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Preprocessing method for coking wax oil used as hydrocracking raw material

A technology for coking wax oil and hydrocracking, which can be used in hydrocarbon oil cracking, petroleum industry, refining with acid-containing liquid, etc., and can solve the problems of poor denitrification selectivity, high operating cost, and low refined oil yield.

Active Publication Date: 2008-03-19
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In China, in order to improve the processing performance of coker wax oil, relevant researchers have done a lot of work, and there are studies on dearomatization and denitrification by solvent washing method, but due to poor denitrification selectivity and low yield of refined oil, it remains to Further research; or use hydrorefining to treat catalytic raw materials, but due to the need for high-pressure hydrogenation, large investment and high operating costs, it is difficult to promote
[0006] None of the above hydrofining and solvent washing methods can remove the coke powder carried by the coker wax oil, and it still cannot be blended and directly sent to the hydrocracking unit

Method used

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  • Preprocessing method for coking wax oil used as hydrocracking raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Daqing coking wax oil (its properties are as shown in Table 1) A from the upstream flow process and adding 2% by 60% nitric acid, 35% glycerol and 5% polyacrylamide synthetic coking wax oil pretreatment agent B first in a static mixer Mixing reaction in 1, mixing enough time and intensity, can also be mixed by mixing tank. The contact temperature is 20-120°C.

[0022] The coker wax oil after the reaction is completed enters the settling tank 2, and the sedimentation adopts natural sedimentation, gravity sedimentation for 120 minutes, and the sedimentation temperature is 60-150° C. to obtain the coker wax oil refined oil D (its properties are shown in Table 1). The macromolecular substances after reaction adsorption settle in the settling tank due to the density difference, and the residue C comes out from the bottom of the settling tank. Due to the poor fluidity of the oil residue, it should be properly insulated at the bottom of the tank or a scraper device should be ...

Embodiment 2

[0028] Liaohe coking wax oil (its properties are as shown in Table 2) is mixed with the pretreatment agent synthesized by 80% phosphorous acid or phosphorous acid anhydride, 16% ethylene glycol and 4% polyaluminum chloride, and the pretreatment agent add-on is 5%, Fully mixed by a static mixer, after settling in a settling tank for 60 minutes, refined coker wax oil (its properties are shown in Table 2) was obtained. The test results of hydrocracking pre-refining show that, compared with untreated coker gas oil, when the total nitrogen content reaches 10 μg·g -1 , the airspeed increases by 35%.

[0029] Table 2 Properties of coker wax oil before and after pretreatment

[0030] analyze data

Embodiment 3

[0032] Daqing coking wax oil (its properties are shown in Table 3) is mixed with a pretreatment agent synthesized by 50% sulfuric acid, 42% DMF and 8% sodium metaaluminate, the addition of the pretreatment agent is 0.5%, and it is fully mixed by a static mixer Afterwards, settling in the settling tank for 30 minutes separated coker wax oil refined oil (its properties are as shown in Table 3). The test results of hydrocracking pre-refining show that, compared with untreated coker gas oil, when the total nitrogen content reaches 10 μg·g -1 , the temperature of the hydrocracking pre-refining section is 10°C lower.

[0033] Table 3 Properties of coker wax oil before and after pretreatment

[0034] analyze data

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Abstract

The invention relates to a pretreatment method for hydrocracking raw material to improve the processing property of coker gas oil to be equivalent with straight-run refining wax oil through remove polar impurities, such as coke powder, colloid, heterocyclic benzenoid, and basic nitrogen compound, from coker gas oil, which includes the following steps: the pretreatment agent and the coker gas oil are mixed under 20-120 DEG C according to 0.1-10 percent by weight proportion; the pretreatment agent includes 49-89 percent of active components, such as hydrochloric acid, nitric acid, perchloric acid, sulfuric acid, phosphorous acid or phosphorous anhydride; 10-50 percent of cosolvents, such as ferric chloride, glycerol, ethylene glycol or DMF; and 0.1-10 percent one or more of polyacrylamide, polyaluminium chloride, polymeric aluminum ferric chloride, sodium meta-aluminate, sodium sulfate, sulfuric acidaluminum, aluminum potassium sulfate, and sodium silicate; the mixed materials are gravity settled in a settling tank, the sedimentation temperature is 60-150 DEG C, and the time is 30-120min, refined coker gas oil can be directly blended into hydrocracking device to decrease the initial temperature of hydrocracking prerefining section by more than 10 DEG C or improve the device processing capacity by more than 30 percent.

Description

technical field [0001] The invention relates to a method for removing coke powder, colloid, heterocyclic aromatic hydrocarbons, basic nitrides and other polar impurities unfavorable for hydrocracking from coking wax oil, improving the processing performance of coking wax oil and making it comparable to straight Distilled wax oil equivalent to coker wax oil is used as a pretreatment method for hydrocracking raw materials. Background technique [0002] Deep processing of crude oil is the development trend of the oil refining industry. Catalytic cracking and delayed coking are commonly used methods for deep processing of crude oil. The coker wax oil made of vacuum residue and catalytic oil slurry cannot be directly used as a raw material for catalytic cracking due to its poor processability, but can only be used as a catalytic raw material after being blended with straight-run wax oil in a certain proportion. [0003] Coking gas oil has the characteristics of high sulfur and ...

Claims

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Application Information

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IPC IPC(8): C10G17/07C10G47/00
Inventor 郭立艳许乐新张浩靳国民田然张国静周奇宝高明杨世成缪春祥许意成黄宝岩王国清王君周鸿殷北冰
Owner PETROCHINA CO LTD
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