Preparation method of diesel oil pour point depressant

Abstract

The invention discloses a preparation method of a diesel oil pour point depressant. The method includes the following steps of firstly, weighing high alcohols, catalyst, polymerization inhibitor and solvent to be sequentially added into a reactor and stirred till solids are completely dissolved, then adding methacrylic acid, and conducting reduced pressure distillation, alkali washing and water washing on the product after reaction ends to obtain methylacrylic acid high-carbon ester; secondly, weighing methylacrylic acid high-carbon ester, maleic anhydride, initiator and solvent to be evenly mixed, conducting reacting at a certain reaction temperature under the protection of nitrogen, adding aromatic amine and catalyst after reaction, changing the reaction temperature for reaction for a certain period of time, conducting reduced pressure distillation on the reaction liquid after reaction ends, then adding an excessive amount of methyl alcohol to generate white precipitates, removing supernate, and conducting washing and vacuum drying on the obtained white precipitates through methyl alcohol to obtain the diesel oil pour point depressant. The prepared diesel oil pour point depressant can remarkably reduce the condensation point of diesel oil and improve the low-temperature flowability of diesel oil; the raw materials are easy to obtain, the synthesis method is simple, and the additive dosage is small.

Description

[0001] [technical field]

[0002] The invention relates to the technical field of preparation of a pour point depressant, in particular to a preparation method of a diesel pour point depressant.

[0003] [Background technique]

[0004] Diesel is a complex mixture of components, which contains n-alkanes, cycloalkanes, olefins and aromatics. Wax is the n-paraffin in diesel oil, and when the temperature drops, the wax crystals in diesel oil will gradually precipitate out. As the temperature decreases, more and more wax crystals are precipitated, thus forming a three-dimensional network crystal, enclosing the oil in it, causing the oil to lose its fluidity and appear in a solidified state, thus affecting the normal use and transportation of diesel oil. In order to improve the low-temperature flow performance of diesel, certain measures must be taken to reduce the freezing point and cold filter point of diesel.

[0005] Diesel pour point depressant, also known as diesel low temper...

Examples

preparation example Construction

[0023] The invention provides a kind of diesel oil point depressant preparation method, comprises the following steps: 1) the synthesis of high-carbon ester of methacrylate: take a certain amount of high-carbon alcohol, catalyst, polymerization inhibitor and solvent and add in the reactor successively, Raise the temperature to 60°C and keep stirring to dissolve the solid completely, then add a certain amount of methacrylic acid to it, raise it to the reaction temperature, and react for a certain period of time. 2) Synthesis of the aminated compound of high carbon methacrylate-maleic anhydride binary copolymer: take a certain amount of high carbon ester methacrylate, maleic anhydride, initiator, solvent and mix uniformly , start the reaction under nitrogen protection and a certain reaction temperature, add a certain amount of aromatic amine to the reaction solution after a certain period of reaction, change the reaction temperature and then react for a certain period of time, af...

Embodiment 1

[0033] The preparation method of diesel oil pour point depressant provided by the present invention comprises the following steps:

[0034] 1) Add 21.4g of tetradecyl alcohol, 0.31g of inhibitor hydroquinone, and 50ml of solvent toluene into a three-neck flask equipped with a condenser, a water separator, and a magnetic stirring device, and heat up to 60°C to dissolve all higher alcohols in quickly add 12.9g of methacrylic acid and 0.48g of catalyst p-toluenesulfonic acid into the three-necked flask and raise it to 125°C. The water generated by the esterification reaction will form with toluene as the reaction temperature rises. The copolymer is distilled out and enters the water separator after being condensed. React at this temperature for 5 hours, and when the amount of water released is observed to be equivalent to the theoretical value, the system is in a yellowish-brown transparent liquid state, and the reaction is terminated.

[0035] After the reaction is completed, t...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is that the higher aliphatic alcohol in step 1) is replaced with cetyl alcohol.

[0001] [technical field]

[0002] The invention relates to the technical field of preparation of a pour point depressant, in particular to a preparation method of a diesel pour point depressant.

[0003] [Background technique]

[0004] Diesel is a complex mixture of components, which contains n-alkanes, cycloalkanes, olefins and aromatics. Wax is the n-paraffin in diesel oil, and when the temperature drops, the wax crystals in diesel oil will gradually precipitate out. As the temperature decreases, more and more wax crystals are precipitated, thus forming a three-dimensional network crystal, enclosing the oil in it, causing the oil to lose its fluidity and appear in a solidified state, thus affecting the normal use and transportation of diesel oil. In order to improve the low-temperature flow performance of diesel, certain measures must be taken to reduce the freezing point and cold filter point of diesel.

[0005] Diesel pour point depressant, also known as diesel low temper...

Examples

preparation example Construction

[0023] The invention provides a kind of diesel oil point depressant preparation method, comprises the following steps: 1) the synthesis of high-carbon ester of methacrylate: take a certain amount of high-carbon alcohol, catalyst, polymerization inhibitor and solvent and add in the reactor successively, Raise the temperature to 60°C and keep stirring to dissolve the solid completely, then add a certain amount of methacrylic acid to it, raise it to the reaction temperature, and react for a certain period of time. 2) Synthesis of the aminated compound of high carbon methacrylate-maleic anhydride binary copolymer: take a certain amount of high carbon ester methacrylate, maleic anhydride, initiator, solvent and mix uniformly , start the reaction under nitrogen protection and a certain reaction temperature, add a certain amount of aromatic amine to the reaction solution after a certain period of reaction, change the reaction temperature and then react for a certain period of time, af...

Embodiment 1

[0033] The preparation method of diesel oil pour point depressant provided by the present invention comprises the following steps:

[0034] 1) Add 21.4g of tetradecyl alcohol, 0.31g of inhibitor hydroquinone, and 50ml of solvent toluene into a three-neck flask equipped with a condenser, a water separator, and a magnetic stirring device, and heat up to 60°C to dissolve all higher alcohols in quickly add 12.9g of methacrylic acid and 0.48g of catalyst p-toluenesulfonic acid into the three-necked flask and raise it to 125°C. The water generated by the esterification reaction will form with toluene as the reaction temperature rises. The copolymer is distilled out and enters the water separator after being condensed. React at this temperature for 5 hours, and when the amount of water released is observed to be equivalent to the theoretical value, the system is in a yellowish-brown transparent liquid state, and the reaction is terminated.

[0035] After the reaction is completed, t...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is that the higher aliphatic alcohol in step 1) is replaced with cetyl alcohol.