Hydrophobic silica gel for oil vapor recovery
A hydrophobic and silica gel technology, applied in the direction of silicon oxide, silicon dioxide, silicon compounds, etc., can solve the problems of multiple operations, complicated processing process, and small sample particle size, so as to prevent the clogging of the vacuum pump body and achieve good desorption effect. The effect of large specific surface area
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preparation example Construction
[0042] The invention provides a method for preparing hydrophobic silica gel for oil and gas recovery, said method comprising the steps of:
[0043] The first step is to use water-absorbing silica gel particles as the raw material silica gel particles, and heat and dry them at high temperature;
[0044] In the second step, the raw silica gel after drying is mixed with a pre-dried organic solvent, a surface modifier is added, and the reaction is stirred;
[0045] In the third step, after the stirring reaction in the second step is completed, the reaction product is suction-filtered, and washed with a dry solvent several times;
[0046] The fourth step is drying the reaction product washed in the third step to obtain the hydrophobic silica gel.
[0047] Wherein, it is further preferred that the preparation method of the hydrophobic silica gel only consists of the above four steps.
[0048] Wherein, the water-absorbing silica gel particles can be any water-absorbing silica gel p...
Embodiment 1
[0154] In this example, B-type water-absorbing granular silica gel produced by Qingdao Ocean Chemical Factory is selected as the raw material, with a particle size of 4 mm and a specific surface area of 653.57 m 2 / g, the pore volume is 0.76cm 3 / g, the average pore diameter is 4.76nm. Take 500g of raw silica gel dried in an oven at 120°C for 2 hours, put it in a three-necked flask, add 800g of chloroform and start stirring, slowly drop in the modifier trimethylchlorosilane, trimethylchlorosilane and raw materials The mass ratio of silica gel is 1:5, an acid absorption device is connected to the outlet of the three-necked bottle, water is used as the acid absorption agent, and the reaction is carried out at a constant temperature of 30° C. for 2 hours. After the reaction, filter with suction, rinse with 600mL of chloroform several times, and finally rinse with 600mL of dry methanol and 40mL of triethylamine and filter with suction. The sample is vacuum-dried at 90°C for 4 h...
Embodiment 2
[0156] In this example, the process for preparing hydrophobic silica gel is the same as in Example 1, except that the mass ratio of trimethylchlorosilane to silica gel is 1:10, and the reaction time is 3 hours at a constant temperature of 30°C. The rinse and vacuum drying steps are also the same as in Example 1, and the pore structure parameters of the prepared hydrophobic silica gel are shown in Table 1.
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