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Clean production method of a dispersing agent
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A clean production and dispersant technology, applied in dyeing, sulfonic acid preparation, organic chemistry, etc., can solve the problem of low sodium sulfate content, achieve low sodium sulfate content, light staining performance, and good heat resistance stability Effect
Inactive Publication Date: 2020-09-22
浙江五龙新材股份有限公司
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[0005] In the dispersant process for the synthesis of single methylnaphthalene, use a large amount of lime to remove excess sulfuric acid and produce the technical problem of environmentally unfavorable calciumsulfateslag. The purpose of this invention is to provide a method for the clean production of dispersant. Methods Add phenolsulfonic acid and p-aminobenzenesulfonic acid substances during the condensation process, and only neutralize them with alkaline substances such as potassiumhydroxide, without producing calcium sulfate slag that is harmful to the environment; the obtained dispersant has good resistance Heat stability, light polyester / cotton staining performance, low sodium sulfate content in the product, almost no calcium and magnesium ions
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Embodiment 1
[0022] Step 1) Sulfonation reaction: put 50g of methylnaphthalene into the reactor, heat up to 90°C, add 50g of concentrated sulfuric acid dropwise, heat up to 130°C for 7 hours, and the reaction ends;
[0023] Step 2) Hydrolysis reaction: cool down to 120°C, add 60g of water for hydrolysis, and stir for 30 minutes;
[0024] Step 3) Condensation reaction: Add 25g of sulfonated phenol, add 25g of p-aminobenzenesulfonic acid, continue to cool down to 95°C, add dropwise 60g of formaldehyde, heat up to 95°C, and react at 95°C for 18 hours;
[0027] Step 1) Sulfonation reaction: put 40g of methylnaphthalene into the reactor, heat up to 90°C, add 40g of concentrated sulfuric acid dropwise, heat up to 130°C for 7 hours, and the reaction ends;
[0028] Step 2) Hydrolysis reaction: cool down to 120°C, add 60g of water for hydrolysis, and stir for 30 minutes;
[0029] Step 3) Condensation reaction: Add 30g of sulfonated phenol, add 30g of p-aminobenzenesulfonic acid, continue to cool down to 95°C, add 60g of formaldehyde dropwise, heat up to 95°C, and react at 95°C for 18 hours;
[0032] Step 1) Sulfonation reaction: put 35g of methylnaphthalene into the reactor, heat up to 90°C, add 35g of concentrated sulfuric acid dropwise, heat up to 130°C for 7 hours, and the reaction ends;
[0033] Step 2) Hydrolysis reaction: cool down to 120°C, add 60g of water for hydrolysis, and stir for 30 minutes;
[0034] Step 3) Condensation reaction: Add 30g of sulfonated phenol, add 35g of p-aminobenzenesulfonic acid, continue to cool down to 95°C, add dropwise 60g of formaldehyde, heat up to 95°C, and react at 95°C for 18 hours;
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Abstract
The invention relates to a clean production method of a dispersing agent, which comprises the following steps: 1) sulfonation reaction: putting a methylnaphthalene compound into a reactor, adding a sulfonating agent, and heating for sulfonation; 2) hydrolysis reaction: adding water into a product obtained in the sulfonation reaction in the step 1) in proportion for hydrolysis; 3) condensation reaction: adding phenolsulfonic acid and sulfanilic acid into a product obtained after the hydrolysis reaction in the step 2), then adding an aldehyde compound, and heating for reaction; 4) neutralizationreaction: adjusting the pH value of the product after the condensation reaction in the step 3) to be neutral by using an alkaline compound to obtain a product. In the neutralization process, comparedwith a traditional dispersing agent product, lime is not adopted for neutralization, and calciumsulfateslag harmful to the environment is not generated at all. The dispersing agent obtained by themethod has good heat-resistant stability and light polyester / cotton staining performance, the content of sodiumsulfate in the product is low, and the product hardly contains calcium and magnesium ions.
Description
technical field [0001] The invention relates to the technical field of dye dispersants, and relates to a method for clean production of dispersants. Background technique [0002] Dye is a substance that can color fibers and other materials. It should have the characteristics of heat resistance, stability, resistance to decolorization, discoloration, no pollution, and uniform dyeing. In order to disperse the dye evenly, it is often necessary to add an auxiliary agent to it. It is an additive that can improve and improve the dispersibility of solid or liquid materials, and can increase the solubility of dyes to improve the printing and dyeing effect. [0003] Dye dispersant is the main auxiliary agent in the process of dye processing. It is a kind of additive with large quantity and wide range and rapid development. It has two kinds of groups, which are lipophilic and hydrophilic, and is a kind of surfactant. The main product of dye dispersant is (methyl)sulfonic acid formal...
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