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Method for treating exhaust gas in process of producing crude phenol from coal tar

A technology for waste gas treatment and coal tar, applied in separation methods, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as environmental pollution, increase NaOH consumption, and increase production costs, and achieve the effect of reducing production costs.

Active Publication Date: 2010-02-10
山西宏特煤化工有限公司
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Problems solved by technology

[0006] According to the traditional chemical production process, domestic tar processing plants use NaOH or other alkaline neutralizers to absorb harmful acidic substances (acid mist and phenolic substances) in the exhaust gas, but this treatment will produce new waste liquid containing sodium sulfate. At the same time increase the consumption of NaOH and increase the production cost
[0007] And some tar processing plants do not even do any treatment and directly discharge into the atmosphere, causing environmental pollution

Method used

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  • Method for treating exhaust gas in process of producing crude phenol from coal tar
  • Method for treating exhaust gas in process of producing crude phenol from coal tar
  • Method for treating exhaust gas in process of producing crude phenol from coal tar

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[0037] The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings. But it is not limited to these embodiments, and there may be other embodiments with more changes or improvements without departing from the basic concept of the present invention.

[0038] figure 1 Shown is a schematic flow chart of the traditional sulfuric acid process for producing crude phenol from coal tar.

[0039] Phenols are one of the main chemical products extracted from coal tar. The net phenolic sodium salt produced in the tar workshop of the coking plant is an intermediate product for the production of crude phenol obtained after the phenolic distillate oil is washed with alkali, and the crude phenolic sodium salt obtained is then subjected to steam blowing. These intermediate products net phenolic sodium salt are delivered to net phenolic sodium salt tank.

[0040] The traditional process of producing crude phenol generally ...

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Abstract

A method for treating exhaust gas in the process of producing crude phenol from coal tar is to absorb waste gas containing acid fog, which is generated in the process of decomposing net phenol sodiumsalt by sulfuric acid process in an absorption tower by using intermediate product of net phenol sodium salt generated from phenol fraction obtained from distilling and washing coal tar by NaOH watersolution in the process of producing crude phenol from coal tar. Exhausted offgas treated by using the method conforms to national secondary standard; in addition, the method uses intermediate productof net phenol sodium salt in the production process as absorbent other than alkaline absorbent, thus protecting environment and lowering production cost.

Description

technical field [0001] The invention relates to a coal tar processing method, in particular to a sulfuric acid method for producing crude phenol from coal tar and a waste gas treatment method. Background technique [0002] The extraction of phenolic substances in coal tar is generally carried out by washing and separating the phenols in the fractions with NaOH aqueous solution in the phenol oil and naphthalene oil fractions or the mixed fractions of phenol, naphthalene, and washing oil in which phenols are relatively concentrated. Phenol sodium salt (this process is also called washing process), and then by using sulfuric acid to decompose the net phenol sodium salt to obtain crude phenol (this process is also called decomposition process). However, the industrial waste gas produced when decomposing pure sodium phenate with sulfuric acid method contains acid mist (sulfuric acid droplets) and phenolic substances, if discharged into the atmosphere, it will pollute the environm...

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Application Information

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IPC IPC(8): B01D53/14C07C39/04C07C37/055
Inventor 吴连生李玉财聂矿新何云王华新于强宋晓霞温志杰刘效清于志义叶裕章
Owner 山西宏特煤化工有限公司
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