Preparation method of glyceryl biological fuel additives
A technology for biofuels and additives, which is applied in the preparation of fuel additives, organic compounds, and dehydration of hydroxyl-containing compounds to prepare ethers. It can solve the problems of low cetane number, insignificant effect, and high density. Improved combustion performance and uniform mixing effect
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Embodiment 1
[0027] Embodiment 1: figure 1 It is the technological process of the preparation method of the glycerol-based biofuel additive, and the specific steps are as follows: Step 1: Mix 39.5g of tert-butanol, 12.6g of glycerin, 1.5g of D002 ion exchange resin and 1.5g of color-changing silica gel in an autoclave. Step 2 Seal the autoclave. Before the reaction starts, replace the air in the autoclave with nitrogen gas, increase the nitrogen pressure until the initial pressure in the autoclave is 1MPa, control the temperature of the etherification reaction at 90°C, and keep the self-boosting pressure in the autoclave during the reaction. Time 8h.
[0028] figure 2 It is the reaction formula of the etherification process, wherein ROH represents a lower alcohol, and A, B, and C represent glycerol-derived monoglycerol, diglyceride, triglyceride and isomers.
[0029] Step 3 After the reaction is over, cool down the pressure vessel with an ice-water bath, then vent the gas in the vesse...
Embodiment 2
[0038] Example 2: Step 1 Mix 25.6g of methanol, 9.2g of glycerin, 0.9g of p-toluenesulfonic acid catalyst supported on activated carbon and 1.5g of activated alumina in an autoclave.
[0039] Step 2 Seal the autoclave. Before the reaction starts, replace the air in the autoclave with helium gas, increase the helium pressure until the initial pressure in the autoclave is 1MPa, control the reaction temperature at 30°C, and the reaction time is 10h.
[0040] Step 3 is the same as Step 3 in Example 1.
[0041]Step 4 Add the liquid obtained after distilling off the alcohol in step 3 to the acylation reaction device, and add 18.0 g of acetic anhydride dropwise to carry out the acylation reaction. The acylation temperature is 140° C. and the acylation time is 1 h.
[0042] Step 5 After adding anhydrous sodium carbonate to neutralize to neutrality, filter to recover the catalyst and water-absorbing agent, and distill the liquid mixture under reduced pressure to obtain the target pro...
Embodiment 3
[0044] Example 3: Step 1 Mix 23.0g of ethanol, 9.2g of glycerin, 2.6g of HZSM-5 zeolite catalyst and 3.2g of water-absorbent resin in an autoclave.
[0045] Step 2 Seal the autoclave, replace the air in the autoclave with neon gas, the initial pressure in the autoclave is 0 MPa, the reaction temperature is controlled at 85°C, and the reaction time is 8h.
[0046] Step 3 is the same as Step 3 in Example 1.
[0047] Step 4 Add the liquid obtained after distilling off the alcohol in step 3 into the acylation reaction device, and add 21.4 g of acetic anhydride dropwise to carry out the acylation reaction. The acylation temperature is 60° C. and the acylation time is 4 hours.
[0048] Step 5 is the same as Step 5 of Example 1.
[0049] through Gas chromatographic analysis showed that the final hydroxyl conversion rate was 98.2%.
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