Calcium-based catalyst, and method used for catalytic synthesis of alkanolamide surfactant with calcium-based catalyst

A technology of catalyst and alkanolamine, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, and preparation of organic compounds, etc. It can solve the problems of high residual amount of alkanolamine, increased difficulty of process control, cumbersome process operation, etc. problem, achieve the effect of reducing the risk of nitrosamines, avoiding poor heat transfer and low residue

Active Publication Date: 2019-08-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 resi

Method used

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  • Calcium-based catalyst, and method used for catalytic synthesis of alkanolamide surfactant with calcium-based catalyst

Examples

Experimental program
Comparison scheme
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 used for catalytic synthesis of an alkanolamide surfactant with the calcium-based catalyst, and belongs to the technical field of surfactant synthesis. The composite calcium-based catalyst is used for catalyzing reaction of grease or fatty ester with alkyl alcohol amine to synthesize the alkanolamide surfactant light in color and low in free alkyl alcohol amine content, and it is beneficial for applications in daily chemical products. The calcium-based catalyst possesses slow release characteristic, is capable of maintaining relatively catalytic reaction activity at reaction late period, and ensuring high efficiency conversion of alkyl alcohol amine into the alkanolamide surfactant; alkyl alcohol amine conversion rate is high;alkyl alcohol amine residual amount in obtained product is low; nitrosamine risk of the product caused by alkyl alcohol amine residue is reduced greatly; reaction early period rate is reduced greatlythrough catalyst slow release control, so that poor heat transfer in synthesis process and product color darkening caused by too fast reaction rate at the early stage are avoided effectively.

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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IPC IPC(8): B01J23/04C07C231/02C07C233/18C07C233/20B01F17/22B01F17/38C09K23/00C09K23/22C09K23/38
CPCB01J35/0006B01J23/02B01J23/04C07C231/02C09K23/00C07C233/18C07C233/20B01J37/0236B01J37/038B01J37/04C09K23/22
Inventor 方云胡学一夏咏梅
Owner JIANGNAN UNIV
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