Long-chain carboxyl betaine surfactant and preparation method thereof

Abstract

The invention relates to a long-chain carboxyl betaine surfactant and a preparation method thereof, and belongs to the technical field of surfactants. The preparation method is characterized in that: long-chain fatty acid is subjected to halogenation, amidation and beta-propiolactone quaternization reactions in turn to obtain corresponding long-chain carboxyl betaine. The method has the advantages that simple separation and purification means can obtain pure surfactants without inorganic salt and organic salt, and provides possibility for the application of the surfactant in a wider range.

Description

technical field

[0001] The invention belongs to the technical field of surfactants, and particularly provides a long-chain carboxybetaine surfactant and a preparation method thereof. The long-chain carboxybetaine surfactant obtained by the method does not contain inorganic salt and organic salt impurities. Background technique

[0002] Surfactant is known as "industrial monosodium glutamate". It is widely used in the daily chemical industry and is closely related to human life. Betaine surfactant has a unique structure, excellent performance, very mild effect, and little irritation to the skin. It has been widely used It is used in many fields such as leather treatment, personal cleanser, food additives, etc., and occupies a pivotal position in the entire surfactant industry.

[0003] At present, the purification of betaine is extremely complicated, and most of them use ion exchange resin method, reversed-phase chromatography column method, etc. The common disadvantages of t...

Examples

Embodiment 1

[0016] A 18 B 3 Synthesis of -2C

[0017] (1) Preparation of stearyl chloride: Take 0.1mol (28.5g) of stearic acid and place it in a reaction flask, heat it in an oil bath to 90°C, add 0.2mol (23.8g) of SOCl dropwise 2 , reflux, halogenation reaction 5h, stop the reaction, distill off excess SOCl 2 , to obtain a brown liquid that is stearyl chloride.

[0018] (2) Preparation of N,N-dimethyl-N'-stearamide: 0.105mol (10.7g) N,N-dimethylpropylenediamine was placed in a reaction flask, 200ml of acetonitrile was added, and 0.1 mol (30.4g) of stearyl chloride, cooled in an ice-water bath for 5h to obtain the crude product of a light yellow solid, and the crude product was washed with acetone to obtain N,N-dimethyl-N'-stearamide (A 18 B 3 ).

[0019] (3) Preparation of long-chain alkyl amido carboxy betaine: take 0.1mol (36.9g) of the above-mentioned tertiary amine intermediate A 18 B 3 And 0.12mol (8.6g) β-propiolactone was added to the reaction flask, 200ml ethyl acetate wa...

Embodiment 2

[0021] A 22U B 3 Synthesis of -2C

[0022] (1) Preparation of erucoyl chloride: Take 0.1mol (33.8g) of erucic acid (cis-n-docos-13-enoic acid) in a reaction flask, heat the oil bath to 40°C, add 100ml of CH 2 Cl 2 , add dropwise 0.2mol (23.8g) of SOCl 2 , reflux, halogenation reaction 5h, stop the reaction, distill off excess SOCl 2 , the brown liquid obtained is erucoyl chloride.

[0023] (2) Preparation of N,N-dimethyl-N'-erucamide: 0.105mol (10.7g) N,N-dimethylpropylenediamine was placed in a reaction flask, 200ml of acetonitrile was added, and 0.1mol was added dropwise (35.7g) erucoyl chloride, cooled and reacted in an ice-water bath for 5h, obtained a slightly yellow solid crude product, and the crude product was washed with acetone to obtain N,N-dimethyl-N'-long-chain alkylamide (A 22U B 3 ).

[0024] (3) Preparation of long-chain alkyl amido carboxy betaine: take 0.1mol (36.9g) of the above-mentioned tertiary amine intermediate A 22U B 3 and 0.12mol (8.6g) of ...

technical field

[0001] The invention belongs to the technical field of surfactants, and particularly provides a long-chain carboxybetaine surfactant and a preparation method thereof. The long-chain carboxybetaine surfactant obtained by the method does not contain inorganic salt and organic salt impurities. Background technique

[0002] Surfactant is known as "industrial monosodium glutamate". It is widely used in the daily chemical industry and is closely related to human life. Betaine surfactant has a unique structure, excellent performance, very mild effect, and little irritation to the skin. It has been widely used It is used in many fields such as leather treatment, personal cleanser, food additives, etc., and occupies a pivotal position in the entire surfactant industry.

[0003] At present, the purification of betaine is extremely complicated, and most of them use ion exchange resin method, reversed-phase chromatography column method, etc. The common disadvantages of t...

Examples

Embodiment 1

[0016] A 18 B 3 Synthesis of -2C

[0017] (1) Preparation of stearyl chloride: Take 0.1mol (28.5g) of stearic acid and place it in a reaction flask, heat it in an oil bath to 90°C, add 0.2mol (23.8g) of SOCl dropwise 2 , reflux, halogenation reaction 5h, stop the reaction, distill off excess SOCl 2 , to obtain a brown liquid that is stearyl chloride.

[0018] (2) Preparation of N,N-dimethyl-N'-stearamide: 0.105mol (10.7g) N,N-dimethylpropylenediamine was placed in a reaction flask, 200ml of acetonitrile was added, and 0.1 mol (30.4g) of stearyl chloride, cooled in an ice-water bath for 5h to obtain the crude product of a light yellow solid, and the crude product was washed with acetone to obtain N,N-dimethyl-N'-stearamide (A 18 B 3 ).

[0019] (3) Preparation of long-chain alkyl amido carboxy betaine: take 0.1mol (36.9g) of the above-mentioned tertiary amine intermediate A 18 B 3 And 0.12mol (8.6g) β-propiolactone was added to the reaction flask, 200ml ethyl acetate wa...

Embodiment 2

[0021] A 22U B 3 Synthesis of -2C

[0022] (1) Preparation of erucoyl chloride: Take 0.1mol (33.8g) of erucic acid (cis-n-docos-13-enoic acid) in a reaction flask, heat the oil bath to 40°C, add 100ml of CH 2 Cl 2 , add dropwise 0.2mol (23.8g) of SOCl 2 , reflux, halogenation reaction 5h, stop the reaction, distill off excess SOCl 2 , the brown liquid obtained is erucoyl chloride.

[0023] (2) Preparation of N,N-dimethyl-N'-erucamide: 0.105mol (10.7g) N,N-dimethylpropylenediamine was placed in a reaction flask, 200ml of acetonitrile was added, and 0.1mol was added dropwise (35.7g) erucoyl chloride, cooled and reacted in an ice-water bath for 5h, obtained a slightly yellow solid crude product, and the crude product was washed with acetone to obtain N,N-dimethyl-N'-long-chain alkylamide (A 22U B 3 ).

[0024] (3) Preparation of long-chain alkyl amido carboxy betaine: take 0.1mol (36.9g) of the above-mentioned tertiary amine intermediate A 22U B 3 and 0.12mol (8.6g) of ...

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