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Method for preparing narrow distribution aliphatic alcohol polyoxyethylene ether

A technology of narrow distribution of alcohol polyoxyethylene ether, which is applied to the preparation of ether from alkylene oxide, preparation of ether, chemical instruments and methods, etc. It can solve the problems of low alcohol ether distribution index, unfavorable product production and application, and wide distribution. Achieve the effects of short heating time, short operation time and low distillation pressure

Inactive Publication Date: 2008-09-10
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to obtain alcohol ethers with narrow molecular weight distribution has been a research topic that people have paid close attention to for a long time. At present, the method for preparing fatty alcohol polyoxyethylene ethers with narrow distribution is mainly realized by ethoxylation catalysts, but this method prepares The distribution index of alcohol ether is low [Cheng Lubai, narrow distribution technology of fatty alcohol ethoxylation [J]. Daily Chemical Industry, 1991 (4): 21-27.], EO distribution is wide, which is not conducive to the production and application of products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 100g of raw material fatty alcohol polyoxyethylene ether AEO into the feeder of the molecular distillation unit 3 (obtained from 12-carbon and 14-carbon mixed fatty alcohols through ethoxylation reaction), this raw material AEO 3 The content of free fatty alcohols in the product is 20.9%, and its distribution index is 77.8%. Set the evaporation temperature of the molecular still to 90°C, the temperature of the condenser to 10°C, turn on the rotary vane vacuum pump and the oil diffusion pump to make the system operating pressure 30Pa, and start feeding when the process parameters reach the set value. The feed rate was 60 g / h and the speed of rotation of the film wiper was 170 rpm. The raw material alcohol ether enters the molecular distillation device through the feeder, and is evenly distributed on the heating surface under the action of the high-speed operation of the wiped film rotor. The raw material is heated on the heating surface, and the light component (ma...

Embodiment 2

[0030] Add 10Kg of raw material fatty alcohol polyoxyethylene ether AEO into the feeder of the molecular distillation unit 3 (obtained from 12-carbon and 14-carbon mixed fatty alcohols through ethoxylation reaction), this raw material AEO 3 The content of free fatty alcohols in the product is 12.3%, and its distribution index is 87.1%. Set the evaporation temperature of the molecular still to 120°C and the temperature of the condenser to 15°C, turn on the rotary vane vacuum pump and the oil diffusion pump to make the operating pressure of the system 50Pa, and start feeding when the process parameters reach the set value. The feed rate is 9Kg / h, and the rotating speed of the film wiper is 500rpm. The raw material alcohol ether enters the molecular distillation device through the feeder, and is evenly distributed on the heating surface under the high-speed operation of the wiped film rotor. The raw material is heated on the heating surface, and the light component (mainly free...

Embodiment 3

[0046] Add 20Kg of raw material fatty alcohol polyoxyethylene ether AEO into the feeder of the molecular distillation unit 3 (obtained from 12-carbon and 14-carbon mixed fatty alcohols through ethoxylation reaction), this raw material AEO 3 The content of free fatty alcohols in the product is 30.1%, and its distribution index is 69.7%. Set the evaporation temperature of the molecular still to 140°C and the temperature of the condenser to 25°C, turn on the rotary vane vacuum pump and the oil diffusion pump to make the operating pressure of the system 100Pa, and start feeding when the process parameters reach the set value. The feed rate is 24Kg / h, and the rotating speed of the film wiper is 240rpm. The raw material alcohol ether enters the molecular distillation device through the feeder, and is evenly distributed on the heating surface under the action of the high-speed operation of the wiped film rotor. The raw material is heated on the heating surface, and the light compon...

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Abstract

The invention relates to a method for preparing narrow distribution fatty alcohol polyoxyethylene ether, comprising the following steps that: alcohol ether raw material is added to a feeder of a molecular distillation apparatus; under the conditions that: the evaporation temperature of a molecular distiller is 70-220 DEG C; a condenser is at the temperature of 0-30 DEG C and at the pressure of 0.1-300 Pa; the rotating speed of a film wiper is 0-1000 rpm, the alcohol ether raw material enters the molecular distillation apparatus from the feeder at the feeding speed of 0.01-100 Kg / h, so as to remove light components in the alcohol ether raw material and obtain primary distillation heavy components; the primary distillation heavy components are added into the feeder of the molecular distillation apparatus for carrying out secondary distillation and removing the heavy components in the primary distillation heavy components; the light components obtained in secondary distillation are just the narrow distribution fatty alcohol polyoxyethylene ether. The method has the advantages of simple process, short operation time, as well as high quality and yield coefficient of products.

Description

technical field [0001] The invention belongs to a method for preparing polyoxyethylene ethers of fatty alcohols with narrow distribution, in particular to a physical method for preparing polyoxyethylene ethers of fatty alcohols with narrow distributions by molecular distillation. Background technique [0002] Fatty alcohol polyoxyethylene ether referred to as alcohol ether (AEO n ), n represents the average ethylene oxide (EO) adduct number, is a class of important nonionic surfactants, the general formula is C n h 2n+1 -(OCH 2 CH 2 ) m -OH. Alcohol ethers and their derivatives have excellent decontamination, wetting and emulsifying dispersing abilities, are less irritating to the skin, have good biodegradability, mild application conditions, and can be obtained by changing the ratio of starter and ethylene oxide. The product of EO adduct number is widely used in daily chemical industry and other production industries. The width of its relative molecular weight distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/11C07C41/03B01F17/42C09K23/42
Inventor 孙永强张秀娜李小秋史修启刘广宇张勇
Owner CHINA RES INST OF DAILY CHEM IND
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