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Preparation method of novel catalyst

A catalyst, a new type of technology, applied in the preparation of organic compounds, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of non-recyclable catalysts, difficulty in separating catalysts, affecting product yields, etc., and achieve reusable performance. Good, great application value, low cost effect

Inactive Publication Date: 2017-09-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, the traditional industrial preparation of trimethylolpropane oleate mainly used concentrated sulfuric acid as a catalyst, which had the disadvantages of serious equipment corrosion, large environmental pollution, and poor product quality.
In recent years, p-toluenesulfonic acid has been widely used in the synthesis of trimethylolpropane oleate. p-toluenesulfonic acid has high catalytic activity and low temperature requirements, but p-toluenesulfonic acid has some shortcomings as a catalyst. It is easily soluble in In the reaction system, it is difficult to separate the catalyst after the reaction. The method of adding alkali to neutralize the catalyst is often used to remove the catalyst. After neutralization, many flocs are produced, which affects the product yield, and the catalyst cannot be recycled.

Method used

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  • Preparation method of novel catalyst
  • Preparation method of novel catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Prepare 5 parts of p-toluenesulfonic acid solutions whose concentrations are respectively 20%, 25%, 30%, 35% and 40%.

[0019] (2) Weigh 5 parts of coal-based activated carbon with a mass of 10 g each, soak them in p-toluenesulfonic acid solutions of different concentrations for 24 hours, filter them with suction, dry them for 5 hours, and cool them down for later use.

[0020] The change curve of determination load and p-toluenesulfonic acid concentration is as follows figure 1 As shown, the p-toluenesulfonic acid concentration of 30% has a higher loading capacity, and the concentration continues to increase, but the loading increase is not obvious, and the cost increases, so the p-toluenesulfonic acid solution concentration of 30% is the best.

Embodiment 2

[0022] Activated carbon-supported p-toluenesulfonic acid catalyst was prepared by impregnation method to obtain catalysts with different loads as above, and trimethylolpropane oleate was catalyzed and synthesized by using trimethylolpropane and oleic acid as raw materials. The reaction conditions are as follows: the molar ratio of acid to alcohol is 2.90:1, the amount of catalyst is 5%, the reaction temperature is 140° C., and the reaction time is 3 hours.

[0023] Investigate the influence of repeated use of the catalyst on the conversion rate of the esterification reaction, the results are as follows figure 2 shown. When the concentration of p-toluenesulfonic acid is 30%, the p-toluenesulfonic acid adsorbed by activated carbon tends to be saturated, and the concentration continues to increase. poor.

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Abstract

A preparation method of a new type of catalyst, which uses coal-based activated carbon as a carrier, p-toluenesulfonic acid as an active component, selects coal-based activated carbon with a particle size of 2-4mm, and a concentration of p-toluenesulfonic acid solution of 30%, and prepares it by impregnation Activated carbon supported p-toluenesulfonic acid catalyst. The method has the advantages of simple preparation process, safe operation, low cost and good catalyst repeatability. The catalyst is used to catalyze the synthesis of ester lubricating oil, the catalyst has high catalytic activity, can be used repeatedly, has high product conversion rate, simple refining process, and has great application value.

Description

technical field [0001] The invention belongs to the preparation of a novel catalyst, and relates to a preparation method of an activated carbon-supported p-toluenesulfonic acid catalyst. This method uses a simple and effective impregnation method, selects the best carrier and active component through experiments, and investigates the influence of the concentration of the active component on the loading capacity. The catalyst prepared by this method has a large application in the field of catalysis value. Background technique [0002] As a new type of green lubricating oil, trimethylolpropane oleate is more and more popular due to its excellent lubricity, good thermal stability, temperature resistance, low toxicity, low volatility and high biodegradation rate. Attention, widely used in chemical fiber oil, metal processing oil, hydraulic oil and aviation engine lubricants and other fields. [0003] In the past, the traditional industrial preparation of trimethylolpropane ole...

Claims

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Application Information

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IPC IPC(8): B01J31/02C07C67/08C07C69/58
CPCB01J31/0225B01J2231/49C07C67/08
Inventor 郑帼刘成林刘燕军周存徐进云孙玉
Owner TIANJIN POLYTECHNIC UNIV