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A preparation method of humic acid kaolin composite adsorbent for polyvinyl chloride tail gas treatment

A technology of tail gas treatment and polyvinyl chloride, which is applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of limited adsorption effect and limit the development of tail gas treatment, and achieve increased specific surface area, fast absorption, and intercalation efficiency high effect

Active Publication Date: 2020-01-17
CHUZHOU HONGYUAN SPRAYING
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AI Technical Summary

Problems solved by technology

In the prior art, adsorbents have been used to treat tail gas, but due to the limited adsorption effect, its development in tail gas treatment is limited, which requires the development of a suitable adsorbent that can quickly and effectively purify PVC tail gas

Method used

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Embodiment Construction

[0015] A preparation method for a humic acid kaolin composite adsorbent for polyvinyl chloride tail gas treatment, comprising the following specific steps:

[0016] (1) Add 5g of humic acid to 1L of ultrapure water pre-adjusted to a pH of 9, mechanically stir evenly, pressurize to 10MPa, heat to 250°C, and stir at a speed of 300 rpm through subcritical water treatment technology React for 24 hours to obtain modified humic acid;

[0017] (2) Add 50g of kaolin to 1L of ultrapure water pre-adjusted to a pH of 9, mechanically stir evenly, pressurize to 10MPa, heat to 250°C, and stir at a speed of 300 rpm for 24 hour, obtain modified kaolin;

[0018] (3) Mix the modified humic acid with the modified kaolin, add 3 times the amount of ultrapure water with a pre-adjusted pH of 9, stir evenly, put it into an electric shaker, and shake it at room temperature at a speed of 250 rpm 3 days, then freeze at -18°C, sublimate the liquid directly under a vacuum of 10 Pa for drying, and finall...

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Abstract

The invention discloses a preparation method of a humic acid kaolin composite adsorbent for polyvinyl chloride tail gas treatment. The preparation method comprises: respectively preparing modified kaolin and modified humic acid through a subcritical water treatment method, and treating the modified kaolin and the modified humic acid through a series of processes. According to the present invention, by treating the humic acid, the treated humic acid can be combined at the active site on the surface of the inner layer of the kaolin through coordination bond, electrostatic interaction and other means, such that the intercalation efficiency is high, the loose porous property of the internal structure of the composite material is further enhanced, and the structure is dense and is difficultly damaged; with the application of the composite material to perform temperature changing and pressure changing adsorption treatment on polyvinyl chloride gas, the effect is significant, the absorption is rapid, the process is physical adsorption, additional toxic substances and three-waste cannot be generated, and the requirements of environmental protection and safety can be met.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride production tail gas treatment, in particular to a preparation method of a humic acid kaolin composite adsorbent used for polyvinyl chloride tail gas treatment. Background technique [0002] Polyvinyl chloride (PVC) resin is a thermoplastic polymer formed by polymerizing vinyl chloride monomer (VCM). It has the advantages of good insulation, strong corrosion resistance, excellent flame resistance and high mechanical strength. It is used in industry, agriculture and Daily life and other aspects have a wide range of applications. However, in the vinyl chloride polymerization reaction process, the conversion cannot be fully realized, and the general conversion rate is about 80%-90%, and because the feed gas contains impurities (containing part of acetylene that has not yet participated in the reaction), the vinyl chloride tail gas , during the pressurized rectification process, the tail ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01D53/047
CPCB01D53/0462B01D53/047B01D2253/25B01D2257/2064B01D2258/02B01J20/12B01J20/24B01J2220/46
Inventor 王新志张凯郑海迪
Owner CHUZHOU HONGYUAN SPRAYING
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