Heterogeneous secondary alcohol alkyl glycoside, and synthesis method and application thereof
A technology of sec-octyl alcohol alkyl glycoside and sec-decyl alcohol alkyl glycoside, which is applied in the field of fine chemical surfactants, can solve the problems of product odor, purity and surface activity reduction, and achieve excellent emulsification ability, dispersion and decontamination ability Strong, high content of active substances in the product
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example 1
[0029] Example 1: Isomerized 2-Octanol Alkyl Glycosides
[0030] Under normal pressure, in the reactor that agitator is housed, thermometer, dry dehydration device, add 1.30 moles of isomeric 2-octanols, 0.32 moles of anhydrous glucose, add 0.57 grams of dodecylbenzenesulfonic acid and For the composite catalyst of p-toluenesulfonic acid, heat the mixture and evacuate to a residual pressure of 40mmHg, reflux at 115°C for 4h, stop the reaction when the reaction mixture changes from a suspended state to a clear or light yellow liquid, measure the residual sugar to be 0.25%, add NaOH (32%) to neutralize to a pH of 7.5, then transfer the mixed solution to a distillation device for dealcoholization, adjust the pressure to a residual pressure of 3mmHg, start to heat up to about 150°C, and keep it for 30 minutes until the gas phase temperature drops to 20°C After the dealcoholization is completed, a dark yellow solid is obtained, and the residual alcohol is 0.3%, which is dissolved i...
example 2
[0031] Example 2: Isomerized Sec-Decanol Alkyl Glycosides
[0032] Under normal pressure, in the reactor that agitator is housed, thermometer, dry dehydration device, add 1.34 moles of isomeric sec-decyl alcohols, 0.33 moles of anhydrous glucose, add 0.6 gram of dodecylbenzenesulfonic acid and For the composite catalyst of p-toluenesulfonic acid, heat the mixture and evacuate to a residual pressure of 30mmHg, reflux at a temperature of 115°C for 5h, stop the reaction when the reaction mixture changes from suspension to clear or light yellow liquid, and the residual sugar is 0.2%. Add NaOH (32%) to neutralize until the pH is 8, then transfer the mixed solution to the distillation device for dealcoholization, adjust the pressure to a residual pressure of 3 mmHg, start to heat up to about 170°C for 30 minutes, and then wait for the gas phase temperature to drop to 20°C Dealcoholization finishes, and measuring residual alcohol is 0.4, obtains dark yellow solid, adds deionized wate...
example 3
[0033] Example 3: The performance experiment of the isomerism secondary alcohol alkyl glycoside synthesized by embodiment 1 and 2
[0034] Prepare the straight-chain alkyl glycosides with the same carbon number as in Examples 1 and 2, and the reaction process is as follows:
[0035]
[0036] In the above formula, R represents a C8-18 alkyl group, G represents the number of sugar units, and n represents the number of sugar units combined on each alkyl group or the average degree of polymerization.
[0037] Surface tension (mN / m), see GB / T 22237-2008 for experimental methods
[0038] Viscosity (40°C), see GB / 15357-94 for the test method (usually the measurement temperature is 20°C, when the viscosity is greater than 10000mPa·s, the measurement temperature should be raised to 40°C)
[0039] Foam force (mm) 30s, 3min, 5min, see GB / T 7462-94 for the test method
[0040] See Table 1 for the performance comparison results of isomeric sec-octyl alcohol alkyl glycosides and linear...
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