Method and system for treating phenol-containing acidic water by direct liquefaction with coal

An acid water, direct technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, extraction water/sewage treatment, etc., can solve the problem of low ammonia removal rate, achieve simple process flow, social benefits and economical The effect of significant benefits and low cost of equipment construction or renovation

Active Publication Date: 2012-02-15
CHNA ENERGY INVESTMENT CORP LTD +1
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Problems solved by technology

The shortcoming of this scheme one is, in order to meet the requirement of follow-up solvent extraction phenol process, the removal rate of ammonia is low in the deamination process of twin-tower stripping; A stripper is required to strip the water to recover small amounts of entrained solvent and to remove ammonia

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  • Method and system for treating phenol-containing acidic water by direct liquefaction with coal
  • Method and system for treating phenol-containing acidic water by direct liquefaction with coal
  • Method and system for treating phenol-containing acidic water by direct liquefaction with coal

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Embodiment Construction

[0028] The method and system for treating phenol-containing acidic water from direct liquefaction of coal provided by the present invention will be further described in detail below, but the present invention is not limited thereto.

[0029] The treatment method for direct coal liquefaction of phenol-containing acidic water provided by the present invention includes four steps of extraction and removal of phenols with an ether extractant, separation of extracts, recovery of ether solvents and hydrogen sulfide removal by stripping, and deep deamination by stripping. The following are detailed one by one as follows:

[0030] Step 1: Extraction and dephenolization

[0031] The purpose of extractive dephenolization is to use ether extractant to extract phenolic organic compounds in the acidic water of coal direct liquefaction. On the one hand, the organic phenols contained in acidic water are recovered as high-value products; on the other hand, after the content of phenolic subst...

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Abstract

The invention relates to a method and system for treating phenol-containing acidic water by direct liquefaction with coal. The method comprises steps as follows: (1) phenol-containing acidic water enters an extraction tower to be in counterflow contact with an ether solvent, the phenol-containing ether solvent flows out of the tower top, and the dephenolized water flows out of the tower bottom; (2) the phenol-containing ether solvent from the extraction tower top enters an extract distillation tower after heat exchange, the ether solvent flowing out of the distillation tower top is cooled forcyclic use, and crude phenols are led out of the tower bottom; (3) the water from the extraction tower bottom enters a hydrogen sulfide stripping tower after heat exchange, ethers and hydrogen sulfide flows out of the tower top, the ethers is cooled for cyclic use, and the acidic gas containing rich hydrogen sulfide enters a sulfur recovery device; and (4) the water extracted from the hydrogen sulfide stripping tower bottom enters an ammonia stripping tower after heat exchange, caustic alkali is added into a liquid phase on the tower bottom, a gas phase containing rich ammonia flows out of the tower top, and purified water flows out of the tower bottom. The purified water obtained by using the invention can be directly used as influent water for biochemical treatment.

Description

technical field [0001] The invention relates to a multistage treatment method for acidic industrial waste water, more specifically, a treatment method for directly liquefying coal to phenol-containing acidic water. Background technique [0002] With the sustained and rapid development of my country's economy, my country's oil consumption has increased year by year, while my country's oil production has only increased slightly, and crude oil imports have increased year by year. At present, my country's dependence on foreign oil has exceeded 50%. A large amount of petroleum depends on imports, which increases the risk of my country's energy supply. [0003] my country's primary energy structure determines that direct coal liquefaction to produce oil is in line with my country's energy sustainable development strategy. The target products of direct coal liquefaction are liquid transportation fuels including light liquefied oil products and heavy liquefied oil products. In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/26
Inventor 吴秀章
Owner CHNA ENERGY INVESTMENT CORP LTD
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