Catalyst for catalyzing incineration of vinyl chloride polymerization moisture-containing tail gas and preparation method thereof

A vinyl chloride polymerization and catalytic incineration technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, combustion methods, etc., to prevent loss, avoid catalyst deactivation by alkali poisoning, and improve anti-poisoning ability

Active Publication Date: 2021-03-02
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is difficult to make a dechlorination catalyst with high catalytic activity, strong anti-poisoning ability, good economical performance and excellent comprehensive performance

Method used

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  • Catalyst for catalyzing incineration of vinyl chloride polymerization moisture-containing tail gas and preparation method thereof
  • Catalyst for catalyzing incineration of vinyl chloride polymerization moisture-containing tail gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of active component doping precursor: take 100g of niobium concentrate, add a concentration of 40wt% hydrofluoric acid solution to dissolve, add a concentration of 40wt% potassium fluoride solution to the reacted solution, and control the niobium concentrate: The mass ratio of hydrofluoric acid: potassium fluoride is 1:3:0.8, and the reaction is carried out at room temperature for 60 minutes to obtain the doping component precursor K 2 [NbOF 5 ] solution.

[0045] (2) Preparation of doping active components: Take 10g active component MnO and dissolve in 300g precursor solution, then add NH 4 OH to control pH = 8, fully stirred for 20 minutes and mixed to obtain the doping active component.

[0046] (3) Preparation and modified carrier: refer to the general method for preparing ATP powder in Example 1 (step 2-3) of patent CN 102794169 B, and sieve out 200-300 mesh ATP powder. Weigh 100g powder and put it into 1L modified solvent (the volume ratio of ea...

Embodiment 2

[0052] (1) Preparation of active component doping precursor: control the mass ratio of refined niobium ore: hydrofluoric acid: potassium fluoride to be 1:3:1, and other conditions are the same as in Example 1.

[0053] (2) Preparation of doping active components: Same as Example 1.

[0054] (3) Preparation and modified carrier: KH-550 was selected as the silane coupling agent, and other conditions were the same as in Example 1.

[0055] (4) load active component: with embodiment 1.

[0056] Catalytic incineration tail gas effect is shown in Table 5 below:

[0057] Table 5 Composition of chlorine-containing tail gas

[0058] Content / Ingredient vinyl chloride water carbon dioxide carbon monoxide Chloromethane Nitrogen Content before treatment (wt) 62％ 1.8％ 15％ 6％ 0.2％ 15％ Content after treatment (wt) 27ppm 2％ 83％ 0 8ppm 15％

Embodiment 3

[0060] (1) Preparation of active component doping precursor: take 100g of niobium concentrate, add a concentration of 40wt% hydrofluoric acid solution to dissolve, add a concentration of 40wt% potassium fluoride solution to the reacted solution, and control the niobium concentrate: The mass ratio of hydrofluoric acid: potassium fluoride is 1:4:1, and the reaction is carried out at room temperature for 60 minutes to obtain the doping component precursor K 2 [NbOF 5 ] solution.

[0061] (2) Preparation of doped active components: Dissolve 20g of active component MnO in 300g of precursor solution, and then add excess NH 4 OH to control pH = 9, fully stirred for 20 minutes and mixed to obtain the doping active component.

[0062] (3) Preparation and modified carrier: refer to the general method for preparing clavgrass powder in Example 1 (step 2-3) of patent CN 102794169B, and obtain the sieve component of ATP powder with 200 mesh to 300 mesh. Weigh 100g of powder and put it in...

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Abstract

The invention provides a preparation method of a catalyst for catalyzing incineration of vinyl chloride polymerization moisture-containing tail gas. The method comprises the following steps of: (1) preparing an active component doped precursor: dissolving minerals containing transition metal niobium with acid, adding villiaumite, and carrying out fluorination complexation to generate a doped precursor K2[NbOF5]; (2) preparing a doped active component: mixing the active component MnO with the doped precursor K2[NbOF5], controlling the pH value, and adding alkali for coprecipitation to generatean active component emulsion; (3) preparing and modifying a carrier, namely modifying the carrier attapulgite by using a modifier solution containing a silane coupling agent; and (4) loading an activecomponent: carrying out vacuum impregnation on the active component emulsion, and carrying out roasting molding, wherein the roasting includes a steam passivation process. Through verification on anincineration platform, the catalyst prepared by the method has a good effect on catalytic incineration of the vinyl chloride moisture-containing tail gas.

Description

technical field [0001] The invention belongs to the field of chemical tail gas treatment, and in particular relates to a catalyst for catalyzing and burning vinyl chloride polymerization wet tail gas and a preparation method thereof. Background technique [0002] The reaction conversion rate of producing polyvinyl chloride by vinyl chloride polymerization is about 80%, and the remaining unreacted vinyl chloride is discharged from the polymerization kettle after the polymerization reaction is completed. For the treatment of this chlorine-containing tail gas (chlorine-containing volatile organic compounds, CVOCs, containing a certain amount of water), the common practice in industry is to condense and reuse it first, and then send the non-condensable gas to an incinerator for high-temperature incineration (above 1100°C) , high energy consumption, and will produce harmful substances such as CO, formaldehyde, formic acid, phosgene and other secondary pollution. [0003] Methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/02B01J37/03F23G7/07
CPCB01J37/03B01J37/0207B01J23/34F23G7/07Y02P20/584
Inventor 秦中宇徐彦龙梁高珲李允升朱文俊翟一鸣张宏科
Owner WANHUA CHEM GRP CO LTD
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