Lignin sulfonyl betaine surfactant for oil field and preparation method thereof
A technology of surfactant and sulfonic acid group, which is applied in the field of surfactant preparation to achieve the effect of low cost and enhanced oil recovery
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Embodiment 1
[0019] Embodiment 1: 40g lignin and 6g H 2 o 2 Oxidation at 60°C for 2 hours, then adding 6 g of formaldehyde and 8 g of Na 2 SO 3 Sulfonate at 95°C for 8 hours to obtain oxidized sulfonated lignin; react 9.25g of epichlorohydrin with 21.34g of dodecyldimethyl tertiary amine at 55°C for 3 hours to obtain long-chain fatty quaternary ammonium Salt intermediate: 25.4g of oxidized sulfonated lignin and 33.605g of long carbon chain fatty quaternary ammonium salt intermediate were reacted at 55°C for 3 hours, cooled to room temperature, and lignosulfonate betaine surfactant was prepared.
[0020] After purification, the product was analyzed by infrared spectrum, and the results were as follows: figure 1 Shown in (a, b). Compared with the raw material lignin, the lignin sulfonate betaine product is at 2830cm ‐1 The C-H bond absorption peak at the position is significantly strengthened, indicating that the introduction of higher aliphatic amines increases the methyl and methylene...
Embodiment 2
[0023] Embodiment 2: 40g lignin and 6g H 2 o 2 Oxidation at 60°C for 2 hours, then adding 6 g of formaldehyde and 8 g of Na 2 SO 3 Sulfonate at 95°C for 8 hours to obtain oxidized sulfonated lignin; react 9.25g of epichlorohydrin with 24.15g of tetradecyldimethyl tertiary amine at 55°C for 3 hours to obtain long-chain fatty quaternary ammonium Salt intermediate: 25.4g of oxidized sulfonated lignin obtained and 36.69g of long carbon chain fatty quaternary ammonium salt intermediate were reacted at 55°C for 3 hours and cooled to room temperature to prepare lignosulfonate betaine surfactant.
[0024] Formation water from No. 6 Plant in Daqing (total salinity 5617mg / L, the same below) was used to prepare 0.4% oil-displacing agent monomer (mass fraction), taking Daqing dehydrated crude oil as the object, and the oil-water interfacial tension measured at 45°C was 1.36×10 ‐3 mN / m; North China formation water (total salinity 10789mg / L) is used to prepare oil displacement agent monome...
Embodiment 3
[0025] Embodiment 3: 40g lignin and 6g H 2 o 2 Oxidation at 70°C for 1 hour, then adding 6 g of formaldehyde and 8 g of Na 2 SO 3 Sulfonate at 80°C for 8 hours to obtain oxidized sulfonated lignin; react 9.25g of epichlorohydrin with 24.15g of tetradecyldimethyl tertiary amine at 55°C for 3 hours to obtain long-chain fatty quaternary ammonium salt intermediate. The obtained 25.4g oxidized sulfonated lignin and 43.36g long carbon chain fatty quaternary ammonium salt intermediate were reacted at 55° C. for 3 hours, and cooled to room temperature to prepare lignosulfonate betaine surfactant.
[0026] Formation water from the No. 6 Plant in Daqing (total salinity 5617mg / L, the same below) was used to prepare oil-displacing agent monomers containing (mass fraction) 0.4%. Taking Daqing dehydrated crude oil as the object, the oil-water interfacial tension measured at 45°C was 3.42×10 ‐3 mN / m; use North China formation water (total salinity 10789mg / L) to prepare (mass fraction) oi...
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