Process for producing polyisobutene succinimide ashless dispersant by free radical method

Abstract

The invention provides a method for producing a polyisobutylene succinimide ashless disperser by adopting the freeradical method. The method comprises the following steps that: the polyisobutene is put into a reactor which is heated to a temperature of between 100 and 150 DEG C; the maleic anhydride is put into the reactor and is mixed evenly with the polyisobutene; a freeadical evocating agent is added drop by drop at a constant temperature; the mixture is heated to perform the alkylation reaction; the sampling analysis is performed at any time in the reaction process, after the reaction is finished, the mixture is filtered to obtain the polyisobutylene succinic anhydride; base oil is added into the polyisobutylene succinic anhydride; the mixture is heated and the polyene polyamine is added drop by drop to perform the amidation reaction; the subpressure dehydration is performed, the reaction is finished when no water is dehydrated; the reacting substance is filtered to obtain the polyisobutylene succinimide ashless disperser. In the alkylation reaction process, the method does not need a solvent, adopts the one step of freeradical alkylation technique and has the advantages of short production cycle, low reaction temperature, light chroma, low production energy consumption and environmental protection; the product performance is comparable with the like products at home and abroad.

Description

technical field [0001] The invention relates to a method for producing polyisobutylene succinimide ashless dispersant by free radical method. Background technique [0002] At present, the preparation method of polyisobutylene succinimide ashless dispersant mainly contains the following several kinds: [0003] USP3231587, USP3912764 discloses a kind of method for preparing polyisobutylene succinic anhydride with chlorine gas triggering alkylation process, this method is owing to have used chlorine gas as raw material, and can produce a large amount of hydrogen chloride gas in the reaction process, can affect conventional chemical equipment Cause serious corrosion and pollute the environment, also can endanger the physical and mental health of production personnel simultaneously; Also because certain residual chlorine remains in the product, to make the use of product also subject to certain restriction in addition. [0004] USP3202678, USP3361673 disclose a kind of method th...

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Problems solved by technology

[0003] USP3231587, USP3912764 discloses a kind of method for preparing polyisobutylene succinic anhydride with chlorine gas triggering alkylation process, this method is owing to have used chlorine gas as raw material, and can produce a large amount of hydrogen chloride gas in the reaction process, can affect conventional chemical equipment Cause serious corrosion and pollute the environment, and also endanger the physical and mental health of production personnel; in addition, due to the residual chlorine in the product, the use of the product is also subject to certain restrictions.

[0004] USP3202678, USP3361673 disclose a kind of method that prepares polyisobutylene succinic anhydride with thermal addition process, this method has advantages such as technique is simple, does not have special requirement to equipment, but also exists simultaneously reaction temperature height, reaction cycle is long, product Disadvantages such as dark color and high production energy consumption

[0005] CN1088218A discloses a process for preparing polyisobutylene succinic anhydride by oxidation of polyisobutylene and then radical-induced alkylation. Because the method will carry out the oxidation reaction of polyisobutylene before the alkylation reaction, the preparation process is complicated and the reaction period of the product is prolonged. The energy consumption increases, and due to the high temperature of the oxidation reaction, the structure of the oxidation product is complex, the product is dark in color, and the product quality is affected to a certain extent.

[0006] CN1313505C discloses a kind of technology that uses solvent method to combine free radical to trigger alkylation to prepare polyisobutylene succinimide, because this method will add a large amount of solvents in the production process, make preparation process complicate, desolventization process will consume more More energy and longer time will lead to increased production energy consumption and prolonged reaction cycle. The solvent will inevitably be consumed in the production process. Part of the consumed solvent will remain in the product and affect product quality, while the other part will Diffusion into the atmosphere and the environment, affecting the surrounding environment and air quality

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