Cationic surfactant and preparation method thereof
A technology of surfactant and cation, applied in the field of cationic surfactant and its preparation, to achieve the effects of no three wastes, mild reaction conditions and high yield
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Publication Date
- 2011-09-21
- Estimated Expiration
- Not applicable · inactive patent
Smart Images
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Abstract
Description
technical field
[0001] The invention relates to the field of fine chemicals, in particular to a cationic surfactant and a preparation method thereof. Background technique
[0002] Surfactants are a class of fine chemicals that have been widely used in various fields such as industrial production, washing cosmetics, pesticides, medicine, printing and dyeing, tertiary oil recovery, sterilization, and sewage treatment. With the development of the surfactant industry, cationic surfactants Agents have received much attention in terms of fabric softening. The structural characteristics of general fabric softener cationic surfactants are: quaternary ammonium salt products containing two long-chain alkyl groups in the molecular structure. A typical representative compound is distearyldimethylammonium chloride (D1821).
[0003] With the enhancement of people's environmental awareness, quaternary ammonium salts with high biodegradation rate and convenient production and operation ha...
Examples
Embodiment 1
[0028] The first step: the synthesis of methyldiethanolamine laurate
[0029] In a reaction flask equipped with a rectifying column, respectively add 35.7g (0.30mol) of methyldiethanolamine, 132g (0.66mol) of n-dodecanoic acid and 0.5g of catalyst p-toluenesulfonic acid, Melt at ℃, then stir the reaction, and monitor the progress of the reaction through the water content in the water separator. After about 8-10 hours, stop the reaction when the separated water reaches 95% of the theoretical water separation. The resulting reactant was dissolved in CHCl 3 , washed with water, evaporated to remove the organic phase, and dried over anhydrous sodium sulfate to obtain the product methyldiethanolamine laurate as a light yellow liquid, with a weight of 122g. The purity detected by gas chromatography normalization was 97%, and the yield was 81%.
[0030] The second step: the synthesis of diethyl dodecanoate methyl benzyl ammonium chloride
[0031] Add 20.0 g (0.04 mol) of methyldie...
Embodiment 2
[0035] Operate in the same manner as in Example 1, only change the n-dodecanoic acid 132g (0.66mol) used therein into n-dodecanoic acid 144g (0.72mol), and the others remain unchanged, so that the product lauric acid methyldiethanolamine ester is light yellow The liquid has a weight of 126g, and the gas chromatography normalized detection purity is 97%, and the yield is 83.6%.
[0036] Based on methyldiethanolamine, the total yield of diethyl dodecanoate methyl benzyl ammonium chloride is 64.6%.
Embodiment 3
[0038] Operate in the same manner as in Example 1, only change the benzyl chloride 5.40g (0.048mol) used in the synthetic method of the second step to 6.75g (0.06mol) of benzyl chloride, and the others remain unchanged to obtain the quaternary ammonium salt product, and the weight is received 21.5g, the purity detected by bromophenol blue two-phase titration method is 94.0%, and the second-step synthesis yield is 84.4%.
[0039] Based on methyldiethanolamine, the total yield of diethyl dodecanoate methyl benzyl ammonium chloride is 68.4%.