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A kind of method of catalytic degradation hexachlorobenzene

A technology of catalytic degradation and hexachlorobenzene, applied in chemical instruments and methods, ammonium halide, organic chemistry, etc., can solve the problems of difficult mass production, low solubility, no method, etc., and achieve the effect of large processing capacity and high catalytic activity

Active Publication Date: 2016-02-03
XIAN CATALYST NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexachlorobenzene has a completely symmetrical structure, and has a large number of chlorine substitutions, high toxicity, and very difficult to degrade
According to the survey, at least 600 tons of hexachlorobenzene are produced in the domestic chemical production process every year, and the sealed hexachlorobenzene waste has the risk of leakage and diffusion, which poses a huge hidden danger to the safety of the surrounding ecological environment
Hexachlorobenzene is usually disposed of by simple incineration, which may produce dioxins during the incineration process, causing great harm to the environment
[0004] Dong Yuhuan and others prepared a new type of double-loaded bimetallic catalyst: PVP-PdCl2-MnXm / MontK10-PEG400, which uses the hydrogen transfer method to catalyze the dechlorination of hexachlorobenzene in the aqueous phase. The reaction conditions are mild and can make The conversion rate of hexachlorobenzene reaches 100%, but the catalyst preparation is too complicated, it is difficult to produce in large quantities, it is difficult to separate after the reaction, it is difficult to recover precious metals, and the reaction time is relatively long. The disposal amount of hexachlorobenzene is also less
[0005] Xiao Yong and others discussed the research progress of hexachlorobenzene degradation and removal methods in recent years. Scholars at home and abroad mainly carried out research on the degradation of hexachlorobenzene through the following methods, such as: photocatalytic oxidation, microbial degradation, irradiation method, Electrochemical method and catalytic hydrogenation method, these methods have a certain effect on the degradation of hexachlorobenzene, but most methods are still in the laboratory and theoretical research stage, due to various reasons and difficulties, there is no suitable method for practical application. Methods
[0006] Chinese patent 201010281630.2 invented a nickel phosphide catalyst for hydrodechlorination of chlorobenzene compounds, using a fixed bed reactor to achieve continuous dechlorination of chlorobenzene compounds with less than 3 chlorines, after catalyst modification The conversion rate has been improved and better results have been achieved. However, the Ni catalyst has certain insecurity, and the stability of the catalyst remains to be investigated.
In addition, the stability of hexachlorobenzene is high, and the catalyst is not necessarily suitable for the catalytic hydrodechlorination reaction of hexachlorobenzene

Method used

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  • A kind of method of catalytic degradation hexachlorobenzene
  • A kind of method of catalytic degradation hexachlorobenzene
  • A kind of method of catalytic degradation hexachlorobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Active component Pt and auxiliary agent Na on the support; The mass percent composition of active component Pt in the described catalyst is 0.1%, the mass percent composition of auxiliary agent Na is 2.5%; The Al 2 o 3 The carrier is γ-Al 2 o 3 , Al 2 o 3 The particle size of the carrier is 3mm, and the specific surface area is 150m 2 / g.

[0035] The preparation method of catalyst comprises the following steps:

[0036] Step 1, dissolving platinum chloride containing 0.1 g of platinum and sodium chloride containing 2.5 g of sodium in hydrochloric acid with a mass concentration of 5% and mixing uniformly to obtain solution A, adjusting the pH value of solution A to 0.1;

[0037]Step two, the 97.4gAl 2 o 3 The carrier is placed in an aqueous citric acid solution with a mass concentration of 0.01%, and soaked at 50°C for 4 hours;

[0038] Step 3, the soaked Al in step 2 2 o 3 The car...

Embodiment 2

[0041] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 Active component Ru and auxiliary agent Fe on the carrier; the mass percentage of active component in the catalyst is 3%, and the mass percentage of auxiliary agent is 0.01%; the Al 2 o 3 The carrier is γ-Al 2 o 3 , Al 2 o 3 The particle size of the carrier is 0.5mm, and the specific surface area is 280m 2 / g.

[0042] The preparation method of catalyst comprises the following steps:

[0043] Step 1, dissolving ruthenium trichloride containing 3 g of ruthenium and ferric nitrate containing 0.01 g of iron in hydrochloric acid with a mass concentration of 10% and mixing uniformly to obtain solution A, and adjusting the pH value of solution A to 2.0;

[0044] Step two, 96.99gAl 2 o 3 The carrier is placed in an aqueous sodium citrate solution with a mass concentration of 10%, and soaked at 98°C for 0.5h;

[0045] Step 3, the soaked Al in step 2 2 o 3 The carrier was taken out and plac...

Embodiment 3

[0048] The catalyst of this example includes Al 2 o 3 Carrier, loaded on Al 2 o 3 The active component Ag and auxiliary agent Mg on the support; The mass percent composition of active ingredient in the described catalyst is 0.3%, the mass percent composition of auxiliary agent is 0.05%; The Al 2 o 3 The carrier is γ-Al 2 o 3 , Al 2 o 3 The particle size of the carrier is 1mm, and the specific surface area is 200m 2 / g.

[0049] The preparation method of catalyst comprises the following steps:

[0050] Step 1, dissolving silver chloride containing 0.3g of silver and magnesium carbonate containing 0.05g of magnesium in sulfuric acid with a mass concentration of 10% and mixing uniformly to obtain solution A, adjusting the pH value of solution A to 3.0;

[0051] Step two, 99.65gAl 2 o 3 The carrier is placed in an aqueous sodium hydroxide solution with a mass concentration of 5%, and soaked at 90°C for 1 hour;

[0052] Step 3, the soaked Al in step 2 2 o 3 The carri...

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Abstract

The invention discloses a method for catalytic degradation of hexachlorobenzene. The method comprises the following steps: firstly, filling a catalyst into a fixed bed reactor, and carrying out reduction treatment on the catalyst; secondly, mixing hexachlorobenzene steam and preheated hydrogen uniformly to obtain a mixed gas, introducing the mixed gas into the fixed bed reactor after reduction treatment, and carrying out catalytic hydrodechlorination reaction on the catalyst, thereby obtaining the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen; and thirdly, feeding the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen into a condenser for condensing, converting benzene into liquid, then feeding the hydrogen chloride gas and unreacted hydrogen in the mixed gas into an absorption tower for absorbing hydrogen chloride by ammonia water, compressing the unreacted hydrogen by a compressor, and returning for recycling. A solvent is not required to be added in catalytic hydrogenation and degradation of hexachlorobenzene by the method provided by the invention, benzene and ammonium chloride are produced as byproducts, and zero emission of pollutants can be reached, and the method is an environmental-friendly technology for degrading hexachlorobenzene efficiently.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation, and in particular relates to a method for catalytically degrading hexachlorobenzene. Background technique [0002] Aromatic chlorides are widely used in industry, but they are toxic substances that endanger human health. Due to their high structural stability, they are difficult to degrade in nature. Therefore, researchers from all over the world are working hard to explore halogen-containing organic pollutants. efficient detoxification method. [0003] HCB is one of 12 persistent organic pollutants (POPs). Hexachlorobenzene has a completely symmetrical structure, and has many chlorine substitutions, high toxicity, and very difficult to degrade. According to the survey, at least 600 tons of hexachlorobenzene are produced in the domestic chemical production process every year, and the sealed hexachlorobenzene waste has the risk of leakage and diffusion, which poses a huge hidden ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/02C01C1/16C07C1/26C07C15/04
Inventor 张之翔王树华林涛周强万克柔程杰杨仲苗吴奕文永忠王鹏宝
Owner XIAN CATALYST NEW MATERIALS CO LTD