Preparation method for low-viscosity poly-alpha-olefin synthetic oil
An olefin synthetic oil, low viscosity technology, applied in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, production of liquid hydrocarbon mixtures, etc., can solve the problems of easily causing corrosion, large energy consumption, etc., reducing operating costs, realizing recovery, and operation. easy effect
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[0053] See figure 1 As shown, the preparation method of low-viscosity poly-α-olefin synthetic oil of the present invention specifically includes the following steps:
[0054] (1) The α-olefin raw material is dehydrated and refined through a molecular sieve fixed bed (ie, molecular sieve dehydration tower 1), so that the water content of the raw material is ≤10ppm;
[0055] (2) Feed the α-olefin raw material and recovered monomers and dimers (obtained from the following step (5)) into the reactor 2, and add the recovered complex catalyst (obtained from the following step (4)) And supplementary supplementary co-catalyst (water content ≤10ppm), filled with BF 3 To react, the co-catalyst and BF 3 Combine to obtain a complex catalyst.
[0056] (3) Flashing treatment of polymerization product: the reaction product is flashed through the flash evaporator 3 to obtain the first oil phase and gas phase, the catalyst activity is terminated, and BF is recovered 3 ,Recycling.
[0057] Decompress...
Example
[0063] Examples 1~6
[0064] Use dehydrated and refined 1-decene (water content of 8ppm) as raw material to synthesize low-viscosity PAO, use butanol (water content of 9ppm) as a co-catalyst, and the ratio of butanol to 1-decene is 1:100 (material Amount), at 30℃, BF 3 The reaction was carried out under the pressure of 0.2MPa and the reaction time was 1h. The obtained reaction product was subjected to flashing treatment, and the flashing test was carried out with different flashing conditions (see Table 1, Examples 1-6) to obtain the first oil phase The gas phase, the flash gas, is pressurized and returned to the reactor, and the first oil phase enters the precipitator for precipitation treatment.
[0065] Table 1 Effect of flash evaporation process on BF 3 Removal effect
[0066]
Example
[0067] Examples 7-11:
[0068] Using the first oil phase of Example 3 as the precipitation feed (ie precipitation oil), the precipitation tests were carried out using different precipitation conditions (see Table 2, Examples 7-11) to obtain the second oil phase of the upper layer and the lower layer After the gas-liquid separation of the second oil phase, the resulting gas and flash steam are combined and compressed, and the remaining oil phase (ie degassed oil) undergoes alkaline washing and water washing to obtain water-washed oil (ie clean intermediate product). The fluorine content of the washing oil, and the composition of the lower catalyst layer were analyzed, as shown in Table 2.
[0069] Table 2 Settlement and separation of BF 3 Removal effect
[0070]
[0071] The intermediate product is continuously subjected to vacuum distillation to separate monomers and dimers, and then hydrogenates and is saturated to obtain poly-α-olefin synthetic oil.
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