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Method for directly preparing anhydrous calcium dodecyl benzene sulfonate, and product

A technology of calcium dodecylbenzenesulfonate and dodecylbenzenesulfonic acid, which is applied in the field of chemical preparation, can solve the problems of waste of resources, high viscosity of mother liquor, long filtration time, etc., so as to avoid waste of resources and reduce Contamination issues, effect of short filtration times

Pending Publication Date: 2021-10-08
无锡颐景丰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems of this preparation process are: first, it is necessary to remove the solvent methanol for solvent conversion, which is time-consuming and laborious, and a waste of resources; second, the plate-and-frame filter press method in the filtration process needs to use filter aids, which often It is easy to adsorb the product, resulting in a decrease in the product yield; third, due to the high viscosity of the mother liquor and the large amount of filter residue, repeated filtration is required, resulting in long filtration time and high energy consumption; fourth, the use of filter aids makes the waste residue excessive and the pollution is particularly large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1. In a 2 ton reactor, add 360kg of isooctyl alcohol, heat it with steam to 50°C, add 550kg of linear dodecylbenzenesulfonic acid, then add 87.3Kg of calcium carbonate, and keep stirring at 50°C for 8 hours.

[0044] Step 2, adding monoethanolamine to adjust the pH to 4.

[0045] Step 3, heating up to 100°C for dehydration until the moisture content is lower than 0.5%.

[0046] Step 4, cooling down and discharging, adopting vacuum filtration to obtain a clarified product.

[0047] In embodiment 1, finally obtain product 900kg, product yield is 95%.

Embodiment 2

[0049] Step 1. In a 2-ton reactor, add 360kg of n-butanol, heat it with steam to 70°C, add 550kg of linear dodecylbenzenesulfonic acid, then add 64.6Kg of calcium hydroxide, and keep stirring at 70°C for 5h.

[0050] Step 2, adding diethanolamine to adjust the pH to 6.

[0051] Step 3, heating up to 100 degrees and dehydrating until the moisture content is lower than 0.5%.

[0052] Step 4, then cool down and discharge, adopt vacuum filtration to obtain a clarified product.

[0053] In embodiment 2, finally obtain product 900kg, product yield is 95%.

Embodiment 3

[0055] Step 1. In a 2-ton reactor, add 460kg of solvent oil, heat it with steam to 80°C, add 550kg of branched chain dodecylbenzenesulfonic acid, then add 48.9Kg of calcium oxide, and keep stirring at 80°C for 3h.

[0056] Step 2, adding triethanolamine to adjust the pH to 7.

[0057] Step 3, heating up to 100 degrees and dehydrating until the moisture content is lower than 0.5%.

[0058] Step 4, then cool down and discharge, adopt vacuum filtration to obtain a clarified product.

[0059] In embodiment 3, finally obtain product 950Kg, product yield is 92%.

[0060] In Examples 1-3, the yield of the product is high, and the present invention does not use filter aids for multiple filtrations, so the pollution is small and the energy consumption is low.

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PUM

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Abstract

The invention relates to a method for directly preparing anhydrous calcium dodecyl benzene sulfonate with simple steps, and a product. The method comprises the following steps: step 1, reacting dodecylbenzene sulfonic acid with calcium in a solvent at a preset temperature; step 2, adjusting the pH value to 4-7; step 3, raising the temperature, and removing water; and step 4, filtering to obtain the product. The reacted mother liquor is subjected to vacuum filtration to obtain the clear and transparent product, and the method is simple and convenient in production, less in filter residue, less in pollution, economical and environment-friendly.

Description

technical field [0001] The invention relates to a method for preparing chemical substances, in particular to a method for directly preparing anhydrous calcium dodecylbenzenesulfonate with simple steps. Background technique [0002] Calcium dodecylbenzenesulfonate is an important anionic surfactant, mainly used in the preparation of pesticide emulsifiers, commonly known as Nongru No. 500. [0003] Most of the current production methods of calcium salts are to react dodecylbenzenesulfonic acid with calcium hydroxide or calcium carbonate in methanol solvent, and the obtained solution is filtered through a plate frame, dehydrated to remove the solvent and then converted into n-butanol and iso-octanol Or solvent oils to obtain the product of calcium dodecylbenzenesulfonate. [0004] The problems of this preparation process are: first, it is necessary to remove the solvent methanol for solvent conversion, which is time-consuming and laborious, and a waste of resources; second, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C303/44C07C309/31
CPCC07C303/32C07C303/44C07C309/31
Inventor 张前军万秀琴
Owner 无锡颐景丰科技有限公司
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