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Process for producing pentaerythritol oleate

A technology of pentaerythritol oleate and esterification reaction, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of non-recycling, difficulty in catalyst recovery, etc., and achieve outstanding catalytic performance and easy Separation, less environmental pollution effect

Inactive Publication Date: 2008-08-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, the synthesis of pentaerythritol oleate catalyzed by p-toluenesulfonic acid is still a homogeneous reaction, so there are still problems such as catalyst recovery difficulties, inability to reuse, and serious water pollution. Therefore, it is necessary to immobilize it on a suitable carrier. It is convenient to separate the product from the catalyst and can be reused, reducing water pollution and reducing production costs

Method used

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  • Process for producing pentaerythritol oleate
  • Process for producing pentaerythritol oleate
  • Process for producing pentaerythritol oleate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 The influence of different carriers on p-toluenesulfonic acid loading

[0028] The interaction between p-toluenesulfonic acid and the surface of the carrier directly affects the firmness of the load and the amount of acid supported. The esterification reaction uses the acidity of the catalyst. Therefore, the load of p-toluenesulfonic acid is related to the acidity and alkalinity of the carrier surface. The performance is closely related. If the surface of the carrier is too basic, the acidity of the catalyst will be greatly weakened or even lose its activity. The present invention compares the acid loading capacity of p-toluenesulfonic acid by activated carbon, diatomaceous earth, montmorillonite and attapulgite with a wide range of sources and low prices, and the results are as follows figure 1 Shown.

[0029] Structurally, activated carbon, diatomite, attapulgite and montmorillonite are all good carriers, but such figure 1 It is shown that under the same condi...

Embodiment 2

[0030] Example 2 The influence of the concentration of p-toluenesulfonic acid solution on the acid load

[0031] Weigh a certain amount of activated carbon and activate it at 120℃ for 2h. After cooling, weigh 10g and soak it in 60g solutions of p-toluenesulfonic acid with different concentrations (25%, 35%, 45%, 55%, 65%) for 42h , Filtration. Dry it at 110°C for 5 hours. After cooling, the catalysts with different acid loadings are obtained, which are put into the drying kettle for later use. Such as figure 2 As shown, the loading capacity increases with the concentration of the p-toluenesulfonic acid solution. When the concentration of the p-toluenesulfonic acid solution reaches 45%, the loading capacity increases slowly. The reasons may be as follows: The p-toluenesulfonic acid in the solution reaches a dynamic equilibrium, and the loading capacity no longer increases.

Embodiment 3

[0032] Example 3 Effect of different acid loading on the reaction

[0033] Take the same amount of catalysts with different loadings to react, the reaction conditions are oleic acid and pentaerythritol molar ratio 4:1, the amount of catalyst is 2% of the total mass of the reactants, and react at 140°C for 2 hours to obtain the acid-loaded catalyst and the ester of the product. A series of data corresponding to the conversion rate, such as image 3 As shown, the content of active components in the catalyst directly affects the activity of the catalyst, and the active components of the catalyst increase with the increase of the acid load. When the acid load reaches 45%, the increase in the esterification rate will be relatively gentle. The reason for this phenomenon may be that when the acid load is too large, the loss of active components is relatively large, and the esterification rate increases slowly. Therefore, about 45% of the acid loading is appropriate.

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Abstract

A preparation method of pentaerythrite oleate belongs to the technical field of the synthesis of the foundation oil of biological degradable lubricating oil; the invention provides an improved preparation method of pentaerythrite oleate, which adopts p-toluene sulfonic acid carried by activated carbon as catalyst, oleic acid and pentaerythritol are regarded as raw material for esterification so as to obtain primary products of the pentaerythrite oleate, then molecule distillation treatment is adopted to obtain the products of pentaerythrite oleate; the preparation method of the pentaerythrite oleate chooses economical activated carbon as the load to carry p-toluene sulfonic acid, the activated carbon can be obtained from a plurality of resources, impregnation method is used as the loading method, the method adopts the p-toluene sulfonic acid carried by activated carbon to catalyze reactions for the first time, which has the advantages of obvious catalyzing performance, the catalyst being easy to be separated from products, no acid waste water pollution being caused, and little pollution being caused to environment, and the catalyst is one of environmental-protection catalyst; the pentaerythrite oleate is beneficial for environmental protection, can prolong the service life of machines, and has good safety and renewable capacity.

Description

Technical field [0001] A preparation method of pentaerythritol oleate adopts activated carbon-supported p-toluenesulfonic acid to catalyze the preparation of pentaerythritol oleate, and belongs to the technical field of biodegradable lubricating oil base oil synthesis. Background technique [0002] In order to reduce the friction and wear of the two relatively moving contact surfaces, lubricating oil is used. Good lubricating oil can improve the efficiency of the machine and keep the machine working reliably for a long time. Lubricating oil is composed of base oil and additives, of which base oil accounts for more than 80%-90%. The main properties of lubricants (such as biodegradability, high temperature stability, low temperature fluidity, etc.) are all determined by the properties of the base oil. At present, the base oil of the lubricant can be mineral oil, animal and vegetable oil and synthetic lubricant. At present, most lubricating oil products are based on mineral oil. Min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/58C07C67/08B01J31/04
Inventor 刘元法王兴国李凯单良金青哲
Owner JIANGNAN UNIV
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