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Di(2-ethylhexyl)phosphate
Time2020-7-10 10:01:26Page view267

Chinese name: bis(2-ethylhexyl) phosphate
English name: Di(2-ethylhexyl)phosphate
Chinese alias: di (2-ethylhexyl) phosphate, diisooctyl phosphate dioctyl phosphate, diisooctyl phosphate, bis (2-ethylhexyl) phosphate diisooctyl phosphate
2-ethylhexyl-2'-ethylhexyl phosphate, extractant P-204 di(2-ethylhexyl) phosphate (P-204), di(2-ethylhexyl) phosphate di-( 2-ethylhexyl) phosphate,
Octyl phosphate, rare earth metal extractant, bis(2-ethylhexyl) hydrogen phosphate, bis(2-ethylhexyl) phosphate, 97%
English alias: 225-614-8; phosphoric acid, bis(2-ethylhexyl) ester, potassium salt (1:1); Potassium bis(2-ethylhexyl) phosphate; ammonium bis(2-ethylhexyl) phosphate; 2-ethylhexyl hydrogen phosphate
Di (2-ethylhexyl) phosphate is a colorless transparent viscous liquid, CAS number is 298-07-7, molecular formula is C8H18O4P, molecular weight is 209.2004, mainly used as rare earth metal extractant, wetting agent and surface activity The raw material of the agent, plastic plasticizer.
Storage method
It should be stored in a dry, cool and ventilated place indoors, and should be protected from violent impact and rain during transportation. In case of high heat, open flame or contact with oxidant, there is a danger of burning.
resolve resolution
The esterification reaction between 2-ethylhexanol and phosphorus oxychloride produces diisooctyl phosphate, which is hydrolyzed with an alkaline solution to obtain a sodium salt, which is obtained by acidification with sulfuric acid.
1. Esterify in a glass-lined reaction pot, add phosphorus oxychloride first, stir and cool, add 2-ethyl n-alcohol dropwise below 10C, continue stirring for 1h after the addition, slowly increase the temperature to 20-45C and discharge hydrogen chloride 3h, then increase the temperature to 45-50C, pump the hydrogen chloride gas with a water jet pump for 3h, and finally increase the temperature to 50-60C, and discharge the hydrogen chloride gas under a vacuum of 80kPa for 3h.

2. Hydrolysis Add 20% liquid caustic soda to the hydrolysis pot, stir, drop the above-mentioned esterified product below 60 , heat up to 80-90 , keep it for 1h, let stand for 15min, and put the lower-layer wastewater away. Add 30% liquid caustic soda under stirring, raise the temperature to 120 C and reflux for 1 h, let stand for 15 min, the lower caustic solution is released and recovered. The materials in the hydrolysis pot are washed with 3% alkaline water at 80-90 for acidification.

3. Add 10% sulfuric acid to the acidified hydrolysate, acidify at a temperature of 50-60, acidify for 1h, and remove the lower layer of acid water. Wash with water. Finally, it is heated to 110-120C in the membrane separation tower to remove water and low boilers to obtain the finished product. Industrial purity 90%. Raw material consumption quota: 2-ethylhexanol 1100kg/t, phosphorus oxychloride 590kg/t....

 
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