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Method for preparing polyethyleneimine by using novel solid catalyst

A solid catalyst, a technology for polyethyleneimine, which is applied in the field of preparing polyethyleneimine by a novel solid catalyst, can solve the problems of difficult control of reaction conditions, cumbersome processing, wide molecular weight distribution of polyethyleneimine, etc., and achieves easy control of preparation conditions, mild response

Active Publication Date: 2022-03-22
上海健倬生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although polyethyleneimine can be obtained by polymerizing ethyleneimine under acidic conditions, the existing synthesis process reacts violently and the reaction conditions are difficult to control, so that the molecular weight distribution of the obtained polyethyleneimine is too wide. cumbersome

Method used

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  • Method for preparing polyethyleneimine by using novel solid catalyst
  • Method for preparing polyethyleneimine by using novel solid catalyst
  • Method for preparing polyethyleneimine by using novel solid catalyst

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preparation example Construction

[0032] (2) Preparation of ethyleneimine: using monoethanolamine as raw material, through solid-phase catalyzed gas-phase intramolecular dehydration reaction, react at 250-400°C for 1-10min to prepare an aqueous solution of ethyleneimine, and measure ethyleneimine by gas chromatography The purity was measured by the area normalization method.

[0033] (3) Preparation of polyethyleneimine: first feed the solvent, solid catalyst, and primer in the high-pressure reactor, then pass inert gas to pressurize the system to 0.4-0.6MPa, and then raise the temperature to 120-150°C, Then add ethyleneimine dropwise, control the ethyleneimine dropwise in 4-6h, then raise the temperature of the system to 150-180°C, and keep the temperature for 4-6h to prepare polyethyleneimine.

Embodiment 1

[0034] Embodiment 1 A kind of method that novel solid catalyst prepares polyethyleneimine, comprises:

[0035] (1) Preparation of solid catalyst: Accurately weigh 20 g of spherical polystyrene with a particle size of 100 meshes, add 35 g of oleum (pyrosulfuric acid), and react at 30° C. for 5 h to prepare a solid catalyst; the SEM diagram of the prepared solid catalyst is as follows figure 1 Shown; The average value of solid catalyst acidity measured by acid-base neutralization titration is 3.0mmol / g; The SEM image of the polystyrene before reaction is as follows figure 1 as shown ( figure 1 a and figure 1 b), the surface is relatively flat, without too many pores and layered phenomena; and from the SEM image of the solid catalyst ( figure 1 c and figure 1 d) It can be seen that the surface appearance of the polystyrene after the reaction has been obviously destroyed, uneven cracks have occurred, and layered phenomena have occurred; then the acidity of the solid catalyst ca...

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Abstract

The invention provides a method for preparing polyethyleneimine by using a novel solid catalyst, which comprises the following step of: in the presence of a solvent, the solid catalyst and a primer, polymerizing the polyethyleneimine under certain reaction conditions to prepare the polyethyleneimine, wherein the solid catalyst is prepared from 20-35 parts by weight of a solid catalytic carrier and 20-55 parts by weight of a water-soluble acidic compound at the temperature of 20-80 DEG C. The preparation method comprises the following steps: firstly, modifying a catalyst, and then applying the catalyst to preparation of polyethyleneimine; the preparation conditions are easy to control, the reaction is mild, and the prepared polyethyleneimine product does not need subsequent purification treatment and is green and environment-friendly; in addition, the solid catalyst prepared by the method can be repeatedly used, and a polyethyleneimine product with uniform molecular weight distribution can be obtained.

Description

technical field [0001] The invention belongs to the technical field of polyethyleneimine and its preparation method, and in particular relates to a method for preparing polyethyleneimine with a novel solid catalyst. Background technique [0002] Polyethyleneimine has high reactivity and can react with hydroxyl groups in cellulose and cross-link polymerization to make paper produce wet strength and have dry strengthening effect. In the presence of acid, alkali and aluminum sulfate, it will affect The wet strength and retention rate of paper; using this characteristic of polyethyleneimine, it is used as a wet strength agent for unsized absorbent paper (such as filter paper, ink-blotting paper, toilet paper, etc.), but its broken paper is relatively poor Difficult to deal with. In addition, polyethyleneimine can also be used for pulp water filtration, so that fine fibers in white water are easy to flocculate; it can be used as a color-fixing agent when dyeing paper with acid d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02
CPCC08G73/0213
Inventor 沈健谢彤陈永军陆兴旺
Owner 上海健倬生物科技有限公司
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