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Selecting method for montmorillonite catalyst for dimer acid production

A technology of montmorillonite and catalyst, which is applied in the field of selection of montmorillonite catalysts, and can solve problems such as differences in catalytic activity of montmorillonite catalysts

Inactive Publication Date: 2019-09-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are significant differences in the catalytic activity of different montmorillonite catalysts

Method used

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  • Selecting method for montmorillonite catalyst for dimer acid production
  • Selecting method for montmorillonite catalyst for dimer acid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use n-butylamine titration and XRD characterization to determine the number of acid centers and interlayer spacing of montmorillonites from seven different origins of No. 1-7 (the results are listed in Table 1, and the number of acids in Table 1 is at -3.00 0 <+4.8, the number of acid centers is more than 0.2 mmol / g, and the interlayer spacing is more than 1.5 nm". It can be seen from Table 1 that none of the 1-3 montmorillonites meet the selection conditions, and the 4 -7 montmorillonite meets the selection criteria.

[0016] Among them, the above-mentioned No. 1-7 montmorillonites were respectively purchased from Changxing Longfeng Powder Material Co., Ltd., Tianjin Development Zone Letai Chemical Co., Ltd., Lingshou County Yuanrun Mineral Products Processing Factory, Hangzhou Qiushan Bleaching Earth Co., Ltd., Anji Xusheng Bentonite Processing Co., Ltd., Anji Xusheng Bentonite Processing Co., Ltd. and Huangshan Baiyue Activated Clay Co., Ltd.

[0017] Table 1 The num...

Embodiment 2

[0023] In order to further verify the compliance with "-3.00 The number of acid centers between <+4.8 is more than 0.2 mmol / g, and the interlayer spacing is more than 1.5 nm. When the montmorillonite is used as a catalyst, it has a higher catalytic activity to the production of dimer acid. Montmorillonite was acid-modified.

[0024] The acid modification treatment steps of montmorillonite are: mix 20g of montmorillonite of Example 1 and 200mL of dilute sulfuric acid evenly, stir magnetically at room temperature for 6 hours, then filter the montmorillonite suspension formed by stirring, and pass the filter cake through After washing with deionized water to remove residual sulfuric acid on the surface, drying, grinding and passing through a 200-mesh sieve to obtain acid-modified montmorillonite with a mesh size greater than 200 mesh.

[0025] According to the above-mentioned acid modification treatment steps, when carrying out acid modification to No. 1 montmorillonite of embodi...

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Abstract

The invention discloses a selecting method for a montmorillonite catalyst for dimer acid production. The method is characterized by comprising the following steps: measuring a quantity of acid centers with acid strength of -3.00<+4.8 of montmorillonite and interlayer spacing of the montmorillonite, and selecting the montmorillonite with the quantity of the acid centers with the acid strength of -3.00<+4.8 of 0.2 mmol / g or more and the interlayer spacing of 1.5 nm or more. The method provided by the invention verifies that only when the montmorillonite simultaneously satisfying the following two conditions: '' the quantity of the acid centers with the acid strength of -3.00<+4.8 is 0.2 mmol / g or more and the interlayer spacing is 1.5 nm or more'' is used as the catalyst, the montmorillonite can have higher catalytic activity for production of the dimer acid, thereby having great guiding significance for selection of the suitable montmorillonite and modification of the montmorillonite.

Description

technical field [0001] The invention relates to a method for selecting a montmorillonite catalyst used in dimer acid production. Background technique [0002] The dimerization products of unsaturated fatty acids (dimerized fatty acids) play an important role in the fields of degradable plastics, lubricating oils, inks and hot melt adhesives. Montmorillonite is a natural layered mineral, and it is widely used as a catalyst in the generation of dimer acid. [0003] However, there are significant differences in the catalytic activity of different montmorillonite catalysts. When using montmorillonite in some regions as a catalyst, the yield of dimer acid can be as high as 70%. When using montmorillonite in some areas, the yield is only 44% (Li Fuqiang, Cai Liying, Zhao Suying, Chen Kunxiong and Wu Dan, Journal of Fuzhou University (Natural Science Edition) , 2015, 696-701). [0004] The yields of dimer acid are also significantly different when different modified montmorillo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/236B01J21/16C07C57/13C07C51/353
CPCB01J27/236B01J21/16C07C51/353C07C57/13
Inventor 陆向红汪之禾计建炳廖陈增王博通
Owner ZHEJIANG UNIV OF TECH