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Technology for preparing anhydrous calcium dodecyl benzene sulfonate

A technology of calcium dodecylbenzenesulfonate and dodecylbenzenesulfonic acid, which is applied in the field of preparing anhydrous calcium dodecylbenzenesulfonate, can solve problems such as low production efficiency and unreasonable proportioning, and achieve The effect of low cost, reasonable ratio and unified benchmark

Inactive Publication Date: 2017-05-17
南通德益化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the ratio of many preparations is unreasonable, and the production efficiency is low

Method used

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Embodiment Construction

[0016] The invention discloses a process for preparing anhydrous calcium dodecylbenzenesulfonate, which comprises the following steps:

[0017] (1) Dodecylbenzenesulfonic acid is mixed with 10%-30% water by mass percentage and 2-4 times its weight of solvent and water-carrying agent, and the mass percentage at a temperature of 40-50°C is React in 11%-17% neutralizing agent for 0.5-2.0 hours. The neutralizing agent can be calcium hydroxide, calcium oxide, calcium carbonate; the pH value is 7.0-8.0;

[0018] (2) Heat up to 60-100°C, add 5-30% diluent by mass, keep warm for 10-60 minutes, add 5-6% demulsifier by mass, and stir for 5-30 minutes;

[0019] (3) Extract the emulsion into a storage tank, keep it warm at 60-95°C, let it stand for 5-6 hours, and separate the water and emulsion;

[0020] (4) Use the extraction method to suck the clear liquid into the still, and remove the water and excess solvent and water-carrying agent under normal pressure or reduced pressure;

[002...

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PUM

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Abstract

The invention relates to a technology for preparing anhydrous calcium dodecyl benzene sulfonate. The technology comprises the following steps: mixing dodecylbenzene sulfonic acid, 10-30% by mass of water and a medium comprising water and a water carrying agent, with the weight 2-4 times the weight of dodecylbenzene sulfonic acid, and carrying out a reaction in a neutralizer with the temperature of 40-50 DEG C and the mass percentage of 11-17% for 0.5-2.0 h to make the pH value reach 7.0-8.0; heating the obtained solution to 60-100 DEG C, adding 5-30% by mass of a diluent, keeping the temperature for 10-60 min, adding 5-6% by mass of a de-emulsifier, and stirring all above substances for 5-30 min; extracting obtained emulsion to a storage tank, keeping the temperature in a range of 60-95 DEG C, and standing the emulsion for 5-6 h in order to realize water and emulsion layering; and sucking obtained clear liquid to a distillation kettle through an extraction method, and removing water and excess solvent and water carrying agent under normal pressure or a reduced pressure. The technology adopts a reasonable ratio of all preparations, and rapidly and highly-effectively realizes production on the premise of guaranteeing the quality.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a process for preparing anhydrous calcium dodecylbenzenesulfonate. Background technique [0002] Calcium dodecylbenzenesulfonate is an anionic surfactant (commonly known as 500# calcium salt in the pesticide industry, hereinafter referred to as 500#), and it is one of the two main raw materials for emulsifiers used in compounding pesticides. Its dosage can account for 10-60% of the pesticide emulsifier. [0003] A new process for preparing anhydrous calcium dodecylbenzenesulfonate by demulsifier method. It adopts the method of adding demulsifier, heat preservation and standing, so that 90-95% of the emulsion is clear and transparent. method, it is extracted, without filtering, it can be directly distilled, dehydrated, and excess solvent is removed. The remaining 5-10% precipitates with impurities such as excessive neutralizers can be concentrated for treatment. In the exist...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C309/31
CPCC07C303/32
Inventor 贾庆山马海兵
Owner 南通德益化工有限公司
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