Method for preparing sodium soap

A technology of sodium soap and saponification, which is applied in the field of preparing sodium soap, which can solve the problems of insufficient utilization, a large amount of alkali-containing wastewater, and cumbersome production steps, and achieve the effects of low loss, less impurities, and simple equipment

Active Publication Date: 2013-09-25
邓爱梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is more widely used in the industrial production of sodium soap, the consumption of alkali is large in the production process, and cannot be fully utilized, and a large amount of alkali-containing waste water is produced after the reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Example 1: the production of soybean oil sodium soap

[0018] Dissolve 100g of soybean oil in 400g of 95% ethanol, place the reactor containing the solution in a salt bath at 170°C, stir rapidly, and slowly add 21.5g of sodium hydroxide powder after the solution boils, and continue the reaction until hydrogen The sodium oxide was completely dissolved, and the soybean oil was completely reacted. Leave the solution to cool down at low temperature, and white flocculent solids will slowly precipitate out. When the temperature of the solution drops to 5°C, no more solids will precipitate out. Filter with suction, and dry the filter cake in an oven at 60°C for 2-3 hours to obtain sodium soap. Product, the filtrate is an ethanol solution of glycerin and unsaponifiable matter, and the ethanol can be recycled after distillation. Product soap quality is 109.4g, and productive rate is 90%. The free caustic content in sodium soap is determined by QB / T2623.1-2003 standard to be 0....

example 2

[0019] Example 2: the production of rapeseed oil sodium soap

[0020] Dissolve 100g of rapeseed oil in 350g of absolute ethanol, place the reactor containing the solution in a salt bath at 160°C, stir rapidly, and slowly add 23.5g of sodium hydroxide powder after the solution boils, and continue the reaction until The sodium hydroxide was completely dissolved, and the soybean oil was completely reacted. Leave the solution to cool down at low temperature, white flocculent solids slowly precipitate out, when the temperature of the solution drops to 0°C, no more solids precipitate out, filter with suction, and dry the filter cake in an oven at 60°C for 2-3 hours to obtain the product soap , the filtrate is an ethanol solution of glycerin and unsaponifiable matter, and the ethanol can be recycled after distillation. Product soap quality is 89.5g, and productive rate is 72.5%. The free caustic content in sodium soap is determined by QB / T2623.1-2003 standard to be 0.131%, which me...

example 3

[0021] Example 3: the production of tallow oil sodium soap

[0022] Dissolve 100g of tallow tree oil in 500g of anhydrous methanol, place the reactor containing the solution in a salt bath at 180°C, stir rapidly, and slowly add 23g of sodium hydroxide powder after the solution boils, and continue the reaction until the hydroxide is oxidized The sodium is all dissolved, and the tallow oil is completely reacted. Leave the solution to cool down at low temperature, white flocculent solids slowly precipitate out, when the temperature of the solution drops to 0°C, no more solids precipitate out, filter with suction, and dry the filter cake in an oven at 60°C for 2-3 hours to obtain the product soap , the filtrate is a methanol solution of glycerol and unsaponifiable matter, and methanol can be recycled after distillation. Product soap quality is 93.5g, and productive rate is 76%. The free caustic content in sodium soap is determined by QB / T2623.1-2003 standard to be 0.148%, which ...

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PUM

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Abstract

The invention relates to a method for preparing sodium soap. The method comprises the following steps of: dissolving grease in an organic solvent of which the mass is 1-5 times of that of the grease, putting the mixed liquid into a batch reactor with a condensing and refluxing device in the absence of water, heating the mixed liquid to 120-200 DEG C until the mixed liquid is boiling, slowly adding powdery solid sodium hydroxide of which the mass is 0.1-0.5 times of that of the grease, fiercely stirring for saponification, so as to obtain sodium soap, glycerin, unsaponifiable matters and residual alkali; after the reaction is ended, cooling products at -10-20 DEG C, separating the sodium soap out of the solution, filtering out the organic solvent in a suction manner, and drying a filter cake in a drying oven at 30-80 DEG C, so as to obtain a sodium soap product mixed with a small amount of residual alkali, wherein the alkali content is lower than national standards; and dissolving the glycerin and the unsaponifiable matters into the organic solvent, and circularly utilizing the organic solvent after distilling the organic solvent. The method disclosed by the invention is simple, efficient and environment-friendly, is low in use amount of solid alkali and applicable to preparation of the sodium soap of various oil products; the obtained product is high in yield, contents less free caustic alkali and few impurities and is pure white in color; and the disadvantages of complex operation, low product yield and high impurity content in the product in the conventional sodium soap preparation process are overcome.

Description

technical field [0001] The invention relates to the field of sodium soap, in particular to a method for preparing sodium soap. Background technique [0002] Sodium soap is an indispensable raw material in daily life and chemical production, and has a wide demand and good economic benefits, so the optimal production of sodium soap is a subject that can be developed. [0003] The traditional sodium soap production process is saponification reaction of oil and metal hydroxide aqueous solution, after repeated salting out, washing with water, filtration and drying to obtain sodium soap products. Although this method is more widely used in the industrial production of sodium soap, the consumption of alkali is large in the production process, and cannot be fully utilized, and a large amount of alkali-containing waste water is produced after the reaction finishes, causing environmental pollution; the production steps are loaded down with trivial details, A large amount of sodium ch...

Claims

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Application Information

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IPC IPC(8): C07C27/02C11D9/02
Inventor 于凤文王玮瑾李雨臻计建炳臧亚磊
Owner 邓爱梅
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