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CN-117839275-B - Defoaming agent and defoaming method thereof in petrochemical industry

CN117839275BCN 117839275 BCN117839275 BCN 117839275BCN-117839275-B

Abstract

The invention belongs to the technical field of preparation of defoamers, and particularly relates to a defoamer and a defoaming method thereof in petrochemical industry. The defoaming agent is a silicone oil defoaming agent, and comprises the following raw materials, by weight, 100-120 parts of simethicone, 6-9 parts of silica sol, 3-4 parts of chitosan and 10-12 parts of emulsifying agent, wherein the simethicone is treated by allyl glycidyl ether and then grafted with tyrosine with an isoelectric point of 5.66, the silica sol is treated by ammonia water and then subjected to surface modification by hexamethyldisilazane, and the pH of the defoaming agent is 7.0. The product obtained by the invention has the advantages of high defoaming efficiency and short defoaming time.

Inventors

  • GU XIAOFENG
  • YANG LIN
  • CHEN LEI
  • CHEN YANXIN
  • LIANG KAI

Assignees

  • 江苏太湖新材料技术研发有限公司

Dates

Publication Date
20260508
Application Date
20230530

Claims (10)

  1. 1. The defoaming agent is characterized by being silicone oil emulsion, wherein the silicone oil emulsion comprises the following raw materials in parts by weight: 100-120 parts of simethicone, 6-9 parts of silica sol, 3-4 parts of chitosan, 10-12 parts of emulsifier and 110-130 parts of deionized water; after the dimethyl silicone oil is treated by allyl glycidyl ether, tyrosine with isoelectric point of 5.66 is grafted; The silica sol is firstly treated by ammonia water and then subjected to surface modification by hexamethyldisilazane; The pH of the defoamer was 7.0.
  2. 2. The defoamer of claim 1, wherein the viscosity of the simethicone ranges from 200 to 100000 centistokes.
  3. 3. The defoamer of claim 1, wherein the defoamer further comprises 2-3% of a solubilizer by mass of the dimethicone.
  4. 4. A defoamer of claim 3, wherein the solubilizing agent is selected from the group consisting of one or more of octanol, propanol, and ethanol.
  5. 5. The defoamer of claim 1, wherein the emulsifier is compounded by tween-series emulsifiers and span-series emulsifiers in a mass ratio of 1-1.5:1.
  6. 6. The defoamer of claim 5, wherein the tween-series emulsifier is selected from any of tween 20, tween 40, and tween 60.
  7. 7. The defoamer of claim 5, wherein Span-series emulsifier is selected from any of Span 40, span 60, and Span 80.
  8. 8. The defoamer of claim 1, further comprising 3-4% by mass of a dimethicone soluble starch, wherein the soluble starch is modified by emulsifying by mixing Span 60 with tween 60.
  9. 9. A method of defoaming in petrochemical industry, characterized in that the defoaming agent according to any one of claims 1 to 8 is applied, the defoaming method comprising the steps of: (1) The preparation of the defoaming agent comprises the steps of stirring the prepared tyrosine grafted modified dimethyl silicone oil and the prepared treated modified silica sol at 150 ℃, and then cooling to room temperature to obtain a silica paste compound; (2) And (3) adding the defoaming agent prepared in the step (1) into a heating box for heating, and then injecting the heated defoaming agent into a petrochemical device for defoaming.
  10. 10. The method for defoaming in petrochemical industry according to claim 9, wherein the conditions of the heating tank in the step (2) include a temperature of 40-50 ℃ and a time of 40-60min.

