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Method for coproduction of dispersants MF and sodium sulphite

A sodium sulfite and dispersant technology, applied in the field of preparation of sulfonated dispersants, can solve the problems of complex process, large equipment investment, high cost, etc., and achieve the effects of simple process, low energy consumption, and low content of calcium and magnesium ions

Active Publication Date: 2009-03-04
ZHEJIANG RUNTU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use recycled materials to adjust the acidity, and to recover the organic solvent, the process is more complicated, and the organic solvent is not completely inert, it will consume a certain amount of sulfonating agent, generate a certain amount of harmful by-products, which are difficult to separate, thus affecting the product quality
The Chinese invention patent with the publication number CN1043637 uses sulfur dioxide as a solvent, sulfonates it with sulfur trioxide, and then recovers the solvent sulfur dioxide and removes the residual sulfur dioxide with nitrogen. At the same time, there will be more residual sulfur dioxide in the sulfonated product, which will affect the quality of the product and the environment, and the equipment investment will be large and the cost will be high.

Method used

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  • Method for coproduction of dispersants MF and sodium sulphite
  • Method for coproduction of dispersants MF and sodium sulphite
  • Method for coproduction of dispersants MF and sodium sulphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 60g of industrial methylnaphthalene into the reaction vessel, add 23g of 98% concentrated sulfuric acid, stir evenly, then slowly pass in about 25g of sulfur trioxide gas, control the reaction temperature at 50-60°C, and control the passage time at 1-2 Hours, pass through, heat preservation reaction for 1 hour, heat up to 150°C, vacuumize, control the vacuum degree at about 0.025Mpa, react at this temperature for 3 hours, then take samples to measure the acid value, after the acidity is qualified, cool down to 110°C, Add a certain amount of water to adjust the condensation acidity to 18%, then lower the temperature to 70°C and add 27g of formaldehyde solution (general concentration is 36% to 38%), heat up to 110°C and pressurize for 5 hours, then lower the temperature and pressure, add water to dilute , add sodium hydroxide to adjust the pH value to neutral, and obtain the aqueous solution of dispersant MF, and dry it to obtain solid powder MF.

[0022] The sulfur d...

Embodiment 2

[0024] Put 60g of washing oil into the reaction container, add 24g of 98% concentrated sulfuric acid, stir evenly, then slowly feed about 26g of sulfur trioxide gas, control the reaction temperature at 70-80°C, and control the feeding time at 2-3 hours, After passing through, keep warm for 1 hour, start to heat up to 140°C, vacuumize, control the vacuum degree at about 0.02Mpa, react at this temperature for 3 hours, then take samples to measure the acid value, after the acidity is qualified, cool down to 100°C, add certain amount of water, adjust the condensation acidity to 20%, then lower the temperature to 70°C, add 26g of formaldehyde solution (general concentration is 36%~38%), raise the temperature to 110°C and pressurize for 5 hours, then lower the temperature and reduce the pressure, add water to dilute, add Adjust the pH value to neutral with sodium hydroxide to obtain the aqueous solution of dispersant MF, and dry it to obtain solid powder MF.

[0025] The sulfur diox...

Embodiment 3

[0027] Put 60g of industrial methylnaphthalene into the reaction vessel, add 24g of 98% concentrated sulfuric acid, stir evenly, then slowly pass in about 24g of sulfur trioxide gas, control the reaction temperature at 80-90°C, and control the passage time at 2-3 Hours, pass through, heat preservation reaction for 1 hour, start to heat up to 145°C, vacuumize, control the vacuum degree at about 0.03Mpa, react at this temperature for 3 hours, then take samples to measure the acid value, after the acidity is qualified, cool down to 110°C, Add a certain amount of water to adjust the condensation acidity to 15%, then lower the temperature to 70°C and add 28g of formaldehyde solution (general concentration is 36% to 38%), heat up to 110°C and pressurize for 5 hours, then lower the temperature and pressure, add water to dilute , add sodium hydroxide to adjust the pH value to neutral, and obtain the aqueous solution of dispersant MF, and dry it to obtain solid powder MF.

[0028] The ...

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Abstract

The invention discloses a method for preparing dispersant MF in combination with sodium sulfite. The method comprises the following steps: adding more than 95% of sulfuric acid to the methylnaphthalene raw material, charging sulfur trioxide to carry out sulfonation reaction thoroughly, heating, evacuating, and continuously reacting to reach the total acidity of the solution of 22-27%; absorbing sulfur dioxide gas generated by sulfonation reaction with alkali liquor for preparing sodium sulfite; and regulating condensation acidity to 14% to 20% with water, adding formaldehyde aqueous solution for condensation, diluting, and regulating pH to 7 with alkali to obtain dispersant MF. In the method, lime is not required to neutralize so that solid waste such as calcium sulfate can not be generated and the dispersant MF reaches Chinese quality standard GB9294-88. Meanwhile, sulfur oxide waste gas is reasonably reutilized, with the characteristic of low energy consumption; and is a clean environment friendly production process.

Description

technical field [0001] The invention relates to a method for preparing a sulfonated dispersant, in particular to a method for producing the dispersant MF and simultaneously producing sodium sulfite. Background technique [0002] Dispersant MF is the most commonly used dye dispersant for disperse dyes and vat dyes in the world. It is popular because of its good dispersing effect and low price. [0003] The usual production process of dispersant MF is to use industrial methylnaphthalene (methylnaphthalene content above 60%) or washing oil (methylnaphthalene content above 25%) to sulfonate with concentrated sulfuric acid, then condense with formaldehyde aqueous solution, and then Use lime to neutralize the residual sulfuric acid, make alkali through sodium hydroxide, and then filter off solid waste such as calcium sulfate to obtain an aqueous solution of methylnaphthalenesulfonic acid formaldehyde condensate, that is, dispersant MF. [0004] The existing technology usually use...

Claims

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Application Information

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IPC IPC(8): C07C309/28C07C309/62C07C303/06C01D5/14
Inventor 赵国生阮华林童吉庆阮海兴赵伟明陈田木
Owner ZHEJIANG RUNTU
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