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Preparation method for polymethacrylate pour point depressant

A technology of polymethacrylate and polymethacrylate higher alcohol ester is applied in the petroleum industry, lubricating composition and other directions, which can solve the problems of easy explosion, environmental pollution, inflammability and explosion, and eliminate the source of explosion. , the effect of reducing costs and shortening the response time

Inactive Publication Date: 2012-08-08
SHENYANG GREAT WALL LUBRICANT OIL
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The disadvantage of this traditional method is that the esterification reactor is continuously heated during the esterification process to keep the esterification reactor running at a high temperature, thereby continuously generating pressure in the reactor
With the prolongation of time, the pressure in the reaction kettle continues to rise, which is very prone to explosion; the second is that most of the water-carrying agents are flammable and explosive products, especially toluene commonly used in the esterification process, which is not only flammable and explosive, Moreover, it is toxic. During use, if you do not pay attention, there will be a combustion explosion, or even a poisoning accident; third, because the water-carrying agent is slightly soluble in water, a certain amount of water-carrying agent will be discharged into nature in the sewage discharge. cause environmental pollution

Method used

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  • Preparation method for polymethacrylate pour point depressant
  • Preparation method for polymethacrylate pour point depressant

Examples

Experimental program
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Effect test

example 1

[0024] Example 1: In a 1000 mL three-necked flask equipped with a distillation head, add single C 14 428g (2mol) of fatty alcohol, 2.2mol of methacrylic acid, 2g of hydroquinone as a polymerization inhibitor, and 6.2g of sulfuric acid as a catalyst. Slowly raise the temperature. When the temperature reaches 60°C, turn on the vacuum pump to a vacuum degree of -0.1mpa for vacuum dehydration. Continue to raise the temperature and perform esterification at 95-100°C. After about 5 hours, the quality in the recovery bottle does not change, and the reaction is stopped to obtain crude tetradecyl methacrylate. After neutralizing the obtained crude product with aqueous sodium hydroxide solution to pH = 7, the organic layer was separated, washed with water and saturated brine, and dehydrated under reduced pressure by turning on the vacuum pump to obtain myristyl methacrylate with a conversion rate of 97.5%.

example 2

[0025] Example 2: In a 1000 mL three-necked flask equipped with a distillation head, add C 8 -C 18 Mixed fatty alcohol 417g (2mol), average molecular weight 208.68, 2.2mol methacrylic acid, polymerization inhibitor hydroquinone 2g, catalyst sulfuric acid 6.0g, heat up slowly, when the temperature reaches 60°C, turn on the vacuum pump to vacuum degree -0.1mpa , vacuum dehydration. Continue to raise the temperature and esterify at 95-100°C. After about 5 hours, the quality in the recovery bottle does not change, and the reaction is stopped to obtain the crude mixed higher alcohol methacrylate. After neutralizing the obtained crude product with aqueous sodium hydroxide solution to pH = 7, separate the organic layer, wash the organic layer with water, and wash with saturated brine, then turn on the vacuum pump for dehydration under reduced pressure to obtain mixed higher alcohol methacrylate with a conversion rate of 96.8% .

example 3

[0026] Example 3: Replace the sulfuric acid in Example 2 with 6.0 g of p-toluenesulfonic acid to obtain mixed higher alcohol methacrylate with a conversion rate of 96.5%.

[0027] 2. Distillation and purification

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Abstract

The invention provides a preparation method for polymethacrylate pour point depressant, which solves the problem that a traditional preparation method utilizes an organic solvent to serve as dehydrant, one of the shortcomings of the method is that in the esterification process, because of long time, pressure in a reaction kettle is high, the kettle extremely easily explode, second, dehydrant is usually a flammable and explosive product, especially toluene commonly used in the esterification process not only is flammable and explosive, but also has toxicity; and third, due to the fact the dehydrant is slightly soluble in water, certain amount of dehydrant is discharged to the natural world in the sewage discharge and causes environment pollution. The preparation method for the polymethacrylate pour point depressant is characterized in that the dehydrant is removed, esterification is performed through a method of vacuum pressure reduction, namely in the esterification process, water produced in the esterification process is absorbed from the reaction kettle by utilizing negative pressure, and the conversion of a esterification reaction is improved. The preparation method for the polymethacrylate pour point depressant has the advantage of overcoming the defects existing in the traditional method.

Description

technical field [0001] The invention belongs to the field of petroleum lubricating oil additives-point depressants, and in particular relates to an esterification method for producing polymethacrylate and a treatment method for the color of the esterified product. Background technique [0002] The function of the pour point depressant is mainly to lower the freezing point of the oil. The pour point depressant is a chemically synthesized polymerization or condensation product. Its molecules generally contain polar groups and alkyl chains similar in structure to paraffin hydrocarbons. Through the adsorption on the surface of paraffin crystals or the formation of eutectics with them, the wax can be changed. The shape and size of the crystals prevent the wax crystal grains from bonding to form a three-dimensional network structure, so that uniform and loose crystal grains are formed, thereby maintaining the fluidity of the oil at low temperature. [0003] Polymethacrylate is a ...

Claims

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Application Information

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IPC IPC(8): C08F120/18C08F220/18C10M145/14C10N30/02
Inventor 张贵林于洋
Owner SHENYANG GREAT WALL LUBRICANT OIL
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