Description

Defoaming agent and defoaming method thereof in petrochemical industry Technical Field The invention belongs to the technical field of preparation of defoamers, and particularly relates to a defoamer and a defoaming method thereof in petrochemical industry. Background The crude oil has complex components, so the processing technology is very complex, foam is generated in both the delayed coking and aromatic hydrocarbon extraction devices, and the foam is generated easily to cause the fluctuation of the device production. However, the main defoamer is an organic silicon series defoamer at present, and the defoamer of the independent system has the problems of low defoaming efficiency and long defoaming time. Disclosure of Invention The invention aims to solve the technical problems of low defoaming efficiency and long defoaming time of the existing defoamer. The invention aims to provide an antifoaming agent. It is another object of the present invention to provide a defoaming method in petrochemical industry. The above object of the present invention is achieved by the following technical scheme: the invention provides a defoaming agent which is silicone oil emulsion, wherein the silicone oil emulsion comprises the following raw materials in parts by weight: 100-120 parts of simethicone, 6-9 parts of silica sol, 3-4 parts of chitosan, 10-12 parts of emulsifier and 110-130 parts of deionized water; after the dimethyl silicone oil is treated by allyl glycidyl ether, tyrosine with isoelectric point of 5.66 is grafted; The silica sol is firstly treated by ammonia water and then subjected to surface modification by hexamethyldisilazane; The pH of the defoamer was 7.0. According to the technical scheme, firstly, the allyl glycidyl ether is used for treating the simethicone, so that tyrosine with an isoelectric point of 5.66 can be grafted on a simethicone molecular chain, as the pH value of a defoaming agent is 7.0, tyrosine is negatively charged, polycations of chitosan can be adsorbed, the simethicone molecular chain is attached to the chitosan through electrostatic action, and because the chitosan has adsorptivity, foams in a system can be adsorbed, so that the simethicone can be rapidly spread on a foam membrane, the foam membrane is broken to play a role of rapid defoaming, simultaneously, amino groups in the simethicone grafted by the amino acids can form hydrogen bonds with hydroxyl groups in the silicon dioxide modified by the hexamethyldisilazane, when the simethicone is rapidly spread on the foam membrane, the hydrophobic silicon dioxide can be locally immersed on the surface of the air bubble, so that the local surface tension of the air bubble is reduced, and then the effect of solid particles is improved, and the silicon dioxide is broken through the ammonia water. Further, the viscosity of the simethicone ranges from 200 to 100000 centistokes. Further, the defoamer also comprises a solubilizer accounting for 2-3% of the mass of the simethicone. Further, the solubilizing agent is selected from one or more of octanol, propanol and ethanol. According to the technical scheme, the solubilizer is added to promote dissolution of the surface active agent layer of the foam so as to reduce the concentration of the surface active agent of the surface layer, and meanwhile, the solubilizer is dissolved into the surface active agent adsorption layer to reduce the intermolecular tightness of the surface active agent, so that the stability of the foam is weakened. Further, the emulsifier is compounded by a tween series emulsifier and span series emulsifier according to the mass ratio of 1-1.5:1. Further, the tween-series emulsifier is selected from any one of tween 20, tween 40 and tween 60. Further, span-series emulsifier is selected from any one of Span 40, span 60 and Span 80. Further, the defoamer also comprises 3-4% of soluble starch by mass of the simethicone, and the soluble starch is emulsified and modified by mixing Span 60 and tween 60. The invention also provides a defoaming method in petrochemical industry, which comprises the following steps: (1) Adding chitosan into deionized water, adding an emulsifying agent for ultrasonic dispersion, and then adding the silicone paste compound, a solubilizer and soluble starch for continuous stirring to form emulsion, thus obtaining the defoaming agent; (2) And (3) adding the defoaming agent prepared in the step (1) into a heating box for heating, and then injecting the heated defoaming agent into a petrochemical device for defoaming. According to the technical scheme, the chitosan is added into deionized water and then added into the emulsifier for ultrasonic dispersion, so that the chitosan is promoted to be dissolved in a system, and a better defoaming effect is exerted. Further, the conditions of the heating box in the step (2) comprise the temperature of 40-50 ℃ and the time of 40-60min. According to the technical scheme, the emulsifier is heated by the heatin