Method for producing pentaerythritol stearate by taking swill-cooked dirty oil as raw material
A technology of pentaerythritol stearate and pentaerythritol, which is applied in the field of chemical product preparation, can solve the problems of waste oil safety and environmental protection hazards, and achieve the effect of high purity and high yield
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Embodiment 1
[0019] This is that the method for raw material production pentaerythritol stearate with waste oil comprises the following steps:
[0020] A. Remove the solid matter contained in the waste oil to be treated, then heat it to 70°C, and filter it through a nano-overfrequency vibration membrane group to obtain a waste oil pretreatment liquid;
[0021] B. Put the waste oil pretreatment liquid prepared in step A into a stirrer, add 0.5% concentrated sulfuric acid which accounts for 0.5% of the waste oil pretreatment liquid mass under agitation, stir evenly, heat to 65 ° C, and keep the temperature constant Stirring for 12 hours, then standing for stratification, taking the supernatant to obtain the waste oil pretreatment clear liquid;
[0022] C, the waste oil pretreatment clear liquid that B step is made is put into distillation tower earlier, is 220 ℃ at temperature, and distillation is under the condition of 0MPa in pressure; Fractional distillation at 240°C and a pressure of 0....
Embodiment 2
[0026] This is that the method for raw material production pentaerythritol stearate with waste oil comprises the following steps:
[0027] A. Remove the solid matter contained in the waste oil to be treated, then heat it to 80°C, and filter it through a nano-overfrequency vibration membrane group to obtain a waste oil pretreatment liquid;
[0028] B. Put the waste oil pretreatment liquid prepared in step A into the agitator, add 0.8% concentrated sulfuric acid which accounts for 0.8% of the waste oil pretreatment liquid mass under stirring, stir evenly, heat to 75°C, and keep the temperature constant Stirring for 8 hours, then standing for stratification, taking the supernatant to obtain the waste oil pretreatment clear liquid;
[0029] C. Put the waste oil pretreatment clear liquid obtained in step B into a distillation tower first, and distill at a temperature of 240° C. and a pressure of 0.001 MPa; then transfer the product obtained by distillation to a fractionation tower,...
Embodiment 3
[0033] This is that the method for raw material production pentaerythritol stearate with waste oil comprises the following steps:
[0034] A. Remove the solid matter contained in the waste oil to be treated, then heat it to 75°C, and filter it through a nano-overfrequency vibration membrane group to obtain a waste oil pretreatment liquid;
[0035] B. Put the waste oil pretreatment liquid prepared in step A into a mixer, add concentrated sulfuric acid which accounts for 0.6% of the waste oil pretreatment liquid mass under stirring conditions, stir evenly, heat to 70 ° C, and keep the temperature constant Stirring for 10 hours, then standing for stratification, taking the supernatant to obtain the waste oil pretreatment clear liquid;
[0036] C, the waste oil pretreatment clear liquid that B step is made is put into distillation tower earlier, and temperature is 230 ℃, and pressure is distillation under the condition of 0MPa; Fractional distillation at 245°C and a pressure of 0...
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