Production method for sulfonic acid curing agent used for casting

A production method and curing agent technology, applied in sulfonic acid preparation, casting molding equipment, casting molds, etc., can solve the problems of unsatisfactory production efficiency and environmental protection requirements, long dehydration time, etc., achieve broad market application prospects and improve production efficiency , The effect of shortening the production man-hour

Inactive Publication Date: 2012-06-27
NINGXIA KOCEL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The dehydration time of the synthesis reaction is relatively long. Taking the 3-ton reactor in the workshop as an example, it takes 9-10 hours to achieve the dehydration amount required by the process, and produces 250kg-300kg of waste water. The production efficiency and environmental protection requirements are not ideal.

Method used

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  • Production method for sulfonic acid curing agent used for casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: a kind of production method of casting sulfonic acid curing agent is characterized in that: it comprises the following steps

[0021] a. Close the bottom valve of the kettle, turn on the vacuum pump, and inhale 5% to 8% of toluene;

[0022] b. Close the vacuum valve, open the vent valve, open the sulfuric acid feeding valve, start the mixer, and add 30% to 35% of concentrated sulfuric acid;

[0023] c. Open the steam valve, maintain the steam pressure at 0.2-0.3MPa, raise the temperature to 100-118°C within 40-50 minutes, and keep the temperature for 90 minutes;

[0024] d. Open the cooling water valve, lower the temperature to 60°C, and slowly add 20% to 30% of organic alcohol through the high-level tank;

[0025] e. After adding the organic alcohol, slowly add 30% to 40% of water through the high tank;

[0026] f. After adding water, cool down to 45°C, add 1% hydrogen peroxide aqueous solution, stir for 20 minutes and take samples for inspection.

...

Embodiment 2

[0028] Embodiment two: a kind of production method of sulfonic acid solidifying agent for foundry, it comprises the following steps: a. close the bottom valve of the tank, open the vacuum pump, inhale 5%~8% of toluene;

[0029] b. Close the vacuum valve, open the vent valve, open the sulfuric acid feeding valve, start the mixer, and add 35% to 40% of concentrated sulfuric acid;

[0030] c. Open the steam valve, maintain the steam pressure at 0.2-0.3MPa, and raise the temperature to 100°C-118°C within 40-50 minutes; keep warm for 90 minutes;

[0031] d. Open the cooling water valve, lower the temperature to 60°C, and slowly add 20% to 30% of organic alcohol through the high-level tank;

[0032] e. After adding the organic alcohol, slowly add 25% to 35% of water through the high tank;

[0033] f. After adding water, cool down to 45°C, add 1% hydrogen peroxide aqueous solution, stir for 20 minutes and take samples for inspection.

[0034] The sulfonic acid curing agent is suita...

Embodiment 3

[0035] Embodiment three: a kind of production method of casting sulfonic acid curing agent, it comprises the following steps: a. close the bottom valve of the tank, open the vacuum pump, inhale 5%~8% of toluene;

[0036] b. Close the vacuum valve, open the vent valve, open the sulfuric acid feeding valve, start the mixer, and add 40% to 50% of concentrated sulfuric acid;

[0037] c. Open the steam valve, maintain the steam pressure at 0.2-0.3MPa, raise the temperature to 100-118°C within 40-50 minutes, and keep the temperature for 90 minutes;

[0038] d. Open the cooling water valve, lower the temperature to 60°C, and slowly add 20% to 30% of organic alcohol through the high-level tank;

[0039] e. After adding the organic alcohol, slowly add 15% to 25% of water through the high tank;

[0040] f. After adding water, cool down to 45°C, add 1% hydrogen peroxide aqueous solution, stir for 20 minutes and take samples for inspection.

[0041] The sulfonic acid curing agent is su...

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Abstract

The invention relates to a production method for sulfonic acid curing agent and especially to a production method for sulfonic acid curing agent used for casting without generation of three wastes (waste gas, waste water and industrial residue). The method is characterized by comprising the following steps: a, closing a kettle bottom valve, opening a vacuum pump and taking in toluene with a desired weight; b, closing a vacuum valve, opening an air release valve and a sulfuric acid feeding valve, starting a mixer and adding concentrated sulfuric acid with a desired weight; c, opening a steam valve, maintaining steam pressure to be 0.2 to 0.3 MPa, allowing temperature to rise to 100 to 118 DEG C within 40 to 50 min and carrying out insulation for 90 min; d, opening a cooling water valve, allowing temperature to drop to 60 DEG C and slowly adding organic alcohol with a desired weight through an elevated tank; e, slowly adding water with a desired weight through the elevated tank after addition of organic alcohol is finished; and f, after addition of water is finished, allowing temperature to drop to 45 DEG C, adding an aqueous hydrogen peroxide solution with a desired weight, carrying out stirring for 20 min and carrying out inspection by sampling. According to the invention, control of total acidity of the curing agent and free acid is realized, production efficiency is effectively improved, and no discharge of industrial three wastes is realized.

Description

technical field [0001] The present invention relates to a production method of a sulfonic acid curing agent, in particular to a production method of a sulfonic acid curing agent for foundry that does not produce three wastes. Background technique [0002] At present, the commonly used sulfonic acid curing agent for furan resin in the industry is p-toluenesulfonic acid aqueous solution. It is produced by sulfonation, detoluene, transposition crystallization and separation of toluene under the action of a catalyst. During sulfonation, it mainly generates ortho- and para-position substitutions. The reaction formula is: [0003] [0004] The dehydration time of the synthesis reaction is relatively long. Taking the 3-ton reactor in the workshop as an example, it takes 9-10 hours to achieve the dehydration amount required by the process, and 250kg-300kg of waste water is generated. The production efficiency and environmental protection requirements are not ideal. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/06C07C309/30B22C1/10
Inventor 靳毅韩文杨洋何龙
Owner NINGXIA KOCEL GRP CO LTD
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