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Purification method of 2-acrylamido-2-methallyl sulfonic acid monomer

A technology of methacrylic sulfonic acid and sodium methacrylic sulfonate, which is applied in chemical instruments and methods, sulfonate preparation, organic chemistry, etc., and can solve the problems of cumbersome treatment process, large amount of polymerization inhibitor, stability impact, etc. problem, to achieve the effect of less process investment and lower production cost

Pending Publication Date: 2022-07-22
寿光市荣晟新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] (1) Using methanol or ethanol or deionized water as a solvent, 2-acrylamido-2-methacrylamide has different solubility in different solvents at different temperatures, and precipitates to achieve the purpose of purification, but this method, The amount of polymerization inhibitor is large, and among these three solvents, 2-acrylamido-2-methylpropenesulfonic acid has poor high temperature stability and is easy to lose double bonds, which affects the stability of production and is not conducive to the stability of production operate;
[0011] (2) 2-acrylamido-2-methylpropenesulfonic acid has good stability when the water content of acetic acid is 5%-10% (mass fraction). Also, it can be separated and purified according to different temperatures and solubility. Amido-2-methylpropenesulfonic acid is currently used by many manufacturers, but the disadvantages are more investment in equipment, cumbersome treatment process and higher energy consumption

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  • Purification method of 2-acrylamido-2-methallyl sulfonic acid monomer
  • Purification method of 2-acrylamido-2-methallyl sulfonic acid monomer
  • Purification method of 2-acrylamido-2-methallyl sulfonic acid monomer

Examples

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Effect test

Embodiment 1

[0033] A method for purifying 2-acrylamido-2-methacrylic sulfonic acid monomer, specifically:

[0034] 1. Pretreatment: add unpurified 2-acrylamido-2-methylpropenesulfonic acid monomer to acetone, then add sodium iodide to acetone, stir at a stirring speed of 300rpm for 30min, filter, and put the filter residue in drying at 60°C to obtain 2-acrylamido-2-methylpropenesulfonic acid after primary treatment;

[0035] In the unpurified 2-acrylamido-2-methacrylsulfonic acid, the mass fraction of 2-acrylamido-2-methacrylsulfonic acid was 95.5%, the mass fraction of acrylamide was 1.8%, and the N- The mass fraction of tert-butylacrylamide is 1.1%, the mass fraction of propylamine is 0.4%, the mass fraction of methallyl sulfonic acid is 0.22%, and the dimerization of 2-acrylamido-2-methacrylsulfonic acid The mass fraction of body (or trimer) is 0.04%, and the content of polymerization inhibitor is 30PPM;

[0036] The weight ratio of the unpurified 2-acrylamido-2-methylpropenesulfonic...

Embodiment 2

[0051] A method for purifying 2-acrylamido-2-methacrylic sulfonic acid monomer, specifically:

[0052] 1. Pretreatment: add the unpurified 2-acrylamido-2-methylpropenesulfonic acid monomer into acetone, then add sodium iodide to the acetone, stir at a stirring speed of 310rpm for 32min, filter, and put the filter residue in Drying at 62°C to obtain 2-acrylamido-2-methylpropenesulfonic acid after primary treatment;

[0053] In the unpurified 2-acrylamido-2-methacrylsulfonic acid, the mass fraction of 2-acrylamido-2-methacrylsulfonic acid is 96%, the mass fraction of acrylamide is 2%, and the N- The mass fraction of tert-butylacrylamide is 1.2%, the mass fraction of propylamine is 0.5%, the mass fraction of methallyl sulfonic acid is 0.24%, and the dimerization of 2-acrylamido-2-methacrylic acid The mass fraction of the body (or trimer) is 0.05%, and the content of the polymerization inhibitor is 35PPM;

[0054] The weight ratio of the unpurified 2-acrylamido-2-methylpropenesu...

Embodiment 3

[0069] A method for purifying 2-acrylamido-2-methacrylic sulfonic acid monomer, specifically:

[0070] 1. Pretreatment: Add unpurified 2-acrylamido-2-methylpropenesulfonic acid monomer to acetone, then add sodium iodide to acetone, stir at a stirring speed of 320 rpm for 35 minutes, and filter, and put the filter residue in drying at 65°C to obtain 2-acrylamido-2-methylpropenesulfonic acid after primary treatment;

[0071] The mass fraction of 2-acrylamido-2-methylpropenesulfonic acid in the unpurified 2-acrylamido-2-methylpropenesulfonic acid is 96.5%, the mass fraction of acrylamide is 2.2%, and the N- The mass fraction of tert-butylacrylamide is 1.3%, the mass fraction of propylamine is 0.6%, the mass fraction of methallyl sulfonic acid is 0.26%, and the dimerization of 2-acrylamido-2-methacrylic acid The mass fraction of the body (or trimer) is 0.06%, and the content of the polymerization inhibitor is 40PPM;

[0072] The weight ratio of the unpurified 2-acrylamido-2-meth...

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Abstract

The invention discloses a method for purifying a 2-acrylamido-2-methallyl sulfonic acid monomer, which belongs to the technical field of separation and purification of organic matters and comprises the steps of pretreatment, conversion and post-treatment. The conversion comprises the following steps: slowly adding the primarily treated 2-acrylamido-2-methallyl sulfonic acid into a synthesis kettle filled with a 38-42% sodium hydroxide aqueous solution to obtain a mixed material, then adding hydroquinone and a stabilizer into the mixed material, cooling to 9-10 DEG C after 1-1.2 hours, separating out 2-acrylamido-2-methallyl sulfonic acid sodium salt at the moment, and then adding the hydroquinone and the stabilizer into the synthesis kettle to obtain the 2-acrylamido-2-methallyl sulfonic acid sodium salt. Filtering to obtain a filtered mother solution and a solid sodium salt, and carrying out vacuum drying at 110-120 DEG C to obtain a high-quality 2-acrylamido-2-sodium methallyl sulfonate product; according to the monomer purification method disclosed by the invention, the purification process can be simplified, and meanwhile, the influence on the production stability of 2-acrylamido-2-methallyl sulfonic acid is reduced.

Description

technical field [0001] The invention belongs to the technical field of organic matter separation and purification, in particular to a method for purifying 2-acrylamido-2-methacrylsulfonic acid monomer. Background technique [0002] 2-Acrylamido-2-methylpropenesulfonic acid is a vinyl monomer with a sulfonic acid group, molecular formula C7H13NO4S, has good stability, the decomposition temperature is 210 ° C, the decomposition temperature of its sodium salt is 329 ° C, The decomposition rate in the aqueous solution is slow, and the sodium salt solution has excellent water resistance under the condition of high pH value. Under the acidic condition, the hydrolysis resistance of the copolymer is much higher than that of polyacrylamide. [0003] In addition, 2-acrylamido-2-methacrylsulfonic acid is a multifunctional water-soluble anionic monomer, which is easy to self-polymerize and copolymerize with other olefin monomers, 2-acrylamido-2-methacrylsulfonic acid Acid copolymers ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/44C07C303/32C07C309/15
CPCC07C303/44C07C303/32C07C309/15
Inventor 李金磊单保卿
Owner 寿光市荣晟新材料有限公司
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