A kind of novel crude oil demulsifier and preparation method thereof
A crude oil demulsifier, a new type of technology, applied in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve the problems of poor environmental friendliness and secondary pollution of demulsifiers, achieve strong competitive adsorption capacity, use The effect of good safety and wide range of sources
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Embodiment 1
[0041] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethanol monomethyl ether graft, concrete steps are as follows:
[0042] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) dissolved in 40mL of 10% acetic acid aqueous solution, added 160mL of methanol to dilute, added 5.9mmol of n-butyric anhydride under stirring condition, left at room temperature for 24h, then added 260mL of acetone was used as precipitant, and the precipitate was washed three times with methanol and ether respectively, and freeze-dried to obtain white water-soluble solid N-n-butyrylated chitosan (A 4 CS).
[0043] Wherein the consumption of n-butyric anhydride is 0.5 times of the amount of amino substance contained in chitosan, and concrete calculation method is as follows:
[0044] The sugar unit of chitosan is glucosamine residue, and the molecular weight of this residue (sugar unit of chitosan) is 161, and the am...
Embodiment 2
[0049] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethanol monomethyl ether graft, concrete steps are as follows:
[0050] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, deacetylation degree>95%, viscosity 100~200mPa·s) was dissolved in 40mL 10% acetic acid aqueous solution, added 160mL methanol to dilute, under stirring condition, add n-hexanoic anhydride 5.9mmol according to the amount of amino substance 0.5 times, in Placed at room temperature for 24 hours, 260 mL of acetone was added as a precipitant, the precipitate was washed three times with methanol and ether, and freeze-dried to obtain a white water-soluble solid N-n-hexanoylated chitosan (A 6 CS). Wherein the calculation method of n-hexanoic anhydride consumption is described in step (1) with reference to embodiment 1.
[0051] (2) Carboxymethylation of N-n-hexanoylated chitosan: get 1.128g A 6 Add 100mL of distilled water to CS in a 250mL three-neck flask, and wait for it t...
Embodiment 3
[0055] Prepare the N-n-butyrylation carboxymethyl chitosan of polyethanol monomethyl ether graft, concrete steps are as follows:
[0056] (1) Synthesis of N-acylated chitosan: 2g chitosan (CS) (M w =179.17kDa, degree of deacetylation>95%, viscosity 100-200mPa·s) dissolved in 40mL of 10% acetic acid aqueous solution, added 160mL of methanol for dilution, and added 5.9mmol of n-octylic anhydride according to 0.5 times the amount of amino substances under stirring conditions, After standing at room temperature for 24 h, 260 mL of acetone was added as a precipitating agent, and the precipitate was washed three times with methanol and ether, and freeze-dried to obtain a white water-soluble solid N-octanoyl chitosan (A 8 CS). Wherein the calculating method of n-octanoic anhydride consumption is described with reference to step (1) among the embodiment 1.
[0057] (2) Carboxymethylation of N-octanoyl chitosan: get 1.256g A 8 Add 100mL of distilled water to CS in a 250mL three-neck...
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