Process for preparing alkylphenol formaldehyde oligomer sulfonate

Abstract

The invention discloses a process for preparing alkylphenol formaldehyde oligomer sulfonate. The process comprises the following steps of: adding alkylphenol and a catalyst into a reaction kettle, heating with stirring, dripping a formaldehyde solution or paraformaldehyde, continuously stirring, and raising temperature to reaction temperature, adding residual formaldehyde solution or paraformaldehyde, continuously reacting, and after reaction is finished, adding a sodium hydroxide aqueous solution to adjust pH of a reaction product to be 6.5 to 8.0 to obtain alkylphenol formaldehyde oligomer; and adding the alkylphenol formaldehyde oligomer into the reaction kettle, adding a solvent to dissolve, opening a stirrer, stirring and heating to 30 to 80 DEG C, adding a sulfonating agent, continuously reacting for 30 to 90 minutes, neutralizing a sulfonating product by using alkali until pH is 7 to 8, and evaporating to remove the solvent to obtain the alkylphenol formaldehyde oligomer sulfonate. The process has the advantages that alkylphenol and formaldehyde are used as raw materials, the process is simple, and industrialization is easy to realize.

Description

technical field [0001] The invention relates to a process for preparing alkylphenol formaldehyde oligomer sulfonate by reacting alkylphenol with formaldehyde. Background technique [0002] Oligomeric surfactants are two or more common single-chain surfactant molecules that are linked together by chemical bonds with a spacer group at or near the hydrophilic group. Those with two, three, or four amphiphilic components in the molecule are called oligomeric surfactants such as dimeric, trimeric, and tetrameric, respectively. Compared with traditional surfactants, oligomeric surfactants have lower critical micelle concentration, richer aggregation behavior and better properties, especially in tertiary oil recovery. [0003] At present, the research on oligomeric surfactants at home and abroad mainly focuses on dimeric surfactants, and the research on trimeric, tetrameric, pentameric surfactants with a slightly higher degree of polymerization mainly focuses on cationic or nonioni...

AI Technical Summary

Problems solved by technology

If sulfuric acid is used as a catalyst, because its dehydration is too strong, the condensation polymer will lose its active -OH group due to intramolecular dehydration, thus losing the ability of crosslinking reaction

In addition, inorganic acid catalysts such as hydrochloric acid and sulfuric acid all have the defects of corroding equipment and polluting the environment

[0009] 3. For organic acid catalysts such as oxalic acid, because of its weak acidity, the reaction between nonylphenol and formaldehyde is mild, takes a long time, and consumes a lot of energy

[0010] 4. For solid acid catalysts, the preparation process requires high-temperature calcination, which consumes time and energy

[0011] 5. The above reports are polycondensation first and then decompression to remove water. There are many process steps, large equipment investment, long reaction time and low yield.

The solvent and water are removed by vacuuming, the viscosity of the system increases, and post-processing is troublesome

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