CN-121971890-A - Amine liquid defoamer and preparation method and application thereof

Abstract

The invention relates to an amine liquid defoamer and a preparation method and application thereof, and belongs to the technical field of defoamers. The defoaming agent is prepared by carrying out amination modification on polyether polyol to obtain aminated modified polyether with amino at the tail end, grafting fluorine-containing monomers onto an aminated modified polyether molecular chain to obtain a defoaming agent intermediate, and finally, compounding the intermediate with deionized water; the preparation process of the invention is carried out by adopting a continuous reaction kettle and a continuous blending kettle and combining DCS and SIS systems in linkage control, and the product quality is stable and controllable. The obtained defoaming agent has good compatibility with amine liquid, high defoaming speed, lasting foam inhibition and environmental friendliness, and is suitable for eliminating and inhibiting foam of an amine liquid system in industries such as natural gas purification, oil refining and the like.

Inventors

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

Assignees

• 江苏太湖新材料控股有限公司

Dates

Publication Date

20260505

Application Date

20260304

Claims (10)

1. 1. The preparation method of the amine liquid defoamer is characterized by comprising the following steps: S1, preparing aminated modified polyether, namely dissolving polyether polyol in absolute ethyl alcohol, reacting with an amination agent for 4-6 hours at 80-90 ℃ in the presence of a catalyst, and distilling under reduced pressure after the reaction to obtain the aminated modified polyether; S2, preparing fluorine-containing monomer grafted aminated modified polyether, namely under the linkage control of DCS and SIS systems, reacting the aminated modified polyether obtained in the S1 and the fluorine-containing monomer in a catalyst and an organic solvent at 60-80 ℃ for 4-6 hours, and purifying after the reaction to obtain an amine liquid defoamer intermediate; S3, compounding, namely stirring and dispersing the intermediate of the amine liquid defoamer obtained in the step S2 and deionized water for 30-60min at 40-50 ℃ to realize continuous mixing of materials; s4, post-processing, namely continuously feeding the mixed materials into an online detection unit, continuously packaging and warehousing through an automatic packaging line after the mixed materials are detected to be qualified, and processing according to a 'unqualified product control program' when the mixed materials are detected to be unqualified, so that all products are ensured to be qualified.
2. 2. The method for preparing an amine liquid defoamer according to claim 1, wherein the polyether polyol in S1 is polyoxyethylene-polyoxypropylene block polyether, and the number average molecular weight is 2000-5000.
3. 3. The method for preparing an amine liquid defoamer according to claim 1, wherein the amination agent in S1 is diethylenetriamine or triethylenetetramine, and the molar ratio of the polyether polyol to the amination agent is 1:1.2-1.5.
4. 4. The method for preparing an amine liquid defoamer according to claim 1, wherein the catalyst in S1 is p-toluenesulfonic acid, and the amount of the catalyst is 0.8-1.2% of the mass of the polyether polyol.
5. 5. The method for preparing the amine liquid defoamer according to claim 1, wherein the fluorine-containing monomer in the S2 is at least one of hexafluorobutyl acrylate, trifluoroethyl methacrylate, dodecafluoroheptyl methacrylate and heptadecafluorodecyl methacrylate, and the molar ratio of the fluorine-containing monomer to the aminated modified polyether is 0.8-1.5:1.
6. 6. The method for preparing an amine liquid defoamer according to claim 1, wherein the catalyst in S2 is triethylamine, and the dosage of the catalyst is 0.5-2% of the total mass of the aminated modified polyether and the fluorine-containing monomer.
7. 7. The method for preparing the amine liquid defoamer according to claim 1, wherein the mass ratio of the amine liquid defoamer intermediate to deionized water in the step S3 is 4:1.
8. 8. The method for preparing the amine liquid defoamer according to claim 1, wherein the detection unit in the step S4 comprises the steps of content of effective matters, pH value, defoaming time of the amine liquid after the defoamer is added, defoaming height and stability of the amine liquid after the defoamer is added, automatic filling and dynamic weighing, and a net content error is +/-0.5 kg.
9. 9. An amine liquid defoamer produced by the production process according to any one of claims 1 to 8.
10. 10. Use of an amine liquid defoamer according to any of claims 1-8 in a natural gas desulfurization, refinery chemical or coal chemical amine liquid system.

