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Method for removing sulfur in petroleum coke and desulfurizer thereof

A petroleum coke and removal technology, applied in the fields of metallurgy, chemical industry, environmental protection, and materials, can solve the problems of increased voltage drop, high thermal brittleness of carbon anode, and ecological environmental pollution, etc., and achieves mild desulfurization conditions, low raw material costs, and high process efficiency. short process effect

Inactive Publication Date: 2011-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These S not only affect the production of carbon products, but also affect the stability of production and the cost of use in downstream industries, and pose a serious threat to the environment
Taking the production of carbon anodes for aluminum as an example, the carbon anode prepared by using high S coke has high thermal brittleness, which leads to a decrease in the thermal stability of the anode and is easy to crack; S in the high S anode will also react with the anode steel claw to form iron sulfide film, increasing the voltage drop, thereby increasing the power consumption of aluminum electrolysis; in addition, the S in the anode is converted to SO in the process of electrolysis with the consumption of the carbon anode 2 form precipitation, causing serious pollution to the surrounding ecological environment

Method used

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  • Method for removing sulfur in petroleum coke and desulfurizer thereof
  • Method for removing sulfur in petroleum coke and desulfurizer thereof
  • Method for removing sulfur in petroleum coke and desulfurizer thereof

Examples

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Effect test

Embodiment 1

[0028] Take 2g of raw petroleum coke with a sulfur content of 3.4% from a domestic aluminum plant, crush it to below 150 mesh, mix hydrochloric acid and nitric acid into a mixed acid according to a ratio of 1, and then combine the mixed acid and petroleum coke with a liquid-solid ratio of 30ml / g. The reactor is fully mixed and uniform, and the system is placed in a constant temperature water bath to control the reaction temperature at 60°C, and the reaction is continued for 24 hours under normal pressure. Then the reactant is vacuum filtered to recover the desulfurization liquid. The filter cake is washed with deionized water for about 5 minutes, and then vacuum filtered with a suction filter. The filter cake after suction is placed in a vacuum drying oven and dried at 90°C for 24 hours to obtain desulfurized coke. The total sulfur content of petroleum coke after desulfurization was measured by microcoulometric titration, and the desulfurization rate reached 64.6%.

Embodiment 2

[0030] Take 2g of raw petroleum coke with a sulfur content of 5.6% from a domestic aluminum plant, crush it to below 150 mesh, mix hydrochloric acid and nitric acid according to a ratio of 0.5 to make a mixed acid, and then combine the mixed acid and petroleum coke with a liquid-solid ratio of 20ml / g. The reactor is fully mixed and uniform, and the system is placed in a constant temperature water bath to control the reaction temperature at 50° C., and the reaction is continued for 24 hours under normal pressure. Then the reactant is vacuum filtered to recover the desulfurization liquid. The filter cake is washed with deionized water for about 5 minutes, and then vacuum filtered with a suction filter. The filter cake after suction is put into a vacuum drying oven and dried at 100°C for 20 hours to obtain desulfurized coke. The total sulfur content of petroleum coke after desulfurization was measured by microcoulometric titration, and the desulfurization rate reached 50.4%.

Embodiment 3

[0032] Take 2g of raw petroleum coke with a sulfur content of 7.6% from a domestic aluminum factory, crush it to below 150 mesh, mix hydrochloric acid and nitric acid into a mixed acid according to the ratio of 1.5, and then mix the mixed acid and petroleum coke according to the liquid-solid ratio of 40ml / g. The reactor is fully mixed and uniform, and the system is placed in a constant temperature water bath to control the reaction temperature at 40° C., and the reaction is continued for 24 hours under normal pressure. Then the reactant is vacuum filtered to recover the desulfurization liquid. The filter cake is washed with deionized water for about 5 minutes, and then vacuum filtered with a suction filter. The filter cake after suction is put into a vacuum drying oven and dried at 100°C for 20 hours to obtain desulfurized coke. The total sulfur content of petroleum coke after desulfurization was measured by microcoulometric titration, and the desulfurization rate reached 55.3%...

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Abstract

The invention relates to a method for removing sulfur in petroleum coke and a desulfurizer thereof. The method adopts two types of mixed acid with a fixed ratio controlled as the desulfurizer, and comprises the following steps: placing fine petroleum coke with a high S content (the S content being 3-7 percent) in the mixed acid under the atmospheric pressure and the temperature of 0-60 DEG C, soaking the petroleum coke for reaction for a certain time, separating the petroleum coke and the soaking solution, washing and drying. The desulfurization percent of the obtained petroleum coke is 45-60percent, the microstructure of the petroleum coke is not changed obviously, and the separated soaking solution of mixed acid can be repeatedly used when being mixed with the newly prepared liquid. The method has the advantages of low desulfurization cost, simple operation and significant desulfurization effect.

Description

Technical field [0001] The invention relates to a chemical desulfurization method of petroleum coke and a desulfurization agent thereof. The method belongs to the technical fields of metallurgy, materials, chemical industry and environmental protection. Background technique [0002] Petroleum coke is one of the main by-products of petroleum deep processing, and it is also an important raw material for metallurgy, chemical industry and the preparation of inorganic materials. According to the different sulfur content, petroleum coke is divided into high-sulfur coke (S≥3%) and low-sulfur coke (S≤3%). Among them, high-sulfur coke is mainly used as fuel, and low-sulfur coke is mainly used in the production of carbon products such as the production of pre-baked anodes and graphite electrodes for aluminum and steelmaking furnaces. In our country, because the S content in crude oil is generally low, the S content of petroleum coke produced is correspondingly low. With the development o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C10L9/06
Inventor 肖劲邓松云杨思蔚赖延清李劼
Owner CENT SOUTH UNIV
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