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Polymerization method and device of polyisobutylene with medium molecular weight

A technology of polyisobutene and polymerization method, applied in the field of polymer preparation, can solve the problems of difficult control of molecular weight in polymerization production, decreased molecular weight of polyisobutene, unstable product quality, etc., and achieves simple structure, narrow molecular weight distribution, and increased strength. Effect

Active Publication Date: 2012-01-25
ZHEJIANG SHUNDA NEW MATERIAL
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Problems solved by technology

Most of the existing synthetic methods of medium-molecular-weight polyisobutylene adopt a single-reactor continuous production process. No matter what kind of catalyst system is added in the production process, there will be a decrease in the molecular weight of the obtained polyisobutylene while increasing the conversion rate of the polymerization reaction. Polymerization Production molecular weight is not easy to control, uneven distribution, unstable product quality and other problems
In order to obtain stable polyisobutylene with medium molecular weight, it needs to be realized by lowering the reaction temperature or lowering the conversion rate, wherein lowering the reaction temperature has higher requirements on the reaction equipment and more energy consumption; and lowering the conversion rate will make the waste increase, which not only wastes resources, but also increases recycling costs

Method used

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  • Polymerization method and device of polyisobutylene with medium molecular weight
  • Polymerization method and device of polyisobutylene with medium molecular weight
  • Polymerization method and device of polyisobutylene with medium molecular weight

Examples

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Effect test

Embodiment 1

[0032] Add high-purity isobutene with a content of 99.99% to the cyclohexane solution, wherein the reaction molar ratio of isobutene and cyclohexane is 1:2.5. After the reaction is mixed, use a metering pump to transport the mixed isobutene-containing hydrocarbon stream to the reaction In kettle A (reactor A is a vertical cylindrical autoclave with a jacket, so that steam or cold water can be passed into for heating or cooling), the reactants are added to half of the material level of reactor A and stop feeding. After reducing the temperature of the material in the reactor A to -20°C, slowly add pure boron trifluoride into the reactor A; the amount of pure boron trifluoride added is 1‰ of isobutylene. Then continue to add the above-mentioned mixed isobutene-containing hydrocarbon material and pure boron trifluoride in the reactor A. When the A reactor is full, the reactant obtained by the reaction is input from the outlet of the A reactor top with a flow rate of 1300L / h. The f...

Embodiment 2

[0037]Add high-purity isobutene with a content of 99.99% into the propane solution, wherein the reaction molar ratio of isobutene and cyclohexane is 1:5, after the reaction is mixed, use a metering pump to transport the mixed isobutene-containing hydrocarbon stream to the reactor A (Reactor A is a vertical cylindrical autoclave with a jacket so that steam or cold water can be passed into for heating or cooling), and when the reactant is added to half of the material level of A reactor, stop feeding. After reducing the material temperature in the reactor A to -5°C, slowly add pure aluminum trichloride into the reactor A; the amount of pure aluminum trichloride added is 2‰ of isobutylene. Then continue to add the above-mentioned mixed isobutene-containing hydrocarbon material and pure aluminum trichloride in the reactor A, when the A reactor is full, the reactant obtained by the reaction is input from the outlet of the A reactor top with a flow rate of 1900L / h. The feed port pas...

Embodiment 3

[0042] Add high-purity isobutene with a content of 99.99% to the n-butane solution, wherein the reaction molar ratio of isobutene and n-butane is 1:3. After the reaction is mixed, use a metering pump to transport the mixed isobutene-containing hydrocarbon stream to the reaction In kettle A (reactor A is a vertical cylindrical autoclave with a jacket, so that steam or cold water can be passed into for heating or cooling), the reactants are added to half of the material level of reactor A and stop feeding. After reducing the material temperature in reactor A to -10°C, slowly add pure aluminum trichloride into reactor A; the amount of pure aluminum trichloride added is 1.5‰ of isobutylene. Then continue to add the above-mentioned mixed isobutene-containing hydrocarbon material and pure aluminum trichloride in the reactor A, when the A reactor is full, the reactant obtained by the reaction is input from the outlet of the A reactor top with a flow rate of 1500L / h. The feed port pas...

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Abstract

The invention relates to a preparation method of a polymer, in particular to a preparation method of a polyisobutylene polymer with medium molecular weight. The invention provides a polymerization method of isobutylene, which has the characteristics of simple production process, safe use, high conversion rate and low production cost and has superior quality of a final product obtained by preparation. The polymerization method carries out preparation according to the following steps of: (1) adding isobutylene into a solvent of saturated alkyl or naphthenic base and preparing a raw material; (2) putting the raw material into a reaction kettle A and stopping feeding when a reactant is added to one half of the charge level of the reaction kettle A; (3) adding an Lewis acid catalyst into the reaction kettle A slowly; (4) adding the raw material and the Lewis acid catalyst into the reaction kettle A continuously and delivering the reactant into a reaction kettle B from a discharge hole at the top of the reaction kettle A when the reaction kettle A is full; and (5) adding the Lewis acid catalyst into the reaction kettle B slowly and continuously to obtain the required product after reacting for 8 hours continuously.

Description

technical field [0001] The invention relates to a method for preparing a polymer, in particular to a method for preparing a medium-molecular-weight polyisobutene polymer; the invention also relates to a device for preparing the medium-molecular-weight polyisobutene. Background technique [0002] As we all know, medium molecular weight polyisobutylene products were gradually discovered by people at the beginning of the 20th century, and large-scale production began in the German and American business circles in the past half century. Domestic medium molecular weight polyisobutylene products started relatively late, and there are few manufacturers. Medium molecular weight polyisobutylene has a wide range of uses, not only for industrial reproduction, but also as an additive for food, medicine, cosmetics and other industries. At the same time, medium molecular weight polyisobutylene is also an environmentally friendly product, and its excellent physical and chemical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/14C08F110/10C08F2/06C08F2/01
Inventor 孟安盛金田
Owner ZHEJIANG SHUNDA NEW MATERIAL
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