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Preparing method of emulsifier Span-80 for emulsion explosive

A technology of span-80, emulsion explosive, applied in non-explosive/non-thermal agent components, explosives, organic chemistry, etc., can solve the problems of high sorbitol sugar residue and carbon residue, lower production efficiency, different yields, etc. The effect of reducing sorbitol residue, increasing product volume and increasing productivity

Inactive Publication Date: 2017-01-25
JINGMEN LIAOYUAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the different synthesis processes, the quality of the produced Span-80 is different, and the yield is also different. At present, when the emulsifier Span-80 is produced, it is affected by the ratio of raw materials, resulting in the sorbitol residue and carbon produced by the reaction. There are more slag, and the yield is low at the same time, which reduces the production efficiency

Method used

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  • Preparing method of emulsifier Span-80 for emulsion explosive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 (comparative group)

[0016] The process includes the following steps:

[0017] (1) The 450kg sorbitol solution is heated to 130~140℃, free water is removed, and sorbitol is generated;

[0018] (2) The etherification reaction of sorbitol and catalyst occurs at 130-150°C under vacuum, and the reaction time is 3 hours to generate sorbitan anhydride;

[0019] (3) Raise 750kg oleic acid to 100~180℃ for refining to generate essential oleic acid;

[0020] (4) Put essential oleic acid and sorbitan anhydride into the reaction kettle with an acid alcohol molar ratio of 450:740. After adding an alkaline catalyst, first heat the reaction at 180~190℃ for 2 hours, and then keep the temperature at 210~220℃ Esterification reaction for 3 hours;

[0021] (5) Vacuum dehydration and esterification of the above-mentioned reacted materials for 1.5 hours to obtain a crude product;

[0022] (6) Move the crude product into the precipitation tank, and perform cooling and precipitation under heat...

Embodiment 2

[0024] The process includes the following steps:

[0025] (1) Raise 400kg sorbitol solution to 130~140℃ to remove free water to generate sorbitol;

[0026] (2) Under vacuum, sorbitol and catalyst will undergo etherification reaction at 130~150℃. The reaction time is 3 hours to produce sorbitan anhydride. The catalyst used is phosphoric acid and the amount of phosphoric acid added is sorbitol. 0.5% of quality;

[0027] (3) Raise 740kg of oleic acid to 100~180℃ for refining to generate essential oleic acid;

[0028] (4) Put essential oleic acid and sorbitan anhydride into the reaction kettle with an acid alcohol molar ratio of 450:740. After adding an alkaline catalyst, first heat the reaction at 180~190℃ for 2 hours, and then keep the temperature at 210~220℃ The esterification reaction is 3 hours, the basic catalyst used is sodium hydroxide, and the addition amount of the basic catalyst is 0.3% of the total mass of sorbitan anhydride and essential oleic acid;

[0029] (5) Vacuum dehydr...

Embodiment 3～ Embodiment 4

[0032] The difference between Examples 3 to 4 and Example 2 lies in the different qualities of the raw materials used, sorbitol and oleic acid, as shown in the following table.

[0033]

[0034] It can be seen from the above table that when the mass ratio of oleic acid to sorbitol is 1.85 to 1.98, the yield is the highest.

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Abstract

The preparing method of emulsifier Span-80 for emulsion explosive comprises the following steps: 1, heating the sorbitol solution to remove the free water to produce sorbitol; 2, reacting sorbitol with the catalyst to produce sorbitan; 3, refining oleic acid to produce essential oil; 4, putting the oleic acid and sorbitan anhydride into the reaction kettle, with 3 hours of esterification reaction at the temperature of 210 - 220 oC ; 5, materials from the above-mentioned reaction is conducted the vacuum dehydration and esterification to obtain the crude product; 6, the crude product is cooled and precipitated, and the sediment is released after the completion of the precipitation, and the remainder is the product of the emulsifier Span-80. Advantages of the invention:through the long-term production practice and the study,it's found that changing the molar ratio of acid to alcohol feedstock could reduce the input of raw materials, reduce the amount of sorbitol residue, increase the amount of product produced and improve the product production rate.

Description

Technical field [0001] The invention relates to a method for synthesizing an emulsifier, in particular to a preparation process of an emulsifier Span-80 for emulsion explosives. Background technique [0002] Span-80 emulsifier, the scientific name of sorbitan monooleate, is a polyhydric alcohol type nonionic surfactant, and it is the most commonly used water-in-oil type excellent emulsifier in current production. Span-80 emulsifier is formed by dehydration and etherification under the catalysis of sorbitol acid to produce sorbitan anhydride, which is then esterified with oleic acid at a high temperature of about 200-210°C and alkali catalysis in a reaction kettle. . [0003] Due to the different synthesis process, the quality of the produced Span-80 is different, and the yield is also different. At present, when the emulsifier Span-80 is produced, it is affected by the ratio of raw materials, resulting in the sorbitol sugar residue and carbon produced by the reaction. There is mo...

Claims

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Application Information

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IPC IPC(8): C07D307/20C06B23/00
CPCC07D307/20C06B23/009
Inventor 钱定安
Owner JINGMEN LIAOYUAN TECH DEV
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