Processing method of middle and low temperature coal tar

A technology of low-temperature coal tar and processing method, which is applied in tar processing, tar processing by distillation, petroleum industry, etc., can solve the problem that there is no water washing process for dephenolized oil, deep dehydration of raw material oil, inability to use raw oil, etc. question

Inactive Publication Date: 2011-04-20
何巨堂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantage of the process of extracting phenol from medium and low temperature coal tar is: the process produces phenol-containing wastewater
[0016] ③Phenol oil alkali washing process usually adopts two-stage countercurrent washing, and the recovery rate of phenol is low;
[0017] ④ There is no water washing process for dephenolized oil, and the amount of alkali metal ions carried in the dephenolized oil is large;
[0018] ⑤The distillation and refining process of dephenolized oil after water washing is not

Method used

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  • Processing method of middle and low temperature coal tar
  • Processing method of middle and low temperature coal tar
  • Processing method of middle and low temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] The by-products of the coal-to-natural gas plant whose properties are shown in Table 5, coal light oil, coal medium oil and coal heavy oil are mixed into mixed coal tar and combined fractionation, the purpose is to simplify the fractionation process and extract low-level phenols in coal heavy oil. The properties of fractionation products are shown in Table 7 and Table 8

[0155] The mixed coal tar enters the main fractionation column TS1 and is separated into overhead oil (mainly composed of components with a conventional boiling point below 170°C), the first side draw oil (mainly composed of components with a conventional boiling point of 165-235°C) and the second The second side draw oil (mainly composed of components with a conventional boiling point of 235-350°C) and tower low oil (mainly composed of components with a conventional boiling point above 350°C); the first side draw oil enters the first side stripping tower (Phenol oil stripping tower) is separated into ...

Embodiment 2

[0175] Compared with Example 1, the operation of the main fractionation tower TS1 is changed, the second side draw oil is mainly composed of components with a conventional boiling point of 235-490°C, and the low cinder oil of the tower is mainly composed of components with a conventional boiling point of above 490°C.

[0176] The coal residue oil at the bottom of the tower enters the coking part to complete the coking process and the coking product recovery process.

[0177] Neutral oil or TS3 bottom liquid DLO or phenol residue can be introduced into the coal residue oil coking process and the corresponding products can be recovered.

Embodiment 3

[0179] Compared with Example 2, the method for processing the phenol residue is that the phenol residue enters the phenol residue fractionation tower TS9, and the phenol residue is separated into a phenol residue low-boiling fraction and a phenol residue raffinate suitable for the raw material oil of the hydrogenation upgrading process; The low-boiling point fraction of slag finally enters the hydro-upgrading process HTP to contact with the hydro-upgrading catalyst.

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Abstract

The invention relates to a processing method of middle and low temperature coal tar. The processing method comprises the following steps: completing countercurrent contact wash and separation at least twice on narrow fraction phenol oil PO and alkali liquid SHW which are obtained by fractionating raw coal tar to obtain a water solution of oil-containing sodium phenolate and dephenolized phenol oil; washing the dephenolized phenol oil with washing water to obtain washed dephenolized phenol oil DPO and oil washing water, wherein at least part of the oil washing water is circulated to be used as the washing water, and the residual oil washing water enters an alkali washing process for the phenol oil; and further, fractionating the washed dephenolized phenol oil to obtain tower bottom residual liquid DLO the yield of which is lower than 5% and refined dephenolized phenol oil, wherein the washed dephenolized phenol oil DPO or the refined dephenolized phenol oil TDPO enters a hydro-upgrading process of the raw coal tar distillate oil, and the tower bottom residual liquid DLO enters a coking unit of raw coal tar residual oil to complete the coking process and recycle the coke products. The processing method provided by the invention has the advantages of reducing the consumption of the alkali liquid, reducing the quantity of alkali metal ions in the dephenolized phenol oil, and the like, integrates the coal tar hydro-upgrading process and the coal residual oil coking process into a combined technique, and is especially suitable for the comprehensive utilization of the middle and low temperature coal tar.

Description

technical field [0001] The invention relates to a method for processing medium and low temperature coal tar, which comprises fractionating medium and low temperature coal tar to obtain narrow-fraction phenol oil, and processing the narrow-fraction phenol oil to obtain crude phenol and dephenolized oil suitable for use as raw material oil in the hydrogenation upgrading process; especially In other words, the present invention relates to a comprehensive processing method of medium and low temperature coal tar, which combines the phenol extraction process, coal tar distillate oil hydrogenation upgrading process and coal tar residue coking process to form a combined process to realize the production of medium and low temperature coal tar full fractions. deep processing. Background technique [0002] As we all know, phenols are one of the main chemical products in coal tar. The composition and yield of phenols in coal tar are related to the composition of coal blending, the prope...

Claims

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Application Information

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IPC IPC(8): C10C1/00C10C1/08C10G67/00C10G69/00C10G55/00
Inventor 何巨堂
Owner 何巨堂
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