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Acid modified bentonite adsorbent and preparation method thereof

A bentonite and adsorbent technology, which is applied in the field of acid-modified bentonite adsorbent and its preparation, can solve the problems of secondary pollution, complicated operation, complex reaction procedures, etc., and achieve lower equipment requirements, simplified treatment process, and high specific surface area Effect

Inactive Publication Date: 2014-07-02
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the methods for modifying bentonite in the above-mentioned prior art all involve the addition of high-concentration sulfuric acid for acidification, and the prepared filter cake has a large amount of residual acid, complex reaction procedures, harsh treatment conditions, and easy to cause secondary pollution. , and cannot meet the requirements of simple and efficient industrial utilization
Moreover, the hydrothermal treatment process in the above method has high requirements on equipment, complicated operation, and high energy consumption, which is not conducive to long-term and large-scale applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example provides a simple preparation method of a hydrothermally modified bentonite adsorbent, which is prepared through the following steps:

[0047] Using sodium bentonite as raw material, its specific surface area is 26.5m 2 / g, with 3%wt hydrochloric acid and raw material bentonite powder under the condition that the liquid-solid mass ratio is 3:1, treat it in a 95°C hydrothermal kettle for 30h, and the reaction pressure is 0.08MPa. After filtering and washing, at 120°C Dry for more than 5 hours to obtain a bentonite material.

[0048]The prepared bentonite powder was measured for specific surface area and pore volume, and the results are shown in Table 1.

Embodiment 2

[0050] This example provides a simple preparation method of a hydrothermally modified bentonite adsorbent, which is prepared through the following steps:

[0051] Using sodium bentonite as raw material, its specific surface area is 26.5m 2 / g, use 3%wt hydrochloric acid and raw material bentonite powder with a liquid-solid mass ratio of 15:1, treat in a hydrothermal kettle at 110°C for 8h, and the reaction pressure is 0.14MPa. After filtering and washing, at 120°C Dry for more than 5 hours to obtain a bentonite material.

[0052] The prepared bentonite powder was measured for specific surface area and pore volume, and the results are shown in Table 1.

Embodiment 3

[0054] This example provides a simple preparation method of a hydrothermal acid-modified bentonite adsorbent, which is prepared through the following steps:

[0055] Using sodium bentonite as raw material, its specific surface area is 26.5m 2 / g, with 3%wt hydrochloric acid and raw material bentonite powder under the condition that the liquid-solid mass ratio is 8:1, treat it in a hydrothermal kettle at 100°C for 24h, and the reaction pressure is 0.10MPa. After filtering and washing, at 120°C Dry for more than 5 hours to obtain a bentonite material.

[0056] The prepared bentonite powder was measured for specific surface area and pore volume, and the results are shown in Table 1.

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Abstract

The invention provides an acid modified bentonite adsorbent and a preparation method thereof. According to the acid modified bentonite adsorbent provided by the invention, the total pore volume is 0.20-0.40cm<3> / g, and the specific surface area is 90.0-160.0m<2> / g. The preparation method of the acid modified bentonite adsorbent comprises the following steps of mixing a bentonite powder as a raw material and an aqueous solution of acid; carrying out hydrothermal reaction treatment on the mixed slurry, and performing suction filtering on the bentonite slurry after the hydrothermal reaction treatment; and drying and crushing a modified bentonite filter cake after suction filtration to obtain the bentonite adsorbent. With the adoption of the acid modified bentonite adsorbent, the modified bentonite has higher specific surface area and has good performance in the aspect of adsorption.

Description

technical field [0001] The invention relates to the preparation of bentonite, in particular to an acid-modified bentonite adsorbent and a preparation method thereof. Background technique [0002] Promoting the healthy and sustainable development of the environment and the economy is a major theme of global progress today, and the environmental protection measures of the energy and heavy industry industries are of great significance to the protection of the natural environment and resource environment. In recent years, some chemical companies and petrochemical companies have experienced many major environmental pollution incidents such as leaks and explosions. In the face of similar emergencies, it is hoped that a fast, efficient and environmentally friendly pollutant treatment method can be found. The use of physical methods such as adsorption can not only control the diffusion of pollutants, but also avoid secondary pollution to the surrounding soil, water source environmen...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/30
Inventor 郭巧霞郭旭王闻年孟凡芳申宝剑任申勇
Owner PETROCHINA CO LTD
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