Ester lubricant base oil and synthesis method thereof
A technology for lubricating base oil and synthesis method, applied in the directions of lubricating compositions, chemical instruments and methods, base materials, etc., can solve the problems of equipment corrosion, many by-products, increase production costs, etc., and achieve the reduction of sewage discharge, The effect of speeding up the reaction and reducing the cost of raw materials
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[0037] A kind of synthetic method of ester lubricating oil base oil, comprises the steps:
[0038] 1) Using an acidic solid as a catalyst, react with an organic acid or an organic alcohol as a raw material at 120-180°C for 2 to 6 hours to generate a crude ester;
[0039] 2) filtering the gained crude ester, reclaiming the acidic solid catalyst for reuse;
[0040] 3) Distill the crude ester obtained after filtration to remove excess organic acid; the vacuum distillation conditions are 150-250°C, 10-1kPa residual pressure; then perform molecular distillation to further remove incompletely reacted intermediate products , to obtain a preliminary refined ester; the molecular distillation conditions are 250-300°C, 0.1-0.01kPa; the separated organic acid can be recycled;
[0041] 4) Depickling the obtained preliminary refined ester with an anion exchange resin to reduce the acid value of the product to below 0.1mgKOH / g, and then dehydrating and drying through vacuum distillation to ...
Embodiment 1 3
[0042] The synthesis of embodiment 1 trimethylolpropane hexanoate
[0043] Put trimethylolpropane and hexanoic acid in a molar ratio of 1:3.2 into the reactor, add an appropriate amount of solvent, add an acidic solid catalyst with a total weight of 0.1% of acid alcohol under stirring, heat up to 120-130°C for 3 hours, and then raise the temperature To 140-150°C, continue the reaction for 3 hours, synthesize crude ester, filter and recover the acidic solid catalyst, distill the excess hexanoic acid under reduced pressure at 150-200°C, 5kPa residual pressure, the recovered hexanoic acid can be used as raw material again, at 250 ~300°C, molecular distillation intermediate product at 0.1KPa, the preliminary refined ester enters the weakly basic macroporous anion exchange resin (D301R) column for further deep deacidification until the acid value is reduced to below 0.1mgKOH / g, and finally in Dry under reduced pressure at normal temperature of 2.5-3KPa to obtain trimethylolpropane ...
Embodiment 2
[0045] The synthesis of embodiment 2 pentaerythritol hexanoate
[0046]Pentaerythritol and hexanoic acid (recovered partly from Example 1) are dropped into the reactor in a molar ratio of 1: 4.2, an appropriate amount of solvent is added, and an acidic solid catalyst (recovered from Example 1) of 0.1% of the total weight of acid alcohol is added under stirring, and the temperature is raised to React at 130-140°C for 3 hours, then increase the temperature to 150-160°C, and continue the reaction for 3 hours to synthesize crude ester, filter and recover the acidic solid catalyst, distill excess hexanoic acid under reduced pressure at 150-200°C and 5kPa residual pressure, and recover The hexanoic acid can be used again as a raw material, and the intermediate product is molecularly distilled at 250-300°C and 0.1KPa, and the preliminary refined ester enters a weakly basic macroporous anion exchange resin (D301R) column for further deep deacidification until the acid value Reduce to ...
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