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A kind of calcium base catalyst and the method thereof catalytic synthesis alkanolamide surfactant

A technology of surfactant and alkanolamide, applied in the field of surfactant synthesis, can solve the problems of complicated process operation, high residual content of alkyl alkanolamine, increased difficulty in process control, etc., and achieves low residual content, low nitrosamine Risk reduction, avoiding the effect of poor heat transfer

Active Publication Date: 2020-10-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For 1:1 alkanolamide products, although the process of feeding catalyst or adding catalyst intermittently in multiple batches can maintain a high amidation reaction activity in the later stage of the reaction, thereby greatly reducing the residue of alkanolamine in the product However, the residual amount of alkanolamine in the product obtained by this process is still relatively high, and the new problems of increased difficulty in process control and cumbersome process operation

Method used

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  • A kind of calcium base catalyst and the method thereof catalytic synthesis alkanolamide surfactant

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Effect test

Embodiment 1

[0037] 100g8wt%Ca(OH)2 The suspension, 600g of 40wt% KOH solution and 200g of 20wt% NaOH solution were quickly added to a 2L reaction kettle with a vigorous stirring device at the same time, and after vigorous stirring for 30 minutes, the water was evaporated at 130°C to obtain 290g of a blocky white solid, and the blocky solid was crushed It is then used to catalyze the synthesis of alkanolamide surfactants.

Embodiment 2

[0039] 100g1wt%Ca(OH) 2 The suspension, 900g of 40wt% KOH solution and 200g of 20wt% NaOH solution were quickly added to a 2L reaction kettle with a vigorous stirring device at the same time, and after vigorous stirring for 30 minutes, the water was evaporated at 140°C to obtain 410g of a blocky white solid, and the blocky solid was crushed It is then used to catalyze the synthesis of alkanolamide surfactants.

Embodiment 3

[0041] 100g10wt%Ca(OH) 2 The suspension, 1000g of 20wt% KOH solution and 200g of 30wt% NaOH solution were quickly added to a 2L reaction kettle with a vigorous stirring device at the same time, and after vigorous stirring for 30 minutes, the water was evaporated at 140°C to obtain 275g of a blocky white solid, and the blocky solid was crushed It is then used to catalyze the synthesis of alkanolamide surfactants.

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Abstract

The invention discloses a calcium-based catalyst and a method for catalyzing and synthesizing alkanolamide surfactants, belonging to the technical field of surfactant synthesis. The present invention prepares a compound type calcium-based catalyst, utilizes the calcium-based catalyst to catalyze grease or fatty ester and alkanolamine to synthesize an alkanolamide surfactant with light color and less free alkanolamine, which is beneficial to Used in daily chemicals. The calcium-based catalyst of the present invention has the characteristics of slow release, which can maintain high catalytic activity in the later stage of the reaction, and ensure the high conversion rate of alkanolamines into alkanolamide surfactants. The conversion rate of alkanolamines is high and the product The residual amount of alkanolamine in the medium is low, which greatly reduces the risk of nitrosamines caused by the residue of alkanolamine in the product. At the same time, the rate at the initial stage of the reaction is greatly slowed down by the slow release of the catalyst, which effectively avoids the darkening of the product due to poor heat transfer during the synthesis process caused by too fast initial reaction.

Description

technical field [0001] The invention relates to a calcium-based catalyst and a method for catalyzing and synthesizing alkanolamide surfactants, belonging to the technical field of surfactant synthesis. Background technique [0002] Alkanolamides are nonionic surfactants with excellent properties such as thickening, foam stabilization and emulsification. Rust additives are used for cleaning and anticorrosion of metal surfaces and as lubricants for machining processes, etc. [0003] According to the raw material sources of long-chain acyl donors, the methods for synthesizing alkanolamide surfactants mainly include fatty acid method, fatty acid lower alcohol ester method and oil method. In 1937, Wolf Kritchevsky first developed the reaction of fatty acid and diethanolamine to synthesize alkanolamide, but the quality of the product was relatively poor, and its active substance content was only 60%. Invented basic catalysts such as slightly excess fatty acid and alkali metal al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/04C07C231/02C07C233/18C07C233/20B01F17/22B01F17/38C09K23/00C09K23/22C09K23/38
CPCB01J23/02B01J23/04C07C231/02B01J35/19C09K23/22C07C233/18C07C233/20B01J37/0236B01J37/038B01J37/04
Inventor 方云胡学一夏咏梅
Owner JIANGNAN UNIV