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Coal tar pretreatment method

A coal tar and pretreatment technology, which is applied in tar processing, tar processing by distillation, tar extraction by chemical method, etc. It can solve the problems of affecting process economy, high loss rate of coal tar, and low utilization efficiency of equipment, etc. problem, to achieve the effect of improving process selectivity and removal efficiency, improving removal efficiency and improving economy

Inactive Publication Date: 2017-02-15
特思锐能源科技(北京)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of adding diluent oil, the loss rate of heavy components is not considered, resulting in a large loss rate of coal tar, which affects the economics of the process
In the whole pretreatment process, the process of diluting oil extraction is not mentioned, which will lead to lower utilization efficiency of the equipment in the subsequent process and affect the economics of the process
[0007] In short, none of the existing coal tar pretreatment processes can achieve the purpose of clean and efficient removal of impurities in coal tar raw materials, and has the disadvantages of low raw material utilization rate, poor process selectivity, and limited removal effect.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0069] For the above three raw materials, add 20% water and 0.01% demulsifier at 90°C, and after sedimentation and separation, submerged oil 1-3 and supernatant oil 1-3 are obtained, and the yields of supernatant oil are 32%, 18% respectively. % and 21%, after being filtered by a 0.5 micron filter element, its properties are shown in Table 2. The ash content and mechanical impurity content are all lower than the detection limit of the national standard method, and the metal content is 4.5μg / g, 6.9μg / g and 6.4μg / g / g

Embodiment 4

[0071] After underwater oil 1 is mixed with diluted oil (mass ratio 2:1), after filtering through a 0.3 micron filter element, add dilute nitric acid (concentration: 5%) with 20% underwater oil at 75°C, and add 0.03% Metal chelating agent, after being fully stirred for 2 hours, the mixture of underwater oil and diluent oil will be lost under the acid solution after standing still, and the loss rate of underwater oil is 0.8%. After the product on the acid solution was washed with water twice, the diluent oil therein was evaporated, and the content of ash, metal and mechanical impurities in the product was measured, and the results are shown in Table 3.

Embodiment 5

[0073] After underwater oil 2 is mixed with diluent oil (mass ratio 1:1), after filtering through a 0.3 micron filter element, add 20% oxalic acid solution (concentration: 10%) of underwater oil at 65°C, and add 0.05% of Metal chelating agent, after being fully stirred for 2 hours, the mixture of underwater oil and diluent oil will be lost under the acid solution after standing still, and the loss rate of underwater oil is 1.8%. After the product on the acid solution was washed with water three times, the diluent oil therein was distilled off, and the content of ash, metal and mechanical impurities was determined, and the results are shown in Table 3.

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Abstract

The invention discloses a coal tar pretreatment method. The method comprises the following steps: 1, fully mixing a coal tar raw material with water, salt and a de-emulsifier A, and using an oil-water separation device to separate the coal tar raw material at 50-200 DEG C under 0.1-5.0 Mpa into oil above water, water and oil under water, wherein the addition amount of water is 5-50% of the weight of the coal tar raw material, the addition amount of the de-emulsifier A is 0.003-0.05% of the weight of the coal tar raw material, and the addition amount of the salt makes the density of the salt in water reach 1.001-1.015 g / cm<3>; 2, treating the oil above water obtained in step 1 to obtain refined coal tar I; 3, treating the oil under water obtained in the step 1 to obtain standing coal tar II; and 4, mixing the refined coal tar I obtained in step 2 with the standing coal tar II obtained in step 3 to obtain refined coal tar, adding the refined coal tar to a distillation system, separating to obtain a fraction with the boiling point being smaller than 150 DEG C and a fraction with the boiling point being greater than 150 DEG C, and mixing a part of the fraction with the boiling point being smaller than 150 DEG C with the fraction with the boiling point being greater than 150 DEG C to obtain pretreated coal tar.

Description

technical field [0001] The invention belongs to the technical field of coal tar treatment and relates to a coal tar pretreatment method. Background technique [0002] Coal tar is a black or dark brown viscous liquid with pungent odor in appearance, a by-product of coal pyrolysis process, with a density of 1.0g / cm 3 Left and right, it contains a large amount of phenols, aliphatic long-chain alkanes, alkenes, aromatic hydrocarbon alkyl-substituted derivatives and fused ring aromatic hydrocarbons. It can be used as subsequent extraction and separation to provide various chemical raw materials and pharmaceutical intermediates, and can also be used as a raw material for hydrogenation to produce clean diesel with a low freezing point. Medium and low temperature tar mainly comes from the following processes: low-temperature pyrolysis and upgrading of lignite to produce semi-coke; medium-low temperature dry distillation of long-flame coal, non-caking coal and weakly sticky coal to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/00C10C1/04C10C1/20
CPCC10C1/00C10C1/04C10C1/20
Inventor 牛力周旭
Owner 特思锐能源科技(北京)有限责任公司
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