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Preparation method of polyisobutylene maleic anhydride

A technology of polyisobutylene and maleic anhydride, applied in the field of lubricating oil additives

Active Publication Date: 2021-05-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that the solubility of maleic anhydride in polyisobutene is only 0.5% under normal pressure, and the two raw materials of polyisobutene and maleic anhydride are incompatible with each other, which belongs to the liquid-liquid two-phase blending reaction.

Method used

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  • Preparation method of polyisobutylene maleic anhydride
  • Preparation method of polyisobutylene maleic anhydride

Examples

Experimental program
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Effect test

Embodiment 1

[0062] (1) Add Jihua high-activity polyisobutylene PIB-1000 (200g) into the pressure-resistant reactor, then start stirring and temperature control, gradually raise the temperature to the reaction temperature to 210°C, and feed a large amount of N into the reactor 2 Purge the air in the replacement reactor, then seal the reactor and continue to feed N 2 Make the inside of the reactor in a "slightly positive pressure" state of 0.5MPa.

[0063] (2) Heat 25.5g of maleic anhydride (the molar ratio of polyisobutylene to maleic anhydride is 1:1.3) to 70°C to make it in a molten state, and then feed the molten maleic anhydride to step (1) through a booster pump The reactor was continuously added dropwise for 3 hours, and the reaction was continued for 10 hours by maintaining a "micro positive pressure" of 0.5 MPa after the dropwise addition was completed.

[0064] (3) After the reaction is completed, the temperature is lowered to 180°C, the pressure in the reactor is released to nor...

Embodiment 2

[0068] (1) Add Yangzi BASF high-activity polyisobutylene PIB-1300 (200g) into the pressure-resistant reactor, then start stirring and temperature control, gradually raise the temperature to the reaction temperature to 215°C, and feed a large amount of N into the reactor 2 Purge the air in the replacement reactor, then seal the reactor and continue to feed N 2 Make the inside of the reactor in a "slightly positive pressure" state of 1.2MPa.

[0069] (2) Heat 21.1g of maleic anhydride (the molar ratio of polyisobutylene to maleic anhydride is 1:1.4) to 70°C to make it in a molten state, and then feed the molten maleic anhydride to step (1) through a booster pump The reactor was continuously added dropwise for 5 hours, and after the dropwise addition was completed, a "micro positive pressure" of 1.2 MPa was maintained to continue the reaction for 8 hours.

[0070] (3) After the reaction is completed, the temperature is lowered to 180°C, the pressure in the reactor is released to...

Embodiment 3

[0074] (1) Add Jihua high-activity polyisobutylene PIB-2300 (200g) into the pressure-resistant reactor, then start stirring and temperature control, gradually raise the temperature to the reaction temperature to 220°C, and feed a large amount of N into the reactor 2 Purge the air in the replacement reactor, then seal the reactor and continue to feed N 2 Make the inside of the reactor in a "slightly positive pressure" state of 0.8MPa.

[0075] (2) Heat 11.1g of maleic anhydride (the molar ratio of polyisobutylene to maleic anhydride is 1:1.3) to 70°C to make it in a molten state, and then feed the molten maleic anhydride to step (1) through a booster pump The reactor was continuously added dropwise for 7 hours, and after the dropwise addition was completed, 0.8 MPa "micro positive pressure" was maintained to continue the reaction for 4 hours.

[0076] (3) After the reaction is completed, the temperature is lowered to 180°C, the pressure in the reactor is released to normal pre...

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Abstract

The invention relates to a preparation method of polyisobutylene maleic anhydride. The preparation method comprises the following steps: (1) adding polyisobutylene into a reactor, stirring, heating to a reaction temperature, introducing a large amount of inert gas into the reactor through a booster pump to purge and replace air, sealing a reaction kettle, and continuously introducing the inert gas to enable the reactor to be in a micro-positive pressure state; (2) heating maleic anhydride to a molten state, then continuously dropwise adding the maleic anhydride into the reactor in the step (1) for several hours through a booster pump, and after dropwise adding is completed, keeping the micro-positive pressure to continuously react for several hours; and (3) after the reaction is finished, cooling to 150-180 DEG C, releasing the pressure in the reactor to normal pressure, and introducing a large amount of inert gas for gas stripping to finally obtain the product. According to the method, the solubility of maleic anhydride in polyisobutene is effectively improved; and the defects of scorching, coking and the like caused by overlarge instantaneous concentration after one-time addition in the traditional process are overcome.

Description

technical field [0001] The invention relates to a method for synthesizing polyisobutylene maleic anhydride, in particular to a method for preparing polyisobutylene maleic anhydride by micro-positive pressure, and belongs to the technical field of lubricating oil additives. Background technique [0002] Polyisobutylene maleic anhydride (PIBSA for short) is an important chemical intermediate raw material, and its derived downstream products are widely used in emulsion explosives, surfactants, lubricating oil additives and other industries. Polyisobutylene succinimide ashless dispersant is currently the most widely used ashless dispersant for lubricating oil. Its preparation process mainly includes alkylation and amination processes: (1) Alkylation process: polyisobutylene React with maleic anhydride to generate polyisobutylene maleic anhydride; (2) Amination process: PIBSA is prepared by reacting with polar group polyethylene polyamines (usually diethylenetriamine, triethylene...

Claims

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Application Information

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IPC IPC(8): C08F8/46C08F110/10
CPCC08F8/46C08F110/10
Inventor 刘智峰黄卿张荷周旭光
Owner PETROCHINA CO LTD
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