, hydrofining and separating to obtain a cold high-fraction gas, a cold low-fraction gas, hot low-fraction oil and cold low-fraction oil, wherein the cold high-fraction gas is a hydrogen-rich gas which is used as a hydrogen source for a hydrogenation reaction together with new hydrogen after being recycled; fractionally distilling the cold low-fraction oil to obtain a fuel gas, a gasoline fraction, a diesel fraction and tail oil; mixing the tail oil with a part of hot low-fraction oil, hydrocracking, returning hydrocracking products to a hydrofining reactor, and carrying out a purification reaction on the hydrocracking products and the oil generated after pretreatment. The trans-hydrocracking process of the whole fractions of the coal tar, disclosed by the invention, is simple in technological process; hydrogenation equipment is good in operation stability; the utilization rate of the coal tar is high; the content of sulfur and nitrogen in gasoline and diesel oil obtained by hydrogenation is low and satisfies the quality standards of clean fuels.

Description

technical field [0001] The invention relates to a coal tar hydrogenation process, in particular to a process method for producing clean light fuel oil by using the whole fraction of coal tar as a raw material, and belongs to the technical field of coal chemical industry. technical background [0002] With the continuous development of my country's economy, the domestic demand for liquid fuels is increasing day by day, but my country is a country short of oil, less gas, and relatively rich in coal resources. The fuel approach has positive practical implications. Coal tar is a by-product formed in the process of coal coking, gasification and carbonization. At present, coal tar is used as raw material, and appropriate processing schemes are adopted to improve the stability of coal tar and reduce its impurity content, so as to obtain high value-added low Sulfur naphtha and clean fuel oil are a very efficient way to prepare liquid fuels. [0003] Because the composition of coal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
CPCC10G67/00C10G2300/201C10G2300/202C10G2400/02C10G2400/04
Inventor 白建明陈松单小勇苏玉更
Owner HUADIAN HEAVY IND CO LTD
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