Preparation method of amide copolymer hydrate kinetic inhibitor

Abstract

The invention discloses a preparation method of an amide copolymer hydrate kinetic inhibitor, and belongs to the technical field of preparation of chemical engineering reagents. The preparation method is concretely characterized in that the AM / AN / VCL ternary copolymer hydrate kinetic inhibitor with the molecular weight reaching 300,000-500,000 is synthesized from acrylamide (AM), acrylonitrile (AN) and vinyl caprolactam (VCL) in anoxic environment with azodiisobutyronitrile as an initiator and nonionic surfactant-containing deionized water as a disperse medium. The method has the characteristics of simple production process and low production cost, and the prepared inhibitor has the advantages of low injection dosage and long inhibition time.

Description

technical field

[0001] The invention relates to a preparation method of a natural gas hydrate kinetic inhibitor, in particular to a preparation method of an amide copolymer hydrate kinetic inhibitor. Background technique

[0002] Natural gas hydrate is a kind of crystal with a cage structure, which is similar to ice in appearance. When there is water in the natural gas pipeline and it is in a low temperature and high pressure environment, water molecules and natural gas molecules crystallize and nucleate. Natural gas hydrates can easily cause blockage of pipelines and affect the normal transportation of natural gas, and even lead to safety accidents in severe cases. In order to suppress the formation of hydrates, the method of injecting thermodynamic inhibitors is often used. This method has high toxicity, large injection volume, and huge equipment, resulting in high production costs and serious environmental pollution, and at the same time, it is easy to affect the tempera...

Examples

Embodiment 1

[0024] Weigh 200g of deionized water, pour it into a four-neck round bottom flask, connect it to a nitrogen atmosphere device, and temporarily seal the other mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 1 g of octylphenol polyoxyethylene ether nonionic surfactant, add it into the deionized water, and stir for 10 minutes. Weigh 3.5g, 1.5g, and 4.8g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in turn under a nitrogen atmosphere. Adjust the temperature of the water bath to 80° C., and add a mixture of 0.15 g of azobisisobutyronitrile and 0.15 g of azobisisoheptanonitrile 5 times within 5 hours under stirring. Continue the reaction for 3 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to room temperature. The reaction solution was washed with excess n-hexane, filtered to obtain a pr...

Embodiment 2

[0027] Weigh 250g of deionized water, pour it into a four-neck round-bottomed flask, connect it to a nitrogen atmosphere device, and temporarily seal the remaining mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 0.6 g of nonylphenol polyoxyethylene ether and 0.6 g of n-octanol polyoxyethylene ether nonionic surfactant, add them into deionized water, and start stirring for 10 minutes. Weigh 4.8g, 2.3g, and 6g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in sequence under a nitrogen atmosphere. Adjust the temperature of the water bath to 80°C, add 0.2 g of azobisisobutyronitrile, 0.2 g of dimethyl azobisisobutyrate and 0.2 g of azoisobutyronitrile formamide in 5 portions within 5 hours while stirring mixture. Continue to react for 5 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to r...

Embodiment 3

[0030] Weigh 300g of deionized water, pour it into a four-neck round bottom flask, connect it to a nitrogen atmosphere device, and temporarily seal the other mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 0.5g of octylphenol ethoxylate, 0.5g of nonylphenol ethoxylate and 0.5g of n-octylphenol ethoxylate nonionic surfactant, add them into deionized water, and start stirring for 10 minutes. Weigh 7g, 2.6g, and 8.6g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in turn under a nitrogen atmosphere. Adjust the temperature of the water bath to 80°C, add 0.17g of azobisisobutyronitrile, 0.17g of azobisisoheptanonitrile, 0.17g of dimethyl azobisisobutyrate and 0.17 g of azoisobutyronitrile formamide mixture. Continue to react for 5 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to room tem...

technical field

[0001] The invention relates to a preparation method of a natural gas hydrate kinetic inhibitor, in particular to a preparation method of an amide copolymer hydrate kinetic inhibitor. Background technique

[0002] Natural gas hydrate is a kind of crystal with a cage structure, which is similar to ice in appearance. When there is water in the natural gas pipeline and it is in a low temperature and high pressure environment, water molecules and natural gas molecules crystallize and nucleate. Natural gas hydrates can easily cause blockage of pipelines and affect the normal transportation of natural gas, and even lead to safety accidents in severe cases. In order to suppress the formation of hydrates, the method of injecting thermodynamic inhibitors is often used. This method has high toxicity, large injection volume, and huge equipment, resulting in high production costs and serious environmental pollution, and at the same time, it is easy to affect the tempera...

Examples

Embodiment 1

[0024] Weigh 200g of deionized water, pour it into a four-neck round bottom flask, connect it to a nitrogen atmosphere device, and temporarily seal the other mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 1 g of octylphenol polyoxyethylene ether nonionic surfactant, add it into the deionized water, and stir for 10 minutes. Weigh 3.5g, 1.5g, and 4.8g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in turn under a nitrogen atmosphere. Adjust the temperature of the water bath to 80° C., and add a mixture of 0.15 g of azobisisobutyronitrile and 0.15 g of azobisisoheptanonitrile 5 times within 5 hours under stirring. Continue the reaction for 3 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to room temperature. The reaction solution was washed with excess n-hexane, filtered to obtain a pr...

Embodiment 2

[0027] Weigh 250g of deionized water, pour it into a four-neck round-bottomed flask, connect it to a nitrogen atmosphere device, and temporarily seal the remaining mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 0.6 g of nonylphenol polyoxyethylene ether and 0.6 g of n-octanol polyoxyethylene ether nonionic surfactant, add them into deionized water, and start stirring for 10 minutes. Weigh 4.8g, 2.3g, and 6g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in sequence under a nitrogen atmosphere. Adjust the temperature of the water bath to 80°C, add 0.2 g of azobisisobutyronitrile, 0.2 g of dimethyl azobisisobutyrate and 0.2 g of azoisobutyronitrile formamide in 5 portions within 5 hours while stirring mixture. Continue to react for 5 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to r...

Embodiment 3

[0030] Weigh 300g of deionized water, pour it into a four-neck round bottom flask, connect it to a nitrogen atmosphere device, and temporarily seal the other mouth. Place the flask in a water bath with a constant temperature of 65°C, open the nitrogen valve for 20 minutes, and remove the oxygen in the system. Weigh 0.5g of octylphenol ethoxylate, 0.5g of nonylphenol ethoxylate and 0.5g of n-octylphenol ethoxylate nonionic surfactant, add them into deionized water, and start stirring for 10 minutes. Weigh 7g, 2.6g, and 8.6g of pure monomers AM, AN, and VCL, respectively, and add them to the flask in turn under a nitrogen atmosphere. Adjust the temperature of the water bath to 80°C, add 0.17g of azobisisobutyronitrile, 0.17g of azobisisoheptanonitrile, 0.17g of dimethyl azobisisobutyrate and 0.17 g of azoisobutyronitrile formamide mixture. Continue to react for 5 h, adjust the water bath to room temperature, and wait until the reaction solution is completely cooled to room tem...