Process for producing pentaerythritol oleate

Abstract

The invention relates to a method for preparing pentaerythritol oleic acid ester. The method comprises the following steps that: oleic acid and pentaerythritol generate esterification to produce the pentaerythritol oleic acid ester under the action of catalyst, wherein, the catalyst is lanthanum methanesulfonate. The preparation method has a simple technique, few side reactions, short production period, and high reaction yield and product purity, and can effectively reduce the production cost. Moreover, the aftertreatment is simple and the pollution on the environment is low.

Description

technical field [0001] The invention belongs to the technical field of synthesis of ester compounds in organic chemistry, in particular to a preparation method of pentaerythritol oleate. Background technique [0002] About 50% of lubricating oil enters the environment through volatilization and leakage during use, and the loss of hydraulic oil during use is as high as 70-80%. More than 95% of these lubricating oils are derived from petroleum, and the biodegradability of petroleum-based lubricating oils is very poor; on the other hand, the global oil resources are increasingly scarce, resulting in a shortage of petroleum-based lubricating oil resources. Therefore, the synthesis of biodegradable lubricant base oils from renewable resources has attracted extensive attention. [0003] Pentaerythritol oleate has excellent thermal stability and oxidation stability, good hydrolytic stability, excellent viscosity performance and low temperature performance, etc.; it not only has th...

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Problems solved by technology

[0005] 1. The use of acidic catalysts, especially sulfuric acid with strong corrosiveness and strong oxidizing properties, not only has a low reaction conversion rate, but also severely corrodes the equipment, and the removal of the catalyst requires subsequent processes such as neutralization and water washing, and the production line is long; at the same time, a large amount of waste water emissions will also pollute the environment

[0006] 2. The selectivity of the reaction is poor and there are many side reactions. Under acidic conditions, it is easy to generate by-products such as ether, sulfuric acid ester, and sulfur dioxide. When it is difficult to separate and purify the product, it also reduces the yield and the yield of the product. Purity, affecting the appearance and performance of the product, increasing the production cost

[0007] In addition, in the prior art, the catalyst can also be p-toluenesulfonic acid, p-aminobenzenesulfonic acid, metal oxides, etc. Although using these substances as a catalyst can overcome the above-mentioned several problems to a certain extent, there is a problem that the amount of catalyst used high reaction temperature, poor reusability of catalysts, etc.; and some catalysts remain in the product, which makes the product prone to qualitative change and poor product stability during storage

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