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Direct liquefaction process of coal by replacing circling solvent with petroleum or petroleum refining byproduct

A technology for direct coal liquefaction and petroleum refining, which is applied in the petroleum industry and the preparation of liquid hydrocarbon mixtures. It can solve the problems of deposition and coking, and increase the severity of petroleum processing, so as to improve the yield, prevent lightening, The effect of improving performance

Active Publication Date: 2008-12-31
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, some low-quality petroleum and its heavy oil with high metal content and high asphaltene content, because they contain more metals and asphaltene, are prone to obvious deposition and coking tendency during conventional processing. The service life and product quality are affected to varying degrees, which increases the harshness of the petroleum processing process

Method used

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  • Direct liquefaction process of coal by replacing circling solvent with petroleum or petroleum refining byproduct
  • Direct liquefaction process of coal by replacing circling solvent with petroleum or petroleum refining byproduct
  • Direct liquefaction process of coal by replacing circling solvent with petroleum or petroleum refining byproduct

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2 and comparative example 1

[0032] In this embodiment, bituminous coal is used as raw coal for coal liquefaction, and the properties of this kind of bituminous coal are shown in Table 1. In Table 1, daf refers to anhydrous ash free (daf, dry and ash free), the same below. The oil slurry dumped from the catalytic cracking unit of a petrochemical refinery is used as an additional solvent to replace the circulating solvent for direct coal liquefaction. The properties of the dumped oil slurry are shown in Table 2. The catalyst synthesized and prepared according to the method in the patent ZL03153377.9 "A Highly Dispersed Iron-Based Coal Direct Liquefaction Catalyst and Its Preparation Method" was selected, and its properties are shown in Table 3. A commercially available Ni-Mo based hydrotreating catalyst was used as the primary hydrogenation catalyst for liquefied product oil (IBP-530°C).

[0033] Table 1 Analysis data of bituminous coal quality

[0034]

[0035]

[0036] Table 2 Properties of FCC S...

Embodiment 3

[0058] The coal type, high-activity catalyst for direct coal liquefaction, co-catalyst, hydrogenation catalyst, and process used in this example are the same as those in Example 1, except that the used alternative direct coal liquefaction circulating solvent is high metal content, high pitch A heavy oil with a low quality content. The properties of the heavy oil used are shown in Table 8.

[0059] Table 9 shows the test results of the bituminous coal direct liquefaction continuous plant when adopting the method of the present invention and adding 10% of this heavy oil to replace the circulating solvent. The yield data in the table is calculated based on daf base coal + heavy oil.

[0060] Table 8 Properties of a heavy oil

[0061] project

[0062] Density (20℃), kg / m 3

[0063] Table 9

[0064] Process conditions

[0065] The data of table 9 is compared with the data of table 7, as can be known: when the ratio of heavy oil substitute solvent...

Embodiment 4

[0067] The coal type, high-activity catalyst for direct coal liquefaction, co-catalyst, hydrogenation catalyst and process used in this embodiment are the same as those in Example 1, except that the petroleum or petroleum refining process used instead of the circulating solvent for direct coal liquefaction The low value-added by-product is a kind of extracted aromatics after hydrotreatment, and its properties are shown in Table 10.

[0068] Table 11 shows the test results of the bituminous coal direct liquefaction continuous plant when the method of the present invention is adopted and 55% of the extracted aromatics after hydrotreating are used to replace the circulating solvent. The yield data in the table is calculated based on daf coal + extracted aromatics.

[0069] Table 10

[0070]

[0071] Table 11

[0072] Process conditions

[0073] Comparing the data in Table 11 with the data in Table 7, it can be seen that: when the ratio of the extracted aromatics su...

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Abstract

The invention relates to a coal direct liquefaction method using petroleum or petroleum refining byproducts to replace a cycling solvent, which comprises processes of: replacing or partially replacing the traditional coal liquefied cycling solvent by low quality petroleum with high metal and asphaltene content and heavy oil, as well as petroleum refining byproducts such as catalytic cracking heavy recycle stock, clarified oil and outside throwing slurry oil, preparing coal slurry by co-catalyst sulfur and high-activity Gamma-hydrated iron oxide type liquefaction catalyst, then implementing the coal direct liquefaction and hydrogenation, finally obtaining light and medium distillate oil, the coal conversion is increased by 1 percent to 5 percent, the yield of generated oil products is increased by 5 percent to 40 percent, the sedimentation and coking in a reactor are reduced, also the utilization value of low value-added petroleum and petroleum refining byproducts is greatly increased, and economic benefits of coal direct liquefaction are increased. The method can be widely used for coal direct liquefaction.

Description

technical field [0001] The invention relates to the field of direct liquefaction of coal, in particular to a method for direct liquefaction of coal in which a circulating solvent is replaced by petroleum or petroleum refining by-products. technical background [0002] Coal is the most abundant solid mineral fuel in the world. It is widely distributed, has a large reserve, and can be mined in large quantities. However, coal has always been used as fuel in the form of solid raw coal, and it is rarely processed and refined. This is because the chemical structure of coal itself is extremely Complex, the molecules in coal are composed of monocyclic, bicyclic, tricyclic and other ring-shaped aromatic hydrocarbons, especially macromolecules of fused-ring aromatic hydrocarbons or heterocyclic aromatic hydrocarbons. This kind of ring-shaped macromolecules has a stable structure and is difficult to crack and liquefy. 5336395 discloses a method of coal liquefaction, which is carried ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00
Inventor 李克健李文博朱晓苏张晓静赵鹏史士东何平王雨杜淑凤高振楠胡发亭谷小会李培霖
Owner CCTEG CHINA COAL RES INST
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