Description

Amine liquid defoamer and preparation method and application thereof Technical Field The invention relates to the technical field of defoamers, in particular to an amine liquid defoamer and a preparation method and application thereof. Background Amine solutions (typically alkanolamine solutions) are used as efficient gas desulfurization and decarbonization solvents in a wide range of applications in the industrial fields of natural gas purification, oil refining, coal chemical industry, ammonia synthesis, and the like. However, in actual operation, amine liquid systems are extremely prone to producing large amounts of stable foam. Foaming of amine liquid is one of the key problems that lead to unstable operation of the desulfurization device, reduced processing capacity, aggravated loss of amine liquid and even unplanned production stoppage. The foam is generated mainly by gathering hydrocarbons, solid particles, degradation products (such as heat stable salts), corrosion inhibitors and other surface active substances carried by the raw material gas at a gas-liquid interface, so that the surface tension of the amine liquid is obviously reduced. To inhibit and eliminate amine liquid foaming, industry has generally relied on the addition of defoamers. Currently, amine liquid defoamers are mainly classified into silicon, polyether, composite and the like. Although the traditional silicon defoamer (such as polydimethylsiloxane) has quick initial defoaming, the traditional silicon defoamer is easy to separate and adsorb or cause silicon accumulation due to poor compatibility with amine liquid, equipment scaling or foaming aggravation can be caused by long-term use, and the traditional silicon defoamer has toxic hazard to subsequent sulfur recovery catalysts. The compatibility of the conventional polyether defoamer (such as polyoxyethylene polyoxypropylene block polyether) and amine liquid is improved, but the molecular structure of the conventional polyether defoamer is fixed in hydrophilic-lipophilic balance (HLB value), and the conventional polyether defoamer is often insufficient in defoaming efficiency, durability and applicability in complex and changeable amine liquid systems (such as different amine types, different degradation degrees and multiple impurities) and is characterized by large addition amount, low defoaming speed and short foam inhibition time. In addition, the preservatives used in many existing defoamer formulations may be insufficiently environmentally friendly or adversely affect the amine liquid system itself. Therefore, developing a novel efficient amine liquid defoamer which is highly compatible with amine liquid, excellent in defoaming and foam inhibiting performance, durable in action, environment-friendly and free from influencing the main process becomes a technical problem to be solved urgently in the field. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides an amine liquid defoamer and a preparation method and application thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: The preparation method of the amine liquid defoamer comprises the following steps: S1, preparing aminated modified polyether, namely dissolving polyether polyol in absolute ethyl alcohol with the mass being 1-2 times of that of the polyether polyol, heating to 40-50 ℃ under the protection of nitrogen, stirring and dispersing for 30-60min at 200-300rpm to enable the polyether polyol to be completely dissolved, then dropwise adding an amination agent and a catalyst, heating to 80-90 ℃, carrying out heat preservation reaction for 4-6h, carrying out amination reaction to enable the hydroxyl at the tail end of the polyether polyol to be converted into amino, enhancing the compatibility of the polyether polyol with amine liquid, and then carrying out reduced pressure distillation to remove unreacted amination agent to obtain the aminated modified polyether, wherein the structural general formula is as follows: R1-(O-CH2-CH2)m-(O-CH2-CH(CH3))n-NH-R’, Wherein R 1 is C 10-C18 alkyl, m is 15-30, n is 5-15, R' is C 2H4-NH-C2H4-NH2 or C 2H4-NH-C2H4-NH-C2H4-NH2; S2, preparing fluorine-containing monomer grafted aminated modified polyether, namely adding an S1 product, fluorine-containing monomer and an organic reagent into a reaction kettle under the linkage control of a DCS automatic control program and an SIS safety automatic control program, adding a catalyst at the same time, stirring and heating to a reflux state (60-80 ℃), reacting for 4-6 hours, carrying out Michael addition reaction to enable the fluorine-containing monomer to be grafted onto an aminated modified polyether molecular chain, further improving the defoaming performance, continuously dividing water by a continuous water dividing device matched with the kettle body, monitoring the water dividing amount by a metering device, ensuring that the water dividi