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A molding process of composite water-absorbing material

A technology of water-absorbing material and molding process, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of easily broken molding particles, blocked pores, adsorption capacity, poor adhesion of molecular sieves, etc., and achieves a simple and economical preparation process. Operation steps, the effect of large adsorption capacity

Active Publication Date: 2018-03-02
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commonly used ones such as molecular sieves have poor cohesiveness, and their shaped particles are easily broken under the force of the adsorption bed's own weight, making the system unable to operate effectively for a long time.
Adding binders (such as cement and silica gel) during the molding process can increase the strength of the adsorbent, but the molding process often results in blockage of some pores and a large loss of adsorption capacity, and the adsorption capacity and mechanical strength cannot be balanced (Tang Maohui, Ammonia Preparation of Composite Adsorbent, Dissertation, Sichuan University, 2008)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 500 g of mesoporous silicon molecular sieve MCM-41 and mix it with 5000 ml of methanol to form a carrier alcohol solution, add tetraethylenepentamine to the carrier alcohol solution, and the mass ratio of tetraethylenepentamine to MCM-41 is 40%. Stir at room temperature for 4 hours, and then dry. The dried powder is tableted by a roller flat granulator, and then pulverized into 20-40 mesh particles to obtain tetraethylenepentamine (40%) / MCM-41 composite water-absorbing material. The composite water-absorbing material has an adsorption capacity of 122mg / g for trace amounts of water, a crushing strength greater than 38N, and a 24-hour shake flask test particle crushing rate of less than 1%.

Embodiment 2

[0018] Take 1000 g of mesoporous silicon molecular sieve SBA-15 and mix it with 15000 ml of methanol to form a carrier alcohol solution, add diethanolamine to the carrier alcohol solution, the mass ratio of diethanolamine to SBA-15 is 65%. Stir at room temperature for 6 hours, then dry, and extrude the dried powder through a rotary dry press to obtain a diethanolamine (65%) / SBA-15 composite water-absorbing material with a diameter of 1.5 mm. The composite water-absorbing material has an adsorption capacity of 164 mg / g for trace amounts of water, a crushing strength greater than 45 N, and a 24-hour shake flask test particle crushing rate of less than 1%.

Embodiment 3

[0020] Take 200 g of mesoporous silica molecular sieve FDU and mix it with 1000 ml of methanol to form a carrier alcohol solution, add polyethyleneimine to the carrier alcohol solution, and the mass ratio of polyethyleneimine to FDU is 45%. Stir at room temperature for 5 hours, and then dry. The dried powder is compressed into tablets by a roller flat granulator and crushed to form 40-60 mesh particles to obtain polyethyleneimine (45%) / FDU composite water-absorbing material. The composite water-absorbing material has an adsorption capacity of 151mg / g for trace amounts of water, a crushing strength greater than 47N, and a particle crushing rate of less than 2% in a 24-hour shake flask test.

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Abstract

The invention discloses a molding process of a composite water-absorbing material. The porous carrier, an amine modifier and an alcohol solvent are stirred and mixed uniformly, dried, and the obtained dried powder is granulated to obtain a molded granular composite water-absorbing material. The granular composite water-absorbing material formed by the process has a high adsorption capacity for water and high strength.

Description

technical field [0001] The invention relates to a preparation method of a composite water-absorbing material, in particular to a molding process of the composite water-absorbing material. Background technique [0002] SF 6 Gas-insulated electrical equipment has the advantages of less floor space, less electromagnetic pollution, and safety and reliability. It is widely used in urban power grids, but the unavoidable traces of water inside it, usually 20-200ppm, can form insulation defects and Further deterioration during partial discharge, thus forming a potential safety hazard for equipment. So to protect SF 6 For safe and stable operation of electrical equipment, a certain amount of adsorbents are usually placed in the air chamber of the equipment, such as 4A, 5A, 13X, KDHF-03 and other molecular sieves and neutral alumina. However SF 6 The insulating gas will be in SF 6 Decomposition occurs when partial discharge occurs inside the equipment, and the content and growth ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22
Inventor 唐念李丽刘洁樊小鹏黎晓淀黄成吉周永言汤龙华
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID